An evaluation of single-pass versus multiple-pass backpack electrofishing to estimate trends in species abundance and richness in prairie streams

Bertrand, Katie N.; Gido, Keith B.; Guy, Christopher S.

doi:10.1660/0022-8443(2006)109[131:aeosvm]2.0.co;2

Cited by 58 publications

(51 citation statements)

References 13 publications

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“…A combination of straight and bag seines (4.7-mm mesh) and DC-pulsed backpack or tote-barge electrofishing were used to capture fish and effort was standardized (i.e., one pass for each gear type) across all sites. Bertrand et al (2006) compared estimates of relative abundance of minnows in prairie streams based on one-and three-pass electrofishing and showed that one-pass estimates of relative abundance were highly concordant with threepass estimates.…”

Section: Environmental Niche Modelsmentioning

confidence: 99%

Towards a mechanistic understanding of fish species niche divergence along a river continuum

Troia

Gido

2014

Ecosphere

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Abstract. Environmental niche modeling is a valuable tool but it often fails to identify causal links between environmental gradients and individual-or population-level performance that drive species' distributions. Correlation between the abundances of stream fish species and longitudinal position in stream networks is well documented and is hypothesized to occur through differential environmental filtering of trophic traits. Still, trophically similar congeners often exhibit complementary distributions along stream size gradients, suggesting that other mechanisms are important. We present niche models to test the hypothesis that four congeneric pairs (Teleostei: Cyprinidae) exhibit complementary distributions along a gradient of stream size in the central Great Plains of Kansas, USA. Stream size was the strongest predictor of abundance compared to five other environmental variables tested and three of the four species pairs exhibited complementary distributions along a stream size gradient. We carried out field experiments to quantify potentially causal environmental gradients (food resources, temperature, and turbidity) and four measures of individual performance (adult spawning success and juvenile survival, condition, and growth) along a stream size gradient for one congeneric pair: Pimephales notatus, a tributary species and P. vigilax, a river mainstem species. These experiments revealed an increase in temperature and food resources with stream size, along with a corresponding increase in adult spawning success, juvenile condition, and juvenile growth for both species. We conclude that these congeners respond similarly to abiotic gradients associated with the river continuum and that complementary distributions are a consequence of biotic interactions, differential environmental filtering evident in an unmeasured performance metric, or differential environmental filtering by a direct environmental gradient operating at longer timescales.

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Section: Environmental Niche Modelsmentioning

confidence: 99%

Towards a mechanistic understanding of fish species niche divergence along a river continuum

Troia

Gido

2014

Ecosphere

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“…Sampling was conducted through a single-pass at each location without block-nets along a minimum of 100 m stretches whenever possible, covering all habitats available at this scale following the recommendations of the FAME Consortium (2004) for European rivers. This sampling method was selected to adequately characterize spatial trends in abundance and species richness (Bertrand et al 2006, Sa´ly et al 2009). All fish were identified to species and returned to the water.…”

Section: Fish and Habitat Datamentioning

confidence: 99%

Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss

Hermoso

Clavero

Blanco³

et al. 2011

Ecological Applications

169

124

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Abstract. Mediterranean endemic freshwater fish are among the most threatened biota in the world. Distinguishing the role of different extinction drivers and their potential interactions is crucial for achieving conservation goals. While some authors argue that invasive species are a main driver of native species declines, others see their proliferation as a co-occurring process to biodiversity loss driven by habitat degradation. It is difficult to discern between the two potential causes given that few invaded ecosystems are free from habitat degradation, and that both factors may interact in different ways.Here we analyze the relative importance of habitat degradation and invasive species in the decline of native fish assemblages in the Guadiana River basin (southwestern Iberian Peninsula) using an information theoretic approach to evaluate interaction pathways between invasive species and habitat degradation (structural equation modeling, SEM). We also tested the possible changes in the functional relationships between invasive and native species, measured as the per capita effect of invasive species, using ANCOVA.We found that the abundance of invasive species was the best single predictor of natives' decline and had the highest Akaike weight among the set of predictor variables examined. Habitat degradation neither played an active role nor influenced the per capita effect of invasive species on natives. Our analyses indicated that downstream reaches and areas close to reservoirs had the most invaded fish assemblages, independently of their habitat degradation status. The proliferation of invasive species poses a strong threat to the persistence of native assemblages in highly fluctuating environments. Therefore, conservation efforts to reduce native freshwater fish diversity loss in Mediterranean rivers should focus on mitigating the effect of invasive species and preventing future invasions.

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“…Much less is known about the relative efficacy of double or multiple-pass removals compared with the reach length optimization based single-pass method. In fact, most studies suggest that single-pass surveys of longer stream reaches are more effective than multiple-pass depletion of shorter sections for assessing reach level assemblage attributes (Paller, 1995;Reynolds et al, 2003;Bertrand et al, 2006;Reid et al, 2009), while others argue for the opposite sampling strategy (Kennard et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…If the purpose is to analyse spatial and temporal patterns in assemblage level attributes double-pass electrofishing may mean a compromise, because the most important variables (i.e. species richness, composition and relative abundance) usually do not change significantly after the second or in most cases even the first pass (Bertrand et al, 2006;Humpl and Lusk, 2006;Reid et al, 2009). However, the relative efficiency of single-pass electrofishing of longer sections vs. the double-pass surveys of shorter reaches in estimating assemblage level variables is largely unknown.…”

Section: Introductionmentioning

confidence: 99%

Assemblage level monitoring of stream fishes: The relative efficiency of single-pass vs. double-pass electrofishing

et al. 2009

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An evaluation of single-pass versus multiple-pass backpack electrofishing to estimate trends in species abundance and richness in prairie streams

Cited by 58 publications

References 13 publications

Towards a mechanistic understanding of fish species niche divergence along a river continuum

Towards a mechanistic understanding of fish species niche divergence along a river continuum

Invasive species and habitat degradation in Iberian streams: an analysis of their role in freshwater fish diversity loss

Assemblage level monitoring of stream fishes: The relative efficiency of single-pass vs. double-pass electrofishing

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