Fish species richness and species diversity in the Uday river within the national nature park «Pyryatynsky»

The influence of spatial, temporal and environmental factors on fish species diversity in headwater streams in Paraguay and Paraná basins, Brazil was examined. A total of 4,605 individuals were sampled, distributed in 60 species. The sampled streams in Paraná basin presented a larger total species richness (42) than Paraguay streams (40). However the estimated richness was larger in Paraguay basin (53) than Paraná streams (50). The streams of Paraná basin had a greater mean species richness and evenness, while more individuals per sample were found in the Paraguay basin. Difference between the sub-basins were found in the Paraguay basin, while for the basin of Paraná, richness and evenness vary significantly between the sub-basins, but the number of individuals varied seasonally. The most important environmental factors to species diversity and abundance were altitude, water temperature, stream width and stream depth for both the basins.

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Surface water connectivity affects lake and stream fish species richness and composition

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/cjfas-2020-0090 ◽

2020 ◽

Author(s):

Katelyn B.S. King ◽

Mary Tate Bremigan ◽

Dana M Infante ◽

Kendra Spence Cheruvelil

Keyword(s):

Species Richness ◽

Surface Water ◽

Species Diversity ◽

Fish Species ◽

Spatial Scales ◽

Fish Communities ◽

Integrated Approach ◽

Stream Fish ◽

Recreational Resources ◽

Fish Species Diversity

Stream and lake fishes are important economic and recreational resources that respond to alterations in their surrounding watersheds and serve as indicators of ecological stressors on aquatic ecosystems. Research suggests that fish species diversity is largely influenced by surface water connectivity, or the lack thereof; however, few studies consider freshwater connections and their effect on both lake and stream fish communities across broad spatial extents. We used fish data from 559 lakes and 854 streams from the midwestern/northeastern United States to examine the role of surface water connectivity on fish species richness and community composition. We found that although lakes and streams share many species, connectivity had a positive effect on species richness across lakes and streams and helped explain species composition. Taking an integrated approach that includes both lake and stream fish communities and connectivity among freshwaters helps inform scientific understanding of what drives variation in fish species diversity at broad spatial scales and can help managers who are faced with planning for state, regional, or national scale monitoring and restoration.

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Temporal species turnover and plant community changes across different habitats in the Lake Engure Nature Park, Latvia

Proceedings of the Latvian Academy of Sciences Section B Natural Exact and Applied Sciences ◽

10.2478/prolas-2014-0006 ◽

2014 ◽

Vol 68 (1-2) ◽

pp. 68-79 ◽

Cited By ~ 1

Author(s):

Solvita Rūsiņa ◽

Ģertrūde Gavrilova ◽

Ieva Roze ◽

Viesturs Šulcs

Keyword(s):

Species Richness ◽

Species Diversity ◽

Vegetation Dynamics ◽

Species Turnover ◽

Dry Forest ◽

Latitudinal Gradients ◽

Nature Park ◽

The Stability ◽

Window Approach ◽

Temporal Species Turnover

Abstract Simultaneous monitoring of vegetation dynamics in different ecosystems has been rarely conducted but can provide important insights into mechanisms of vegetation dynamics in relation to vegetation structure and patterns. We compared the herb layer dynamics, species turnover, and species-time relationships across different habitats in a 12-year period in the ILTER monitoring station of the Lake Engure Nature Park, Latvia. Temporal species turnover was defined as diference in species composition in a community between two times. Species-time relationships were assessed using a sliding window approach. Species richness, cumulative species richness, and diversity changed more in species-rich non-forest habitats than in forests. Species turnover was highly different among habitats, and was not associated with the stability of habitats, as reported from other studies. The species-time relationship of six habitats was much lower than that reported in the literature. This could be explained by latitudinal gradients in species diversity and temporal turnover. At higher latitudes both species diversity and turnover is lower, and the mentioned habitats represent typical boreal vegetation. Vegetation dynamics in acidic grassland, dune slack, fen, and dune forest were interpreted as fluctuations. Vegetation changes in moist forest, dry forest, and coastal grassland showed clear signs of succession (xerophytisation and overgrowing). Vegetation dynamics of the beach community exhibited features of both natural succession and anthropogenic fluctuation.

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Linking fish and crustacean taxonomic composition with seasonal contrasts in the soft-bottom intertidal zone

Brazilian Journal of Biology ◽

10.1590/1519-6984.234129 ◽

2020 ◽

Author(s):

M. A. Gondal ◽

S. Iqbal ◽

U. Atique ◽

N. U. Saher ◽

N. A. Qureshi ◽

...

Keyword(s):

Species Richness ◽

Water Temperature ◽

Fish Species ◽

Diversity Index ◽

Taxonomic Composition ◽

Primary Objective ◽

Negative Effect ◽

Fish Species Composition ◽

One Year ◽

Sw Monsoon

Abstract The primary objective of this study was to investigate the seasonal fish and crustacean variations concerning taxonomic composition, species richness, and diversity in sandy beach habitat. For this purpose, we investigated the Sonmiani Hor lagoon area during four distinct seasons, i.e., northeast (NE) monsoon, pre-monsoon, south-west (SW) monsoon, and post-monsoon for one year. During each haul, the net was pulled about 100m along the beach in 0.5m depth. The results showed a strong linear correlation between the diversity index and equitability in fishes (r = 0.978). The diversity index was strong negatively correlated with the abundance and biomass (r = -0.978, -0.972, respectively). The physical attributes like sea surface water temperature and salinity showed a strong negative effect on species assemblages (r = -0.981 and -0.943, respectively). The mean air and water temperature illustrated approximately 3°C difference during NE and pre-monsoon seasons. However, salinity, pH, and electrical conductivity did not show any significant seasonal variabilities. Under the ecological indices, the fish species displayed higher diversity (H’ = 3.19) during SW monsoon, whereas the lowest diversity was observed during pre-monsoon (H’ = 1.58). The equitability and species richness, however, remained more noticeable during SW monsoon (J’ = 0.81). The total number of individuals of fish and crustaceans reached 4799 with 3813 fish individuals and 986 individuals of crustaceans. A total of 27 families of fish while five crustacean families comprising of 30 genera and 38 fish species while ten genera and 17 species of crustaceans were recorded. Liza subviridis displayed the highest abundance among the sampled fish species. In conclusion, fish species constituted a significant part of the coastal fauna in the study area. The seasonal variations displayed distinct variations in fish species composition and diversity.

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