scholarly journals How do spatial and environmental factors affect the fish community structure in seasonally flooded karst systems?

2020 ◽  
Vol 48 (2) ◽  
pp. 268-279
Author(s):  
Joel Loera-Pérez ◽  
José L. Hernández-Stefanoni ◽  
Xavier Chiappa-Carrara
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Environmental Variables ◽  
Fish Community ◽  
Saturation Temperature ◽  
Spatial And Temporal Variation ◽  
Western Coast ◽  
Fish Community Structure ◽  
Principal Coordinates ◽  
Seasonally Flooded

Spatial and temporal variation of the physical and chemical conditions of coastal karst wetland ecosystems, which annually range from flooded to completely dry, generate a very dynamic fish community structure. We assessed the relative influence of spatial dependence and environmental factors on fish community structure in a seasonally flooded tropical karst system on the north-western coast of the Yucatan Peninsula, Mexico. Sampling was carried out between November 2009 and April 2010, while the area was inundated by seasonal floodwater. Fish biomass, abundance and species richness, as well as environmental variables and geographic location, were recorded. A variation partitioning analysis was performed to assess the influence of the spatial and environmental variables on the fish community using multiple regression, and a principal coordinates analysis of neighbor matrices (PCNM). Spatial factors had a greater influence on the changes in the community structure than the environmental factors. After spatial variation, environmental effects from conductivity, oxygen saturation, temperature and depth further shaped the community. These results imply that, despite the diversity of niches and wide variation in environmental conditions, the structuring force of the community is the spatial dynamic probably linked to species dispersal mechanisms and reproductive strategies.

scholarly journals Characterization of Fish Community Structure And Development of An Estuarine Fish Community Index For Temporarily Closed Estuaries (TCEs) From India’s Western Coast

2021 ◽  
Author(s):  
Kiranya Bella ◽  
Pramila Sahadevan ◽  
Sreekanth Giri Bhavan ◽  
Appukuttannair Bijukumar ◽  
Rajeev Raghavan
Keyword(s):  
Community Structure ◽  
Fish Community ◽  
Estuarine Fish ◽  
Feeding Guilds ◽  
Western India ◽  
Western Coast ◽  
Anthropogenic Pressure ◽  
Fish Assemblage Structure ◽  
Ecological Quality ◽  
Fish Community Structure

Abstract We present for the first-time data on fish assemblage structure for ten temporarily closed estuaries (TCEs) along the western coast of India. Fish community structure differed significantly between TCEs based on species presence/absence, estuarine use and feeding mode - differences based on estuarine surface area and geographical position (northern and southern locations). Marine migrant and freshwater stragglers dominated the ‘fish guilds’ in all estuaries, while piscivores and zoobenthivores were the major feeding guilds. We used the estuarine fish community index (EFCI) and a combined anthropogenic pressure index (CPI) to determine ecological quality of the TCEs. The application of functional guilds and EFCI could represent the use of TCEs by fish communities, and functional similarities existing between fish assemblages of these estuaries, despite considerable taxonomic, physical and chemical differences. Analysis of EFCI indicated that the ecological health of TCEs in south-western India ranges from “poor” to “good”. Through this index, we also established a significant relationship between CPI, EFCI and ecological quality in various TCEs (EFCI = A + (b X CPI)). Thus, the EFCI provides an integrated measure of the ecological status of fish community for TCEs along Indian coast.

scholarly journals Spatial and Temporal Variation of Fish Assemblages in Seti Gandaki River, Tanahu, Nepal

2020 ◽  
Vol 10 (2) ◽  
pp. 93-104
Author(s):  
ARCHANA PRASAD ◽  
ANJANA SHRESTHA ◽  
JASH HANG LIMBU ◽  
DEEP SWAR
Keyword(s):  
Community Structure ◽  
Fish Community ◽  
Fish Assemblages ◽  
Mesh Size ◽  
Spatial And Temporal Variation ◽  
Total Hardness ◽  
Medium Size ◽  
Fish Community Structure ◽  
Space And Time ◽  
Significant Difference

The space and time variations of the fish community structure in hill streams of Nepal are poorly understood. This research aims at studying the space and time variation of fish community structure in the Seti Gandaki River, Tanahu, Nepal. The field survey was conducted from July 2017 to June 2018 and the fishes were sampled from six sites using a medium size cast net of mesh size ranging from 3 mm to 6 mm mesh size, 25-33 feet length and 3.5-5 feet width, with the help of local fisher man. A total of 1,440 individuals were caught representing 46 species belonging to three order, nine families and 23 genera. The analysis of similarity (ANOSIM) showed significant difference in space (R = 0.824, P = 0.001) but not in time (R = 0.135, P = 0.021). On the basis of similarity percentage (SIMPER) analysis, 85.43% similarity was found among the seasons and major contributing species were Barilius bendelisis (8.44%) followed by B. vagra (7.79%), Tor putitora (7.27%), Garra gotyla (7%), Acanthocobotis botia (6.7%), Neolissochilus hexagonolepis (6.64%), Barilius shacra (6%), B. barila (4.5%) and Opsarius barna (4.37%). On the other hand, 85.24% similarity was found among the sites and major contributing species were B. bendelisis (8.8%) followed by B. vagra (7.6%), G. gotyla (7.27%), T. putitora (7.17%), A. botia (6.97%), N. hexagonolepis (6.7%), B. shacra (6.34%), B. barila (4.7%) and O. barna (4.39%). Results from the Canonical Correspondence Analysis indicated that the environmental variables, such as pH, total hardness, alkalinity, dissolved oxygen and water temperature have shown to determine the fish community structure of Seti Gandaki River. Keywords: Fish diversity, freshwater, habitat, spatio-temporal, stream

scholarly journals Environmental factors predicting fish community structure in two neotropical rivers in Brazil

