scholarly journals Patterns of Pelagic Fish Diversity in Floodplain Lakes of Whitewater and Blackwater Drainage Systems Within the Central Amazon River Basin of Brazil

2021 ◽  
Vol 9 ◽  
Author(s):  
Flávia K. Siqueira-Souza ◽  
Lawrence E. Hurd ◽  
Kedma C. Yamamoto ◽  
Maria Gercilia M. Soares ◽  
Gregory J. Cooper ◽  
...  
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
River Basin ◽  
Amazon Basin ◽  
Pelagic Fish ◽  
Floodplain Lakes ◽  
Fish Diversity ◽  
River Systems ◽  
Amazon River Basin ◽  
Central Amazon

The Amazon River Basin, one of the world’s most threatened ecosystems, has an enormous diversity of fish species, a result of temporally and spatially complex habitat containing biogeochemically different river systems. The annual hydrologic cycle results in floodplain lakes during low water and inundates forests during high water, exposing fish to different resources and environmental conditions. The two principal river systems in the central Brazilian Amazon are blackwater, with nutrient-poor acidic water, and nutrient-rich whitewater. Although species-rich, the Amazon Basin is data-poor in terms of comparative studies on a regional scale. We analyzed data sets from independent sampling studies of pelagic fish in 16 floodplain lakes, nine whitewater (Rio Solimões) and seven blackwater (Rio Negro), in the central Amazon Basin of Brazil. Our findings suggest striking similarities in pelagic fish diversity patterns. Species richness was virtually equal (165 in whitewater and 168 in blackwater). Both species richness, and number of migratory species, per lake increased toward the confluence of the rivers in both systems in our study. The proportion of unique species was also similar in whitewater lakes and blackwater (41 and 43%, respectively), boosting total regional richness to 237 species. However, species composition in whitewater lakes was more homogenous (lower β diversity), and species composition was associated with conductivity and pH in whitewater, but with dissolved oxygen and transparency in blackwater. Therefore, regional fish diversity cannot be represented by sampling one lake or even one drainage system, but must include multiple lakes from both systems. These two systems may differ in sensitivity to anthropogenic stressors such as damming and deforestation.

scholarly journals Fish diversity of floodplain lakes on the lower stretch of the Solimões River

2004 ◽  
Vol 64 (3a) ◽  
pp. 501-510 ◽  
Author(s):  
F. K. Siqueira-Souza ◽  
C. E. C. Freitas
Keyword(s):  
Species Richness ◽  
Fish Community ◽  
River Flow ◽  
Abundant Species ◽  
Floodplain Lakes ◽  
Fish Diversity ◽  
The Town ◽  
Solimões River

The fish community of the Solimões floodplain lakes was studied by bimonthly samples taken from May 2001 to April 2002. These were carried out at lakes Maracá (03º51'33"S, 62º35'08,6"W), Samaúma (03º50'42,1"S, 61º39'49,3"W), and Sumaúma and Sacambú (03º17'11,6"S and 60º04'31,4"W), located between the town of Coari and the confluence of the Solimões and Negro rivers. Collections were done with 15 gillnets of standardized dimensions with several mesh sizes. We collected 1,313 animals distributed in 77 species, belonging to 55 genera of 20 families and 5 orders. Characiformes was the most abundant Order, with a larger number of representatives in the Serrasalmidae and Curimatidae. The most abundant species in the samplings were Psectrogaster rutiloides (132 individuals), Pigocentrus nattereri (115 individuals), and Serrasalmus elongatus (109 individuals). Lakes Samaúma, Sacambú, and Sumaúma were adjusted to logarithmic and lognormal series. The diversity exhibited an inverse gradient to the river flow, showing the highest diversity at Lake Sumaúma, followed by Samaúma, Sacambú, and Maracá. Species richness estimated through the jackknife technique ranged from 78 to 107 species.

