JournalTOCs

Acta Ichthyologica et Piscatoria
Journal Prestige (SJR): 0.303

Citation Impact (citeScore): 1
Number of Followers: 5

This is an Open Access Journal

Open Access journal
ISSN (Print) 0137-1592 - ISSN (Online) 1734-1515
Published by Pensoft

[58 journals]

Length–weight relations for 19 freshwater fish species
(Actinopterygii) from the lowland Elbe River, Germany
- Abstract: Acta Ichthyologica et Piscatoria 53: 129-135
  DOI : 10.3897/aiep.53.107199
  Authors : Janek Simon, Wolf-Christian Lewin, Erik Fladung : Monthly and mean length–weight relations (LWRs) were calculated for 19 freshwater fish species from the middle section of the lowland Elbe River (Germany): Abramis brama (Linnaeus, 1758); Alburnus alburnus (Linnaeus, 1758); Anguilla anguilla (Linnaeus, 1758); Ballerus ballerus (Linnaeus, 1758); Blicca bjoerkna (Linnaeus, 1758); Cobitis taenia Linnaeus, 1758; Esox lucius Linnaeus, 1758; Gobio gobio (Linnaeus, 1758); Gymnocephalus cernua (Linnaeus, 1758); Leuciscus aspius (Linnaeus, 1758); Leuciscus idus (Linnaeus, 1758); Leuciscus leuciscus (Linnaeus, 1758); Lota lota (Linnaeus, 1758); Perca fluviatilis Linnaeus, 1758; Romanogobio albipinnatus (Lukasch, 1933); Rutilus rutilus (Linnaeus, 1758); Sander lucioperca (Linnaeus, 1758); Scardinius erythrophthalmus (Linnaeus, 1758); and Squalius cephalus (Linnaeus, 1758). The values of the exponent b in the LWR W = aTLb ranged from 2.882 (Lota lota) to 3.517 (Cobitis taenia) and the correlation coefficient (r2) was greater than 0.96 for all species except for Cobitis taenia with 0.93. The relations allow for the accurate estimation of weight from length data with reduced handling times of fish in the field while enabling comparisons with other regions and future studies. The calculated LWRs together with species-specific abundance and catch data will be useful for fisheries modeling and estimating population status and related fish species protection, especially for the endangered species in the Elbe River. HTML XML PDF
  PubDate: Fri, 8 Sep 2023 08:56:05 +0300
First record of Mastacembelus notophthalmus (Actinopterygii:
Synbranchiformes: Mastacembelidae) for Belitung Island, Indonesia
- Abstract: Acta Ichthyologica et Piscatoria 53: 123-127
  DOI : 10.3897/aiep.53.105318
  Authors : Veryl Hasan, Lucas O. Vieira, Josie South, Felipe P. Ottoni : This study was conducted aiming to record for the first time the occurrence of Mastacembelus notophthalmus Roberts, 1989 in Belitung Island (Indonesia), and update the geographic distribution of this species. Although this species is categorized as LC according to the IUCN Red List, it is rarely reported in fish inventories, with few specimens sampled. Moreover, data on the geographic distribution, population size, and other population details of M. notophthalmus are scarce and insufficient to predict possible threats and propose appropriate conservation measures and policies. A single specimen of Mastacembelus was collected using a fish trap on 20 February 2023, in a swamp, located in the middle course of the Lenggang River, Belitung Island, Indonesia. This specimen was identified as M. notophthalmus and this finding constitutes the southernmost record for this species, expanding its geographic range. In addition, the new record site is about 700 km south-east of the nearest locality in Peninsular Malaysia, about 250 km south-east of the nearest locality in Bangka Island, about 600 km south-east of the nearest locality in Sumatra, and about 500 km south-west from the nearest locality in Borneo. Better ecological and biological data concerning distribution, habitat, and stressors is crucial to reassess the conservation status of M. notophthalmus, and possible future conservation measures and policies. Therefore, we emphasize here the urgency for more comprehensive and accurate data to facilitate conservation assessments and management in Indonesia. HTML XML PDF
  PubDate: Fri, 14 Jul 2023 19:39:38 +030
New records of ray-finned fishes (Actinopterygii) from Puerto Morelos
Reef National Park (Mexican Caribbean)