2007 ◽  
Vol 5 (1) ◽  
pp. 61-68 ◽  
Author(s):  
Yzel Rondon Súarez ◽  
Miguel Petrere Júnior
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Species Composition ◽  
Species Distribution ◽  
Fish Community ◽  
Abundant Species ◽  
Longitudinal Variation ◽  
Fish Community Structure ◽  
Gill Nets ◽  
The Difference

In order to assess the organization patterns of the fish communities in the Jogui and Iguatemi rivers, we collected fish with gill nets tri-monthly from November 1999 to August 2000. Hypostomus ancistroides and Parauchenipterus galeatus were the most abundant species in the Jogui and Iguatemi rivers, respectively. Longitudinal variation was more important than seasonal in determining the species composition in both rivers, and the difference between seasons was not statistically significant. Altitude was the most important factor determining species distribution.

scholarly journals A study of the fish community structure in a tidal creek

2004 ◽  
Vol 64 (2) ◽  
pp. 337-351 ◽  
Author(s):  
H. L. Spach ◽  
C. Santos ◽  
R. S. Godefroid ◽  
M. Nardi ◽  
F. Cunha
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Fish Community ◽  
Tidal Creek ◽  
High Tide ◽  
Current Speed ◽  
Water Transparency ◽  
Fish Community Structure ◽  
Total Capture ◽  
Biological Patterns

The fish assemblage in a mangrove tidal creek was studied in monthly collections between August 1998 and July 1999 in the quadrature low tide and high tide, using a fyke net of 30 m x 1.5 m and meshes of 8 and 10 mm. Simultaneously with the biological collections, temperature, salinity, pH, water transparency, and current speed data were obtained. The collections resulted in the capture of 36,873 fish representing 22 families and 52 species. Immature individuals abounded (63.8%), and among the adult specimens there was a larger number of females. The species Anchoa parva, Harengula clupeola, Genidens genidens, and Bairdiella ronchus, contributed to 84.9% of the total capture of fish, however the contribution in mass was of 55.2%, indicating a predominance of small individuals. A smaller number of fish and species seem to occupy the area in the period between August and December, in comparison to the period between February and July, when the larger aggregations appear, mainly of the species Anchoa parva, Harengula clupeola, Opisthonema oglinum, Genidens genidens, Diapterus rhombeus, and Bairdiella ronchus. The environmental factors, pH, water transparency, and rainfall seem to have an influence in the structure of the observed biological patterns.

scholarly journals Spatial and temporal variation in fish community structure of a marine embayment in Zanzibar, Tanzania

Hydrobiologia ◽  
2007 ◽  
Vol 586 (1) ◽  
pp. 1-16 ◽  
Author(s):  
B. R. Lugendo ◽  
A. de Groene ◽  
I. Cornelissen ◽  
A. Pronker ◽  
I. Nagelkerken ◽  
...  
Keyword(s):  
Community Structure ◽  
Temporal Variation ◽  
Fish Community ◽  
Spatial And Temporal Variation ◽  
Fish Community Structure ◽  
Marine Embayment

scholarly journals How fish traits and functional diversity respond to environmental changes and species invasion in the largest river in Southeastern China

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e11824
Author(s):  
Li Lin ◽  
Weide Deng ◽  
Xiaoxia Huang ◽  
Yang Liu ◽  
Liangliang Huang ◽  
...  
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Freshwater Fish ◽  
Functional Diversity ◽  
Community Assembly ◽  
Fish Community ◽  
Fish Community Structure ◽  
Species Invasion ◽  
Southeastern China ◽  
Functional Richness

Background Freshwater fish populations are facing multiple stressors, including climate change, species invasion, and anthropogenic interference. Temporal studies of fish functional diversity and community assembly rules based on trait-environment relationships provide insights into fish community structure in riverine ecosystems. Methods Fish samples were collected in 2015 in the Min River, the largest freshwater riverine system in Southeastern China. Fish functional diversity was compared with the background investigation in 1979. Changes in functional richness, functional evenness, functional divergence, and functional beta diversity were analyzed. Relationships between functional diversity and environmental factors were modeled by random forest regression. Correlations between fish functional traits and environmental factors were detected by fourth-corner combined with RLQ analysis. Results Functional richness was significantly reduced in 2015 compared with 1979. Functional beta diversity in 2015 was significantly higher than that in 1979, with functional nestedness being the driving component. Reduction of functional richness and domination of functional nestedness is associated with species loss. Trait convergence was the dominant mechanism driving the temporal changes of functional diversity. Precipitation, temperature, species invasion, and human population were the most significant factors driving fish functional diversity. Higher precipitation, higher temperature, and presence of invasive species were significantly associated with higher swimming factor and higher relative eye diameter, while the opposite environmental conditions were significantly associated with higher pectoral fin length and eurytopic water flow preference. Conclusions Environmental filtering is the dominant temporal assembly mechanism shaping fish community structure. This work contributes to the understanding of temporal freshwater fish community assembly and the associations between fish functional structure and local environmental conditions, which will be informative for future freshwater fish conservation.

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