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Spatial and Temporal Dynamics in Brook Trout Density: Implications for Population Monitoring
- Source :
- North American Journal of Fisheries Management. 34:258-269
- Publication Year :
- 2014
- Publisher :
- Wiley, 2014.
-
Abstract
- Many potential stressors to aquatic environments operate over large spatial scales, prompting the need to assess and monitor both site-specific and regional dynamics of fish populations. We used hierarchical Bayesian models to evaluate the spatial and temporal variability in density and capture probability of age-1 and older Brook Trout Salvelinus fontinalis from three-pass removal data collected at 291 sites over a 37-year time period (1975–2011) in Pennsylvania streams. There was high between-year variability in density, with annual posterior means ranging from 2.1 to 10.2 fish/100 m2; however, there was no significant long-term linear trend. Brook Trout density was positively correlated with elevation and negatively correlated with percent developed land use in the network catchment. Probability of capture did not vary substantially across sites or years but was negatively correlated with mean stream width. Because of the low spatiotemporal variation in capture probability and a strong correlat...
- Subjects :
- geography
education.field_of_study
geography.geographical_feature_category
Ecology
biology
Bayesian probability
Population
Elevation
Drainage basin
STREAMS
Management, Monitoring, Policy and Law
Aquatic Science
biology.organism_classification
Trout
Fontinalis
Environmental science
Physical geography
education
Ecology, Evolution, Behavior and Systematics
Salvelinus
Subjects
Details
- ISSN :
- 15488675 and 02755947
- Volume :
- 34
- Database :
- OpenAIRE
- Journal :
- North American Journal of Fisheries Management
- Accession number :
- edsair.doi...........32852114d051a21b4f80053bcffa2839