- Abstract: Acta Ichthyologica et Piscatoria 53: 107-122
  DOI : 10.3897/aiep.53.101239
  Authors : Francisco Martínez-Servín, Yareli Margarita López-Arroyo, Aurora Lizeth Moreno-Vázquez, D. Ross Robertson, Alfrancis Teresa Arredondo-Chávez, Juan Antonio Sánchez-Jiménez, Oscar Gabriel Ávila-Morales, Xavier Madrigal-Guridi, Jose Adan Caballero-Vázquez, Juan J. Schmitter-Soto, Omar Domínguez-Domínguez, María Gloria Solís-Guzmán : We documented the nearshore ray-finned fishes in Puerto Morelos Reef National Park (PMRNP) by sampling 57 localities, including rocky intertidal pools, sandy bottoms, Thalassia beds, coral reefs, artificial reefs, karstic-slab bottoms, demersal-pelagic areas, and sessile-Sargassum patches. We recorded seven species new to Caribbean Mexican waters and one hundred and six species new to the PMRNP, most of which are small cryptobenthic reef fish. The resultant checklist includes 349 species, and specimens of 285 of which (81.7%) have been deposited in an ichthyological museum collection. These include both voucher organisms and with tissue samples for genetic analysis. A comparison with inventories at other localities of the Greater Caribbean indicates that more targeted sampling for cryptobenthic and deep-reef fishes is needed to provide a complete inventory. We also comment on the local use of some species as fishery resources. HTML XML PDF
  PubDate: Fri, 23 Jun 2023 09:52:15 +030
Parasites as biological tags of divergence of black-striped pipefish,
Syngnathus abaster (Actinopterygii: Syngnathiformes: Syngnathidae),
populations in their natural and acquired range
- Abstract: Acta Ichthyologica et Piscatoria 53: 95-105
  DOI : 10.3897/aiep.53.103246
  Authors : Volodymyr Yuryshynets, Yuriy Kvach, Iryna Syniavska, Oleksandra Shevchenko, Yuliia Kutsokon : The presently reported study was intended to describe the current range of an Atlanto–Mediterranean fish, the black-striped pipefish, Syngnathus abaster Risso, 1827, in Ukrainian waters and to analyze biological tags (size parameters and parasites) of its different populations. The parasitological survey was carried at five different localities, including one marine site, two deltaic zones, and two localities in the middle Dnipro basin. The study provides comprehensive new data on parasites of the black-striped pipefish in Ukraine, with supporting data on its newly acquired freshwater range. A total of 21 parasite species (taxa) were revealed. Several parasite species were recorded for the first time on this host, i.e., Trichodinella epizootica (Raabe, 1950); Trypanosoma sp.; Bothriocephalus scorpii (Müller, 1776); Progrillotia dasyatidis Beveridge, Neifar et Euzet, 2004; Ophiotaenia europaea Odening, 1963; Cryptocotyle jejuna (Nicoll, 1907); Metorchis xanthosomus (Creplin, 1846); Tylodelphys clavata (von Nordmann, 1832); Holostephanus luehei Szidat, 1936; Contracaecum rudolphii Hartwich, 1964; Mothocya epimerica Costa in Hope, 1851; and Unionidae gen. sp. Formation of the species’ parasite component community depends entirely on environmental factors, with local parasite community features forming due to 1) presence of “marine” unicellular parasite species (ciliates) in marine localities (10‰–17‰ salinity) only, the community forming as a refraction of relative stenohalinity (Trichodina rectuncinata Raabe, 1958), findings of “marine” ciliate species in freshwater locations representing examples of successful osmoconformation (Trichodina partidisci Lom, 1962); or 2) presence of multicellular parasites in localities with abiotic/biotic conditions that allow completion of complex life cycles, such as those of trematodes (freshwater/marine mollusks as obligate first hosts) or cestodes (freshwater/marine invertebrates as intermediate hosts or marine/freshwater vertebrates as definitive hosts). HTML XML PDF
  PubDate: Mon, 12 Jun 2023 14:28:47 +030
New record of Chromis weberi (Actinopterygii: Ovalentaria:
Pomacentridae) from Jeju Island, southern Korea
- Abstract: Acta Ichthyologica et Piscatoria 53: 89-94
  DOI : 10.3897/aiep.53.103531
