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  Subjects -> BIOLOGY (Total: 3153 journals)
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BIOLOGY (1504 journals)                  1 2 3 4 5 6 7 8 | Last

Showing 1 - 200 of 1720 Journals sorted alphabetically
AAPS Journal     Hybrid Journal   (Followers: 22)
Achievements in the Life Sciences     Open Access   (Followers: 5)
ACS Synthetic Biology     Hybrid Journal   (Followers: 25)
Acta Biologica Colombiana     Open Access   (Followers: 7)
Acta Biologica Hungarica     Full-text available via subscription   (Followers: 4)
Acta Biologica Sibirica     Open Access   (Followers: 1)
Acta Biomaterialia     Hybrid Journal   (Followers: 27)
Acta Biotheoretica     Hybrid Journal   (Followers: 4)
Acta Chiropterologica     Full-text available via subscription   (Followers: 6)
acta ethologica     Hybrid Journal   (Followers: 4)
Acta Fytotechnica et Zootechnica     Open Access   (Followers: 1)
Acta Limnologica Brasiliensia     Open Access   (Followers: 3)
Acta Médica Costarricense     Open Access   (Followers: 2)
Acta Musei Silesiae, Scientiae Naturales     Open Access  
Acta Neurobiologiae Experimentalis     Open Access  
Acta Parasitologica     Hybrid Journal   (Followers: 10)
Acta Scientiarum. Biological Sciences     Open Access   (Followers: 2)
Acta Scientifica Naturalis     Open Access   (Followers: 3)
Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis     Open Access  
Actualidades Biológicas     Open Access   (Followers: 1)
Advanced Health Care Technologies     Open Access   (Followers: 4)
Advanced Journal of Graduate Research     Open Access  
Advanced Studies in Biology     Open Access  
Advances in Antiviral Drug Design     Full-text available via subscription   (Followers: 2)
Advances in Bioinformatics     Open Access   (Followers: 17)
Advances in Biological Regulation     Hybrid Journal   (Followers: 4)
Advances in Biology     Open Access   (Followers: 9)
Advances in Biosensors and Bioelectronics     Open Access   (Followers: 7)
Advances in Cell Biology/ Medical Journal of Cell Biology     Open Access   (Followers: 25)
Advances in Cellular and Molecular Biology of Membranes and Organelles     Full-text available via subscription   (Followers: 12)
Advances in Developmental Biology     Full-text available via subscription   (Followers: 12)
Advances in DNA Sequence-Specific Agents     Full-text available via subscription   (Followers: 5)
Advances in Ecological Research     Full-text available via subscription   (Followers: 44)
Advances in Environmental Sciences - International Journal of the Bioflux Society     Open Access   (Followers: 17)
Advances in Enzyme Research     Open Access   (Followers: 10)
Advances in Experimental Biology     Full-text available via subscription   (Followers: 7)
Advances in Genome Biology     Full-text available via subscription   (Followers: 8)
Advances in High Energy Physics     Open Access   (Followers: 19)
Advances in Human Biology     Open Access   (Followers: 3)
Advances in Life Science and Technology     Open Access   (Followers: 16)
Advances in Life Sciences     Open Access   (Followers: 6)
Advances in Marine Biology     Full-text available via subscription   (Followers: 17)
Advances in Molecular and Cell Biology     Full-text available via subscription   (Followers: 22)
Advances in Organ Biology     Full-text available via subscription   (Followers: 1)
Advances in Planar Lipid Bilayers and Liposomes     Full-text available via subscription   (Followers: 3)
Advances in Regenerative Biology     Open Access   (Followers: 1)
Advances in Space Biology and Medicine     Full-text available via subscription   (Followers: 6)
Advances in Structural Biology     Full-text available via subscription   (Followers: 5)
Advances in Virus Research     Full-text available via subscription   (Followers: 5)
African Journal of Range & Forage Science     Hybrid Journal   (Followers: 6)
AFRREV STECH : An International Journal of Science and Technology     Open Access   (Followers: 1)
Ageing Research Reviews     Hybrid Journal   (Followers: 11)
Aging Cell     Open Access   (Followers: 16)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Agrokreatif Jurnal Ilmiah Pengabdian kepada Masyarakat     Open Access  
AJP Cell Physiology     Hybrid Journal   (Followers: 15)
AJP Endocrinology and Metabolism     Hybrid Journal   (Followers: 24)
AJP Lung Cellular and Molecular Physiology     Hybrid Journal   (Followers: 3)
Al-Kauniyah : Jurnal Biologi     Open Access  
Alasbimn Journal     Open Access   (Followers: 1)
Alces : A Journal Devoted to the Biology and Management of Moose     Open Access  
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Biology Teacher     Full-text available via subscription   (Followers: 14)
American Fern Journal     Full-text available via subscription   (Followers: 1)
American Journal of Agricultural and Biological Sciences     Open Access   (Followers: 8)
American Journal of Bioethics     Hybrid Journal   (Followers: 12)
American Journal of Human Biology     Hybrid Journal   (Followers: 14)
American Journal of Medical and Biological Research     Open Access   (Followers: 8)
American Journal of Plant Sciences     Open Access   (Followers: 19)
American Journal of Primatology     Hybrid Journal   (Followers: 15)
American Malacological Bulletin     Full-text available via subscription   (Followers: 3)
American Naturalist     Full-text available via subscription   (Followers: 74)
Amphibia-Reptilia     Hybrid Journal   (Followers: 6)
Anadolu University Journal of Science and Technology : C Life Sciences and Biotechnology     Open Access  
Anaerobe     Hybrid Journal   (Followers: 4)
Analytical Methods     Full-text available via subscription   (Followers: 11)
Anatomical Science International     Hybrid Journal   (Followers: 3)
Animal Cells and Systems     Hybrid Journal   (Followers: 4)
Animal Models and Experimental Medicine     Open Access  
Annales de Limnologie - International Journal of Limnology     Hybrid Journal   (Followers: 1)
Annales françaises d'Oto-rhino-laryngologie et de Pathologie Cervico-faciale     Full-text available via subscription   (Followers: 3)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3)
Annals of Applied Biology     Hybrid Journal   (Followers: 7)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 18)
Annals of Human Biology     Hybrid Journal   (Followers: 5)
Annals of Science and Technology     Open Access  
Annual Review of Biomedical Engineering     Full-text available via subscription   (Followers: 14)
Annual Review of Biophysics     Full-text available via subscription   (Followers: 23)
Annual Review of Cancer Biology     Full-text available via subscription   (Followers: 2)
