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Publisher: Springer-Verlag (Total: 2352 journals)

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Showing 1 - 200 of 2352 Journals sorted alphabetically
3D Printing in Medicine     Open Access   (Followers: 2)
3D Research     Hybrid Journal   (Followers: 21, SJR: 0.222, CiteScore: 1)
4OR: A Quarterly J. of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.825, CiteScore: 1)
AAPS J.     Hybrid Journal   (Followers: 23, SJR: 1.118, CiteScore: 4)
AAPS PharmSciTech     Hybrid Journal   (Followers: 7, SJR: 0.752, CiteScore: 3)
Abdominal Imaging     Hybrid Journal   (Followers: 17, SJR: 0.866, CiteScore: 2)
Abhandlungen aus dem Mathematischen Seminar der Universitat Hamburg     Hybrid Journal   (Followers: 4, SJR: 0.439, CiteScore: 0)
Academic Psychiatry     Full-text available via subscription   (Followers: 27, SJR: 0.53, CiteScore: 1)
Academic Questions     Hybrid Journal   (Followers: 8, SJR: 0.106, CiteScore: 0)
Accreditation and Quality Assurance: J. for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 30, SJR: 0.316, CiteScore: 1)
Acoustical Physics     Hybrid Journal   (Followers: 11, SJR: 0.359, CiteScore: 1)
Acoustics Australia     Hybrid Journal   (SJR: 0.232, CiteScore: 1)
Acta Analytica     Hybrid Journal   (Followers: 7, SJR: 0.367, CiteScore: 0)
Acta Applicandae Mathematicae     Hybrid Journal   (Followers: 1, SJR: 0.675, CiteScore: 1)
Acta Biotheoretica     Hybrid Journal   (Followers: 4, SJR: 0.284, CiteScore: 1)
Acta Diabetologica     Hybrid Journal   (Followers: 18, SJR: 1.587, CiteScore: 3)
Acta Endoscopica     Hybrid Journal   (Followers: 1)
acta ethologica     Hybrid Journal   (Followers: 4, SJR: 0.769, CiteScore: 1)
Acta Geochimica     Hybrid Journal   (Followers: 7, SJR: 0.24, CiteScore: 1)
Acta Geodaetica et Geophysica     Hybrid Journal   (Followers: 3, SJR: 0.305, CiteScore: 1)
Acta Geophysica     Hybrid Journal   (Followers: 11, SJR: 0.312, CiteScore: 1)
Acta Geotechnica     Hybrid Journal   (Followers: 7, SJR: 1.588, CiteScore: 3)
Acta Informatica     Hybrid Journal   (Followers: 5, SJR: 0.517, CiteScore: 1)
Acta Mathematica     Hybrid Journal   (Followers: 13, SJR: 7.066, CiteScore: 3)
Acta Mathematica Hungarica     Hybrid Journal   (Followers: 2, SJR: 0.452, CiteScore: 1)
Acta Mathematica Sinica, English Series     Hybrid Journal   (Followers: 6, SJR: 0.379, CiteScore: 1)
Acta Mathematica Vietnamica     Hybrid Journal   (SJR: 0.27, CiteScore: 0)
Acta Mathematicae Applicatae Sinica, English Series     Hybrid Journal   (SJR: 0.208, CiteScore: 0)
Acta Mechanica     Hybrid Journal   (Followers: 21, SJR: 1.04, CiteScore: 2)
Acta Mechanica Sinica     Hybrid Journal   (Followers: 5, SJR: 0.607, CiteScore: 2)
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 7, SJR: 0.576, CiteScore: 2)
Acta Meteorologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.638, CiteScore: 1)
Acta Neurochirurgica     Hybrid Journal   (Followers: 7, SJR: 0.822, CiteScore: 2)
Acta Neurologica Belgica     Hybrid Journal   (Followers: 2, SJR: 0.376, CiteScore: 1)
Acta Neuropathologica     Hybrid Journal   (Followers: 4, SJR: 7.589, CiteScore: 12)
Acta Oceanologica Sinica     Hybrid Journal   (Followers: 3, SJR: 0.334, CiteScore: 1)
Acta Physiologiae Plantarum     Hybrid Journal   (Followers: 3, SJR: 0.574, CiteScore: 2)
Acta Politica     Hybrid Journal   (Followers: 15, SJR: 0.605, CiteScore: 1)
Activitas Nervosa Superior     Hybrid Journal   (SJR: 0.147, CiteScore: 0)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 8, SJR: 0.103, CiteScore: 0)
ADHD Attention Deficit and Hyperactivity Disorders     Hybrid Journal   (Followers: 25, SJR: 0.72, CiteScore: 2)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 9)
Administration and Policy in Mental Health and Mental Health Services Research     Partially Free   (Followers: 18, SJR: 1.005, CiteScore: 2)
Adsorption     Hybrid Journal   (Followers: 5, SJR: 0.703, CiteScore: 2)
Advances in Applied Clifford Algebras     Hybrid Journal   (Followers: 4, SJR: 0.698, CiteScore: 1)
Advances in Atmospheric Sciences     Hybrid Journal   (Followers: 37, SJR: 0.956, CiteScore: 2)
Advances in Computational Mathematics     Hybrid Journal   (Followers: 19, SJR: 0.812, CiteScore: 1)
Advances in Contraception     Hybrid Journal   (Followers: 3)
Advances in Data Analysis and Classification     Hybrid Journal   (Followers: 57, SJR: 1.09, CiteScore: 1)
Advances in Gerontology     Partially Free   (Followers: 8, SJR: 0.144, CiteScore: 0)
Advances in Health Sciences Education     Hybrid Journal   (Followers: 32, SJR: 1.64, CiteScore: 2)
Advances in Manufacturing     Hybrid Journal   (Followers: 4, SJR: 0.475, CiteScore: 2)
Advances in Polymer Science     Hybrid Journal   (Followers: 45, SJR: 1.04, CiteScore: 3)
Advances in Therapy     Hybrid Journal   (Followers: 5, SJR: 1.075, CiteScore: 3)
Aegean Review of the Law of the Sea and Maritime Law     Hybrid Journal   (Followers: 7)
Aequationes Mathematicae     Hybrid Journal   (Followers: 2, SJR: 0.517, CiteScore: 1)
Aerobiologia     Hybrid Journal   (Followers: 3, SJR: 0.673, CiteScore: 2)
Aesthetic Plastic Surgery     Hybrid Journal   (Followers: 11, SJR: 0.825, CiteScore: 1)
African Archaeological Review     Hybrid Journal   (Followers: 21, SJR: 0.862, CiteScore: 1)
Afrika Matematika     Hybrid Journal   (Followers: 1, SJR: 0.235, CiteScore: 0)
AGE     Hybrid Journal   (Followers: 7)
Ageing Intl.     Hybrid Journal   (Followers: 7, SJR: 0.39, CiteScore: 1)
Aggiornamenti CIO     Hybrid Journal   (Followers: 1)
Aging Clinical and Experimental Research     Hybrid Journal   (Followers: 3, SJR: 0.67, CiteScore: 2)
Agricultural Research     Hybrid Journal   (Followers: 6, SJR: 0.276, CiteScore: 1)
Agriculture and Human Values     Hybrid Journal   (Followers: 14, SJR: 1.173, CiteScore: 3)
Agroforestry Systems     Hybrid Journal   (Followers: 20, SJR: 0.663, CiteScore: 1)
Agronomy for Sustainable Development     Hybrid Journal   (Followers: 13, SJR: 1.864, CiteScore: 6)
AI & Society     Hybrid Journal   (Followers: 9, SJR: 0.227, CiteScore: 1)
AIDS and Behavior     Hybrid Journal   (Followers: 14, SJR: 1.792, CiteScore: 3)
Air Quality, Atmosphere & Health     Hybrid Journal   (Followers: 4, SJR: 0.862, CiteScore: 3)
Akupunktur & Aurikulomedizin     Full-text available via subscription   (Followers: 1)
Algebra and Logic     Hybrid Journal   (Followers: 6, SJR: 0.531, CiteScore: 0)
Algebra Universalis     Hybrid Journal   (Followers: 2, SJR: 0.583, CiteScore: 1)
Algebras and Representation Theory     Hybrid Journal   (Followers: 1, SJR: 1.095, CiteScore: 1)
Algorithmica     Hybrid Journal   (Followers: 9, SJR: 0.56, CiteScore: 1)
Allergo J.     Full-text available via subscription   (Followers: 1, SJR: 0.234, CiteScore: 0)
Allergo J. Intl.     Hybrid Journal   (Followers: 2)
Alpine Botany     Hybrid Journal   (Followers: 5, SJR: 1.11, CiteScore: 3)
ALTEX : Alternatives to Animal Experimentation     Open Access   (Followers: 3)
AMBIO     Hybrid Journal   (Followers: 10, SJR: 1.569, CiteScore: 4)
American J. of Cardiovascular Drugs     Hybrid Journal   (Followers: 16, SJR: 0.951, CiteScore: 3)
American J. of Community Psychology     Hybrid Journal   (Followers: 29, SJR: 1.329, CiteScore: 2)
American J. of Criminal Justice     Hybrid Journal   (Followers: 9, SJR: 0.772, CiteScore: 1)
American J. of Cultural Sociology     Hybrid Journal   (Followers: 18, SJR: 0.46, CiteScore: 1)
American J. of Dance Therapy     Hybrid Journal   (Followers: 5, SJR: 0.181, CiteScore: 0)
American J. of Potato Research     Hybrid Journal   (Followers: 2, SJR: 0.611, CiteScore: 1)
American J. of Psychoanalysis     Hybrid Journal   (Followers: 21, SJR: 0.314, CiteScore: 0)
American Sociologist     Hybrid Journal   (Followers: 16, SJR: 0.35, CiteScore: 0)
Amino Acids     Hybrid Journal   (Followers: 8, SJR: 1.135, CiteScore: 3)
AMS Review     Partially Free   (Followers: 4)
Analog Integrated Circuits and Signal Processing     Hybrid Journal   (Followers: 7, SJR: 0.211, CiteScore: 1)
Analysis and Mathematical Physics     Hybrid Journal   (Followers: 5, SJR: 0.536, CiteScore: 1)
Analysis in Theory and Applications     Hybrid Journal   (Followers: 1)
Analysis of Verbal Behavior     Hybrid Journal   (Followers: 6)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32, SJR: 0.978, CiteScore: 3)
Anatomical Science Intl.     Hybrid Journal   (Followers: 3, SJR: 0.367, CiteScore: 1)
Angewandte Schmerztherapie und Palliativmedizin     Hybrid Journal  
Angiogenesis     Hybrid Journal   (Followers: 3, SJR: 2.177, CiteScore: 5)
Animal Cognition     Hybrid Journal   (Followers: 20, SJR: 1.389, CiteScore: 3)
Annales françaises de médecine d'urgence     Hybrid Journal   (Followers: 1, SJR: 0.192, CiteScore: 0)
