scholarly journals Comparison of Sampling Methods for Small Oxbow wetland Fish Communities

2021 ◽  
Author(s):  
Dylan M Osterhaus ◽  
Samuel S Leberg ◽  
Clay L Pierce ◽  
Timothy W Stewart ◽  
Audrey McCombs
Keyword(s):  
Fish Communities ◽  
Taxonomic Diversity ◽  
Primary Objective ◽  
Optimal Method ◽  
Wetland Ecosystems ◽  
Management Objectives ◽  
Community Data ◽  
Notropis Topeka ◽  
Topeka Shiner ◽  
Monitoring Protocols

Abstract The value of wetland ecosystems is becoming increasingly recognized, promoting actions needed to preserve and restore them. Post-restoration monitoring is necessary to analyze restoration success or failure, thereby informing subsequent management decisions. Standardized monitoring protocols enable comparison of responses to restoration actions. Within the Midwestern United States, restoration of oxbow wetlands has become the focus of targeted restoration. Management objectives include recovery of biodiversity and sensitive species, and enhanced ecosystem services. The fish communities of oxbows have been the subject of many monitoring studies as endangered Topeka Shiner ( Notropis topeka ) use these habitats for spawning. However, an optimal method for monitoring Topeka Shiner and other fishes in oxbows has not been described, thereby limiting our capacity to effectively manage these ecosystems. With a primary objective of identifying a standardized protocol for sampling fish in oxbow wetlands, we compared efficacy of four sampling methodologies (backpack electrofishing, fyke netting, minnow trapping, and seining) for fish community data collection. Seining and fyke netting were determined to be the most effective methods for sampling oxbow fish communities. Although seining and fyke netting produced similar taxonomic diversity and abundance values, qualitative analysis revealed that seining caused greater habitat disturbance and stress to fish. Therefore, consideration must be given to how species present within the wetland could be impacted by sampling disturbance when choosing between seining and fyke netting.

Elasmobranch diversity, conservation and management along Wadge Bank, South India

2019 ◽  
Author(s):  
K. Karuppasamy ◽  
P. Jawahar ◽  
S. David Kingston ◽  
V. K. Venkataramani ◽  
V. Vidhya
Keyword(s):  
Species Richness ◽  
Phylogenetic Diversity ◽  
South India ◽  
Fish Communities ◽  
Taxonomic Diversity ◽  
Management Measures ◽  
Conservation And Management ◽  
D Value

The study was undertaken to document the elasmobranch diversity and their abundance along Wadge Bank. Species were collected fortnightly during June 2015 to May 2016 from three landing centres viz., Chinnamuttom,Colachel and Vizhinjam of Wadge Bank. A total of 1,575 specimens were collected during the period and 44 species were identified belonging to 8 orders, 13 families and 25 genera. Among the recorded \families,Carcharhinidae is the most dominant family with 12 species. The Colachel landing centre was rich in diversity with 43 species followed by Chinnamuttom 39 species and Vizhinjam26 species. The highest Shannon Weiner diversity (H’ value) was observed at Colachel (4.17) followed by Chinnamuttom (4.11) and Vizhinjam (3.76). The Margalef’s species richness (‘d’) value was assessed at Colachel (4.55) followed by Chinnamuttom (4.01) and Vizhinjam (2.91). The Pielou’s evenness (J’) estimated was 0.7786, 0.7700 and 0.8005respectively, for Chinnamuttom, Colachal and Vizhinjam. The highest taxonomic diversity value was observed at Colachel (60.33) and the lowest during at Vizhinjam (54.08). Among the three landing centres studied, the total phylogenetic diversity (sPhi+) was found to be the lowest at Vizhinjam (940) and highest at Colachel landing centre (1720). Bray Curtis similarities measure was also calculated, fish communities were separated into several clusters based on seasons. The conservation of elasmobranchs and the management measures to be followed along the Wadge Bank is also discussed.

scholarly journals Influences of the area, shape and connectivity of coastal lakes on the taxonomic and functional diversity of fish communities in Southern Brazil

2019 ◽  
Vol 36 ◽  
pp. 1-12 ◽  
Author(s):  
Sandra Maria Hartz ◽  
Elise Amador Rocha ◽  
Fernanda Thiesen Brum ◽  
André Luís Luza ◽  
Taís de Fátima Ramos Guimarães ◽  
...  
Keyword(s):  
Functional Diversity ◽  
Fish Communities ◽  
Taxonomic Diversity ◽  
Analytical Framework ◽  
Freshwater Species ◽  
Coastal Lakes ◽  
Causal Connections ◽  
Functional Richness ◽  
Dispersal Abilities ◽  
Functional Evenness

