C.J. Reddin
Coastal Upwelling Drives Intertidal Assemblage Structure and Trophic Ecology
Reddin, C.J.; Docmac, F.; O’Connor, N.E.; Bothwell, J.H.; Harrod, C.
Authors
Abstract
Similar environmental driving forces can produce similarity among geographically distant ecosystems. Coastal oceanic upwelling, for example, has been associated with elevated biomass and abundance patterns of certain functional groups, e.g., corticated macroalgae. In the upwelling system of Northern Chile, we examined measures of intertidal macrobenthic composition, structure and trophic ecology across eighteen shores varying in their proximity to two coastal upwelling centres, in a hierarchical sampling design (spatial scales of >1 and >10 km). The influence of coastal upwelling on intertidal communities was confirmed by the stable isotope values (δ13C and δ15N) of consumers, including a dominant suspension feeder, grazers, and their putative resources of POM, epilithic biofilm, and macroalgae. We highlight the utility of muscle δ15N from the suspension feeding mussel, Perumytilus purpuratus, as a proxy for upwelling, supported by satellite data and previous studies. Where possible, we used corrections for broader-scale trends, spatial autocorrelation, ontogenetic dietary shifts and spatial baseline isotopic variation prior to analysis. Our results showed macroalgal assemblage composition, and benthic consumer assemblage structure, varied significantly with the intertidal influence of coastal upwelling, especially contrasting bays and coastal headlands. Coastal topography also separated differences in consumer resource use. This suggested that coastal upwelling, itself driven by coastline topography, influences intertidal communities by advecting nearshore phytoplankton populations offshore and cooling coastal water temperatures. We recommend the isotopic values of benthic organisms, specifically long-lived suspension feeders, as in situ alternatives to offshore measurements of upwelling influence.
Citation
Reddin, C., Docmac, F., O’Connor, N., Bothwell, J., & Harrod, C. (2015). Coastal Upwelling Drives Intertidal Assemblage Structure and Trophic Ecology. PLoS ONE, 10(7), Article e0130789. https://doi.org/10.1371/journal.pone.0130789
Journal Article Type | Article |
---|---|
Acceptance Date | May 26, 2015 |
Online Publication Date | Jul 27, 2015 |
Publication Date | Jul 27, 2015 |
Deposit Date | Mar 7, 2016 |
Publicly Available Date | Mar 29, 2024 |
Journal | PLoS ONE |
Publisher | Public Library of Science |
Peer Reviewed | Peer Reviewed |
Volume | 10 |
Issue | 7 |
Article Number | e0130789 |
DOI | https://doi.org/10.1371/journal.pone.0130789 |
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Copyright Statement
Copyright: © 2015 Reddin et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
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