  Authors : Se Hun Myoung, Jung-Goo Myoung, Min-Su Woo, Maeng Jin Kim, Min Gu Kang, Joo Myun Park : Discovering tropical marine species outside of their distribution limits is important for evaluating the impact of climate change on marine ecosystems. One specimen (31.6 mm standard length) of a tropical fish, Chromis weberi Fowler et Bean, 1928, representing the family Pomacentridae, was first recorded from Jeju Island, Korea, on 8 December 2021. It was characterized by black posterior margins of the preopercle and opercle and black upper and lower lobes of the caudal fin. A specimen of this species collected from Munseom was distinguished from Chromis xanthura (Bleeker, 1854) based on distinct differences in the tips of the upper and lower caudal fin lobes, which are not black in C. xanthura. In addition, C. weberi was easily distinguished from the other four species in the genus Chromis, by the mitochondrial DNA cytochrome c oxidase subunit I gene sequence (345 bp), with genetic distances ranging from 0.130 to 0.252. This study documents the first record of C. weberi in temperate Korean waters, implying a poleward range expansion for this species. The Korean name ‘geom-eun-jeom-ggo-ri-ja-ri-dom’ has been proposed for C. weberi. HTML XML PDF
  PubDate: Tue, 6 Jun 2023 17:45:20 +0300
Microfibers in the gut of invasive armored catfish (Pterygoplichthys spp.)
(Actinopterygii: Siluriformes: Loricariidae) in an urban lake in the
floodplain of the Grijalva River basin, Mexico
- Abstract: Acta Ichthyologica et Piscatoria 53: 81-88
  DOI : 10.3897/aiep.53.102643
  Authors : Gabriela Angulo-Olmos, Nicolás Álvarez-Pliego, Alberto J. Sánchez, Rosa Florido, Miguel Ángel Salcedo, Arturo Garrido-Mora, Allan K. Cruz-Rámirez : The intake of microplastics by freshwater fishes has been scarcely studied, and it is not yet clear whether the amount of particles these vertebrates ingest is associated with their feeding strategies. Hence, this study is focused on the suckermouth armored catfish (Pterygoplichthys spp.) under the hypothesis that, due to its detritivorous habits and demersal distribution, it may show evidence of the presence of microplastics in the sediments of a lake located in the Metropolitan Area of Villahermosa. A total of 21 organisms contained plastic microfibers throughout their digestive systems. These were treated with three solutions (hydrogen peroxide, potassium hydroxide, and sodium hypochlorite) to separate the microplastics. A total of 147 plastic particles of two categories were collected: microfibers (92%) and fragments (8%). Considering these results, as well as evidence in the literature, these species may constitute a global indicator of the incorporation into the trophic chain of microfibers deposited in the sediments of freshwater ecosystems. HTML XML PDF
  PubDate: Fri, 26 May 2023 14:45:31 +030
Estimation of selectivity parameters for target and bycatch fishes of the
trammel net fisheries in the northern Aegean Sea (eastern Mediterranean
Sea)
- Abstract: Acta Ichthyologica et Piscatoria 53: 65-80
  DOI : 10.3897/aiep.53.103358
  Authors : Angeliki Adamidou, Konstantinos Touloumis, Manos Koutrakis, Athanassios C. Tsikliras : The size selectivity of trammel nets was investigated in the northern Aegean Sea using 10 different inner-panel mesh sizes ranging from 16 to 70 mm nominal mesh size (bar length). Selectivity estimates were made for the eight most abundant target and bycatch fish species, namely black scorpionfish, Scorpaena porcus Linnaeus, 1758; annular seabream, Diplodus annularis (Linnaeus, 1758); red mullet, Mullus barbatus Linnaeus, 1758; surmullet, Mullus surmuletus Linnaeus, 1758; round sardinella, Sardinella aurita Valenciennes, 1847; European hake, Merluccius merluccius (Linnaeus, 1758); greater weever, Trachinus draco Linnaeus, 1758; and blotched picarel, Spicara flexuosum Rafinesque, 1810, which accounted for 51.5% by number and 42.7% by weight of the fish caught with trammel nets in the sea trials. The SELECT method was used to estimate the selectivity parameters. Five different selectivity functions (i.e., normal scale, normal location, gamma, log-normal, and bi-normal) were applied with the bi-normal function providing the best fit as it had the lowest deviance value for all species and the lowest values for the dispersion parameter (D/df). The mesh size of 16 mm in most of the cases retained specimens below the size at first maturity (Lm). The mesh size of 19 mm seems more appropriate for red mullet, surmullet, and blotched picarel, the mesh size of 22 mm for annular seabream and round sardinella, while for European hake and black scorpionfish, the mesh size larger than 26 mm would be more appropriate. HTML XML PDF
