Risky prey behavior evolves in risky habitats

Proceedings of the National Academy of Sciences of the United States of America - Tập 104 Số 36 - Trang 14377-14382 - 2007
Mark C. Urban1
1School of Forestry and Environmental Studies, Yale University, 370 Prospect Street, New Haven, CT 06511, USA

Tóm tắt

Longstanding theory in behavioral ecology predicts that prey should evolve decreased foraging rates under high predation threat. However, an alternative perspective suggests that growth into a size refuge from gape-limited predation and the future benefits of large size can outweigh the initial survival costs of intense foraging. Here, I evaluate the relative contributions of selection from a gape-limited predator ( Ambystoma opacum ) and spatial location to explanations of variation in foraging, growth, and survival in 10 populations of salamander larvae ( Ambystoma maculatum ). Salamander larvae from populations naturally exposed to intense A. opacum predation risk foraged more actively under common garden conditions. Higher foraging rates were associated with low survival in populations exposed to free-ranging A. opacum larvae. Results demonstrate that risky foraging activity can evolve in high predation-risk habitats when the dominant predators are gape-limited. This finding invites the further exploration of diverse patterns of prey foraging behavior that depends on natural variation in predator size-selectivity. In particular, prey should adopt riskier behaviors under predation threat than expected under existing risk allocation models if foraging effort directly reduces the duration of risk by growth into a size refuge. Moreover, evidence from this study suggests that foraging has evolved over microgeographic scales despite substantial modification by regional gene flow. This interaction between local selection and spatial location suggests a joint role for adaptation and maladaptation in shaping species interactions across natural landscapes, which is a finding with implications for dynamics at the population, community, and metacommunity levels.

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Tài liệu tham khảo

10.2307/1938642

10.1016/S0065-3454(08)60366-6

10.1086/382755

10.1146/annurev.ecolsys.35.021004.112426

10.1111/j.1558-5646.1996.tb02346.x

10.1086/303202

10.1111/j.1558-5646.1998.tb01654.x

10.1139/z90-092

10.1007/BF00292500

10.1111/j.1420-9101.2004.00822.x

JD Arendt, DS Wilson Evolution (Lawrence, Kans) 51, 1946–1954 (1997).

K Spitze Evolution (Lawrence, Kans) 45, 82–92 (1991).

10.1577/1548-8659(1991)120<0500:EAOPSB>2.3.CO;2

10.1086/283042

10.2307/1941053

10.1111/j.0014-3820.2002.tb01401.x

10.1086/410622

10.1086/284455

10.1038/346357a0

10.1111/j.0014-3820.2001.tb00836.x

10.1111/j.1558-5646.1999.tb05383.x

SC Stearns Evolution (Lawrence, Kans) 37, 601–617 (1983).

10.1111/j.0014-3820.2004.tb01606.x

10.1111/j.0014-3820.2003.tb00292.x

10.1006/tpbi.1998.1405

10.1890/0012-9658(2006)87[1616:EMTAEP]2.0.CO;2

10.1086/286194

MC Urban (Yale Univ New Haven CT PhD dissertation. (2006).

MC Urban Ecology, in press. (2007).

10.7208/chicago/9780226118697.001.0001

D Reznick, MJ Butler, FH Rodd, P Ross Evolution (Lawrence, Kans) 50, 1651–1660 (1996).

10.1016/S0169-5347(00)88956-9

10.1007/BF01239386

10.1093/icb/45.3.456

RD Holt Species Diversity in Ecological Communities: Historical and Geographical Perspectives, eds RE Ricklefs, D Schluter (Univ Chicago Press, Chicago), pp. 77–88 (1993).

10.1098/rspb.2004.2751

10.1086/505159

10.1023/A:1011042721274

10.1073/pnas.2235465100

10.1111/j.1461-0248.2004.00608.x

10.1111/j.0014-3820.2004.tb01577.x

10.1111/j.1558-5646.1991.tb02671.x

10.2307/1563822

JW Petranka Salamanders of the United States and Canada (Smithsonian Institution, Washington, DC, 1998).

JH Zar Biostatistical Analysis (Prentice Hall, Upper Saddle River, NJ, 1999).

10.1111/j.0014-3820.2004.tb01582.x

MJ Crawley Statistical Computing: An Introduction to Data Analysis Using S-Plus (Wiley, New York, 2002).

M Lynch, B Walsh Genetics and Analysis of Quantitative Traits (Sinauer, Sunderland, MA, 1998).

P Legendre, L Legendre Numerical Ecology (Elsevier, New York, 1998).

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Proceedings of the National Academy of Sciences of the United States of America

Tập 104 Số 36

14377-14382

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