STAGE-SPECIFIC AND INTERACTIVE EFFECTS OF SEDIMENTATION AND TROUT ON A HEADWATER STREAM SALAMANDER

摘要: In species with complex life cycles, stage-specific effects of environmental conditions combine factors regulating recruitment to determine popu- lation-level response habitat disturbance. The abundance the stream salamander Gyr- inophilus porphyriticus (Plethodontidae) is negatively related both logging-associated sedimentation and brook trout (Salvelinus fontinalis) in headwater streams throughout New Hampshire, USA. To understand mechanisms underlying these patterns, we investigated interactive on G. porphyriticus. We conducted quantitative surveys salamanders, trout, substrate embeddedness 15 first-order used a controlled experiment test direct larval growth survival. larvae adults had opposite patterns sediment trout. Multiple regression analysis our survey data indicated that was abundance, but unrelated embeddedness. contrast, primarily Consistent field pattern negative effect survival experiment. However, there no interaction between sediment. Larval adult abundances were not significantly correlated study streams, indicative independent populations. These results suggest resistance fish may facilitate coexistence can buffer populations from extinction fishless impacted by logging. where are low, reductions caused logging impacts pose risk persistence. Our findings underscore value information history, demography, community ecology as- sessing sensitivity anthropogenic perturbation.