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Balancing the Edge Effects Budget: Bay Scallop Settlement and Loss Along a Seagrass Edge
Ecology (2012)
  • John M. Carroll, Georgia Southern University
  • Bradley T. Furman, Stony Brook University
  • Stephen T. Tettelbach, Long Island University
  • Bradley J. Peterson, Stony Brook University
Abstract
Edge effects are a dominant subject in landscape ecology literature, yet they are highly variable and poorly understood. Often, the literature suggests simple models for edge effects—positive (enhancement at the edge), negative (enhancement at the interior), or no effect (neutral)—on a variety of metrics, including abundance, diversity, and mortality. In the marine realm, much of this work has focused on fragmented seagrass habitats due to their importance for a variety of commercially important species. In this study, the settlement, recruitment, and survival of bay scallops was investigated across a variety of seagrass patch treatments. By simultaneously collecting settlers (those viable larvae available to settle and metamorphose) and recruits (those settlers that survive some period of time, in this case, 6 weeks) on the same collectors, we were able to demonstrate a “balance” between positive and negative edge effects, resulting in a net neutral effect. Scallop settlement was significantly enhanced along seagrass edges, regardless of patch type while survival was elevated within patch interiors. However, recruitment (the net result of settlement and post‐settlement loss) did not vary significantly from edge to center, representing a neutral effect. Further, results suggest that post‐settlement loss, most likely due to predation, appears to be the dominant mechanism structuring scallop abundance, not patterns in settlement. These data illustrate the complexity of edge effects, and suggest that the metric used to investigate the effect (be it abundance, survival, or other metrics) can often influence the magnitude and direction of the perceived effect. Traditionally, high predation along a habitat edge would have indicated an “ecological trap” for the species in question; however, this study demonstrates that, at the population level, an ecological trap may not exist.
Keywords
  • Edge effects budget,
  • Bay Scallop settlement,
  • Seagrass edge
Disciplines
Publication Date
July, 2012
DOI
10.1890/11-1904.1
Publisher Statement
© 2012 by the Ecological Society of America. The Author(s) shall retain the right to quote from, reprint, translate and reproduce the work, in part or in full, in any book or article he/she may later write, or in any public presentation. The Author may post the work in a publicly accessible form on his/her personal or home institution's webpages. If the Author(s) reproduces a portion of the work in a book, article or other media, the legend or caption of any table or figure that represents data from the work, in original or modified form, shall cite the work as the source of those data. In addition, the Author(s) shall have the right to photocopy the work for his/her own use or public distribution. If the Author(s) reprints, translates or photocopies the work, the original copyright notice, as it appears in the journal, must be included. The Author retains all proprietary rights other than copyright, such as patent rights.

This article was retrieved from Ecology.
Citation Information
John M. Carroll, Bradley T. Furman, Stephen T. Tettelbach and Bradley J. Peterson. "Balancing the Edge Effects Budget: Bay Scallop Settlement and Loss Along a Seagrass Edge" Ecology Vol. 93 Iss. 7 (2012) p. 1637 - 1647 ISSN: 1939-9170
Available at: http://works.bepress.com/john-m-carroll/24/