Annales Henri Poincaré     Hybrid Journal   (Followers: 3, SJR: 1.097, CiteScore: 2)
Annales mathématiques du Québec     Hybrid Journal   (Followers: 4, SJR: 0.438, CiteScore: 0)
Annali dell'Universita di Ferrara     Hybrid Journal   (SJR: 0.429, CiteScore: 0)
Annali di Matematica Pura ed Applicata     Hybrid Journal   (Followers: 1, SJR: 1.197, CiteScore: 1)
Annals of Biomedical Engineering     Hybrid Journal   (Followers: 17, SJR: 1.042, CiteScore: 3)
Annals of Combinatorics     Hybrid Journal   (Followers: 4, SJR: 0.932, CiteScore: 1)
Annals of Data Science     Hybrid Journal   (Followers: 12)
Annals of Dyslexia     Hybrid Journal   (Followers: 10, SJR: 0.85, CiteScore: 2)
Annals of Finance     Hybrid Journal   (Followers: 34, SJR: 0.579, CiteScore: 1)
Annals of Forest Science     Hybrid Journal   (Followers: 7, SJR: 0.986, CiteScore: 2)
Annals of Global Analysis and Geometry     Hybrid Journal   (Followers: 1, SJR: 1.228, CiteScore: 1)
Annals of Hematology     Hybrid Journal   (Followers: 15, SJR: 1.043, CiteScore: 2)
Annals of Mathematics and Artificial Intelligence     Hybrid Journal   (Followers: 12, SJR: 0.413, CiteScore: 1)
Annals of Microbiology     Hybrid Journal   (Followers: 11, SJR: 0.479, CiteScore: 2)
Annals of Nuclear Medicine     Hybrid Journal   (Followers: 5, SJR: 0.687, CiteScore: 2)
Annals of Operations Research     Hybrid Journal   (Followers: 10, SJR: 0.943, CiteScore: 2)
Annals of Ophthalmology     Hybrid Journal   (Followers: 12)
Annals of Regional Science     Hybrid Journal   (Followers: 8, SJR: 0.614, CiteScore: 1)
Annals of Software Engineering     Hybrid Journal   (Followers: 13)
Annals of Solid and Structural Mechanics     Hybrid Journal   (Followers: 9, SJR: 0.239, CiteScore: 1)
Annals of Surgical Oncology     Hybrid Journal   (Followers: 15, SJR: 1.986, CiteScore: 4)
Annals of Telecommunications     Hybrid Journal   (Followers: 9, SJR: 0.223, CiteScore: 1)
Annals of the Institute of Statistical Mathematics     Hybrid Journal   (Followers: 1, SJR: 1.495, CiteScore: 1)
Antonie van Leeuwenhoek     Hybrid Journal   (Followers: 5, SJR: 0.834, CiteScore: 2)
Apidologie     Hybrid Journal   (Followers: 4, SJR: 1.22, CiteScore: 3)
APOPTOSIS     Hybrid Journal   (Followers: 9, SJR: 1.424, CiteScore: 4)
Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2, SJR: 0.294, CiteScore: 1)
Applications of Mathematics     Hybrid Journal   (Followers: 2, SJR: 0.602, CiteScore: 1)
Applied Biochemistry and Biotechnology     Hybrid Journal   (Followers: 44, SJR: 0.571, CiteScore: 2)
Applied Biochemistry and Microbiology     Hybrid Journal   (Followers: 18, SJR: 0.21, CiteScore: 1)
Applied Categorical Structures     Hybrid Journal   (Followers: 4, SJR: 0.49, CiteScore: 0)
Applied Composite Materials     Hybrid Journal   (Followers: 49, SJR: 0.58, CiteScore: 2)
Applied Entomology and Zoology     Partially Free   (Followers: 6, SJR: 0.422, CiteScore: 1)
Applied Geomatics     Hybrid Journal   (Followers: 3, SJR: 0.733, CiteScore: 3)
Applied Geophysics     Hybrid Journal   (Followers: 9, SJR: 0.488, CiteScore: 1)
Applied Intelligence     Hybrid Journal   (Followers: 13, SJR: 0.6, CiteScore: 2)
Applied Magnetic Resonance     Hybrid Journal   (Followers: 4, SJR: 0.319, CiteScore: 1)
Applied Mathematics & Optimization     Hybrid Journal   (Followers: 8, SJR: 0.886, CiteScore: 1)
Applied Mathematics - A J. of Chinese Universities     Hybrid Journal   (SJR: 0.17, CiteScore: 0)
Applied Mathematics and Mechanics     Hybrid Journal   (Followers: 5, SJR: 0.461, CiteScore: 1)
Applied Microbiology and Biotechnology     Hybrid Journal   (Followers: 66, SJR: 1.182, CiteScore: 4)
Applied Physics A     Hybrid Journal   (Followers: 10, SJR: 0.481, CiteScore: 2)
Applied Physics B: Lasers and Optics     Hybrid Journal   (Followers: 24, SJR: 0.74, CiteScore: 2)
Applied Psychophysiology and Biofeedback     Hybrid Journal   (Followers: 8, SJR: 0.519, CiteScore: 2)
Applied Research in Quality of Life     Hybrid Journal   (Followers: 12, SJR: 0.316, CiteScore: 1)
Applied Solar Energy     Hybrid Journal   (Followers: 22, SJR: 0.225, CiteScore: 0)
Applied Spatial Analysis and Policy     Hybrid Journal   (Followers: 7, SJR: 0.542, CiteScore: 1)
Aquaculture Intl.     Hybrid Journal   (Followers: 26, SJR: 0.591, CiteScore: 2)
Aquarium Sciences and Conservation     Hybrid Journal   (Followers: 2)
Aquatic Ecology     Hybrid Journal   (Followers: 37, SJR: 0.656, CiteScore: 2)
Aquatic Geochemistry     Hybrid Journal   (Followers: 4, SJR: 0.591, CiteScore: 1)
Aquatic Sciences     Hybrid Journal   (Followers: 14, SJR: 1.109, CiteScore: 3)
Arabian J. for Science and Engineering     Hybrid Journal   (Followers: 5, SJR: 0.303, CiteScore: 1)
Arabian J. of Geosciences     Hybrid Journal   (Followers: 2, SJR: 0.319, CiteScore: 1)
Archaeological and Anthropological Sciences     Hybrid Journal   (Followers: 21, SJR: 1.052, CiteScore: 2)
Archaeologies     Hybrid Journal   (Followers: 12, SJR: 0.224, CiteScore: 0)
Archiv der Mathematik     Hybrid Journal   (Followers: 1, SJR: 0.725, CiteScore: 1)
Archival Science     Hybrid Journal   (Followers: 66, SJR: 0.745, CiteScore: 2)
Archive for History of Exact Sciences     Hybrid Journal   (Followers: 7, SJR: 0.186, CiteScore: 1)
Archive for Mathematical Logic     Hybrid Journal   (Followers: 3, SJR: 0.909, CiteScore: 1)
Archive for Rational Mechanics and Analysis     Hybrid Journal   (SJR: 3.93, CiteScore: 3)
Archive of Applied Mechanics     Hybrid Journal   (Followers: 6, SJR: 0.79, CiteScore: 2)
Archives and Museum Informatics     Hybrid Journal   (Followers: 157, SJR: 0.101, CiteScore: 0)
Archives of Computational Methods in Engineering     Hybrid Journal   (Followers: 6, SJR: 1.41, CiteScore: 5)
Archives of Dermatological Research     Hybrid Journal   (Followers: 7, SJR: 1.006, CiteScore: 2)
Archives of Environmental Contamination and Toxicology     Hybrid Journal   (Followers: 14, SJR: 0.773, CiteScore: 2)
Archives of Gynecology and Obstetrics     Hybrid Journal   (Followers: 17, SJR: 0.956, CiteScore: 2)
Archives of Microbiology     Hybrid Journal   (Followers: 9, SJR: 0.644, CiteScore: 2)
Archives of Orthopaedic and Trauma Surgery     Hybrid Journal   (Followers: 9, SJR: 1.146, CiteScore: 2)
Archives of Osteoporosis     Hybrid Journal   (Followers: 2, SJR: 0.71, CiteScore: 2)
Archives of Sexual Behavior     Hybrid Journal   (Followers: 10, SJR: 1.493, CiteScore: 3)
Archives of Toxicology     Hybrid Journal   (Followers: 17, SJR: 1.541, CiteScore: 5)
Archives of Virology     Hybrid Journal   (Followers: 5, SJR: 0.973, CiteScore: 2)
Archives of Women's Mental Health     Hybrid Journal   (Followers: 16, SJR: 1.274, CiteScore: 3)
Archivio di Ortopedia e Reumatologia     Hybrid Journal  
Archivum Immunologiae et Therapiae Experimentalis     Hybrid Journal   (Followers: 2, SJR: 0.946, CiteScore: 3)
ArgoSpine News & J.     Hybrid Journal  
Argumentation     Hybrid Journal   (Followers: 6, SJR: 0.349, CiteScore: 1)
Arid Ecosystems     Hybrid Journal   (Followers: 2, SJR: 0.2, CiteScore: 0)
Arkiv för Matematik     Hybrid Journal   (Followers: 2, SJR: 0.766, CiteScore: 1)
Arnold Mathematical J.     Hybrid Journal   (Followers: 1, SJR: 0.355, CiteScore: 0)
Arthropod-Plant Interactions     Hybrid Journal   (Followers: 2, SJR: 0.839, CiteScore: 2)
Arthroskopie     Hybrid Journal   (Followers: 1, SJR: 0.131, CiteScore: 0)
Artificial Intelligence and Law     Hybrid Journal   (Followers: 11, SJR: 0.937, CiteScore: 2)
Artificial Intelligence Review     Hybrid Journal   (Followers: 18, SJR: 0.833, CiteScore: 4)
Artificial Life and Robotics     Hybrid Journal   (Followers: 9, SJR: 0.226, CiteScore: 0)
Asia Europe J.     Hybrid Journal   (Followers: 5, SJR: 0.504, CiteScore: 1)
Asia Pacific Education Review     Hybrid Journal   (Followers: 13, SJR: 0.479, CiteScore: 1)
Asia Pacific J. of Management     Hybrid Journal   (Followers: 16, SJR: 1.185, CiteScore: 2)
Asia-Pacific Education Researcher     Hybrid Journal   (Followers: 13, SJR: 0.353, CiteScore: 1)
Asia-Pacific Financial Markets     Hybrid Journal   (Followers: 3, SJR: 0.187, CiteScore: 0)
Asia-Pacific J. of Atmospheric Sciences     Hybrid Journal   (Followers: 19, SJR: 0.855, CiteScore: 1)
Asian Business & Management     Hybrid Journal   (Followers: 9, SJR: 0.378, CiteScore: 1)
Asian J. of Business Ethics     Hybrid Journal   (Followers: 10)
Asian J. of Criminology     Hybrid Journal   (Followers: 6, SJR: 0.543, CiteScore: 1)
AStA Advances in Statistical Analysis     Hybrid Journal   (Followers: 4, SJR: 0.548, CiteScore: 1)
AStA Wirtschafts- und Sozialstatistisches Archiv     Hybrid Journal   (Followers: 5, SJR: 0.183, CiteScore: 0)
ästhetische dermatologie & kosmetologie     Full-text available via subscription  
Astronomy and Astrophysics Review     Hybrid Journal   (Followers: 22, SJR: 3.385, CiteScore: 5)