  PubDate: Tue, 23 May 2023 15:37:53 +030
Length–weight relations of 39 continental-shelf and deep-water fishes
(Actinopterygii) from northwestern Gulf of México
- Abstract: Acta Ichthyologica et Piscatoria 53: 59-64
  DOI : 10.3897/aiep.53.101788
  Authors : Ariel A. Chi-Espínola, M. Eugenia Vega-Cendejas, J. Mirella Hernández De Santillana : Fishes from the northwestern Gulf of Mexico were surveyed during four oceanographic campaigns (February and October 2016, June and September 2017) using a shrimp trawl net and benthic sled net in 20 locations at depths that ranged from 43 to 3608 m. Length–weight relations (LWR) were estimated for 39 fish species (in alphabetical order): Bembrops gobioides (Goode, 1880); Centropristis philadelphica (Linnaeus, 1758); Chauliodus sloani Bloch et Schneider, 1801; Chlorophthalmus agassizi Bonaparte, 1840; Chloroscombrus chrysurus (Linnaeus, 1766); Citharichthys spilopterus Günther, 1862; Coelorinchus caelorhincus (Risso, 1810); Cyclopsetta chittendeni Bean, 1895; Cyclothone alba Brauer, 1906; Cyclothone braueri Jespersen et Tåning, 1926; Cyclothone pseudopallida Mukhacheva, 1964; Dibranchus atlanticus Peters, 1876; Epigonus pandionis (Goode et Bean, 1881); Fowlerichthys radiosus (Garman, 1896); Laemonema goodebeanorum Meléndez et Markle, 1997; Lagocephalus laevigatus (Linnaeus, 1766); Lepophidium brevibarbe (Cuvier, 1829); Lutjanus campechanus (Poey, 1860); Malacocephalus occidentalis Goode et Bean, 1885; Merluccius albidus (Mitchill, 1818); Micropogonias furnieri (Desmarest, 1823); Monolene sessilicauda Goode, 1880; Ogcocephalus declivirostris Bradbury, 1980; Peristedion greyae Miller, 1967; Porichthys plectrodon Jordan et Gilbert, 1882; Prionotus longispinosus Teague, 1951; Prionotus paralatus Ginsburg, 1950; Pristipomoides aquilonaris (Goode et Bean, 1896); Rhynchoconger flavus (Goode et Bean, 1896); Sardinella aurita Valenciennes, 1847; Saurida brasiliensis Norman, 1935; Sternoptyx diaphana Hermann, 1781; Symphurus diomedeanus (Goode et Bean, 1885); Synagrops bellus (Goode et Bean, 1896); Trachurus lathami Nichols, 1920; Trichiurus lepturus Linnaeus, 1758; Trichopsetta ventralis (Goode et Bean, 1885); Urophycis cirrata (Goode et Bean, 1896); Zalieutes mcgintyi (Fowler, 1952). The fish species studied represented 28 families (in alphabetical order): Antennariidae, Batrachoididae, Bembropidae, Bothidae, Carangidae, Chlorophthalmidae, Congridae, Cyclopsettidae, Cynoglossidae, Dorosomatidae, Epigonidae, Gonostomatidae, Lutjanidae, Macrouridae, Merlucciidae, Moridae, Ogcocephalidae, Ophidiidae, Phycidae, Sciaenidae, Serranidae, Sternoptychidae, Stomiidae, Synagropidae, Synodontidae, Tetraodontidae Trichiuridae, Triglidae. A new maximum standard length (SL) was recorded for Cyclothone alba, C. braueri, C. pseudopallida, and Lepophidium brevibarbe. A positive allometric growth was reported in nine species, negative allometric growth in 16 species, and isometric growth in 14 species. HTML XML PDF
  PubDate: Tue, 23 May 2023 15:37:23 +030
A new record of Squalus montalbani (Chondrichthyes: Squaliformes:
Squalidae) from the Nansha (Spratly) Islands, South China Sea
- Abstract: Acta Ichthyologica et Piscatoria 53: 51-57
  DOI : 10.3897/aiep.53.103579
