Use of Dynamic Occupancy Models to Assess the Response of Darters (Teleostei: Percidae) to Varying Hydrothermal Conditions in a Southeastern United States Tailwater

Shea, Colin P.; Bettoli, Phillip W.; Potoka, Kathryn M.; Saylor, Charles; Shute, Peggy W.

doi:10.1002/rra.2766

Cited by 17 publications

(15 citation statements)

References 71 publications

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“…Stream fish ecologists have used dynamic multi‐species occupancy models similar to our worked example (e.g. Peterson & Shea, ; Shea, Bettoli, Potoka, Saylor & Shute, ). In these applications, observed temporal sequences of state transitions (e.g.…”

Section: Implementing Rates Approachesmentioning

confidence: 99%

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States and rates: Complementary approaches to developing flow‐ecology relationships

Wheeler

Wenger

Freeman³

2017

Freshwater Biology

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In recognition of the influence of flow on riverine habitats and organisms, stream ecologists have devoted considerable effort to the development of quantitative predictive relationships describing ecological responses to flow variability, i.e. flow‐ecology relationships. Methods used to generate flow‐ecology relationships can be thought of as a continuum bookended by pure states approaches on one end and by rates approaches on the other. In pure states approaches, the ecological response is a snapshot of a condition or property (i.e. a state) derived from a single measurement in time. In contrast, ecological responses in rates approaches reflect temporal change (i.e. a rate) and are thus reliant on repeated measurements made over time. Here, we elaborate on the fundamental characteristics of different approaches (pure states, rates and an intermediate approach we call repeated states) for generating flow‐ecology relationships, examine how commonly the different approaches are used in the flow‐ecology literature, conduct an independent analysis to illustrate the different outcomes achieved by applying repeated‐states and rates approaches using a dataset for stream fish diversity in relation to flow magnitude, and identify some of the different ways ecologists are applying rates approaches in flow ecology. Our literature review revealed that repeated‐states approaches (53% of reviewed studies) were used far more commonly than either pure states (19%) or rates (12%) approaches to generate flow‐ecology relationships. The remaining hybrid studies (17%) used both state and rate responses, and thus also relied on repeated measurements over time. Despite frequent collection of data suitable for rates approaches, flow‐ecology relationships have generally been developed using states approaches that relate changes in ecological states to different long‐term average flow conditions, rather than to specific flow sequences over much shorter time intervals. Such flow‐ecology relationships cannot generate temporally specific predictions of ecological responses to changing flow conditions (i.e. the expected change in state following a specific flow sequence), nor can they describe demographic processes underlying observed changes. While there are different scenarios in which a pure or repeated‐states approach would be useful, more frequent use of rates approaches would increase our ability to test flow‐ecology hypotheses and our mechanistic understanding of flow‐ecology relationships.

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Section: Implementing Rates Approachesmentioning

confidence: 99%

“…Stream fish ecologists have used dynamic multi-species occupancy models similar to our worked example (e.g. Peterson & Shea, 2015;Shea, Bettoli, Potoka, Saylor & Shute, 2015).…”

Section: Implemen Ting Rates Approache Smentioning

confidence: 99%

States and rates: Complementary approaches to developing flow‐ecology relationships

Wheeler

Wenger

Freeman³

2017

Freshwater Biology

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“…Basic model. We used the binary representation of the survey data to estimate occupancy dynamics by fitting a multiyear, multitaxa model to the data for each river (Royle and Kéry 2007;Peterson and Shea 2015;Shea et al 2015). Specifically, we modeled the observed detection (1) or nondetection (0) for each of the 26 (Conasauga model) or 28 (Etowah model) species at every site surveyed in a given year, as the result of two linked processes: dynamic occupancy and sampling.…”

Section: Analysesmentioning

confidence: 99%

Long-Term Monitoring Data Provide Evidence of Declining Species Richness in a River Valued for Biodiversity Conservation