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Similar Journals
Journal Cover
Insectes Sociaux
Journal Prestige (SJR): 0.918
Citation Impact (citeScore): 2
Number of Followers: 3  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1420-9098 - ISSN (Online) 0020-1812
Published by Springer-Verlag Homepage  [2352 journals]
  • Natural history and ecology of fungus-farming ants: a field study in
           Atlantic rainforest
    • Abstract: Ants in the subtribe Attina belong to a monophyletic group, exclusive to the New World, that contains approximately 250 described species. All attine ants have a mutualistic relationship with the fungus they cultivate as food source. The present study provides a natural history and ecological account of five species of fungus-farming ants in the Brazilian Atlantic rainforest: Mycocepurus smithii, Mycetarotes parallelus, Mycetophylax morschi, Sericomyrmex parvulus, and Sericomyrmex saussurei. Specifically, we investigated nesting and foraging behavior and daily activity rhythms, and identified the substrates collected for fungiculture. Nests of all five ant species studied consist of chambers excavated in the soil, with variation on external appearance from inconspicuous holes in the ground to entrances surrounded by mounds of excavated soil pellets. S. saussurei was mainly nocturnal, M. morschi was active all day, and the other species presented diurnal activity. All species foraged exclusively on the ground and near their nests. All five species collected substrates of animal origin (mainly arthropod feces) and vegetable matter on which to cultivate their fungus gardens. Data on basic biological features of these ants, which represent phylogenetically diverse lineages, contribute to a better understanding of their mutualistic relationships with their fungal symbionts and of the evolutionary processes that produced the derived characteristics in the subtribe Attina. Additionally, this study adds to our knowledge of the natural history of fungus-farming ants in Atlantic rainforest and increases our understanding of their roles in this threatened biome.
      PubDate: 2019-03-22
       