  Authors : Mengyi Zhang, Binbin Shan, Yan Liu, Liangming Wang, Changping Yang, Manting Liu, Qijian Xie, Dianrong Sun : The Indonesian greeneye spurdog (or a dogfish shark), Squalus montalbani Whitley, 1931, is widely distributed in the warm temperate to tropical waters of Indonesia, Philippines, the island of Taiwan, and Australia. Previous studies suggested that the distribution of dogfish shark species in the South China Sea is composed of two species, Squalus mitsukurii Jordan et Snyder, 1903 and Squalus brevirostris Tanaka, 1917. In March 2020 a dogfish shark specimen was collected from the Nansha (Spratly) Islands, South China Sea. We identified it as S. montalbani based on morphology and mitochondrial DNA barcoding. Our results confirmed the presence of S. montalbani in the South China Sea, leading us to conclude that it represents a new species record of the genus Squalus in the region. Furthermore, our findings demonstrate that the combined approach is highly effective in identifying Squalus species that share similar morphological characteristics. HTML XML PDF
  PubDate: Tue, 9 May 2023 12:57:03 +0300
Records of malformed sea catfishes (Ariopsis seemanni and Ariopsis
guatemalensis) (Actinopterygii: Siluriformes: Ariidae) off San Blas
(Mexican Pacific)
- Abstract: Acta Ichthyologica et Piscatoria 53: 45-49
  DOI : 10.3897/aiep.53.101350
  Authors : Felipe Guzmán-Morales, Angélica Yomira Ramos-Ávila, Mariana Díaz-Santana-Iturrios, Esperanza Granados-Amores, Jasmin Granados-Amores : Fish malformations can be an important hint for assessing the well-being of their populations and the quality of their habitats. Malformations have been observed in species of the order Siluriformes, including the family Ariidae. In this study, we report malformations in the blue sea catfish, Ariopsis guatemalensis (Günther, 1864), and the tete sea catfish, Ariopsis seemanni (Günther, 1864), collected in San Blas, Mexico. The malformations include missing eye, cleft lip, and malformed barbels. Such malformations could be blamed on substantial levels of pesticides in the environment, genetic factors, and/or a pathogenic effect of some parasites specific to the studied fish species. HTML XML PDF
  PubDate: Thu, 20 Apr 2023 11:13:48 +030
Reproductive biology of largescaled mullet, Parachelon grandisquamis
(Actinopterygii: Mugiliformes: Mugilidae), in the Marine Protected Area of
Niamone–Kalounayes (Casamance estuary, Senegal)
- Abstract: Acta Ichthyologica et Piscatoria 53: 37-43
  DOI : 10.3897/aiep.53.100933
  Authors : Patrick Diedhiou, Alassane Sarr, Ousseynou Samba, Modou Sene, Alexandre Langlais Bourassa, Waly Ndiaye : In Senegal, studies on the family Mugilidae are rare and little data is available on their reproductive biology. This study, carried out in the MPA of Niamone–Kalounayes (Casamance River estuary, Senegal) aims to enhance our knowledge of the reproductive biology of the largescale mullet, Parachelon grandisquamis (Valenciennes, 1836), a species highly prized by the local population as a food source. To better understand its reproductive biology, a series of monthly samplings over twelve (12) months from July 2021 to June 2022 was carried out. Experimental fisheries were carried out at six (6) stations located in secondary channels lined with mangroves, using a seine net (250 m long and 25 mm mesh side). A total of 361 individuals were sampled, including 321 female specimens and 40 male specimens. The calculated sex ratio was in favor of females (1:8), with a significant difference between the calculated sex ratio and the theoretical 1:1 sex ratio (χ2 = 218.73; P-value < 0.05). In the MPA of Niamone–Kalounayes, the breeding period of P. grandisquamis extends from March to July, from the end of the dry season up to the beginning of the wet season. The sizes at first sexual maturity were 17 cm in males and 18 cm in females, showing that in the MPA of Niamone–Kalounayes, males and females of P. grandisquamis reach sexual maturity at very close sizes (χ2 = 0.02; P> 0.05). As this species is subject to the intense fishery by many actors in the area, these findings may be proven useful in the process of developing a management plan for this particular species. HTML XML PDF
  PubDate: Thu, 20 Apr 2023 11:13:18 +030
The dominance of non-indigenous species in the catch composition of
small-scale fisheries: A case study from the Kaş–Kekova Special