Annual Review of Cell and Developmental Biology     Full-text available via subscription   (Followers: 37)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Annual Review of Genomics and Human Genetics     Full-text available via subscription   (Followers: 23)
Annual Review of Phytopathology     Full-text available via subscription   (Followers: 12)
Anthropological Review     Open Access   (Followers: 23)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antibiotics     Open Access   (Followers: 9)
Antioxidants     Open Access   (Followers: 4)
Antioxidants & Redox Signaling     Hybrid Journal   (Followers: 8)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5)
Anzeiger für Schädlingskunde     Hybrid Journal   (Followers: 1)
Apidologie     Hybrid Journal   (Followers: 4)
Apmis     Hybrid Journal   (Followers: 1)
APOPTOSIS     Hybrid Journal   (Followers: 8)
Applied Bionics and Biomechanics     Open Access   (Followers: 8)
Applied Vegetation Science     Full-text available via subscription   (Followers: 10)
Aquaculture Environment Interactions     Open Access   (Followers: 3)
Aquaculture International     Hybrid Journal   (Followers: 24)
Aquaculture Reports     Open Access   (Followers: 3)
Aquaculture, Aquarium, Conservation & Legislation - International Journal of the Bioflux Society     Open Access   (Followers: 7)
Aquatic Biology     Open Access   (Followers: 5)
Aquatic Ecology     Hybrid Journal   (Followers: 34)
Aquatic Ecosystem Health & Management     Hybrid Journal   (Followers: 15)
Aquatic Science and Technology     Open Access   (Followers: 3)
Aquatic Toxicology     Hybrid Journal   (Followers: 23)
Archaea     Open Access   (Followers: 3)
Archiv für Molluskenkunde: International Journal of Malacology     Full-text available via subscription   (Followers: 3)
Archives of Biological Sciences     Open Access  
Archives of Microbiology     Hybrid Journal   (Followers: 8)
Archives of Natural History     Hybrid Journal   (Followers: 6)
Archives of Oral Biology     Hybrid Journal   (Followers: 2)
Archives of Virology     Hybrid Journal   (Followers: 5)
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2)
Arid Ecosystems     Hybrid Journal   (Followers: 2)
Arquivos do Instituto Biológico     Open Access   (Followers: 1)
Arquivos do Museu Dinâmico Interdisciplinar     Open Access  
Arthropod Structure & Development     Hybrid Journal   (Followers: 2)
Arthropods     Open Access   (Followers: 1)
Artificial DNA: PNA & XNA     Hybrid Journal   (Followers: 3)
Asian Bioethics Review     Full-text available via subscription   (Followers: 3)
Asian Journal of Biodiversity     Open Access   (Followers: 4)
Asian Journal of Biological Sciences     Open Access   (Followers: 3)
Asian Journal of Cell Biology     Open Access   (Followers: 5)
Asian Journal of Developmental Biology     Open Access   (Followers: 2)
Asian Journal of Medical and Biological Research     Open Access   (Followers: 4)
Asian Journal of Nematology     Open Access   (Followers: 4)
Asian Journal of Poultry Science     Open Access   (Followers: 4)
Atti della Accademia Peloritana dei Pericolanti - Classe di Scienze Medico-Biologiche     Open Access  
Australian Life Scientist     Full-text available via subscription   (Followers: 2)
Australian Mammalogy     Hybrid Journal   (Followers: 6)
Autophagy     Hybrid Journal   (Followers: 2)
Avian Biology Research     Full-text available via subscription   (Followers: 4)
Avian Conservation and Ecology     Open Access   (Followers: 11)
Bacteriology Journal     Open Access   (Followers: 1)
Bacteriophage     Full-text available via subscription   (Followers: 3)
Bangladesh Journal of Bioethics     Open Access  
Bangladesh Journal of Plant Taxonomy     Open Access  
Bangladesh Journal of Scientific Research     Open Access   (Followers: 1)
Batman Üniversitesi Yaşam Bilimleri Dergisi     Open Access  
Berita Biologi     Open Access   (Followers: 1)
Between the Species     Open Access   (Followers: 1)
Bio Tribune Magazine     Hybrid Journal  
BIO Web of Conferences     Open Access  
BIO-Complexity     Open Access  
Bio-Grafía. Escritos sobre la Biología y su enseñanza     Open Access  
Bioanalytical Reviews     Hybrid Journal   (Followers: 2)
Biocatalysis and Biotransformation     Hybrid Journal   (Followers: 6)
BioCentury Innovations     Full-text available via subscription   (Followers: 1)
Biochemistry and Cell Biology     Hybrid Journal   (Followers: 15)
Biochimie     Hybrid Journal   (Followers: 7)
BioControl     Hybrid Journal   (Followers: 5)
Biocontrol Science and Technology     Hybrid Journal   (Followers: 5)
Biodemography and Social Biology     Hybrid Journal  
BioDiscovery     Open Access   (Followers: 2)
Biodiversitas : Journal of Biological Diversity     Open Access  
Biodiversity Data Journal     Open Access   (Followers: 4)
Biodiversity Informatics     Open Access   (Followers: 1)
Biodiversity Information Science and Standards     Open Access  
Biodiversity: Research and Conservation     Open Access   (Followers: 26)
Bioedukasi : Jurnal Pendidikan Biologi FKIP UM Metro     Open Access  
Bioeksperimen : Jurnal Penelitian Biologi     Open Access  
Bioelectrochemistry     Hybrid Journal   (Followers: 2)
Bioelectromagnetics     Hybrid Journal   (Followers: 1)
Bioenergy Research     Hybrid Journal   (Followers: 2)
Bioengineering and Bioscience     Open Access   (Followers: 1)
BioEssays     Hybrid Journal   (Followers: 10)
Bioethics     Hybrid Journal   (Followers: 15)
BioéthiqueOnline     Open Access  
Biofabrication     Hybrid Journal   (Followers: 5)
Biofilms     Full-text available via subscription   (Followers: 1)
Biogeosciences (BG)     Open Access   (Followers: 10)
Biogeosciences Discussions (BGD)     Open Access   (Followers: 2)
Bioinformatics     Hybrid Journal   (Followers: 305)
Bioinformatics and Biology Insights     Open Access   (Followers: 11)
Bioinspiration & Biomimetics     Hybrid Journal   (Followers: 7)
Biointerphases     Open Access   (Followers: 1)
Biojournal of Science and Technology     Open Access  
BioLink : Jurnal Biologi Lingkungan, Industri, Kesehatan     Open Access  
Biologia     Hybrid Journal  
Biologia on-line : Revista de divulgació de la Facultat de Biologia     Open Access  
Biological Bulletin     Partially Free   (Followers: 6)
Biological Control     Hybrid Journal   (Followers: 4)
Biological Invasions     Hybrid Journal   (Followers: 20)
Biological Journal of the Linnean Society     Hybrid Journal   (Followers: 18)
Biological Letters     Open Access   (Followers: 5)
Biological Procedures Online     Open Access  
Biological Psychiatry     Hybrid Journal   (Followers: 48)
Biological Psychology     Hybrid Journal   (Followers: 6)
Biological Research     Open Access  
Biological Rhythm Research     Hybrid Journal   (Followers: 2)