  • Hybridization in the European carpenter ants Camponotus herculeanus and C.
           ligniperda (Hymenoptera: Formicidae)
    • Abstract: The first case of hybridization between the large European carpenter ants Camponotus herculeanus (Linnaeus 1758) and C. ligniperda (Latreille 1802) is demonstrated by means of exploratory and hypothesis-driven data analyses of standardized phenotypic characters. The strong signal separating the parental species allows the identification of hybrid workers on the individual level, based on only seven characters. The frequency of hybridization between the two species is estimated for Central Europe as 0.2–1.0%. This low ratio indicates strong reproductive barriers considering syntopic occurrence at about 10% of the observation sites, a nearly complete overlap of swarming times and basically equal meteorological conditions to release swarming. The presented case increases the known ratio of hybridizing species within the 178 ant species of Central Europe to 19.1%. This figure dramatically contrasts the known hybridization ratio of 0.55% within an estimated number of 2000 ant species from the Holarctic outside Central Europe. This 30-fold lower discovery rate of hybrids may be explained by the predominance of idiosyncratic species delimitation methods in morphology-based taxonomy in combination with the psychology of human decision-making. A neotype of Camponotus ligniperda is fixed in a specimen from the terra typica and comments on the Latin naming are given.
      PubDate: 2019-03-12
       
