scholarly journals Habitat characteristics and environmental parameters influencing fish assemblages of karstic pools in southern Mexico

2013 ◽  
Vol 11 (4) ◽  
pp. 859-870 ◽  
Author(s):  
María Eugenia Vega-Cendejas ◽  
Mirella Hernandez de Santillana ◽  
Steven Norris
Keyword(s):  
Fish Assemblages ◽  
Anthropogenic Impacts ◽  
Conservation Status ◽  
Monitoring Program ◽  
Biosphere Reserve ◽  
Fish Diversity ◽  
Fish Assemblage Structure ◽  
Southern Mexico ◽  
Calakmul Biosphere Reserve ◽  
Poecilia Mexicana

Fish assemblage structure was evaluated and compared among 36 karstic pools located within protected areas of the Calakmul Biosphere Reserve (southern Mexico) and unprotected adjacent areas beyond the Reserve. Nonmetric multidimensional scaling (MDS), indicator species analysis (ISA), and canonical correspondence analysis (CCA) were used to identify which environmental factors reflected local influences and to evaluate the correlation of these variables with fish assemblages structure. Thirty-one species were encountered in these karstic pools, some for the first time within the Reserve. These aquatic environments were separated into three groups based on physico-chemical characteristics. Although CCA identified significant associations between several fish species (based on their relative abundance) and environmental variables (K, NH4, NO3, and conductivity), the most abundant species (Astyanax aeneus, Poecilia mexicana, and Gambusia sexradiata ) occur in most pools and under several environmental conditions. Baseline data on fish diversity along with a continued monitoring program are essential in order to evaluate the conservation status of fish assemblages and their habitats, as well as to measure the influence of anthropogenic impacts on pristine habitats such as the karstic pools of the Calakmul Biosphere Reserve.

scholarly journals Changes in the structure of fish assemblages in streams along an undisturbed-impacted gradient, upper Paraná River basin, Central Brazil

2010 ◽  
Vol 8 (3) ◽  
pp. 587-598 ◽  
Author(s):  
Alesandra Martins Dias ◽  
Francisco Leonardo Tejerina-Garro
Keyword(s):  
Fish Assemblages ◽  
Anthropogenic Impacts ◽  
Similarity Index ◽  
Fish Assemblage Structure ◽  
Conservation Unit ◽  
Dry Period ◽  
Conservation Areas ◽  
Cerrado Vegetation ◽  
Central Brazil ◽  
Agricultural Areas

The João Leite River is located in the upper Paraná basin, Central Brazil. It drains areas covered by Cerrado vegetation interspersed with urban and agricultural areas. This study aims to asses changes of the fish assembleges structure along a undisturbed-impacted gradient in ten stream stretches using ecological descriptors, a similarity index and the abundance-biomass relationship (ABC curves). The fish were collected during the dry period using electrofishing gear in stretches of 50 m. Results show that the environmental variation observed along the undisturbed-impacted gradient considered influences on fish assemblage structure. Both richness and diversity differences between fish assemblages are partially influenced by stream stretch orthonian order and anthropogenic impacts. ABC curves classified six stream stretches located in preserved or impacted areas as undisturbed while four stretches were classified as disturbed. This is attributed to the influence of the undisturbed habitat within the conservation unit and the presence of K- or r- strategist species. This type of study contributes to an understanding of the effects of aquatic environment conservation on the Brazilian Cerrado core area, where the choice of conservation areas prioritizes terrestrial over aquatic aspects.

scholarly journals Single-Species Co-management Improves Fish Assemblage Structure and Composition in a Tropical River

2021 ◽  
Vol 9 ◽  
Author(s):  
Wendell M. Medeiros-Leal ◽  
Leandro Castello ◽  
Carlos E. C. Freitas ◽  
Flávia K. Siqueira-Souza
Keyword(s):  
Fish Assemblage ◽  
Amazon Basin ◽  
Fish Assemblages ◽  
Single Species ◽  
Floodplain Lakes ◽  
Fish Diversity ◽  
Fish Assemblage Structure ◽  
Target Species ◽  
Limited Access ◽  
Positive Effects