        1 2 3 4 5 6 7 8 | Last

Journal Cover
Actualidades Biológicas
Number of Followers: 1  

  This is an Open Access Journal Open Access journal
ISSN (Print) 0304-3584 - ISSN (Online) 2145-7166
Published by SciELO Homepage  [718 journals]
  • Composition and structure of the heteropterans (Hemiptera) on coastal
           lotic ecosystems from Colombian Pacific

    • Abstract: Resumen Los Heteroptera acuáticos y semiacuáticos presentan alta riqueza en el Pacífico de Colombia. Estudios sobre la biología, ecología y distribución geográfica y altitudinal son conocidos para algunas de las especies presentes tanto en ecosistemas litorales de aguas salobres como dulceacuícolas lénticos y lóticos. El objetivo de este estudio fue comparar tres comunidades de heterópteros acuáticos y semiacuáticos, de ecosistemas lóticos costeros del Pacífico de Colombia, con base en su composición, riqueza, diversidad y abundancia. Con el fin de alcanzar este objetivo se muestrearon tres áreas entre los 0 y 35 m de altitud sobre el nivel del mar del litoral Pacífico en Tumaco (departamento de Nariño): dos asociadas con hábitats lóticos permanentes de los ríos Mejicano y Caunapí y una tercera asociada con un arroyo de flujo lento en Candelillas. Se determinó la composición, riqueza, diversidad y abundancia de cada uno de los tres ecosistemas lóticos, la diversidad beta con base en el análisis de similitud de Jaccard y el valor de importancia de las especies por su abundancia. Se recolectaron 339 individuos pertenecientes a siete familias y 25 especies. Cada ecosistema presentó 11 especies y la familia más abundante en los tres fue Gerridae. La composición específica, la diversidad y la abundancia, tanto de géneros como de especies, difirieron entre los tres sistemas. La similitud entre los tres ecosistemas lóticos fue inferior al 20%. El ecosistema acuático con mayor diversidad en heterópteros, según el índice de Shannon-Wiener, fue el arroyo de Candelillas. En río Mejicano el género con mayor número de especies y de individuos fue Rhagovelia y la especie más abundante fue Telmatometra whitei; en río Caunapí el género con mayor número de especies y de individuos fue Rhagovelia y la especie más abundante fue Martarega lofoides; en el arroyo de Candelillas el género con mayor número de especies y de individuos fue Rheumatobates y la especie más abundante fue R. peculiaris. La especie con mayor valor de importancia fue Telmatometra whitei. Los tres ecosistemas lóticos costeros estudiados presentaron diferente composición de especies de heterópteros y una estructura disímil en un rango altitudinal muy estrecho. Aquatic and semiaquatic heteropterans present high richness in the Colombian Pacific Region. Studies about biology, ecology, as well as geographical and altitudinal distribution have provided a great amount of data about some species inhabiting brackish waters, as well as lentic and lotic freshwaters. Based on that, the aim of this study was to compare three communities of aquatic and semiaquatic heteropterans of lotic freshwater ecosystems from the Pacific coastal region in Colombia based on species composition, richness, diversity and abundance. In order to meet this objective, sites were sampled at altitudes ranging from 0 and 35 m of altitude above sea level in the Pacific littoral in Tumaco (Department of Nariño): two sites were located in permanent lotic ecosystems in the Mejicano and Caunapí rivers and a third site was located in a slow-flow intermittent stream in Candelillas. The composition, richness, diversity and abundance for each ecosystem, as well as the beta diversity on the basis of the Jaccard similarity coefficient and the value of importance of species for abundance were determined. A total of 339 individuals, seven families and 25 species were recorded. Each ecosystem presented 11 species, with Gerridae the most abundant family in the three ecosystems. Differences between the specific composition, diversity and abundance of the three ecosystems, in terms of genera and species, were deter mined. The similarity between the three aquatic ecosystems was lower than 20%. The intermittent stream in Candelillas was the aquatic ecosystem with the greatest diversity of heteropterans, according to the index of Shannon-Wiener. In the Mejicano River, Rhagovelia was the genus with a greatest number of species and individuals, and Telmatometra whitei was the most abundant species. In the Caunapí river, Rhagovelia was the genus with the greatest number of species and individuals and Martarega lofoides was the most abundant species. In the intermittent stream in Candelillas, Rheumatobates was the genus with the greatest number of species and individuals, and R. peculiaris was the most abundant species. The species with the highest Importance Value Index was Telmatometra whitei. The three coastal lotic ecosystems presented different compositions of heteropteran species and dissimilar structure over a very narrow altitudinal range.
       
