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Memory of.conspecif.cs in male salamanders Plethodon cinereus： Implications f.r territorial def.nse

Current Zoology 2013年第3期59卷 326-334页

作者： Nancy R. KOHN Jennif.r M. DEITLOf. schuyler f. dartez Michelle M.WILCOX Robert G. JAEGER Department of.Biology University of Louisiana at Lafayette Lafayette LA 70504 USA Department of.Ecology Evolution and Organismal Biology Iowa State University Ames IA 50011 USA 110 Insectary Pammel Drive Iowa State University Ames IA 50011 USA. The Louisiana Department of.ildlif. and f.sheries White Lake Wetlands Conservation Area Gueydan LA 70542 USA. 100 Simon Latour Road Carencro LA 70520 USA

We investigated how exposure duration （time that two individuals initially interact） and separation interval （time be- tween the initial interaction and a subsequent interaction） af.ect recognition memory of.conspecif.cs in male red-backed sala- manders Plethodon cinereus. Previous studies have demonstrated that this species aggressively def.nds territories. We recorded aggressive behavior to assess recognition memory, because aggression is more intense toward previously unencountered indi- viduals compared to previously encountered individuals in this species. We f.und that with 15-min exposures and 5-day separa- tion intervals, f.cal males did not spend signif.cantly more time threatening ＇unf.miliar＇ intruders than ＇f.miliar＇ intruders. Af.er either 8-hour exposures and 5-day separation intervals and 5-day exposures and 5-day separation intervals, f.cal males spent sig- nif.cantly more time threatening unf.miliar intruders than f.miliar intruders. These results suggest that male red-backed salaman- ders can remember f.miliar conspecif.cs （e.g., territorial neighbors） af.er at least an 8-hour exposure duration and that memory persists at least as long as 5 days. Af.er 5-day exposure and 15-day separation intervals, we f.und no signif.cant dif.erence in ag- gressive behavior toward f.miliar and unf.miliar intruders. Long separation intervals （15 days） may lead either to loss of.memory of.previously f.miliar individuals or, alternatively, aggressive reassessment of.individuals as only a change in behavior indicates positively that memory has occurred. Thus, variance in territorial def.nse within an individual may depend on its ability to recog- nize conspecif.c males .

关键词： Individual recognition Memory Plethodon cinereus Red-backed salamanders Territoriality

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