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 Ichthyofauna from “serranias costeiras” of the Ribeira de Iguape River basin, Southeast Brazil

2020 ◽  
Vol 20 (4) ◽  
Author(s):  
Mauricio Cetra ◽  
George Mattox ◽  
Perla Bahena Romero ◽  
Stephanie Hernández Escobar ◽  
Euriluce Aparecida Guimarães ◽  
...  
Keyword(s):  
Species Richness ◽  
River Basin ◽  
Endemic Species ◽  
Fish Community ◽  
Environmental Heterogeneity ◽  
Alpha Diversity ◽  
Fish Diversity ◽  
Sampling Effort ◽  
Gamma Diversity ◽  
Data Set

Abstract: The Ribeira de Iguape River basin has about 100 fish species. This study aimed to characterize the fish community from “serranias costeiras” of the Ribeira de Iguape River basin. Samplings were conducted with electrofishing during the dry season in the years 2018-2019. The sampling effort consisted of 30 streams stretches. As a result, 50 species were captured, distributed in 37 genera, 11 families, and six orders. The species richness estimate (SChao1) was 57 species, and the coverage estimate for the entire data set was C = 0.998. Harttia kronei and Chasmocranus lopezae are endemic species and can be used as bioindicators of streams in this river basin. We captured approximately nine species by stream stretch. Beta diversity was found to be more critical for gamma diversity than alpha diversity. This finding highlights the streams environmental heterogeneity importance for maintaining regional fish diversity. We captured eight individuals of the threatened species Spintherobolus papilliferus and this indicates an expansion in the geographic distribution of this species.

scholarly journals FISH DIVERSITY AND DISTRIBUTION IN THE AKSU RIVER ESTUARY (ANTALYA-TURKEY), IN RELATION TO ENVIRONMENTAL VARIABLES

2016 ◽  
Vol 5 ◽  
pp. 90-98
Author(s):  
Deniz İnnal
Keyword(s):  
Species Richness ◽  
Species Composition ◽  
Fish Assemblage ◽  
Seasonal Changes ◽  
Environmental Variables ◽  
Dominant Species ◽  
Seasonal Pattern ◽  
River Estuary ◽  
Fish Diversity ◽  
Liza Aurata

Seasonal changes in abundance, species composition, and life-style categories of the fish assemblage in a shallow Mediterranean estuary of southwestern Turkey are described. Fishes were sampled monthly by different nets in Aksu River Estuary from October 2006 and March 2008. In total, 3347 individuals from 26 species were captured. Mugil cephalus, Vimba vimba and Liza aurata were the dominant species and comprised over 50% of the total number. The fish comprised 10 marine, 14 freshwater and 2 migrant. The index of species richness, Shannon-wiener diversity, and evenness each showed a consistent seasonal pattern. Canonical correspondance analysis indicated that salinity correlated with the seasonal pattern in the fish assemblage.

Fish assemblages in floodplain lakes in a Neotropical river during the wet season (Magdalena River, Colombia)

2012 ◽  
Vol 28 (3) ◽  
pp. 271-279 ◽  
Author(s):  
Carlos Granado-Lorencio ◽  
Alejandra Gulfo ◽  
Frank Alvarez ◽  
Luz Fernanda Jiménez-Segura ◽  
Juan David Carvajal-Quintero ◽  
...  
Keyword(s):  
Species Richness ◽  
Fish Assemblages ◽  
Abiotic Factors ◽  
Environmental Parameters ◽  
Floodplain Lakes ◽  
Fish Diversity ◽  
Wet Season ◽  
River Floodplain ◽  
Lake Morphology ◽  
Magdalena River

Abstract:A number of studies have pointed out that abiotic factors and recolonization dynamics appear to be more important than biotic interactions in structuring river–fish assemblages. In this paper, we studied the fish assemblages in 27 floodplain lakes, with perennial connection to the river, in the middle section of the Magdalena River (Colombia), to examine spatial pattern in freshwater fish diversity in relation to some environmental parameters. Our objective was to examine relationships between floodplain-lake fish communities and environmental variables associated with lake morphology, water chemistry and river–floodplain connectivity in a large river–floodplain ecosystem. During the study, a total of 18 237 fish were caught from 50 species (regional richness; 17 were migrants and 33 residents). In the present study, the most diverse order was Characiformes with 20 species, followed by Siluriformes, with 19 species. Characidae and Loricaridae were the richest families. The range of species richness (local richness) varied between five and 39 species. Similarity of local assemblages (using the presence–absence data) depends on the distance between lakes. A positive relationship was observed between the Ln of the total abundance of each species and the number of lakes where they were found. Out of all the environmental parameters taken in the lakes, only the size (Log Area) and relative perimeter length are significantly related to local assemblage species richness. It has not been possible to demonstrate that the connectivity (distance) from lakes to the main river can be considered a predictor of the local richness.

Fish diversity and species composition in small-scale artificial reefs in Amazonian floodplain lakes: Refugia for rare species?