Environmental Protection Area, Türkiye, Eastern Mediterranean
- Abstract: Acta Ichthyologica et Piscatoria 53: 27-35
  DOI : 10.3897/aiep.53.96788
  Authors : Fikret Öndes, Vahdet Ünal : This study aimed to determine the catch composition and compare the catch per unit effort (CPUE) of indigenous and non-indigenous species in longline and trammel net fisheries in the Mediterranean coasts of Türkiye. The data were collected weekly from May 2020 to September 2021 by commercial fishing vessels (n = 62 days for trammel nets, n = 75 days for longlines). The results of the study indicated that more than 90% of the catch composition consisted of non-indigenous species in trammel net fishery and Pterois miles (Bennett, 1828), Siganus rivulatus Forsskål et Niebuhr, 1775, Siganus luridus (Rüppell, 1829), and Scarus ghobban Forsskål, 1775 were the most commonly caught species. Although indigenous species were more common in longlines compared with trammel nets, non-indigenous species Lagocephalus sceleratus (Gmelin, 1789) and Lagocephalus suezensis Clark et Gohar, 1953 were represented by relatively high catch ratios. The results also revealed that the CPUE of non-indigenous species exhibited seasonal differences. Although some non-indigenous species caught within this study have a market value, some other highly invasive species do not. Therefore, it is critically important to develop effective management tools to control bio-invasion. This study provides the first comprehensive research by utilizing basic data with relatively long-term surveys in the small-scale fishery on the Mediterranean coasts of Türkiye. The outcomes of this study can provide guidance to decision-makers. HTML XML PDF
  PubDate: Wed, 8 Mar 2023 21:23:30 +0200
Current status and length–weight relation of the European mudminnow,
Umbra krameri (Actinopterygii: Esociformes: Umbridae), from Jieț River,
Dolj County, southwestern Romania
- Abstract: Acta Ichthyologica et Piscatoria 53: 19-26
  DOI : 10.3897/aiep.53.99042
  Authors : Călin Lațiu, Mihnea Florian Moraru, Paul Uiuiu, Radu Constantinescu, Alexandru-Sabin Nicula, Tudor Papuc, Vioara Mireșan, Daniel Cocan : The habitat of the European mudminnow, Umbra krameri Walbaum, 1792, is continuously decreasing due to human intervention. The species has a “vulnerable” status according to the IUCN Red List. Thus, new information about the species is needed for conservation efforts. Minnow traps were used for capturing Umbra krameri and other small fishes in the Jieț River, Dolj County, southwestern Romania. Captured specimens of U. krameri were measured and weighed. Length–weight relations and relative condition factor were determined for the captured U. krameri specimens. A total of 94 fishes were captured using the minnow traps. They represented 7 species: European bitterling, Rhodeus amarus (Bloch, 1782), roach, Rutilus rutilus (Linnaeus, 1758), rudd, Scardinius erythrophthalmus (Linnaeus, 1758), Danubian spined loach, Cobitis elongatoides Băcescu et Mayer, 1969, weatherfish, Misgurnus fossilis (Linnaeus, 1758), tubenose goby, Proterorhinus marmoratus (Pallas, 1814), and U. krameri. The specimens of Umbra krameri represented 44% (41 specimens) of the total catch. The wet body weight (BW) of U. krameri ranged from 0.8 to 5.1 g, having a mean value of 2.102 g. The mean total length (TL) was 5.782 cm, ranging from 4.59 to 7.87 cm. According to the length–weight relation (LWR), the growth type of U. krameri was positive allometric based on the determined equation: BW = 0.0068TL3.277. The mean value determined for the relative condition factor (Kn) was 1.0056486. The growth condition of 46% of the specimens was poor (Kn < 1; n = 19), while the other 54% were in good condition (Kn ≥ 1; n = 22). The presently reported study provides information about the presence of U. krameri in the Jieț River (Dolj County, Romania), a location where the species has not been previously reported. The LWRs show an allometric positive growth. The relative condition factor shows that 46% of the specimens had poor growth, while the rest were in good condition. Minnow traps were an efficient tool for small fish capture. HTML XML PDF