  • Riparian spider communities as indicators of stream ecosystem condition in
           the Río Piedras watershed of Puerto Rico

    • Abstract: Human degradation of stream ecosystems has led to the creation of a number of methods to assess the severity of such anthropogenic impacts. Biomonitoring protocols that utilize aquatic organisms, in particular macroinvertebrates, are used worldwide as a way to evaluate stream ecosystems. Despite the various benefits these methods provide, they only take into account the stream channel, ignoring altogether the condition of the riparian zone. Other methods look at physical characteristics of both the riparian area and the stream, but ignore biota. Riparian consumers such as spiders have been proposed as potential bioindicators because they could provide a more holistic alternative for assessing stream impairment. Our aim was to determine whether changes in riparian spider communities could be used as indicators to separate sites with different levels of impact along an urban gradient. We conducted correlation analyses of riparian spider community metrics (abundance and species richness) and the percent of vegetation cover in subwatersheds with varying levels of urbanization, along with three other popular stream monitoring protocols. We found a clear difference in spider community composition among subwatersheds, with an overall trend for lower richness and abundances in more impacted sites. Spider abundance correlated significantly with percent vegetation coverage and spider family richness correlated significantly with two widely employed stream monitoring protocols. These findings support the utility of riparian spider communities as indicators for disturbances of stream ecosystems in Puerto Rico and should be incorporated into future biomonitoring protocols to ensure a more holistic view of the condition of stream ecosystems.Resumen La degradación de los sistemas ribereños, por causa de las actividades humanas, ha permitido el desarrollo de numerosos métodos que evalúan la severidad de los impactos antropogénicos. Los protocolos de biomonitoreo, empleando macroinvertebrados acuáticos, son usados mundialmente en estas evaluaciones. No obstante, estos métodos tienen la desventaja que solo evalúan el canal del río, ignorando la zona ribereña adyacente. Otros métodos consideran, en su evaluación, las características físicas de ambas zonas, pero ignoran la biota del lugar. Las arañas ribereñas se han discutido como potenciales bioindicadores dado que podrían proveer una alternativa más holística para evaluar los sistemas ribereños. Nuestro objetivo fue determinar si los cambios en las comunidades de arañas ribereñas podrían utilizarse para separar lugares con diferentes niveles de impacto. Se correlacionó el porcentaje de cobertura vegetal y diferentes protocolos de biomonitoreo, con métricas de riqueza y abundancia de arañas a lo largo de un gradiente urbano. Se encontraron diferencias en la composición de la comunidad de arañas entre lugares, con una tendencia general de menor riqueza y menor abundancia en los sitios más impactados. La abundancia de las arañas se correlacionó significativamente con el porcentaje de cobertura vegetal y la riqueza de familias se correlacionó con dos de los protocolos de monitoreo usados. Estos hallazgos respaldan la utilización de las comunidades de arañas como indicadoras de disturbio en los ecosistemas ribereños de Puerto Rico. Sugerimos incorporar las comunidades de arañas ribereñas en futuros protocolos de biomonitoreo para asegurar una visión más holística de las condiciones de los lugares evaluados.
       
  • Density, biomass and feeding of Anacroneuria Klapálek 1909 (Plecoptera:
           Perlidae) in a tropical river