  • The effect of ground surface rugosity on ant running speed is
           species-specific rather than size dependent
    • Abstract: Foraging is one of the main reasons for ants to walk. Foraging speed is mainly dependent on morphological traits, but also on the surface structure. The size-grain hypothesis (SGH) suggests that (1) relative leg length should increase allometrically with body size, and (2) smaller, shorter legged species have an advantage with increasing habitat complexity in comparison to larger and longer legged species. In general, it is thought that leg length is a good predictor for running speed. We performed morphological analyses and running experiments with differently sized ant species along an artificial gradient of surface rugosity. We measured running speed, number of steps, body size and leg length to answer the question, if morphological traits can be used to predict the running speed of ants in complex habitats, as predicted by the SGH. We found that (1) leg length increased allometrically with body size, and that (2) the largest species were among the fastest and could sustain their speed with increasing surface rugosity. The smallest species with the relatively shortest legs were the fastest on the flattest surface, but their speed decreased rapidly with increasing rugosity. Leg length was not a good predictor for running speed. Similar-sized species responded idiosyncratically to high surface rugosity, which might be related to species-specific habitat preferences. Species-specific behavior or stride frequency influenced running speed strongly, which hampers precise predictions on their running speed, based on morphological traits exclusively.
      PubDate: 2019-03-07
       
  • Ants in isolation: obstacles to testing worker responses to task stimuli
           outside of the colony context
    • Abstract: In social insects, division of labor is commonly thought to be driven by differences among workers in their sensitivity, or response thresholds, to task-related stimuli. Despite the wide use of this mechanism throughout social insect research, actual empirical evidence for these thresholds is comparatively scarce. Here, we attempt to fill this empirical gap by testing individual task stimulus response thresholds, their consistency over time, and their relation to behavior in Temnothorax rugatulus ants. We also explored morphological differences in the antenna as one potential neural mechanism generating differences in sensitivity, and thus response threshold variation, across workers. Ants were exposed to different amounts of hungry brood, fungal spores, or sugar— stimuli that appear to drive brood care, grooming, and foraging behavior, respectively. Our measures of response thresholds were not repeatable across two trials for any of the three tested stimuli. In addition, responses to different stimulus intensities (possible response thresholds) were not associated with worker task allocation in the colony with the exception of brood care, in which case the results directly contradicted what the response threshold hypothesis predicts. Workers from different task groups also did not differ in their latency to respond to these stimuli or in the duration of their response. Sensilla density varied across workers but did not predict our measures of response thresholds to any of the tested stimuli. Though this is not what the response threshold hypothesis would have predicted, it is possible that testing ants in isolation may not accurately reflect their behavior in the colony, or that sensitivity to a task stimulus, alone, is not sufficient for driving division of labor. We suggest approaches to testing response thresholds that incorporate the roles of social context and competing task stimuli.
      PubDate: 2019-03-07
       