Co-management is increasingly recognized as an effective model for managing fisheries, but little information exists on whether co-management can produce effects in species other than the target species. Fishery co-management in the tropics, where fish diversity is high and fish catches tend to be multispecies, is prone to produce assemblage-wide effects via alterations in the food web and changes in the overall capture of non-target species. Here, we assessed the effects of co-management for the species Arapaima sp. in relation to the structure and composition of the overall fish assemblage in floodplain lakes of the central Amazon Basin. These floodplain lakes are managed under a system of zoning of fishing activities. We used data from surveys of six floodplain lakes, including two lakes of each of three categories (lakes where fishing is prohibited, limited-access lakes, and open fishing lakes). The surveys were carried out before and after implementation of co-management, through gillnet fishing. The study area was the lower Solimões River, in the Amazon Basin, Brazil. Statistical models showed significant changes in the composition and structure of the fish assemblages after the implementation of the co-management, regardless of the zoning category. Through regulation of gear use and fishing practices, co-management allowed the colonization of species that had not been present before, which lead to higher richness and consequently increased fish sizes, abundance and biomass. Species of sedentary habits, migrants of short and medium distances, with commercial importance benefited the most from co-management. In the results presented in temporal scale, it was possible to observe a potential spillover effect being provided by the lakes where fishing is prohibited (no-take zones) and those of limited access that benefited those open to fishing. Thus, co-management had positive effects in the structure and composition of fish assemblages in all lakes, regardless of zoning category.

scholarly journals Fish Assemblages in Abandoned Ponds and Waterways Surrounding Brackish Water Aquaculture Ponds in Panay Island, the Philippines

2007 ◽  
Vol 19 (3) ◽  
Author(s):  
K. IKEJIMA ◽  
J.D. RONQUILLO ◽  
V.L. CORRE, JR ◽  
V.A. DUREZA
Keyword(s):  
Brackish Water ◽  
Fish Assemblages ◽  
Species Group ◽  
The Philippines ◽  
Fish Diversity ◽  
Fish Assemblage Structure ◽  
Diverse Species ◽  
Mangrove Vegetation ◽  
Aquaculture Ponds ◽  
Brackish Water Aquaculture

Fish assemblage structure in abandoned ponds and waterways in Panay Island, Philippine, were investigated and compared with those in mangrove fringed habitats. Juvenile and small resident fishes were collected using a seine net set along the beach, creeks, waterways and abandoned culture ponds. Sampling stations were characterized by the absence or presence of mangrove vegetation. Fish diversity was higher on beaches and in creeks with mangroves and in creeks without mangrove compared with abandoned ponds and waterways. Gobiidae was the most diverse species group, being abundant in most stations. More species of juveniles occurred in mangrove habitats and river banks than in abandoned ponds and waterways. However, fish abundance and biomass were not clearly different between stations. The results suggest that fish diversity decreases in areas with culture pond constructions, but these still provide habitat for gobies and juveniles of a few other species.

scholarly journals Space-time dynamics in monitoring neotropical fish communities using eDNA metabarcoding

2020 ◽  
Author(s):  
Naiara Guimarães Sales ◽  
Owen Simon Wangensteen ◽  
Daniel Cardoso Carvalho ◽  
Kristy Deiner ◽  
Kim Præbel ◽  
...  
Keyword(s):  
Fish Assemblages ◽  
Anthropogenic Impacts ◽  
Fish Communities ◽  
River Mouth ◽  
Fish Diversity ◽  
12S Rrna ◽  
Rain Event ◽  
Time Dynamics ◽  
Α Diversity ◽  
Spatio Temporal

ABSTRACTThe biodiverse Neotropical ecoregion remains insufficiently assessed, poorly managed, and threatened by unregulated human activities. Novel, rapid and cost-effective DNA-based approaches are valuable to improve understanding of the biological communities and for biomonitoring in remote areas. Here, we evaluate the potential of environmental DNA (eDNA) metabarcoding for assessing the structure and distribution of fish communities by analysing sediments and water from 11 locations along the Jequitinhonha River catchment (Brazil). Each site was sampled twice, before and after a major rain event in a five-week period and fish diversity was estimated using high-through-put sequencing of 12S rRNA amplicons. In total, 252 Molecular Operational Taxonomic Units (MOTUs) and 34 fish species were recovered, including endemic, introduced, and previously unrecorded species for this basin. Spatio-temporal variation of fish assemblages was detected, richness during the first campaign was nearly twice as high as in the second sampling round; though peaks of diversity were primarily associated with only four locations. No correlation between β-diversity and longitudinal distance or presence of dams was detected, but low species richness observed at sites located near dams indicates that these anthropogenic barriers might have an impact on local fish diversity. Unexpectedly high α-diversity levels recorded at the river mouth suggest that these sections should be further evaluated as putative “eDNA reservoirs” for rapid monitoring. By uncovering spatio-temporal changes, unrecorded biodiversity components, and putative anthropogenic impacts on fish assemblages, we further strengthen the potential of eDNA metabarcoding as a biomonitoring tool, especially in regions often neglected or difficult to access.

scholarly journals Indigenous Freshwater Ichthyofauna in the Dhanu River and Surrounding Wetlands of Bangladesh: Species Diversity, Availability, and Conservation Perspectives