    • Abstract: Resumen Entre los insectos acuáticos, los plecópteros desempeñan un rol destacado en la descomposición y la recirculación de nutrientes y contribuyen, en la red trófica, como alimento de otros insectos y vertebrados. El propósito de este estudio fue conocer la variación de la biomasa y la dieta del género Anacroneuria durante cuatro meses en la parte media del río Gaira. Se recolectaron en total 1.284 individuos y se organizaron en cinco clases de tallas (0,1−0,5, 0,6−1,0, 1,1−1,5, 1,6−2,0 y 2,1−2,5 cm). Se encontraron diferencias en las clases de las tallas (H’=100,3; p<0,01; n=644) (las tallas mayores de 2 cm no se registraron en los muestreos 5 y 6). La abundancia entre microhábitats también registró diferencias significativas, donde la mayor abundancia se observó en la hojarasca (763 individuos) y la menor en la piedra (86 individuos). La biomasa acumulada total fue 441,6 PSLC mg/m2, donde las tallas intermedias (0,6−2,0 cm) fueron las que más contribuyeron a la biomasa del género (promedio PSLC: 215,53 ± 4,67 mg/m2), mientras que las tallas más grandes (2,1−2,5 cm) presentaron la menor contribución (promedio PSLC: 48,90 ± 4,62 mg/m2). No se encontró relación entre el contenido estomacal y las tallas; los restos animales y los detritos fueron los ítems alimentarios más frecuentes. La biomasa disponible por el género Anacroneuria evidenció una importante disponibilidad energética que es afectada negativamente por las precipitaciones y los caudales. Among the aquatic insects, the Plecoptera play an important role in decomposition and nutrient recycling. Moreover, they are important in the energy flow throughout the system, as they are food to other insects and vertebrates. The aim of this research was to study the biomass and diet dynamics of Anacroneuria during four months in the middle basin of the Gaira River. A total of 1284 organisms were collected and organized into five size classes (0.1−0.5, 0.6−1.0, 1.1−1.5, 1.6−2.0 y 2.1−2.5 cm). We found differences size classes (H’=100.3; p<0.01; n=644). The > 2 cm size class was not found during samplings 5 and 6. Abundance was significantly different among microhabitats; with the highest abundance observed in leaves (763 organisms) and the lowest in gravel stones (86 organisms). The cumulative biomass was 441.6 PSLC mg/m2, where the intermediate sizes (0.6−2,0 cm) were the largest contributors to the biomass of the genus (average AFDW: 215.53 ± 4.67 mg/m2), while the largest size (2.1-2.5 cm) had the lowest contribution (average AFDW: 48.90 ± 4.62 mg/m2). The was no significant correlation between gut contents and body size. The most common fragments in gut contents were animals and detritus. Biomass available to the Anacroneuria genus had provides a high energy content that was negatively affected by rainfall and discharges.
       
  • State of knowledge of aquatic macroinvertebrates of Hispaniola island

    • Abstract: Resumen La Española es la isla de mayor riqueza hidrológica de las Antillas Mayores y segunda en tamaño luego de Cuba. Dos naciones la ocupan, República Dominicana y Haití. En este trabajo se presenta el estado del conocimiento de los macroinvertebrados acuáticos de la isla La Española, resultando la primera lista de familias que unifica información dispersa y sirve de referente para futuros trabajos sobre la biota dulceacuícola. La metodología empleada incluyó la revisión de literatura y la inspección de aproximadamente 4.300 ejemplares de una colección de referencia. Los resultados muestran una rica biota compuesta por 107 familias de macroinvertebrados acuáticos, con los insectos como mayor componente (69 familias, 64,5% de los especímenes de la colección o 86,2% si se calcula con base en las 80 familias de insectos registradas para las Antillas Mayores), seguidos por los crustáceos (27) y los moluscos (11). Hay poca información sobre anélidos y platelmintos. Los órdenes de insectos con mayor riqueza de familias fueron Diptera (17), Coleoptera (15) y Trichoptera (12). El orden Megaloptera no está registrado para la isla y Plecoptera solo se conoce del registro fósil. Con base en el conocimiento de expertos se adicionaron Xiphocarididae (Decapoda), Hydrochidae (Coleoptera) y Blephariceridae (Diptera) y se sustituyó Tricorythidae por Leptohyphidae (Ephemeroptera). Se sugiere: a) mejorar las colecciones de referencia y su accesibilidad, b) realizar estudios taxonómicos enfatizando los grupos menos conocidos, c) realizar inventarios faunísticos, d) incorporar los macroinvertebrados en los programas de bioindicación y e) la formación de especialistas a nivel local. Hispaniola is the island of greatest hydrological wealth in the Greater Antilles and is second in size (77,914 km2) after Cuba (104,556 km2). Two nations occupy this island, the Dominican Republic and Haiti. This paper presents the state of knowledge of the aquatic macroinvertebrates of Hispaniola, resulting in the first list of Families, unifying dispersed information, and may constitute a reference for future work on this freshwater biota. The methodology was based on a literature review and the inspection of ca. 4300 specimens in a reference collection. The results show a rich biota composed of 107 Families of aquatic macroinvertebrates, with insects being the major component (69 families, 64.5% of collection specimens, or 86.2% if calculated based upon the 80 insect families registered for the Greater Antilles), followed by crustaceans (27) and molluscs (11). There is little information available on annelids and flatworms. The Orders of insects with greatest richness of Families were Diptera (17), Coleoptera (15) and Trichoptera (12). The Order Megaloptera is not reported for the island and Plecoptera is only known from a fossil record. The following additions were made based upon expert knowledge: Xiphocarididae (Decapoda), Hydrochidae (Coleoptera) and Blephariceridae (Diptera), and Tricorythidae was replaced by Leptohyphidae (Ephemeroptera). It is suggested to: a) improve reference collections and their accessibility, b) conduct taxonomic studies emphasizing poorly known groups, c) undertake more surveys, d) incorporate macroinvertebrates into bioindicator programs, and e) training of specialists at the local level.
       
