Accounting for variation in species detection in fish community monitoring

2013 ◽  
Vol 21 (2) ◽  
pp. 96-112 ◽  
Author(s):  
R. A. McManamay ◽  
D. J. Orth ◽  
H. I. Jager
Keyword(s):  
Fish Community ◽  
Species Detection ◽  
Community Monitoring

scholarly journals 2005 Annual Synthesis Report, Pallid Sturgeon Population Assessment Program and Associated Fish Community Monitoring for the Missouri River

2008 ◽  
Author(s):  
Eric W. Oldenburg ◽  
Timothy P. Hanrahan ◽  
Ryan A. Harnish ◽  
Brian J. Bellgraph ◽  
Joanne P. Duncan ◽  
...  
Keyword(s):  
Fish Community ◽  
Missouri River ◽  
Population Assessment ◽  
Assessment Program ◽  
Pallid Sturgeon ◽  
Community Monitoring ◽  
Synthesis Report

scholarly journals Comparison of Fish Catch Between an Electric Seine and Backpack Electrofishers in Shoal Habitat of the Chipola River, Florida

2017 ◽  
Vol 9 (1) ◽  
pp. 36-44
Author(s):  
Ted Alfermann ◽  
Andy Strickland ◽  
Christopher Middaugh ◽  
Phong Nguyen ◽  
Erin Leone
Keyword(s):  
Fish Community ◽  
Relative Effectiveness ◽  
Monitoring Program ◽  
Large River ◽  
Comparison Study ◽  
Community Monitoring ◽  
Fish Catch ◽  
River Shoals ◽  
Habitat Variables

Abstract We conducted a gear comparison study to determine the best fish-sampling methodology in shoal habitat to assist with the development of a long-term fish community monitoring program on the Chipola River, Florida. Shoal habitat occurs throughout the southeastern United States, is shallow (< 1 m), and contains rock substrate and outcroppings, which limits boat electrofishing to the habitat margins. We compared the relative effectiveness of an electric seine and backpack electrofishers. Twenty-five randomly selected sites (4 m wide by 5 m long) per gear type were block netted and sampled across four shoals from August 28 to October 3, 2014. Habitat variables were recorded for each site. Using backpack electrofishers, 1,155 fish representing 21 species were collected. Using the electric seine, 1,036 fish representing 22 species were collected. We found no significant differences between gear types in mean total catch per site, mean species richness per site, Shannon's diversity, Simpson's dominance, Pielou's evenness, or the rate of species accumulation. Therefore, we consider the two gear types to be equally effective for block-netted sites in large river shoals. Differences in available equipment, funding, and personnel were compared and may ultimately determine which gear type is used in future studies.

Assessing the sensitivity and specificity of fish community indicators to management action

2012 ◽  
Vol 69 (6) ◽  
pp. 1065-1079 ◽  
Author(s):  
Jennifer E. Houle ◽  
Keith D. Farnsworth ◽  
Axel G. Rossberg ◽  
David G. Reid
Keyword(s):  
Sensitivity And Specificity ◽  
Fish Community ◽  
Ecosystem Approach ◽  
Large Species ◽  
Fishing Pressure ◽  
Fishing Mortality ◽  
Size Selection ◽  
Community Model ◽  
Community Monitoring ◽  
Specific Biomass

We assessed ten trophodynamic indicators of ecosystem status for their sensitivity and specificity to fishing management using a size-resolved multispecies fish community model. The responses of indicators to fishing depended on effort and the size selectivity (sigmoid or Gaussian) of fishing mortality. The highest specificity against sigmoid (trawl-like) size selection was seen from inverse fishing pressure and the large fish indicator, but for Gaussian size selection, the large species indicator was most specific. Biomass, mean trophic level of the community and of the catch, and fishing in balance had the lowest specificity against both size selectivities. Length-based indicators weighted by biomass, rather than abundance, were more sensitive and specific to fishing pressure. Most indicators showed a greater response to sigmoid than Gaussian size selection. Indicators were generally more sensitive at low levels of effort because of nonlinear sensitivity in trophic cascades to fishing mortality. No single indicator emerged as superior in all respects, so given available data, multiple complementary indicators are recommended for community monitoring in the ecosystem approach to fisheries management.

Problems Associated with Fisheries Assessment Methods in the Great Lakes

1987 ◽  
Vol 44 (S2) ◽  
pp. s431-s438 ◽  
Author(s):  
W. J. Christie ◽  
Chris I. Goddard ◽  
Stephen J. Nepszy ◽  
John J. Collins ◽  
Wayne MacCallum
Keyword(s):  
Water Quality ◽  
Great Lakes ◽  
Fish Community ◽  
Fishery Management ◽  
Material Resources ◽  
Community Monitoring ◽  
Observation Series ◽  
Special Circumstances ◽  
Assessment Problems ◽  
Ongoing Monitoring

This paper presents a review of Great Lakes fishery assessment problems and addresses the variety of fisheries, the special circumstances created by rehabilitation, the emergence of joint strategic planning among fishery agencies, and convergence of water quality and fishery management. The inferences that emerge are that (1) continuing observation series are essential, (2) the variety of needs calls for a variety of assessment approaches, and (3) assessment objectives need to be clearly defined in order to protect the ongoing monitoring series. It is suggested that more attention should be given to fish community monitoring, to sport fishery statistics, and to gear calibration. On the other hand, improved coordination of human and material resources and focus on integration of water quality and fisheries assessment can achieve much, without great funding increases.

Dominance determines fish community biomass in a temperate seagrass ecosystem

2019 ◽  
Author(s):  
Aaron Matthius Eger ◽  
Rebecca J. Best ◽  
Julia Kathleen Baum
Keyword(s):  
Species Richness ◽  
Ecosystem Function ◽  
Fish Community ◽  
Prey Capture ◽  
Fish Communities ◽  
Functional Trait ◽  
Ecosystem Functions ◽  
Community Biomass ◽  
Ecosystem Valuation ◽  
Species Abundances

Biodiversity and ecosystem function are often correlated, but there are multiple hypotheses about the mechanisms underlying this relationship. Ecosystem functions such as primary or secondary production may be maximized by species richness, evenness in species abundances, or the presence or dominance of species with certain traits. Here, we combined surveys of natural fish communities (conducted in July and August, 2016) with morphological trait data to examine relationships between diversity and ecosystem function (quantified as fish community biomass) across 14 subtidal eelgrass meadows in the Northeast Pacific (54° N 130° W). We employed both taxonomic and functional trait measures of diversity to investigate if ecosystem function is driven by species diversity (complementarity hypothesis) or by the presence or dominance of species with particular trait values (selection or dominance hypotheses). After controlling for environmental variation, we found that fish community biomass is maximized when taxonomic richness and functional evenness is low, and in communities dominated by species with particular trait values – those associated with benthic habitats and prey capture. While previous work on fish communities has found that species richness is positively correlated with ecosystem function, our results instead highlight the capacity for regionally prevalent and locally dominant species to drive ecosystem function in moderately diverse communities. We discuss these alternate links between community composition and ecosystem function and consider their divergent implications for ecosystem valuation and conservation prioritization.

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