Conservation ◽  
2021 ◽  
Vol 1 (3) ◽  
pp. 241-257
Author(s):  
Debasish Pandit ◽  
Shuva Saha ◽  
Mrityunjoy Kunda ◽  
Ahmed Harun-Al-Rashid
Keyword(s):  
Fish Species ◽  
Anthropogenic Impacts ◽  
Public Awareness ◽  
Conservation Status ◽  
Habitat Preferences ◽  
National Level ◽  
Fish Population ◽  
Population Trends ◽  
Fish Diversity ◽  
Wallago Attu

A checklist of the native fishes of the Dhanu River and adjacent waters at Mithamain Upazila under the Kishoreganj district of Bangladesh is prepared with details on their availability, conservation status, habitat preferences, population trends, and threats. Data were collected monthly by field survey, focus group discussions, and personal interviews by using a semi-structured questionnaire and a pictorial check list of fish species. A total of 91 indigenous fish species of 59 genera belonging to 29 families under 11 orders were documented where 17.6%, 27.5%, 31.9%, and 23.1% species were abundantly available, commonly available, moderately available, and rarely available, respectively. Among those, 24 fish species (26.4%) were under the threatened category (3 critically endangered, 11 endangered, and 10 vulnerable) according to the IUCN Bangladesh. Notably, the globally threatened Cirrhinus cirrhosus, Channa orientalis, and Wallago attu were available in the study area. Fish population trends of 24.2% and 59.3% of the entire fish species were found in decreasing trends at the global and national level, respectively. The leading threats to the fish diversity were indiscriminate overfishing followed by fishing by dewatering of wetlands, the katha fishing method, the use of deprecated fishing gears, etc. Minimizing anthropogenic impacts, enacting fishing laws, installing and managing fish sanctuaries, and raising public awareness can be effective for the conservation of existing fisheries resources.

scholarly journals Long-term study of reservoir cascade in south-eastern Brazil reveals spatio-temporal gradient in fish assemblages

2018 ◽  
Vol 69 (12) ◽  
pp. 1983 ◽  
Author(s):  
Raquel Coelho Loures ◽  
Paulo Santos Pompeu
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Fish Assemblage ◽  
Native Species ◽  
Fish Assemblages ◽  
Native Fish ◽  
Fish Diversity ◽  
Fish Assemblage Structure ◽  
Long Term Study

In reservoir cascades, effects on fish assemblages are expected to strengthen over time and transfer from one reservoir to an adjacent one. To test this, fish-assemblage data from 23 years of monitoring in the Araguari reservoir cascade system, upper Paraná River basin, were analysed. The results showed a clear reduction in richness of native and migratory fish species and an increase of non-native species, following reservoir formation. Migratory species richness was higher in reservoirs that presented habitats similar to lotic stretches or tributaries upstream of the impounded area. There was a clear tendency for native species to decline and non-native fish species to increase, in a downstream direction. Fish assemblages became increasingly dissimilar as reservoirs became more distant from each other (longitudinal gradient) and were dominated by small and medium-sized species. Alongside longitudinal position, reservoir area, age and the presence of herbivorous non-native fish were found to be important predictors of variation in fish-assemblage structure. Results from the present study help clarify the potential accumulated impacts of reservoir cascades on fish diversity, which must be carefully considered in river-basin inventories for hydropower plants, and reinforce the importance of long-term monitoring, considering longitudinal and lateral dimensions of the basin.

scholarly journals Assemblage structure and spatial diversity patterns of kelp forest-associated fishes in Southern Patagonia

PLoS ONE ◽  
2021 ◽  
Vol 16 (9) ◽  
pp. e0257662
Author(s):  
Mathias Hüne ◽  
Alan M. Friedlander ◽  
Enric Ballesteros ◽  
Jennifer E. Caselle ◽  
Enric Sala
Keyword(s):  
Fish Assemblage ◽  
Fish Assemblages ◽  
Anthropogenic Impacts ◽  
Fish Fauna ◽  
Spatial Diversity ◽  
Assemblage Structure ◽  
Kelp Forests ◽  
Fish Assemblage Structure ◽  
Important Species ◽  
Southern Patagonia

