Fish Assemblage Structure and Environmental Correlates in Nepal's Gandaki River

Edds, David R.

doi:10.2307/1446294

Cited by 86 publications

(92 citation statements)

References 17 publications

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“…Altitude was positively correlated with the first CCA axis and explained significant directions of variance in species distributions. This result is similar to the one obtained by Edds (1993) who also noticed that altitude was the most important factor contributing to variation in fish assemblage in the Gandaki River. In the Chishui River, Schizothoracinae and Nemachilinae species which mainly appeared in the upper reaches at an altitude of 1000−1500 m are adapted to harsh environment of cold water and energy availability.…”

Section: > Fish-habitat Relationshipssupporting

confidence: 91%

Fish assemblage structure in the Chishui River, a protected tributary of the Yangtze River

Wang

et al. 2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words:Chishui River, fish distribution, environmental variables, canonical correspondence analysis (CCA) , fish conservationThis study aimed to characterize fish assemblage and evaluate environmental influence on fish distribution in the Chishui River, a protected tributary of the upper Yangtze River. Thirty-one sites regularly distributed in longitudinal profiles were sampled in April, 2007. Sixty-two fish species belonging to 3 orders, 8 families, and 52 genera were collected. Species richness and diversity significantly increased from upstream to downstream. Canonical correspondence analysis (CCA) highlighted five environmental variables (altitude, conductivity, dissolved oxygen, channel width and current velocity) significantly structuring fish assemblages in the Chishui River. Based on species distributions and fish-habitat relationships, conservation strategies were proposed for different reaches. RÉSUMÉStructure des communautés piscicoles de la rivière Chishui, un affluent protégé du fleuve Yangtzé Cette étude caractérise les communautés de poissons et évalue l'influence environnementale sur la distribution piscicole dans la rivière Chishui, un affluent protégé du fleuve Yangtzé. Trente-et-un sites régulièrement répartis sur le profil longitudinal ont été échantillonnés en avril 2007. Soixante-six espèces de poissons appartenant à 3 ordres, 8 familles et 52 genres ont été collectées. La richesse et la diversité spécifique augmentent significativement de l'amont vers l'aval. L'analyse canonique des correspondances (CCA) identifie cinq variables environnementales (altitude, conductivité, oxygène dissous, largeur du lit et vitesse du courant), structurant significativement les communautés de poissons dans la rivière Chishui. À partir des distributions spécifiques et des relations habitat-poisson, des straté-gies de conservation sont proposées pour les différents biefs. Mots-clés :(1) Institute of Hydrobiology, Chinese Academy of Sciences, 7th southern road of East Lake,

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Section: > Fish-habitat Relationshipssupporting

confidence: 91%

Fish assemblage structure in the Chishui River, a protected tributary of the Yangtze River

Wang

et al. 2011

Knowl. Managt. Aquatic Ecosyst.

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Section: Discussionmentioning

confidence: 99%

“…Among cyprinoids, mostly the cyprinines (carps and minor carps) were observed to be dominant groups followed by rasborines (carp minnows / hill-trouts), garrines (suckerheads) and schizothoracines (snow trouts) (Edds 1993, Pokharel 1999, Champasri 2003. Likewise, the cyprinines (carps and minor carps) and rasborines (carp minnows / hilltrouts) have been mentioned to contribute to a major portion of the fish biota (Edds 1993, Pokharel 2006, Shrestha 2001, Swar 2005. Similar pattern of species composition, family and group dominance was observed in the present work and also the important species, Neolissocheilus hexagonolepis, Puntius sophore, P. conchonius, Barilius bendelisis, Garra gotyla and Schizothorax richardsonii were found to be dominant forms at most of the study sites.…”

Section: Discussionmentioning

confidence: 99%

Study on Fish Ecology of the Seti Gandaki River Pokhara: II. Spatio-Temporal Variations in Fish Communities