  • Host following of an ant associate during nest relocation
    • Abstract: Ant nests are relatively stable and long-lasting microhabitats that attract a diverse group of arthropods. Particular stressors, however, can trigger ants to relocate their nest to a new site. It is unclear how associated arthropods respond to occasional nest moving of their host. Here, I report field observations which showed that the potentially parasitic larvae of the beetle Clytra quadripunctata follow their red wood ant host during nest relocation, either by crawling on their own or by being carried by the host workers. These observations shed new light on the spatial dynamics between ants and their associates.
      PubDate: 2019-02-23
       
  • Beyond temporal-polyethism: division of labor in the eusocial bee Melipona
           marginata
    • Abstract: Division of labor plays a fundamental role in colony organization in social insects. In many species, division of labor is based on temporal behavioral castes, whereby workers change tasks as they age. However, division of labor remains relatively poorly understood in the large and diverse group of stingless bees (Meliponini), particularly in the largest and economically important genus Melipona. Recent research suggests that stingless bees can differ considerably from other eusocial bees in their division of labor. Here, we studied the lifetime task performance of individually marked workers of the Brazilian species Melipona marginata. We found that colony organization in M. marginata is characterized by temporal castes and a tendency for elitism, i.e. positive performance correlations across the major tasks. Additionally, we also found that individual workers differ considerably in their work profiles and overall effort. A cluster analysis found evidence for a group of workers that are particularly active in wax manipulation and cell building, two behaviors that are linked to the provisioning and oviposition process (POP). Remarkably, the majority of bees (59%) were never seen foraging and non-foragers were characterized by fewer trophallaxes and less grooming during their lifetime. Bees that did forage often specialized in collecting particular resources, e.g. pollen and mud collectors. In summary, our results suggest that the colony organization in M. marginata is complex and includes temporal castes, elitism across some tasks and specialization in others.
      PubDate: 2019-02-23
       
  • When and how obstacle size and the number of foragers affect clearing a
           foraging trail in leaf-cutting ants
    • Abstract: Taking bad decisions to solve problems can negatively affect organism fitness, hence, the costs accrued by them should modulate decisions about when and how problems should be solved. We studied the problem of trail maintenance in leaf-cutting ants. We evaluated whether colonies have individuals exclusively dedicated to trail maintenance, and how obstacle size and ant forager flux influence the decision of removing obstacles, and the number of trail-clearing ants. We placed obstacles of different sizes, in low and high ant fluxes in different trails of Atta sexdens, and measured ant flux without and with obstacles, if ants removed obstacles, the number of trail-clearing ants and removal time. Obstacle cost was estimated as the proportion of ants that were blocked by the obstacle. We found that colonies lack exclusive trail-clearing ants, i.e., clearing ants also foraged and vice versa. The obstacle cost increased with obstacle size and ant flux. Removal probability increased with this cost. The number of trail-clearing ants increased with obstacle size but did not vary with ant flux, suggesting that the number of trail-clearing ants depends on intrinsic problem characteristics (i.e., higher resistance to traction in bigger obstacles), but does not depend on social context (i.e., interference with foragers). Regardless of the obstacle size, the removal time increased with the number of trail-clearing ants suggesting that interference among individuals is higher in larger working groups than in smaller ones. Our results suggest that individual capabilities as well as the coordination level among individuals influence the solving of a problem and the number of individuals involved in it. We discuss possible mechanisms behind results and propose a conceptual model about the costs and benefits of the removal task.
      PubDate: 2019-02-20
       
  • Insectes Sociaux best paper 2018
    • PubDate: 2019-02-01
       
  • First records of presocial behavior of Montezumia brethesi Bertoni, 1918
           (Hymenoptera, Vespidae, Eumeninae)
    • Abstract: Montezumia Saussure is a genus of mason wasps with diverse nesting habits that occurs in the New World. Although all make nests of mud, these can be built as pots above ground or within galleries. Here, observations on nesting and provisioning in M. brethesi are made for the first time and strongly suggest communal nesting. This agrees with previous observations on M. cortesioides, but contrasts with reports from M. pelagica, a supposedly closely related species.
      PubDate: 2019-02-01
       
  • Socially polymorphic bees as model organisms for studying the evolution of
           eusociality
    • PubDate: 2019-02-01
       
  • Are societies resilient' Challenges faced by social insects in a
           changing world
    • Abstract: Social insects are considered to be highly successful and ecologically dominant because they comprise the majority of insect biomass in many ecosystems. One key to the success of social insects is their highly coordinated and organized behavior, which allows them to more efficiently exploit resources. However, as our world undergoes dramatic global changes, such as climate change, deforestation, and the introduction of invasive species, the very traits that have provided evolutionary advantages may become liabilities for some social insect species. Here we propose that some social traits, which are conventionally thought to be beneficial, will be detrimental in the context of rapid environmental change. We focus on four fundamental aspects of complex insect societies (coordination of cooperative behavior, worker caste organization, social immunity, and ecosystem engineering) and make predictions about how social lifestyles may become compromised in the face of ecological adversity. We intend to bring attention to the unique vulnerabilities of social insects and propose novel avenues of research to better illuminate the consequences of global change for social insects.
      PubDate: 2019-02-01
       