2014 ◽  
Vol 67 ◽  
pp. 165-170 ◽  
Author(s):  
Kedma Cristine Yamamoto ◽  
Carlos Edwar de Carvalho Freitas ◽  
Jansen Zuanon ◽  
Lawrence Edward Hurd
Keyword(s):  
Species Composition ◽  
Rare Species ◽  
Floodplain Lakes ◽  
Artificial Reefs ◽  
Small Scale ◽  
Fish Diversity

scholarly journals A systematic revision of Tatia (Siluriformes: Auchenipteridae: Centromochlinae)

2008 ◽  
Vol 6 (3) ◽  
pp. 495-542 ◽  
Author(s):  
Luisa Maria Sarmento-Soares ◽  
Ronaldo Fernando Martins-Pinheiro
Keyword(s):  
New Species ◽  
River Basin ◽  
Amazon Basin ◽  
French Guiana ◽  
Color Pattern ◽  
Genital Papilla ◽  
River Drainage ◽  
Central Amazon ◽  
Negro River ◽  
A New Species

The auchenipterid catfish genus Tatia is revised. Twelve species are recognized including three described as new. Tatia is diagnosed by the hyomandibula elongated anterodorsally, the anal-fin base of adult males reduced in length, and the caudal peduncle laterally compressed and deep with a middorsal keel. Tatia aulopygia occurs in the Madeira river drainage and is distinguished by the reduced cranial fontanel in adults and male modified anal fin with middle rays reduced in length. Tatia boemia, known from the upper Uruguay river drainage, is distinguished by its unique color pattern with dark chromatophores on the sides of body. Tatia brunnea from river basins in Suriname and French Guiana and the Negro river drainage, Amazon basin, is recognized by its wide head and mouth and by the male modified anal fin with sharply pointed tip. Tatia dunni, from the upper Amazon basin, is recognized by its narrow head, long postcleithral process in some specimens, and body coloration with irregular blotches or stripes. Tatia galaxias, endemic to the Orinoco river basin, is distinguished by its large eye and short snout. Tatia gyrina, distributed in the upper and central Amazon basin and in northern Suriname, has a uniquely reduced mesethmoid, slightly protruding lower jaw, second nuchal plate with slightly concave lateral borders, third nuchal plate reduced, small prevomer, low number of ribs, low number of vertebrae and sexual dimorphism regarding intumescent male genital papilla. Tatia intermedia, recorded from central and lower Amazon basin, Tocantins river, and coastal drainages in Guyana, Suriname, French Guiana, and eastern Pará State, Brazil, is distinguished by the short postcleithral process, small eye and long snout. Tatia neivai, from the upper Paraná river , Paraguay river and upper Paraíba do Sul river basin, is distinguished by its unique vertebral count and caudal-fin coloration consisting of transverse dark bars. Tatia strigata, from central Amazon basin and Negro river, is distinguished by its horizontally striped color pattern and the modified male anal fin with middle rays reduced in length. Tatia caxiuanensis, a new species described from the Curuá river, lower Amazon basin, is recognized by its wide cranial fontanel and distinctive anal fin in mature males. Tatia meesi, a new species described from the Essequibo river basin, Guyana, is distinguished from congeners by the cranial fontanel with two separate openings and thin nasal bone. Tatia nigra, a new species described from the central Amazon basin, is distinguished by its short postcleithral process, low number of vertebrae, and dark color pattern. All twelve species of Tatia are described or redescribed and a key to species is provided.

scholarly journals Inter-annual variability of rainfalls in the Amazon basin and its vicinity

MAUSAM ◽  
2021 ◽  
Vol 58 (3) ◽  
pp. 351-360
Author(s):  
R. P. KANE
Keyword(s):  
River Basin ◽  
North Atlantic ◽  
North Atlantic Oscillation Index ◽  
Amazon Basin ◽  
Eastern Coast ◽  
Amazon River ◽  
Gridded Data ◽  
Amazon River Basin ◽  
Moderate Relationship ◽  
Enso Indices

An analysis of the rainfall series (12-month running means) of the 5° × 5° gridded data in the Amazon river basin and its vicinity (15° N – 20° S, 30° - 80° W) indicated that the rainfalls were highly variable both from year to year and from region to region. Correlations with even nearby regions hardly exceeded 0.50, though correlations were better (up to 0.70) in the regions near the eastern coast of Brazil. Moderate relationship with ENSO indices was obtained for the Amazon river basin and the regions to its north, and for NE Brazil, while moderate relationship with South Atlantic SST was obtained for NE Brazil and the region immediately to its west. All other relationships (with 30 hPa wind, North Atlantic Oscillation Index, etc.) were obscure.

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