In this study we investigated the influence of landscape variables on the alpha taxonomic and functional diversity of fish communities in coastal lakes. We built an analytical framework that included possible causal connections among variables, which we analyzed using path analysis. We obtained landscape metrics for the area, shape and connectivity (estuary connectivity and primary connectivity to neighboring lakes) of 37 coastal lakes in the Tramandaí River Basin. We collected fish data from 49 species using standardized sampling with gillnets and obtained a set of traits related to dispersal abilities and food acquisition. The model that best explained the taxonomic diversity and functional richness took into account the shape of the lakes. Functional richness was also explained by estuary connectivity. Functional evenness and dispersion were not predicted by area or connectivity, but they were influenced by the abundant freshwater species. This indicates that all lakes support most of the regional functional diversity. The results highlight the importance of the dispersal process in this lake system and allow the conclusion that considering multiple diversity dimensions can aid the conservation of local and regional fish communities.

Landscape Influences on Stream Habitats and Biological Assemblages

2006 ◽  
Keyword(s):  
Great Plains ◽  
Spatial Scales ◽  
Management Strategies ◽  
Groundwater Potential ◽  
Physical Habitat ◽  
Habitat Features ◽  
Notropis Topeka ◽  
Using Data ◽  
Topeka Shiner ◽  
Valley Segment

<em>Abstract.</em>—The Topeka shiner <em>Notropis topeka </em>is a small cyprinid listed as endangered in 1999 due to an 80% reduction in its former range across six Great Plains states. Conservation and recovery plans require information on structural indices of existing populations, distribution, and habitat relations at several spatial scales. We examined physical habitat associations of Topeka shiners at the valley segment and reach scales, and associations with fish species using stepwise logistic regression. Fish and habitat data were collected at 52 sites. Habitat features at the valley segment scale were acquired using data from a geographic information system. At the valley segment scale, Topeka shiners were associated with stream condition variables (stream size, groundwater potential, channel slope, streamflow, network position) and land-cover variables (% pasture, % trees). At the reach scale, Topeka shiners were associated with low grazing and small trees in riparian zones, low bank height, less submerged vegetation, and coarse substrates. Topeka shiners were associated with five fishes that inhabit small, intermittent, warmwater streams. Evidence of greater abundance of Topeka shiner populations in our region compared to other regions may be a result of the natural character of the streams and associated wetlands, which can influence the habitat variables associated with Topeka shiners at both scales. We identified management strategies that would be effective at conserving habitat of Topeka shiners at large and local scales.

Challenges to Reintroduction of a Captive Population of Topeka Shiner (Notropis topeka) into Former Habitats in Kansas

2016 ◽  
Vol 119 (1) ◽  
pp. 83-92 ◽  
Author(s):  
Scott W. Campbell ◽  
Cody S. Szuwalski ◽  
Vernon M. Tabor ◽  
Frank deNoyelles
Keyword(s):  
Captive Population ◽  
Notropis Topeka ◽  
Topeka Shiner

Fish-habitat modeling for gap analysis to conserve the endangered Topeka shiner (Notropis topeka)

2004 ◽  
Vol 61 (6) ◽  
pp. 954-973 ◽  
Author(s):  
Steven S Wall ◽  
Charles R Berry, Jr. ◽  
Carmen M Blausey ◽  
Jonathan A Jenks ◽  
Chad J Kopplin
Keyword(s):  
Land Cover ◽  
Species Distribution ◽  
Gap Analysis ◽  
Spatial Scales ◽  
Habitat Modeling ◽  
Fish Distribution ◽  
Geographical Information ◽  
Stream Condition ◽  
Notropis Topeka ◽  
Topeka Shiner

Decision support tools that predict fish distribution over broad spatial scales are needed to assist in planning watershed management and endangered species recovery. We developed a geographical information system model with multivariate logistic regression to rank valley segments for probable occurrence of the endangered Topeka shiner (Notropis topeka) using stream condition variables (stream size, groundwater potential, channel slope, streamflow, network position) and land-cover variables (percent pasture, percent trees) in streams characteristic of the North American Great Plains. The stream condition and land-cover models correctly classified 89% and 68% of outcomes (i.e., presence or absence), respectively. Field tests of maps of predicted species distribution resulted in more species occurrences than expected in valley segments classified as high potential for presence and less than expected in low-potential valley segments. Gaps between high-priority segments and protected land parcels were found in all basins. In 37 basins with Topeka shiners, protected land coverage was <1% in 17 basins, 1–5% in 10 basins, and 5–21.8% in 10 basins. Conservation activities in gaps are long-term conservation measures, but maps of predicted species distribution have many immediate applications.

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