Uncoupling of omnivore-mediated positive and negative effects on periphyton mats

Abstract

The riverine grass shrimp (Palaemonetes paludosus) and eastern mosquitofish (Gambusia holbrooki) consume periphyton and small invertebrates, potentially affecting periphyton through negative effects (i.e., consumption) and/or positive effects such as nutrient regeneration, physical stimulation, and trophic cascades. We performed field experiments in the Everglades in which omnivores and periphyton were maintained in cages, with a fraction of the periphyton held in omnivore-exclusion bags that allowed passage of nutrients but prevented its consumption or physical disturbance. In some instances, periphyton growth rate increased with increasing omnivore biomass. Omnivores probably stimulated periphyton growth through nutrient regeneration, possibly subsidizing periphyton with nutrients derived from ingested animal prey. The net balance of omnivore-mediated negative and positive effects varied among experiments because of seasonal and spatial differences in periphyton characteristics. Consumption of periphyton mats might have been reduced by the arrangement of palatable algae (green algae and diatoms) within a matrix of unpalatable ones (CaCO3-encrusting filamentous cyanobacteria). In a laboratory feeding experiment, mosquitofish consumed more green algae and diatoms in treatments with disrupted mat structure than in those with intact mats. No difference in diet was observed for shrimp. Our study underscores the complexity of consumer-periphyton interactions in which periphyton edibility affects herbivory and consumers influence periphyton through multiple routes that cannot be fully appreciated in experiments that only investigate net effects.

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Acknowledgements

We thank Ron Jones and the Southeastern Environmental Research Center (SERC) for processing nutrient samples, and Sue Perry for assistance and support. Thanks to the 23 people who helped with fieldwork, making this project possible. We thank J.H. Chick who provided help with several conceptual areas of this project. We also greatly appreciate the comments of C. Osenberg, which improved this manuscript considerably. This work was funded by cooperative agreement number CA5280-8-9002 between Everglades National Park and Florida International University, and a fellowship to P. Geddes from the FIU Tropical Biology Program. This is SERC contribution 199 and 61 of the FIU Tropical Biology Program.

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Correspondence to Pamela Geddes.

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Geddes, P., Trexler, J.C. Uncoupling of omnivore-mediated positive and negative effects on periphyton mats. Oecologia 136, 585–595 (2003). https://doi.org/10.1007/s00442-003-1294-4

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Keywords

  • Florida Everglades
  • Grazing
  • Omnivory
  • Periphyton
  • Positive and negative effects