The effects of intraguild interactions (or lack of) on prey diversity in experimental ponds food webs

Stemp, Kenzi M.; Anderson, Thomas L.; Davenport, Jon M.

doi:10.1016/j.fooweb.2021.e00207

Food Webs

2021

DOI: 10.1016/j.fooweb.2021.e00207

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The effects of intraguild interactions (or lack of) on prey diversity in experimental ponds food webs

Kenzi M. Stemp

Thomas L. Anderson

Jon M. Davenport

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2024

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Cited by 2 publications

References 68 publications

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Trophic effects of Bti-based mosquito control on two top predators in floodplain pond mesocosms

Gerstle,

Bollinger,

Manfrin

et al. 2024

Environ Sci Pollut Res

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Chironomid (Diptera: Chironomidae) larvae play a key role in aquatic food webs as prey for predators like amphibian and dragonfly larvae. This trophic link may be disrupted by anthropogenic stressors such as Bacillus thuringiensis var. israelensis (Bti), a biocide widely used in mosquito control. In a companion study, we recorded a 41% reduction of non-target larval chironomids abundance in outdoor floodplain pond mesocosms (FPMs) treated with Bti. Therefore, we examined the diet of two top predators in the FPMs, larvae of the palmate newt (Salamandridae: Lissotriton helveticus) and dragonfly (Aeshnidae: predominantly Anax imperator), using bulk stable isotope analyses of carbon and nitrogen. Additionally, we determined neutral lipid fatty acids in newt larvae to assess diet-related effects on their physiological condition. We did not find any effects of Bti on the diet proportions of newt larvae and no significant effects on the fatty acid content. We observed a trend in Aeshnidae larvae from Bti-FPMs consuming a higher proportion of large prey (Aeshnidae, newt, damselfly larvae; ~42%), and similar parts of smaller prey (chironomid, mayfly, Libellulidae, and zooplankton), compared to controls. Our findings may suggest bottom-up effects of Bti on aquatic predators but should be further evaluated, for instance, by using compound-specific stable isotope analyses of fatty acids or metabarcoding approaches.

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Trophic effects of Bti-based mosquito control on two top predators in floodplain pond mesocosms

Gerstle,

Bollinger,

Manfrin

et al. 2024

Environ Sci Pollut Res

View full text Add to dashboard Cite

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Variability in intermediate predator hatching does not alter top-down effects of top predators

Davenport,

Burton,

Suchniak

et al. 2024

Can. J. Zool.

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Variability in phenological shifts (seasonal changes in biological events) has become more common with climate change. As phenological variability increases due to climatic factors, species interactions within diverse communities can be affected. Shifts in hatching phenology can lead to body size variability that can alter species interactions, especially within and across trophic levels in complex food webs. To understand the effects of hatching phenology and food web complexity on prey communities, we conducted an experiment with ectotherms from ponds by manipulating hatching synchrony of a prey species across three dates and food web complexity. We hypothesized that predation on prey would be highest in the lowest synchrony treatment due to predator satiation effects in high synchrony additions. Food webs with top predators present had the lowest survival rates for prey compared to other food webs. Prey size at metamorphosis was also highest in the top predator food webs, suggesting a thinning effect. Hatching synchrony treatments did not have a significant impact on prey survival or size at metamorphosis except in treatments where intermediate and top predators were absent. Overall, our results show that top-down effects of predators may be enough to suppress the influence of phenological shifts in prey.

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The effects of intraguild interactions (or lack of) on prey diversity in experimental ponds food webs

Cited by 2 publications

References 68 publications

Trophic effects of Bti-based mosquito control on two top predators in floodplain pond mesocosms

Trophic effects of Bti-based mosquito control on two top predators in floodplain pond mesocosms

Variability in intermediate predator hatching does not alter top-down effects of top predators

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