Marine subsidies change short-term foraging activity and habitat utilization of terrestrial lizards

Ecology and Evolution
Heather V KennyT W Schoener

Abstract

Resource pulses are brief periods of unusually high resource abundance. While population and community responses to resource pulses have been relatively well studied, how individual consumers respond to resource pulses has received less attention. Local consumers are often the first to respond to a resource pulse, and the form and timing of individual responses may influence how the effects of the pulse are transmitted throughout the community. Previous studies in Bahamian food webs have shown that detritivores associated with pulses of seaweed wrack provide an alternative prey source for lizards. When seaweed is abundant, lizards (Anolis sagrei) shift to consuming more marine-derived prey and increase in density, which has important consequences for other components of the food web. We hypothesized that the diet shift requires individuals to alter their habitat use and foraging activity and that such responses may happen very rapidly. In this study, we used recorded video observations to investigate the immediate responses of lizards to an experimental seaweed pulse. We added seaweed to five treatment plots for comparison with five control plots. Immediately after seaweed addition, lizards decreased average perch height and in...Continue Reading

References

May 10, 2000·Trends in Ecology & Evolution·R S Ostfeld, F Keesing
Oct 20, 2000·Proceedings of the National Academy of Sciences of the United States of America·A P BeckermanO J Schmitz
Nov 18, 2006·Science·Jonathan B LososDavid A Spiller
May 8, 2008·Ecology·Louie H YangAmber N Wright
May 28, 2010·Ecology·David A SpillerTomoya Iwata
Jun 17, 2016·Global Change Biology·Oriol LapiedraJason J Kolbe

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Citations

Jul 31, 2018·Annals of the New York Academy of Sciences·David A SpillerJonah Piovia-Scott

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Software Mentioned

R
lme4

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