Spatial variation in relative abundance of a widespread, numerically dominant fish species and its effect on fish assemblage structure

Oecologia ◽  
2000 ◽  
Vol 125 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Edie Marsh-Matthews ◽  
William J. Matthews
Keyword(s):  
Spatial Variation ◽  
Relative Abundance ◽  
Fish Species ◽  
Fish Assemblage ◽  
Assemblage Structure ◽  
Fish Assemblage Structure ◽  
Dominant Fish

scholarly journals Longitudinal patterns in distribution of native and non-native fish species in a regulated temperate Neotropical river

2021 ◽  
Vol 33 ◽  
Author(s):  
Andrea Bertora ◽  
Fabián Grosman ◽  
Pablo Sanzano ◽  
Juan José Rosso
Keyword(s):  
Dissolved Oxygen ◽  
Fish Species ◽  
Environmental Conditions ◽  
Fish Assemblage ◽  
Native Species ◽  
Assemblage Structure ◽  
Native Fish ◽  
Fish Assemblage Structure ◽  
Longitudinal Patterns ◽  
Tolerant Species

Abstract: Aim We evaluated the longitudinal patterns in distribution of native and non-native fish species in a hydrologically fragmented and environmentally variable lowland temperate river. Methods Four sites representing contrasting habitat and environmental conditions were sampled: a clear water reservoir, a turbid water lagoon and two river reaches with clear and turbid waters each. Environmental variables were measured in situ and in the laboratory. Fishes were sampled using trammel and beach seine nets. Results Two main environmental scenarios were identified: the upstream reaches, with colder, clearer and nutrient-oxygen poor waters (reservoir and its downstream river) and the downstream reaches, where turbidity, dissolved oxygen, water temperature, conductivity and nutrients largely increased (lagoon and its downstream river). Fourteen species with a high non-native/native (4:10) ratio were collected. Non-native species (NNS) were confined to lentic conditions, where the silverside Odontesthes bonariensis dominated. Native species (NS) better thrive in lotic conditions where the turbid scenario further favored tolerant species. Environmental conditions also seemed to influence the distribution of NNS. Fish assemblage structure considering either, all species, NNS or NS significantly differed among sampled reaches and habitat (lentic-lotic) conditions. Total fish abundance was higher in lentic reaches. Species richness and diversity were favored by the turbid scenario. Beta diversity was mostly explained by the replacement component revealing the substitution of species as the main pattern of variation. Water conductivity, nitrates and dissolved oxygen were the most important predictor variables in the best and most frequent explanatory models of fish assemblage structures. Conclusions Our results revealed that a low diversified Neotropical fish fauna is disrupted by habitat fragmentation due to the creation of artificial impoundments and the introduction of NNS. Environmental conditions further modulate the fish assemblage structure by affecting the distribution of species where tolerant species were favored by turbid, nutrient-rich waters with higher conductivity and pH.

Spatial variation in benthopelagic fish assemblage structure along coastal East Africa from recent bottom trawl surveys

2016 ◽  
Vol 8 ◽  
pp. 201-209 ◽  
Author(s):  
Boaz Kaunda-Arara ◽  
Cosmas Munga ◽  
Julius Manyala ◽  
Baraka Kuguru ◽  
Mathias Igulu ◽  
...  
Keyword(s):  
Spatial Variation ◽  
East Africa ◽  
Fish Assemblage ◽  
Assemblage Structure ◽  
Bottom Trawl ◽  
Fish Assemblage Structure ◽  
Trawl Surveys
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