Effects of Hydrology on Fish Diversity and Assemblage Structure in a Texan Coastal Plains River

<i>Abstract.</i>—The Brazilian savanna (Cerrado) is a biome of global importance with great endemism and environmental heterogeneity, but it is highly threatened and overexploited. Such a set of conditions is a key aspect of freshwater biodiversity and a challenge to our understanding of species-rich regions. Therefore, we investigated the fish diversity patterns and the effects of different land uses on fish assemblage structure in 155 Cerrado stream sites in four hydrological units. We assessed catchment land use and cover upstream of each sample site, where fish were sampled once during the dry season. Stream fish diversity patterns and the effects of different land uses on assemblage structure differed among the four hydrologic units, and in the region as a whole, but high values of beta diversity due to species turnover were consistently observed. We observed low explanation of land use in relation to fish assemblage structure, probably because of the high level of species turnover and large number of rare species. For some units, the most-correlated land uses were anthropogenic, and alien species were positively related to anthropogenic impacts. Our analysis highlights the importance of the heterogeneous composition of the fish fauna in Brazilian savanna streams and the significance of shifting towards protecting or properly managing whole basins and drainage networks.

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Fish Diversity and Fish Assemblage Structure in Seagrass Meadows at Sikao Bay, Trang Province, Thailand

Open Journal of Ecology ◽

10.4236/oje.2015.512047 ◽

2015 ◽

Vol 05 (12) ◽

pp. 563-573 ◽

Cited By ~ 1

Author(s):

Wikit Phinrub ◽

Bunyat Montien-Art ◽

Jongkol Promya ◽

Apinun Suvarnaraksha

Keyword(s):

Fish Assemblage ◽

Assemblage Structure ◽

Fish Diversity ◽

Fish Assemblage Structure ◽

Seagrass Meadows

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Fish Diversity and Conservation Perspectives of Gandak River, India

Our Nature ◽

10.3126/on.v11i1.8246 ◽

2013 ◽

Vol 11 (1) ◽

pp. 76-84 ◽

Cited By ~ 1

Author(s):

P. K. Srivastava

Keyword(s):

Distribution Pattern ◽

Fish Species ◽

Lower Risk ◽

Uttar Pradesh ◽

Assemblage Structure ◽

Fish Diversity ◽

Threat Status ◽

Commercially Important ◽

Gandak River ◽

Near Threatened

Study of 10 km stretch of Gandak River in Uttar Pradesh revealed the ichthyofaunal diversity, assemblage structure, distribution pattern, threat status, ornamental and commercially important fishes. In all 54 fish species were recorded of many commercially important fishes. Among these species 45% belong to lower risk near threatened (LRnt), 26% vulnerable (VU), 11% lower risk least concern (LRlc), 11% not evaluated (NE) and 7% endangered (EN) category. Cyprinidae 33% were most important followed by Bagridae (11%), Channidae (9%), Tetradontidae (5%). DOI: http://dx.doi.org/10.3126/on.v11i1.8246 Our Nature Vol.11(1) 2013: 76-84

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Pattern of fish diversity and assemblage structure in the middle and lower reaches of the Yiluo River, Yellow River

Journal of Lake Sciences ◽

10.18307/2019.0217 ◽

2019 ◽

Vol 31 (2) ◽

pp. 482-492

Author(s):

LIN Pengcheng ◽

◽

LI Shuzhen ◽

QIN Xiangchao ◽

CHENG Weixi ◽

...

Keyword(s):

Yellow River ◽

Assemblage Structure ◽

Fish Diversity

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Longitudinal Patterns of Population Structure for Fishes Inhabiting River Tawi in Jammu region (J&K)

Biosciences Biotechnology Research Asia ◽

10.13005/bbra/2550 ◽

2017 ◽

Vol 14 (3) ◽

pp. 1121-1127

Author(s):

Roopma Gandotra ◽

Rizwan uz zaman ◽

Vivek Vivek

Keyword(s):

Population Structure ◽

Fish Species ◽

Diversity Indices ◽

Assemblage Structure ◽

Fish Diversity ◽

Longitudinal Patterns ◽

Downstream Section

ABSTRACT: The present study, was carried out to investigate the diversity and assemblage structure of ichthyofauna of bothupstream and downstream section of river Tawi from four different sections i.e. Station I (Chenani), Station II (Jhajjar kotli),Station III (Nagrota), and Station IV (Gujjar Nagar).The sampling was done from January 2016 to December 2016. The results of present investigation revealed the occurrence of twenty one fish species in all the study stations belonging to five orders viz. Cypriniformes, Mastacembeliformes, Synbranchiformes, Perciformes & Siluriformes and 6 families i.e. Cyprinidae, Nemachilidae, Mastacembelidae, Chinnidae, Sisuridae and Bagaridae. In all the study stations Cyprinidae was found to be dominant(62%)followed by family Nemacheilidae,(9%) Mastacembelidae, (9%) Channidae, (10%) Sisuridae and Bagaridae showed least contribution of 5% each. The fish diversity indices i.e. Shannon weiner (H) and Evenness (e) at all the stations were 1.286 & 0.7234, 1.662 & 0.753, 1.959 & 0.5454 and 1.978 &0.4252 at station I, II, III and IV respectively.

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Seasonal and longitudinal variation in fish assemblage structure along an unregulated stretch of the Middle Uruguay River

Neotropical Ichthyology ◽

10.1590/1982-0224-20190043 ◽

2019 ◽

Vol 17 (4) ◽

Author(s):

Marthoni Vinicius Massaro ◽

Lucas Adriano Pachla ◽

Rodrigo Bastian ◽

Fernando Mayer Pelicice ◽

David Augusto Reynalte-Tataje

Keyword(s):

Riparian Vegetation ◽

Assemblage Structure ◽

Seasonal Effects ◽

Fish Diversity ◽

Fish Assemblage Structure ◽

Flow Depth ◽

River Section ◽

Natural Conditions ◽

Diversity Patterns ◽

Uruguay River

ABSTRACT Diversity patterns and their causes remain important questions, especially for ecosystems that preserve natural conditions. This is the case of fish diversity in large Neotropical rivers. In this context, we investigated fish diversity patterns along an extensive unregulated river section (ca. 450 km) in the Middle Uruguay River Basin. Sampling was conducted seasonally between May 2017 and March 2018, at six sites (patches) with contrasting environmental conditions. We collected 3,008 individuals belonging to 90 species. Nine were migratory, which summed relevant biomass in local assemblages (20 to 60%). We observed spatial variation in assemblage structure, but weak seasonal effects. Overall, biomass was similar among sites, but richness tended to increase downstream. Migratory fishes showed opposed trends, with higher richness and biomass upstream, particularly catfishes (Siluriformes). Ordination analyses separated sites in three groups based on variations in composition and abundance, and revealed associations between these groups and specific hydro-geomorphic conditions (i.e., flow, depth, channel width and the presence of riparian vegetation). Our study revealed that fish diversity distributes heterogeneously along the main channel, where hydro-geomorphic patches select for distinct assemblages along riverine gradients.

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