Pokharel

2012

Nepal Journal of Science and Technology

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Present paper deals with the spatio-temporal variations in distribution and abundance of fishes along the 30 km stretch of the Seti Gandaki river and its two major tributaries, Mardi Khola and Vijaypur Khola, in Pokhara Valley, Western Nepal. A total of 30 species of fishes belonging to 5 orders, 9 families and 22 genera were recorded from five sites on the river and its tributaries. Cyprinoids were predominant among fishes (17 spp.), siluroids (5 spp.), balitorids and cobitids (4 spp.), channioids (2 spp.), belonoids (one sp.) and mastacembeloids (one sp.). Among cyprinoids, mostly cyprinines were dominant groups (7 spp.) followed by rasborines (7 spp.), garrines (2 spp.) and schizothoracines (one sp.). There was increasing trend of species richness at upstream site (17 spp.). to downstream site (20 spp.) showing a longitudinal pattern. The total fish abundance and family-wise abundance at all the sites observed major peak during the spring and fall during the winter season in both the years of study. The average total density of fishes during the spring peak was highest (51.07/ha) at the upper tributary site and lowest (24.69/ha) at the urban site. According to the distribution pattern and abundance, the population status of the gamefish,

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“…Angermeier & Karr 1983, Ibarra & Stewart 1989, Wikramanayake 1990, Hugueny & Paugy 1995, Castro & Casatti 1997, Casatti et al 2001, Fogaça et al 2003, Barreto & Aranha 2005, Langeani et al 2007). Dentre as variações registradas na literatura, fica destacado que as menores diversidades ocorrem nas áreas de cabeceira ou próximas a ela enquanto nas áreas de desembocadura ou confluência o número de espécies é sempre superior (Matthews 1986, Edds 1993, Pavanelli & Caramaschi 1997, Abes & Agostinho 2001, Barreto & Uieda 1998, Uieda & Barreto 1999, Pavanelli & Caramaschi 2003, Bifi et al 2006, Perez-Jr. & Garavello 2007. No caso do presente estudo, os três riachos estudados foram amostrados em áreas de baixada, próximo à confluência com o rio Tocantins, fato que pode explicar a alta diversidade como função da ictiofauna Biota Neotrop.,vol.…”

Section: Discussionunclassified

Estrutura e persistência temporal da comunidade de peixes de três riachos do Alto Rio Tocantins, GO

Miranda

Mazzoni

2009

Biota Neotrop.

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Three streams from the upper Tocantins basin were studied in order to describe community structure and temporal persistence of fish species composition. Fish densities of each stream were compared between them and with other streams from Neotropical, Austral and Holartic regions. Forty six species were registered but only 18 co-occurred in the three studied streams. Two streams presented similar species composition, but temporal variations of species densities differed among them. High persistence was registered to Água Boa and Cavalo streams whereas low persistence was registered to Acaba Saco stream. No significant differences were registered for species densities of each studied stream, nonetheless, Cavalo were that tending to support the highest fish densities. The values of fish density found in the present study were very similar to those found in other geographic regions such as Temperate and Tropical areas. Resumo: Três riachos do alto rio Tocantins foram estudados para determinação da estrutura e persistência temporal das comunidades de peixes. As densidades das populações que compõem cada comunidade foram comparadas entre os três riachos estudados e entre os mesmos e alguns registros disponíveis para outros riachos das regiões Neotropical, Austral e Holártica. Registramos 46 espécies, sendo que apenas 18 espécies foram compartilhadas pelos três riachos. A análise de similaridade revelou que dois riachos têm composição de espécies muito similar, porém com variações temporais distintas. Os córregos Água Boa e Cavalo apresentaram alta persistência na estrutura de suas comunidades enquanto que para o córrego Acaba Saco registramos baixa persistência. Não houve diferença significativa nas densidades médias das espécies dos três córregos, sendo que o Cavalo foi aquele que apresentou tendência a suportar maiores densidades. Nossos resultados indicam que os valores de densidade registrados para os córregos estudados são similares a resultados registrados em outras regiões geográficas, como áreas Temperadas e Tropicais. Palavras-chave: bacia Araguaia-Tocantins, peixes de riacho, densidade, persistência, estabilidade.

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Fish Assemblage Structure and Environmental Correlates in Nepal's Gandaki River

Cited by 86 publications

References 17 publications

Fish assemblage structure in the Chishui River, a protected tributary of the Yangtze River

Fish assemblage structure in the Chishui River, a protected tributary of the Yangtze River

Study on Fish Ecology of the Seti Gandaki River Pokhara: II. Spatio-Temporal Variations in Fish Communities

Estrutura e persistência temporal da comunidade de peixes de três riachos do Alto Rio Tocantins, GO

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