  • An improved method for testing invertebrate encapsulation response as
           shown in the honey bee
    • Abstract: In 1882, Metchnikoff documented the encapsulation response (ER) of the invertebrate immune system. Since then, researchers have used Metchnikoff’s method to quantify immune function—and examine its relationship with ecological and behavioral factors—across various insect taxa. While scientists continue to uncover information regarding invertebrate immunity, behavioral ecology, and ecological immunology, the basics of Metchnikoff’s method have remained unchanged. All but two previous studies investigating insect immunity have used sterile or PBS-coated inducers, although we know that the immune system recognizes specific pathogens. To account for the specificity of the immune system, we modified Metchnikoff’s method and coated nylon monofilaments with pathogen-associated molecular patterns (PAMPs). Using honey bees (Apis mellifera), we examined ER using implants coated with PAMPs (“PAMPlants”) found on known honey bee parasites and pathogens. Lipopolysaccharide (LPS), peptidoglycan (PGN), and β-1, 3-glucan (B13G) PAMPlants mimicked an infection with Gram-negative bacteria, Gram-positive bacteria, and fungi, respectively. Our PAMPlants induced stronger responses than the control implants in both singly- (one PBS-coated or PAMP-coated implant) and doubly- (internal control; one PBS-coated and one PAMP-coated implant) implanted animals. In doubly-implanted individuals, there was a significant increase in response to B13G and LPS when compared with internal controls. The PGN and BSA did not differ from the internal controls in the doubly implanted individuals. These methods provide an improvement when exploring responses to specific pathogens and exploring topics within the field of invertebrate ecological immunity. When applied to social systems, these methods can be used to examine the evolution of disease resistance in societies.
      PubDate: 2019-02-01
       
  • Cannibalism associated with artificial wounds on the bodies of
           Reticulitermes speratus workers and soldiers (Isoptera: Rhinotermitidae)
    • Abstract: We investigated the cannibalism and its association with cannibalistic grooming in Reticulitermes speratus (Kolbe), first by observing workers’ cannibalistic behavior against workers artificially wounded on different body parts. Almost all the wounded thoraces and abdomina were eaten, while in some of the abdomen-wounded individuals, nestmates’ cannibalism extended from the abdomen to the thorax, and thorax was cannibalistically attacked in all the abdomen-wounded individuals. In thorax-wounded individuals cannibalistic damage mostly extended from the thorax to the abdomen to a lesser degree. In the assessments of the frequencies and durations of the cannibalistic groomings toward different body parts, the wounded individuals, upon being groomed, occasionally exhibited vibrational behavior, and its frequencies upon the groomings toward wounded body parts were significantly higher than those toward non-wounded body parts. Vibration significantly reduced the duration of cannibalistic grooming on the wounded head and abdomen, while it reduced the grooming frequency and did not reduce the duration of grooming on wounded thorax. These results suggest that the vibration serves as a vital sign or death-negative factor in death recognition. A feeding experiment with workers’ cuticular hydrocarbon extract showed that it did not promote cannibalistic behavior. A feeding experiment with filter papers impregnated with different body part extracts showed that all the extracts exhibited phagostimulant activity, with workers’ body extracts resulting in significantly higher quantity of consumption than in soldiers’ except abdomen. Further assay revealed a stronger activity of labial gland compared to the labial gland-removed thorax, suggesting the key role of labial gland in cannibalism.
      PubDate: 2019-02-01
       
  • Nesting and distribution of Trachymyrmex holmgreni in Brazilian restinga
    • Abstract: The genus Trachymyrmex falls within an intermediate behavior between the “leaf-cutters” and “non-cutters” fungus-farming ants, since they can use both fresh cut and detritus as a substrate to grow symbiotic fungus. In addition to this behavior, the genus Trachymyrmex falls in an intermediate phylogenetic position in recent molecular and phylogenomic studies. These aspects make the study of the natural history of the Trachymyrmex species interesting in terms of understanding the steps in the evolution of fungus agriculture. Thus, the objective of this study was to describe the nest architecture, colony demography as well as the distribution pattern of the fungus-farming ant Trachymyrmex holmgreni colonies in the Restinga ecosystem. Our results allowed us to suggest that the architecture and demography of the nest varied between seasons. Surprisingly, in the autumn, the nest presented three fungus chambers and many winged ants, while in the spring, there were five fungus chambers and a significant number of immature individuals. These results indicate that T. holmgreni seems to invest in reproduction during the autumn and establishes new nests during the winter, which promotes growth during the spring and summer. In addition, we found an aggregate distribution pattern of the nests, suggesting that abiotic factors such as resource availability and microclimatic soil conditions probably interfered with the successful establishment of the colonies. We concluded that the demography and architecture of the nest reaffirmed the intermediate position of the genus and corroborated the hypothesis that the evolution of small to large nests went through intermediate sizes.
      PubDate: 2019-02-01
       
  • The digging dynamics of ant tunnels: movement, encounters, and nest space
    • Abstract: Underground ant nests are constructed by decentralised self-organisation wherein the ants respond to local stimuli and produce coordinated structures through globally regulated behaviours. One such regulation is the reduction in digging effort that occurs when available nest space has reached an adequate size. Tunnels have a distinct configuration relative to other nest elements and the processes regulating their excavation are poorly understood. We examined the relationship between digging effort and tunnel space by presenting groups of 10 Acromyrmex lundi workers with either short or long tunnel spaces and demonstrated that they will dig significantly less over time in a tunnel that is already long compared to one that is short. Additionally, we provided the same treatment to groups of 100 workers and found no significant effect of length, suggesting that group size has an important impact on tunnel excavation dynamics. Automated tracking was then used to examine tunnel digging in greater detail. Groups of 10 Atta colombica ants were tracked while excavating sand in a tunnel apparatus. There was a significant correlation between mean walking speed and excavation rate. Additionally, the ants would maintain a consistent level of proximity with each other over time. This suggests that as tunnel space expands, several factors combine to lower the chance of ants encountering the tunnel digging face and taking up excavation.
      PubDate: 2019-02-01
       