  • Temporal variation of taxonomic diversity and functional traits of aquatic
           

    • Abstract: Resumen Los ríos intermitentes en Colombia se localizan principalmente en zonas de bosque seco, con relevancia en el ciclo hidrológico, el mantenimiento de la biodiversidad y el suministro de agua en estas regiones. Aspectos del funcionamiento de estos sistemas no se conocen, especialmente en zonas insulares. Este trabajo describe los cambios en composición, diversidad y algunos rasgos funcionales de los macroinvertebrados, relacionados con fluctuaciones de caudal, en tres ríos de la isla de Providencia. Se realizaron muestreos en temporada seca y temporada de lluvias. Se seleccionaron diez (10) rasgos funcionales y 50 categorías que incluyen características tróficas, fisiológicas, morfológicas, conductuales y del ciclo vital. El análisis de componentes principales confirma una marcada estacionalidad asociada con la variación de conductividad eléctrica, alcalinidad y oxígeno disuelto. Se identificaron 60 géneros-morfotipos con mayor riqueza de quironómidos, tricópteros y coleópteros. Según el análisis de correspondencia canónica, Chironomus, Pyrgophorus, Haitia y Dero se asociaron con valores altos en la conductividad eléctrica, oxígeno disuelto y dureza total. Respecto a rasgos, en la época seca predominaron mecanismos para resistir la desecación (capullos o diapausa), reproducción asexual, ciclos de vida rápidos estacionales, preferencia por sustrato hojarasca y hábito raspador, como: Ancylidae, Dero, Anopheles, Microvelia y Neritina. En la época de lluvia se hallaron cuerpos con caparazón o estuches, ciclos de vida lentos estacionales y hábito trófico colector recolector, como: Macrobrachium, Polypedilum, Helicopsyche, Beardius y Chironomus. Se concluye que la condición hidrológica incide en la estructura y funcionalidad de los macroinvertebrados y que algunos rasgos fisiológicos y de historias de vida son esenciales para permanecer en ambientes temporales. Intermittent streams in Colombia are located principally in dry forest zones and are important in maintaining the hydrological cycle and sustaining biodiversity and the water supply for local human populations. Some aspects of the functioning of these systems are not known in detail, especially in insular areas. This study describes the changes in the species composition, diversity, and some functional traits of macroinvertebrates related to discharge fluctuations in three intermittent streams on Old Providence Island. Sampling was performed during dry and rainy seasons. Ten (10) and 50 functional traits categories were selected, including trophic, physiological, morphological, behavioral and life cycle characteristics. A principal component analysis confirmed a strong seasonality associated with changes in electric conductivity, alkalinity, and dissolved oxygen. Sixty genus-level morphotypes were identified, with highest diversity in the Chironomidae (Diptera). According to a Canonical Correspondence Analysis, Chironomus, Pyrgophorus, Haitia and Dero were associated with high values in electrical conductivity, dissolved oxygen, and total hardness. With respect to functional traits, during dry season mechanisms for resisting specialized to resist the desiccation (cocoon or diapause), asexual reproduction, seasonal short life cycles, preferences for litter microhabitat, and trophic habit scrapers redominated, such as Ancylidae, Dero, Anopheles, Microvelia and Neritina. During rainy season bodies protected with shells or cases, seasonal long life cycles, and trophic collectors were found, such as Macrobrachium, Polypedilum, Helicopsyche, Beardius and Chironomus. In conclusion, hydrological conditions affect the taxonomic and functional structure of the macroinvertebrates, and some physiological traits and life histories are essential for persistence in temporal environments.
       
  • PCBs Rhizoremediation assessment using Avena sativa, Medicago sativa,
           Brachiaria decumbens and Brassica juncea

    • Abstract: Resumen Este trabajo evaluó el efecto de los compuestos liberados durante la renovación de raíces de cuatro plantas: Avena sativa, Brachiaria decumbens, Brassica juncea y Medicago sativa, en la degradación de seis congéneres de bifenilos policlorados (PCBs) en un suelo contaminado con Aroclor 1260. Los ensayos se realizaron en microcosmos con 20 g de suelo a los cuales se les adicionaron triturados de raíces de las plantas cultivadas en suelo contaminado con PCBs y se usaron como controles: suelo con bifenil y con ácido salicílico y suelo sin adiciones. Los microcosmos se incubaron durante 45 días en condiciones controladas. Al finalizar la incubación se tomaron muestras para la determinación de la concentración de los PCB 44, PCB66, PCB118, PCB138, PCB153, PCB180 y PCB170, del gen BphA1 y determinación de la hidrólisis de fluoresceína. También se analizaron los extractos obtenidos de la raíz para identificar metabolitos secundarios. En los microcosmos con Brassica juncea y con bifenil se observó disminución de la concentración de los PCB66, 118 y 138. Así mismo, en estos microcosmos se observó mayor concentración del gen BphA1 y de fluoresceína. Los análisis de los extractos de raíz permitieron identificar diferentes metabolitos secundarios asociados con las plantas, siendo los extractos de la planta Brassica juncea donde se detectó mayor número de metabolitos. Los resultados permitieron comprobar el efecto de los compuestos liberados por las raíces de ciertas plantas sobre las poblaciones microbianas del suelo con capacidad de degradar PCBs. This work evaluated the effect of compounds releases during the root turnover of Avena sativa, Medicago sativa, Brachiaria decumbens and Brassica juncea on degradation of 6 Polychlorinated biphenyls congeners, in a soil polluted with Aroclor 1260. The tests were conducted in microcosm with 20 g of soil to which were added crushed roots of plants previously grown in soil contaminated with PCBs. Microcosms with biphenyl, salicylic acid, and without additions were used as controls. Microcosms were incubated for 45 days under controlled conditions. After incubation time, concentration of PCBs 44, PCB66, PCB118, PCB138, PCB153, PCB180 and PCB170 was determined. BphA1 gene concentration and hydrolysis of fluorescein were also evaluated. Root extracts of plants were analyzed in order to identify some secondary metabolites. In the microcosm with Brassica juncea and biphenyl concentration decreasing of PCBs 66, 118, and 138 was observed. The higher concentration of BphA1 gene and fluorescein was also observed in Brassica juncea and biphenyl microcosms. The analysis of root extracts allowed identifying different secondary metabolites associated with the roots plant, especially in Brassica juncea root extracts. The results allowed testing the effect of the compounds released by the roots of certain plants in the soil microbial populations capable of degrading PCBs.
       
