Data from: Detrital shadows: estuarine food web connectivity depends on fluvial influence and consumer feeding mode
Howe, Emily, University of Washington
Simenstad, Charles A., University of Washington
Ogston, Andrea, University of Washington
Published Jun 13, 2017 on Dryad.
Cite this dataset
Howe, Emily; Simenstad, Charles A.; Ogston, Andrea (2017). Data from: Detrital shadows: estuarine food web connectivity depends on fluvial influence and consumer feeding mode [Dataset]. Dryad. https://doi.org/10.5061/dryad.2r23r
We measured the influence of landscape setting on estuarine food web connectivity in five macrotidal Pacific Northwest estuaries across a gradient of freshwater influence. We used stable isotopes (δ13C, δ15N, δ34S) in combination with a Bayesian mixing model to trace primary producer contributions to suspension- and deposit-feeding bivalve consumers (Mytilus trossulus and Macoma nasuta) transplanted into three estuarine vegetation zones: emergent marsh, mudflat, Japanese eelgrass (Zostera japonica), and native eelgrass (Zostera marina). Fluvial discharge and consumer feeding mode strongly influenced the strength and spatial scale of observed food web linkages, while season played a secondary role. Mussels displayed strong cross-ecosystem connectivity in all estuaries, with decreasing marine influence in the more fluvial estuaries. Mussel diets indicated homogenization of detrital sources within the water column of each estuary. In contrast, the diets of benthic deposit-feeding clams indicated stronger compartmentalization in food web connectivity, especially in the largest river delta where clam diets were trophically disconnected from marsh sources of detritus. This suggests detritus deposition is patchy across space, and less homogenous than the suspended detritus pool. In addition to fluvial setting, other estuary-specific environmental drivers, such as marsh area or particle transport speed, influenced the degree of food web linkages across space and time, often accounting for unexpected patterns in food web connectivity. Transformations of the estuarine landscape that alter river hydrology or availability of detritus sources can thus potentially disrupt natural food web connectivity at the landscape scale, especially for sedentary organisms which cannot track their food sources through space.
Puget Sound nearshore isotope database
This csv file contains individual stable isotope records for primary producers and estuarine consumer organisms collected between 2006 and 2012 in Puget Sound, Washington, USA. Stable isotopes of d13C, d15N, and d34 S are available, as well as C, N, and S content and CN ratio. The following species are included, documented by day, month, year, high/low fluvial discharge period, estuary, location within an estuary, species, and tissue: Acer circinatum, Alnus rubra, Atriplex patula, Battelaria attrementaria, Caprella laeviscula, Carex lyngbyei, Ceramium sp., Cladophora sp., Clinocardium nuttalii, Cotula coronopifolia, Crangon franciscorum, Deschampsia caespitosa, Diatoms (benthic), Distichlis spicata, Enteromorpha sp., Fucus distichus, Glaux maritima, Grindelia stricta, Juncus balthica, Lonicera involucrata, Macoma nasuta, Mya arenaria, Myrica gale, Mytilus sp. (edulis or galloprovincialis or hybrid), Parophrys vetulus, Phytoplankton, Potentilla pacifica, Protothaca staminea, Salicornia virginica, Salix spp., Scirpus acutus, Scirpus americanus, Scirpus maritimus, Scirpus validus, Sygnathus griseolineatus, Triglochin maritima, Typha, Ulva fenestrata, Venerupis phillipinarum, Zostera japonica, Zostera marina,