Abstract:
:Previous work suggests that animal water balance can influence trophic interactions, with predators increasing their consumption of water-laden prey to meet water demands. But it is unclear how the need for water interacts with the need for energy to drive trophic interactions under shifting conditions. Using manipulative field experiments, we show that water balance influences the effects of top predators on prey with contrasting ratios of water and energy, altering the frequency of intraguild predation. Water-stressed top predators (large spiders) negatively affect water-laden basal prey (crickets), especially male prey with higher water content, whereas alleviation of water limitation causes top predators to switch to negatively affecting energy-rich midlevel predators (small spiders). Thus, the relative water and energy content of multiple prey, combined with the water demand of the top predator, influences trophic interactions in ways that can alter the strength of intraguild predation. These findings underscore the need for integration of multiresource approaches for understanding implications of global change for food webs.
journal_name
Ecologyjournal_title
Ecologyauthors
Leinbach IL,McCluney KE,Sabo JLdoi
10.1002/ecy.2635subject
Has Abstractpub_date
2019-04-01 00:00:00pages
e02635issue
4eissn
0012-9658issn
1939-9170journal_volume
100pub_type
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