  • Galleria mellonella immunological challenge with Leishmania promastigotes
           triggers changes on the profile expression of low molecular weight
           proteins

    • Abstract: Resumen El parásito Leishmania es responsable de varias enfermedades que afectan humanos y animales en más de 95 países, incluido Colombia. Es conocida la toxicidad que presentan drogas como el Glucantime y la Anfotericina B, usadas en el tratamiento contra este parásito. Los péptidos antimicrobianos (PAMs) son considerados agentes prometedores contra un amplio espectro de enfermedades infecciosas, siendo potenciales agentes terapéuticos con una baja toxicidad. Los PAMs son parte de la respuesta inmune de insectos, de donde han sido aislados, demostrando tener actividad antibacteriana y anti-fúngica. La polilla Galleria mellonella expresa un amplio repertorio de péptidos como respuesta al reto con diversos organismos, lo que sugiere una alternativa para la obtención de péptidos con actividad antiparasitaria. Este estudio utilizó un reto inmunológico con promastigotes de Leishmania (Viannia) panamensis sobre larvas de Galleria mellonella para la búsqueda de fracciones peptídicas con actividad antiparasitaria. La hemolinfa fue obtenida de larvas control, inoculadas con PBS y retadas con parásitos. La hemolinfa libre de hemocitos de cada tratamiento fue analizada por electroforesis de dos dimensiones (gel 2D). Además, la hemolinfa fue fraccionada por RP-HPLC. El análisis del gel 2D identificó cuatro señales (manchas) en la hemolinfa retada y 3 señales en la hemolinfa con PBS. Estas señales no se encontraron en la hemolinfa control. Por otro lado, fracciones de RP-HPLC de la hemolinfa retada mostraron más actividad leishmanicida en comparación con las mismas fracciones de la hemolinfa control. Esta aproximación puede proveer nuevos péptidos contra Leishmania. The Leishmania parasite is responsible for several diseases that affect humans and animals in more than 95 countries including Colombia. Despite the known toxicity shown by current drugs such as Glucantime or Amphotericin B, they are still used as treatments against the parasite. Natural antimicrobial peptides (AMPs) are considered promising agents for use against a broad spectrum of infectious diseases, they are considered promising and non-toxic therapeutic agents. AMPs are part of the immune response of organisms such as insects, from where they have been isolated and shown to have antibacterial and antifungal activity. Galleria mellonella moths express a broad repertoire of peptides in response to challenges with different organisms. This suggests an alternative for obtaining peptides with anti-parasitic activity. This study was based on the immunological challenge induced in Galleria mellonella larvae with Leishmania (viannia) panamensis promastigotes, with the goal of isolating a peptide fraction with antiparasitic activity. Non-challenged hemolymph and hemolymph obtained from the immunization with PBS and parasites were compared. Free hemocyte hemolymph from each treatment was analyzed by two-dimensional electrophoresis (2D gel). Furthermore, hemolymphs were fractionated by RP-HPLC. 2D gel analysis identified 4 spots in challenged hemolymph and 3 spots in PBS hemolymph. These spots were not present in the control hemolymph. On the other hand, fractions from RPHPLC of challenged hemolymph showed more antileishmania activity in comparison to the same fractions from the hemolymph control. This study may provide the basis for new antileishmanial peptides.
       
  • Evaluation of gene variants in the CYP2A6 and CHRNA5 genes and their
           implications for addiction to tobacco in the population of Itagüí,
           Colombia

    • Abstract: Resumen El tabaquismo es un problema de salud pública dado que el consumo es cada vez mayor y presenta edades de inicio más tempranas; en relación con los procesos biológicos del tabaquismo se han identificado varios genes cuyas variantes han sido asociadas con este fenómeno. El objetivo de este estudio fue evaluar la relación entre los polimorfismos rs6801272 y rs680244 en los genes CYP2A6 y CHRNA5 respectivamente, con el consumo de tabaco. Para esto se realizó un estudio de casos (fumadores-exfumadores versus controles), controlando las variables edad y sexo, además de considerar la edad de inicio y el número de cigarrillos por día. El locus rs6801272 se encontró monomórfico en la población de estudio, presentando el alelo T asociado con el metabolismo normal de la nicotina; aunque el locus rs680244 se encontró polimórfico, no fue posible establecer la relación de esta variante genética con el consumo de cigarrillos (OR 3,2) o la capacidad de abandono (OR 5,3); tampoco fue posible establecer una correlación entre el genotipo y el número de cigarrillos por día (R2= 0,001) o el genotipo y la edad de inicio (R2=0,015). En conclusión, no se detectó una relación entre las variantes genéticas estudiadas y el consumo, la capacidad de abandono, el número de cigarrillos por día y la edad de inicio en la población de Itagüí. Smoking is a public health problem because consumption is growing and exhibits earlier ages of onset; in terms of the biological processes of smoking, several genes have been identified whose variants are related to this phenomenon. The aim of this study was to evaluate the relationship between rs6801272 and rs680244 polymorphisms in genes CYP2A6 and CHRNA5, respectively, with the consumption of tobacco. For this, a case study was conducted (smokers-ex smokers versus controls) matched by age and sex, as well as considering starting age and number of cigarettes per day. The monomorphic locus rs6801272 was found in the study population, presenting the T allele associated with normal metabolism of nicotine; and the rs6801272 locus was found to be polymorphic, but the relationship of this genetic variation with cigarette smoking (OR 3,2) or the capacity to abandon smoking (OR 5,3) was not established; it was not possible to establish a correlation between the genotype and the number of cigarettes per day (R2 = 0,001) or genotype and age of onset (R2 = 0,015). In conclusion, a relationship between the genetic variants studied and consumption, capacity of quitting, number of cigarettes per day and age of onset was not detected.
       
