Effects of organic matter availability on the life history and production of a top vertebrate predator (Plethodontidae: Gyrinophilus palleucus) in two cave streams

• DOI: 10.1111/j.1365-2427.2011.02609.x
• Publication Date: 2011-04-26T01:33:31Z
• Authors: BROCK M. HUNTSMAN; MICHAEL P. VENARSKY; JONATHAN P. BENSTEAD; ALEXANDER D. HURYN
• Keywords: 0106 biological sciences; 15. Life on land; 01 natural sciences

1. Surface ecosystems provide the primary source of organic matter to many cave communities. Variation in strength connectivity surface suggests that some caves may be more resource-limited than others. To test this, we examined diet, prey availability and production an obligate salamander Gyrinophilus palleucus (Plethodontidae), a top predator, two south-eastern U.S.A. with different levels (Tony Sinks cave, 165 g AFDM m−2; Bluff River 62 m−2). 2. We quantified density, biomass, growth rate, diet G. monthly for 21 months. Diet composition, differences communities seasonal patterns consumption were also analysed. 3. Salamander biomass secondary significantly greater high (0.10 m−2, 0.18 0.12 m−2 year−1) low (0.03 0.03 0.01 year−1). Although rates not statistically between populations, recaptures probably influenced this result. 4. Isopoda major contributor (69%). In was provided by isopods (41%) oligochaetes (20%). The lower number taxa contributing ability forage selectively. 5. foraging strategy, related connectivity, which controls supply. Links basal resource level predator performance show importance bottom-up limitation food webs other detritus-based ecosystems.