  • Termite environmental tolerances are more linked to desiccation than
           temperature in modified tropical forests
    • Abstract: Termites are vital members of old-growth tropical forests, being perhaps the main decomposers of dead plant material at all stages of humification (decay). Termite abundance and diversity drop in selectively logged forest, and it has been hypothesised that this drop is due to a low tolerance to changing micro-climatic conditions. Specifically, the thermal adaptation hypothesis suggests that tropical species are operating at, or close to, their thermal optimum, and therefore, small temperature increases can have drastic effects on abundance, however, other climatic variables such as humidity might also cause termite abundance to drop. We tested termite tolerance to these two climatic variables (temperature and humidity). We found that termites had a higher CTmax than expected, and that three traits, feeding group, body sclerotisation, and nesting type, were significantly correlated with CTmax. We found that termite desiccation tolerance was low, however, and that all termite genera lost significantly more water in a desiccated environment than in a control. Body sclerotisation, the only trait that was tested, was surprisingly not significantly correlated with desiccation tolerance. Our results suggest that desiccation, rather than ambient temperature, may be the determining factor in dictating termite distributions in modified forests. Should climate change lead to reduced humidity within tropical rainforests, termite abundances and the rates of the functions they perform could be severely reduced.
      PubDate: 2019-02-01
       
  • An improved approach for the collective construction of architectures
           inspired by wasp nests
    • Abstract: We present in this article, a new decentralized algorithmic approach for the automatic construction of three-dimensional structure based on simple behavioral rules. This model is an improvement of the model introduced by Eric Bonabeau and Guy Theraulaz to simulate the process of building wasps’ nest. To speed up the construction process, and to prevent the builder swarm from moving far away from regions with stimuli to build, we constructed a dynamic envelope that limits agents’ movements to remain close to the built structure. The envelope adjusts both as the structure develops and as agents assess whether individual sites should be built in, or not. The use of such an envelope results in faster construction and gives an explicit method for terminating a simulation when no buildable sites remain, thus indicating that a structure has converged to its final form.
      PubDate: 2019-02-01
       
  • Why do Acromyrmex nests have thatched entrance structures' Evidence
           for use as a visual homing cue
    • Abstract: Ants can learn to recognize and memorize visual aspects around their nests for visual guidance. Thatched entrance structures are a trademark of the genus Acromyrmex. We hypothesized that the thatched structure serves as a visual cue for Acromyrmex balzani workers while homing. Fifteen colonies located in a pasture area were used to test whether thatched structure displacement and odor removal alter the behavior of returning ants. Nests were divided into three groups: (1) control observations, (2) displaced thatched structure, which we moved 30 cm to the right side of the nest entrance and (3) displaced and odorless thatched structure. Route direction and time spent by five workers to reach the nest entrance were measured. For manipulated nests, workers were disoriented and took longer to reach the nest entrance relative to control colonies. These results are in accordance with the idea that environmental alterations may influence ant navigational abilities and suggest that A. balzani workers can perceive recent modifications around the nest while homing. The observed disorientation by workers in response to the displaced and odorless thatched entrance suggests that it can act as visual cue to homing behavior of A. balzani. Future researches manipulating thatched structure and chemical cues around the nest entrance may generate knowledge about the importance of both types of cue for navigation in ants.
      PubDate: 2019-02-01
       
  • The influence of sociality, caste, and size on behavior in a facultatively
           eusocial bee
    • Abstract: Social cooperation requires increased tolerance of other individuals. We used social and solitary individuals of the facultatively eusocial bee Megalopta genalis to compare interactions with non-nestmate individuals in a standardized behavioral assay, a circle tube. We set up interactions between bees from different nests matched for caste (solitary, social: queen or worker). We found more tolerance in social than solitary pairs, but found no difference in aggression. We also found that workers continued expressing caste-typical behavior even when matched against other workers from different nests. However, there was no difference in expression of queen-typical behaviors between the three groups. Our data on social caste show that outside of the queen–worker social context, both queens and workers express similar levels of queen-like behavior. However, workers still express higher levels of worker-like behavior than do queens. We found no effect of variation in ovary size on behavior. We found that body size correlated positively with queen-like behaviors, and negatively with worker-like behaviors. Our body size data suggest that the worker phenotype may result from naturally occurring size-correlated variation in behavior, combined with maternal manipulation of both body size through nutrition and behavior and ovary development through social aggression.
      PubDate: 2019-02-01
       
  • Royal jelly in focus
    • Abstract: Honey bee (Apis spp.) royal jelly, a glandular secretion used to raise young larvae to future queens, has long been considered merely as food. Since queen larvae are raised upside down in their vertically oriented queen cells, royal jelly also needs to adhere the larvae to the cell ceiling to prevent the prospective queen from dropping out. This is exactly where the native acidic pH of royal jelly comes into play: only at a pH of 4.0 is royal jelly viscous enough to hold the larvae in their cells. We here show with the help of electron microscopy that royal jelly possesses a complex tissue-like organization at pH 4.0 which is similar to the dense extracellular matrix of animals providing structural support. The main structural elements at pH 4.0 are proteinaceous fibril bundles, embedded in a fibrillary net, that seem to be bunched in electron-dense structures, potential sites of fibril overlap and cross-linking. At an exogenously induced increased royal jelly pH of 7.0, these fibrillary structures are largely destroyed. This is when royal jelly viscosity decreases and holding the queen larvae in place is no longer guaranteed.
      PubDate: 2019-02-01
       
 
 
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