How well do predators adjust to climate-mediated shifts in prey distribution? A study on Australian water pythons

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How well do predators adjust to climate-mediated shifts in prey distribution? A study on Australian water pythons. / Ujvari, Beata; Shine, Richard; Madsen, Thomas.

In: Ecology, Vol. 92, No. 3, 2011, p. 777-783.

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Ujvari, Beata ; Shine, Richard ; Madsen, Thomas. / How well do predators adjust to climate-mediated shifts in prey distribution? A study on Australian water pythons. In: Ecology. 2011 ; Vol. 92, No. 3. pp. 777-783.

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TY - JOUR

T1 - How well do predators adjust to climate-mediated shifts in prey distribution? A study on Australian water pythons

AU - Ujvari, Beata

AU - Shine, Richard

AU - Madsen, Thomas

PY - 2011

Y1 - 2011

N2 - Climate change can move the spatial location of resources critical for population viability, and a species' resilience to such changes will depend upon its ability to flexibly shift its activities away from no-longer-suitable sites to exploit new opportunities. Intuition suggests that vagile predators should be able to track spatial shifts in prey availability, but our data on water pythons (Liasis fuscus) in tropical Australia suggest a less encouraging scenario. These pythons undergo regular long-range (to > 10 km) seasonal migrations to follow flooding-induced migrations by their prey (native dusky rats, Rattus colletti). However, when an extreme flooding event virtually eliminated rats for a three-year period, the local pythons did not disperse despite the presence of abundant rats only 8 km away; instead, many pythons starved to death. This inflexibility suggests that some vagile species that track seasonally migrating prey may do so by responding to habitat attributes that have consistently predicted prey availability over evolutionary time, rather than reacting to proximate cues that signal the presence of prey per se. A species' vulnerability to climate change will be increased by an inability to shift its activities away from historical sites toward newly favorable areas.

AB - Climate change can move the spatial location of resources critical for population viability, and a species' resilience to such changes will depend upon its ability to flexibly shift its activities away from no-longer-suitable sites to exploit new opportunities. Intuition suggests that vagile predators should be able to track spatial shifts in prey availability, but our data on water pythons (Liasis fuscus) in tropical Australia suggest a less encouraging scenario. These pythons undergo regular long-range (to > 10 km) seasonal migrations to follow flooding-induced migrations by their prey (native dusky rats, Rattus colletti). However, when an extreme flooding event virtually eliminated rats for a three-year period, the local pythons did not disperse despite the presence of abundant rats only 8 km away; instead, many pythons starved to death. This inflexibility suggests that some vagile species that track seasonally migrating prey may do so by responding to habitat attributes that have consistently predicted prey availability over evolutionary time, rather than reacting to proximate cues that signal the presence of prey per se. A species' vulnerability to climate change will be increased by an inability to shift its activities away from historical sites toward newly favorable areas.

KW - climate change

KW - dusky rats

KW - extreme climatic events

KW - Liasis fuscus

KW - predator-prey demography

KW - Rattus colletti

KW - spatial heterogeneity

KW - tropical Australia

KW - vagile species

KW - water pythons

U2 - 10.1890/10-1471.1

DO - 10.1890/10-1471.1

M3 - Article

VL - 92

SP - 777

EP - 783

JO - Ecology

JF - Ecology

SN - 0012-9658

IS - 3

ER -