  • A new species of Manekia Trel. (Piperaceae) in Northwest Colombia

    • Abstract: Manekia is one of five lineages recognized today in the Piperaceae. All species of Manekia are scandent lianas with petiolar margins extending throughout the petiole or beyond it into the leaf blade, with spikes often restricted to very short sympodial branches, appearing axillar, solitary or geminate, with four staminate flowers, anthers almost sessile and fruits partially to fully immersed in the rachis. Species of Manekia are entirely restricted to the Neotropics. At present, six species of Manekia are accepted in the genus. A detailed examination of all known collections, including the type specimens of Manekia, as well as field work in several areas of the Neotropics, suggest the existence of several taxonomic novelties within the genus, one of which (Manekia betancurii) is here described, from the western slopes of the western Cordillera in the department of Antioquia, Colombia. The new species is distinguished from all other species of Manekia by densely pubescent stems, petioles, peduncles, and lower surfaces of the leaves, leaves 9 pinnately nerved, and the petiolar margins extending 0.2−0.8 cm into the leaf blade. The new species is described and illustrated, a discussion on its distribution and ecology is provided and its taxonomic affinities discussed. A dichotomous key of all species recognized in Manekia (including M. betancurii) is also provided.Resumen Manekia es uno de los cinco linajes reconocidos en la familia Piperaceae. Todas las especies de Manekia son lianas escandentes con las márgenes peciolares extendidas toda la extensión del pecíolo o incluso alcanzando arriba de la base foliar sobre la lámina de la hoja, con espigas a menudo restringidas a ramas simpodiales muy cortas, y aparentemente axilares, solitarias o geminadas, flores con cuatro estambres, anteras casi sésiles y frutos parcialmente a completamente inmersos en el raquis. Actualmente, seis especies son reconocidas en Manekia, todas ellas restringidas al Neotrópico. Un examen detallado de todas las colecciones, incluyendo ejemplares tipo de Manekia, así como trabajo de campo en varias áreas del Neotrópico, sugieren la existencia de varias novedades taxonómicas al interior del género, unas de las cuales, Manekia betancurii es descrita aquí. La nueva especie prospera en el piedemonte occidental de la Cordillera Occidental en el departamento de Antioquia, Noroccidente de Colombia. M. betancurii se distingue de otras especies del género por los tallos, pecíolos, estípites y envés de las hojas densamente pubescentes, hojas 9 pinnatinervias, y márgenes peciolares extendidas 0.2−0.8 cm por encima de la base foliar. Así mismo, se describe e ilustra la nueva especie, se discute su distribución y ecología y se analizan sus afinidades taxonómicas. Se proporciona una clave dicotómica de todas las especies reconocidas en Manekia (incluido M. betancurii).
       
  • Morphological comparison and geographic distribution of the species
           Tabellaria fenestrata and Tabellaria flocculosa (Bacillariophyceae) in
           lotic and lentic systems in Colombia

    • Abstract: Resumen Este trabajo se desarrolló en el marco de un proyecto más amplio cuyo objetivo fue analizar la distribución geográfica de las diatomeas de Colombia, basados en el estudio de sistemas lóticos ubicados en las zonas biogeográficas de los Andes, el Caribe, la Orinoquía y el Pacífico. Durante la investigación se recolectaron muestras de perifiton en 18 sitios, en los cuales se midió la elevación sobre el nivel del mar, el caudal, la temperatura, el pH, la conductividad eléctrica y el oxígeno disuelto. En este trabajo se presentan los resultados del análisis de los taxones pertenecientes al género Tabellaria: T. fenestrata y T. flocculosa, dos especies morfológicamente similares que han sido confundidas frecuentemente. Se observaron y describieron ejemplares de ambos taxones mediante microscopia óptica y microscopia electrónica de barrido. Asimismo, se recopiló información en la literatura acerca de la distribución geográfica de estas dos especies en el país. Se concluye que Tabellaria flocculosa presenta una distribución geográfica más amplia y pocas restricciones ecológicas para colonizar y establecerse en los sistemas acuáticos, mientras que Tabellaria fenestrata presenta una distribución más restringida. This study was developed within the framework of a project conducted with the aim of analyzing the geographical distribution of diatoms in Colombia. This project was based on analyses of information on lotic systems located in the biogeographic regions of the Andes, Caribbean, Orinoquía and Pacific. During the research, periphyton samples were collected at 18 sampling sites. Current flow rate, temperature, pH, conductivity, dissolved oxygen and elevation were measured in each sampling site. We report the presence of two taxa belonging to the genus Tabellaria: T. fenestrata and T. flocculosa, which are morphologically similar and, therefore, have been frequently misidentified. Specimens of both taxa were observed and described with light microscopy and scanning electron microscopy. We also analyzed the geographical distribution of these taxa in the country. We conclude that T. flocculosa has a broad geographical distribution in Colombia and few ecological restrictions to colonize and settle in aquatic systems, while T. fenestrata has a more restricted distribution.
       
 
 
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