Freeman

Hagler

Bumpers

et al. 2017

Journal of Fish and Wildlife Management

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Free-flowing river segments provide refuges for many imperiled aquatic biota that have been extirpated elsewhere in their native ranges. These biodiversity refuges are also foci of conservation concerns because species persisting within isolated habitat fragments may be particularly vulnerable to local environmental change. We have analyzed long-term (14-and 20-y) survey data to assess evidence of fish species declines in two southeastern U.S. rivers where managers and stakeholders have identified potentially detrimental impacts of current and future land uses. The Conasauga River (Georgia and Tennessee) and the Etowah River (Georgia) form free-flowing headwaters of the extensively dammed Coosa River system. These rivers are valued in part because they harbor multiple species of conservation concern, including three federally endangered and two federally threatened fishes. We used data sets comprising annual surveys for fish species at multiple, fixed sites located at river shoals to analyze occupancy dynamics and temporal changes in species richness. Our analyses incorporated repeated site-specific surveys in some years to estimate and account for incomplete species detection, and test for species-specific (rarity, mainstem-restriction) and year-specific (elevated frequencies of low-or high-flow days) covariates on occupancy dynamics. In the Conasauga River, analysis of 26 species at 13 sites showed evidence of temporal declines in colonization rates for nearly all taxa, accompanied by declining species richness. Four taxa (including one federally endangered species) had reduced occupancy across the Conasauga study sites, with three of these taxa apparently absent for at least the last 5 y of the study. In contrast, a similar fauna of 28 taxa at 10 sites in the Etowah River showed no trends in species persistence, colonization, or occupancy. None of the tested covariates showed strong effects on persistence or colonization rates in either river. Previous studies and observations identified contaminants, nutrient loading, or changes in benthic habitat as possible causes for fish species declines in the Conasauga River. Our analysis provides baseline information that could be used to assess effectiveness of future management actions in the Conasauga or Etowah rivers, and illustrates the use of dynamic occupancy models to evaluate evidence of faunal decline from time-series data.

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“…The finding that body size is positively correlated with GEO for cyprinids is consistent with previous research conducted by Taylor and Gotelli (1994), which suggested this relationship is impacted by the maintenance and origin of geographic extents for different species. The positive relationship between body size and GEO for the Percidae family may be because larger bodied percids (especially those with larger habitat breadths) may be more likely to occupy previously uncolonized reaches (Shea, Bettoli, Potoka, Saylor, & Shute, 2015). For the Percidae model, variation in GEO was explained by maximum streamflow and body size, whereas only maximum streamflow predicted variation in GEO for Percina, and maximum and minimum streamflow predicted variation in GEO for Etheostoma.…”

Section: Discussionmentioning

confidence: 94%

“…Likewise, Shea et al (2015) found that extirpation risk increased with high discharge conditions either through the displacement of individuals within a population or disruption of spawning activities. This study determined species' thermal and flow tolerances within a watershed rather than using a controlled laboratory setting.…”

Section: Discussionmentioning

confidence: 99%

Hydrologic and thermal conditions occupied by a species within a single watershed predict the geographic extent of occurrence of freshwater fishes

2019

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Hydrologic regimes and water temperatures are primary predictors of freshwater species occurrence. Although these variables have been demonstrated to be important in regulating species diversity at particular locations, whether species occurrences across lotic habitats within a single, relatively small watershed can predict the full geographic extent of a species is unclear. We use river reach estimates of streamflow and water temperature derived from a watershed-scale hydrologic model, coupled with body size measures, to investigate whether the type and variability of thermal and hydrologic habitat used by fish species within the Mobile River Basin (MRB) can predict the overall geographic extent of occurrence (GEO) for these taxa. Locality data for 108 species of fishes within MRB, one of the most ecologically diverse watersheds in the United States, were intersected with streamflow and water temperature estimates to characterize minimum and maximum streamflow and water temperature conditions and thermal breadth (range of thermal conditions) occupied by each species. Among all species, variation in GEO was associated with variation in thermal breadth and body size. Thermal variables were also important predictors of variation in GEO among Cyprinidae. Flow variables were important predictors of variation in GEO for Centrarchidae, Ictaluridae, and Percidae and within Etheostoma and Percina. Results generally indicate that species with large body size, relatively broad thermal tolerances, or preference for relatively high discharge environments tend to exhibit broader distributions across North America, yet these relationships vary among taxonomic groups.

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Use of Dynamic Occupancy Models to Assess the Response of Darters (Teleostei: Percidae) to Varying Hydrothermal Conditions in a Southeastern United States Tailwater

Cited by 17 publications

References 71 publications

States and rates: Complementary approaches to developing flow‐ecology relationships

States and rates: Complementary approaches to developing flow‐ecology relationships

Long-Term Monitoring Data Provide Evidence of Declining Species Richness in a River Valued for Biodiversity Conservation

Hydrologic and thermal conditions occupied by a species within a single watershed predict the geographic extent of occurrence of freshwater fishes

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