  PubDate: Tue, 28 Feb 2023 09:59:36 +020
A treatise about reliability in dating events of evolutionary history
of brown trout Salmo cf. trutta (Actinopterygii) at Western Balkans:
Impassable barriers, isolation of populations and assistance of geological
timeframe
- Abstract: Acta Ichthyologica et Piscatoria 53(1): 1-18
  DOI : 10.3897/aiep.53.97702
  Authors : Ana Marić, Danica Srećković Batoćanin, Dubravka Škraba Jurlina, Miloš Brkušanin, Jelena Karanović, Tamara Kanjuh, Vera Nikolić, Danilo Mrdak, Predrag Simonović : A pool of data already existing about D-loop, i.e., the Control Region (CR) haplotypes of the mitochondrial DNA (mtDNA) of brown trout, Salmo trutta Linnaeus, 1758, tentative Adriatic trout Salmo farioides Karaman, 1938, and tentative Macedonian trout, Salmo macedonicus (Karaman, 1924), and their reconstructed phylogeography makes a good starting point for resolving their evolutionary history. That includes the dating of particular events in it. The events have hitherto been dated using the method of a molecular clock. Various calibrations were applied for the mutation rate, owing to the incongruence between the time of divergence that various authors notified and general knowledge about events in geological history and the periods in which they occurred in the Mediterranean region. Since geological history events were mandatory for setting the scene for the evolutionary history of brown trout, the incongruence between them has questioned the molecular clock calibration’s validity. From results about both the phylogeography and phylogenetic relations between native haplotypes (both partial and whole CR sequences) and the population genetics that characterized particular populations, we calculated the time of divergence between haplotypes in the regions of the western part of the Balkans: Iron Gate broader area in eastern Serbia, continental Montenegro and south-eastern Serbia. The distinct status of adjacent populations was verified by frequencies of microsatellites’ alleles and the STRUCTURE analysis that examined the significance of differences between them. In particular, we examined the populations that were clearly separated either by physical barriers, such as a waterfall in eastern Serbia (e.g., the upper and lower River Rečka supplemented by nearby rivers Vratna and Zamna), or by underground drops in Montenegro (e.g., upper and lower River Zeta, and rivers Nožica and lower River Mrtvica as isolated counterparts). We used the so far most common substitution rate of 1% in a million years’ (MY) period. The divergence times we obtained were compared to the events known for the region from available geological history data. There was a fairly good congruence between the dating obtained by the molecular clock method and that by geological history where the advanced, i.e., modern haplotypes, were concerned. In contrast, the congruence was worse for dating of divergence when more ancient haplotypes were in question, being much better if the mutational rate would be decreased to lower rates. That supported results both from the Rate Correlation Test about the independence of evolutionary rates in different lineages of brown trout, and from the Molecular Clock Test, which revealed that the evolutionary rate throughout the phylogenetic tree is not equal. That implies a difference in the speed of evolution in them, which was likely slower and faster, in the ancient, pre-Pleistocene haplotypes and the advanced, Pleistocene ones, respectively. The setting of the variable, or non-linear (i.e., logarithmic) speed of evolving seems helpful, since the early cladogenesis with the dominance of mutations was most likely combined afterwards with the acting of other evolutionary mechanisms, especially of genetic drift in populations that passed through the bottleneck episodes of the abrupt decrease in population size during the unfavourable periods of their evolutionary history. HTML XML PDF
  PubDate: Mon, 27 Feb 2023 18:13:50 +020