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Reciprocal transplant reveals trade-off of resource quality and predation risk in the field

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Abstract

Balancing trade-offs between avoiding predators and acquiring food enables animals to maximize fitness. Quantifying their relative contribution to vital rates in nature is challenging because predator abundance and nutrient enrichment are often confounded. We employed a reciprocal transplant study design to separate these confounded effects on growth and reproduction of snails at wetland sites along a gradient of predator threats and phosphorus (P) enrichment associated with a canal. We held snails in mesh bags that allowed the passage of waterborne predator cues and fed them local or transplanted periphyton. Molluscivores were more abundant near the canal, and snails tethered near the canal suffered 33 % greater mortality than those tethered far from it (far sites). The greatest difference in snail growth rates was at the far sites where growth on far periphyton was 48 % slower than on P-enriched (near canal) periphyton. Close proximity to the canal reduced growth on near periphyton by 21 % compared to growth on the same periphyton far from the canal; there was no difference in growth rate on either periphyton type when snails were raised near the canal. Snails laid 81 % more egg masses at far sites than at near sites, regardless of periphyton origin. Top–down and bottom–up processes were elevated near the canal, and their effects canceled on growth, but not reproduction. Phenotypic trade-offs such as these may explain why some taxa show little response to nutrient enrichment, compared to others, or that the effects of nutrient enrichment may be context dependent.

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Acknowledgments

We thank J. Dummit, L. Harrison, L. Jiang, R. Lomax, A. Obaza, A. Parker, A. Taylor, and A. Williams, F. Tobias and P. Parker for field and lab assistance. The Everglades Foundation and the FIU graduate school provided financial support to CBR. Tom Fink at East Carolina University kindly provided access to a microscope for soft algae counts. Field data were provided by ENP-FIU Cooperative Agreement H5000060104, Task numbers J5284060023 and J5297070024 to JCT. This material was developed with help from the FCE-LTER program under NSF Grant No. DBI-0620409 and is contribution number 721 from the Southeast Environmental Research Center at FIU.

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  1. Clifton B. Ruehl

    Present address: Department of Biology, Columbus State University, Columbus, GA, 31907, USA

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  1. Department of Biological Sciences, Florida International University, 3000 NE 151st Street, North Miami, FL, USA

    Clifton B. Ruehl & Joel C. Trexler

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  1. Clifton B. Ruehl
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Correspondence to Clifton B. Ruehl.

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Communicated by Roland A. Brandl.

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Ruehl, C.B., Trexler, J.C. Reciprocal transplant reveals trade-off of resource quality and predation risk in the field. Oecologia 179, 117–127 (2015). https://doi.org/10.1007/s00442-015-3324-4

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