Knowledge of the ecology of the fish fauna associated with kelp (primarily Macrocystis pyrifera) forests in Southern Patagonia is scarce, especially in how abiotic and biotic variables influence their structure, diversity, and distribution. This information is important for the management and conservation of this unique ecosystem, which has minimal anthropogenic impacts at present. We analyzed data from 122 quantitative underwater transects conducted within kelp forests at 61 stations from Chile’s southern Patagonian fjords to the Cape Horn and Diego Ramirez archipelagos and the southern tip of Argentina, including the Mitre Peninsula and Isla de los Estados. In total, 25 fish species belonging to 13 families were observed. Multivariate analysis indicated that there are significant differences in fish assemblage structure among locations and wave exposures, which was driven primarily by Patagonotothen sima and Paranotothenia magellanica, which occurred on exposed and semi-exposed stations. P. cornucola was mainly distributed across sheltered stations of the Kawésqar National Park. Temperature, salinity, depth, and kelp density influenced fish assemblage structure, with the highest diversity in areas with the lowest temperature and greater depth at Isla de los Estados. In contrast, species richness, diversity, abundance, and biomass were all lower in areas with high density of the understory kelp Lessonia spp., which might be driven by the absence of P. tessellata, P. squamiceps and P. cornucola, the most important species in terms of occurrence, abundance, and biomass. Our study provides the first broad-scale description of the fish assemblages associated with kelp forests along the southern cone of South America based on non-invasive visual transects, improving our knowledge of the distribution of fish assemblages across several environmental conditions in this vast and little-studied area.

scholarly journals Reef Structural Complexity Influences Fish Community Metrics on a Remote Oceanic Island: Serranilla Island, Seaflower Biosphere Reserve, Colombia

Oceans ◽  
2021 ◽  
Vol 2 (3) ◽  
pp. 611-623
Author(s):  
Diana Castaño ◽  
Diana Morales-de-Anda ◽  
Julián Prato ◽  
Amílcar Leví Cupul-Magaña ◽  
Johanna Paola Echeverry ◽  
...  
Keyword(s):  
Reef Fish ◽  
Fish Assemblages ◽  
Coral Cover ◽  
Structural Complexity ◽  
Biosphere Reserve ◽  
Fish Diversity ◽  
Illegal Fishing ◽  
Fish Community Metrics ◽  
San Andres ◽  
Evident Relationship

Serranilla is a protected island of the Seaflower Biosphere Reserve, far from dense human population. These characteristics could help sustain structurally complex coral reefs, often associated with higher biodiversity, abundance, and biomass of reef-associated organisms, including reef fish. However, the multiple threats present in Serranilla, including intense illegal fishing, can impact coral ecosystems generally and also specific key groups, such as the parrotfish, in particular. During the “Seaflower Research Expedition 2017”, we assessed how structural habitat complexity influences reef fish assemblages. In addition, we explored differences in parrotfish species (family: Scaridae) between Serranilla and San Andrés, the most populated island in the Archipelago. On Serranilla, we found that habitat structure, rugosity, and coral cover accounted for up to 66% of variation in reef fish diversity, abundance, and biomass, with values being higher on more complex reefs. Parrotfish species differed between the islands, with larger species supporting higher biomasses at Serranilla, by comparison with San Andrés; however, the abundance, biomass, and lengths of parrotfish species were low in both areas compared with those reported from other protected Caribbean reefs. Our study indicates that despite the evident relationship between structurally complex habitats and reef fish, other threats in Serranilla could be affecting parrotfish populations, such as illegal fishing, a widespread activity in the area.

scholarly journals Deep-Water Cartilaginous Fishes in the Central Mediterranean Sea: Comparison between Geographic Areas with Two Low Impact Tools for Sampling

2021 ◽  
Vol 9 (7) ◽  
pp. 686
Author(s):  
Angela Carluccio ◽  
Francesca Capezzuto ◽  
Porzia Maiorano ◽  
Letizia Sion ◽  
Gianfranco D’Onghia
Keyword(s):  
Adriatic Sea ◽  
Fish Habitat ◽  
Conservation Status ◽  
Abundant Species ◽  
Cartilaginous Fish ◽  
Fish Diversity ◽  
Ionian Sea ◽  
Central Mediterranean ◽  
The North ◽  
North Western

Baited lander represents a low impact technique, an alternative to the traditional trawl sampling for collecting data on fish diversity and abundance, especially for threatened species such as Chondrichthyes living in sensitive habitats. In this study, distribution and abundance of cartilaginous fish were compared between two geographic areas, the southern Adriatic Sea and the north-western Ionian Sea, with two low impact sampling gears, an experimental bottom longline and a baited lander. Species diversity was evaluated by applying ecological indices and difference in mean abundances were tested using multivariate analysis. A total of 13 species of cartilaginous fish were collected. Significant differences in the assemblage recorded in the same area using different sampling tools were detected and no significant differences were detected among different areas explored with the same method. Using longline, the most abundant species collected in both areas was Galeus melastomus, while using lander, the most observed species were Dalatias licha in the southern Adriatic Sea and Hexanchus griseus in the north-western Ionian Sea. According to IUCN classification, of the 13 species collected, 2 are near threatened and 5 are threatened. A better governance of sensitive habitats coinciding with the essential fish habitat for these species would ensure them a better conservation status.

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