Title

Data from: Consumer versus resource control and the importance of habitat heterogeneity for estuarine bivalves

Document Type

Data

DOI

10.5061/dryad.4ht86

Publication Date

1-1-2016

Description

The relative influence of consumers (top down) and resources (bottom up) on the distribution and abundance of organisms remains a key question in ecology. We examined the relationships between consumer and resource variables along a productivity gradient for a dominant predator–prey interaction in a marine soft-sediment system. We 1) quantified density and size of the clam Macoma balthica (prey species) in six replicate sites at each of four habitat types (shallow mud, deep mud, muddy sand and detrital mud) in the Rhode River, Chesapeake Bay. We selected one habitat type of high food availability and clam density (shallow mud) and another of low food availability and clam density (muddy sand) for manipulative experiments. Then, we 2) measured M. balthica survival and growth through transplants, 3) measured food availability as sedimentary organic carbon content, 4) quantified predator density, and 5) calculated predator foraging efficiency in the two habitat types. Clam density in the four habitat types differed and was related to sedimentary carbon availability and predator density. One of the habitats, detrital mud, appeared to be a population sink because it only held juvenile Macoma that never survived to reproductive age. Macoma size and growth, and predator (mainly blue crab Callinectes sapidus) densities were positively correlated with productivity and were higher in shallow mud than muddy sand. In contrast, Macoma mortality, local ‘interaction strength’, and predator foraging efficiency were lower in the productive habitat (shallow mud). Thus, predation intensity was inversely correlated with productivity (food availability); consumer and resource effects differed by habitat type; and, at a relatively small spatial scale, consumer and resource forces jointly determined population dynamics in this soft-sediment marine system.,Data spreadsheet for Carbon and nitrogenData spreadsheet for Carbon and nitrogen ANOVA analyses and Fig. 2. Habitat 1 = shallow mud, 2 = muddy sand, 3 = detrital mud, 4 = deep mudCHNData2.xlsxCHNData2 - Statistics for Carbon and NitrogenStatistics for Carbon and Nitrogen ANOVA analyses and Fig. 2.Habitat 1 = shallow mud, 2 = muddy sand, 3 = detrital mud, 4 = deep mudCHNData2.docxAbunVsCHN2 -data spreadsheet for regression equationData spreadsheet for regression equation of CHN vs M. balthica densityAbunVsCHN2.xlsxAbunVsCHN2 -statistics from Minitab CHN vs M. balthica densityStatistics from Minitab for regression equation of CHN vs M. balthica densityAbunVsCHN2.docxAbund&SizeSmLg_05-31-16 -Data spreadsheet Ambient clam densityAmbient M. balthica density and size Small (juvenile) and Large (Adult) and Fig. 3Abund&SizeSmLg_05-31-16.xlsxAbund&SizeSmLg_05-31-16 - Statistics for ambient clam densityANOVAs for M. balthica density and size Small (juvenile) and Large (Adult) and Fig. 3Abund&SizeSmLg_05-31-16.docxPreds2_05-31-16 - Data spreadsheet predator abundanceData for predator abundance ANOVAs, and number of clams per crab ANOVAs and meansPreds2_05-31-16.xlsxPreds2_05-31-16 - Statistics from Minitab for predator abundanceStatistics from Minitab for predator abundance ANOVAs, and number of clams per crab ANOVAs and meansPreds2_05-31-16.docxForagEff -Data spreadsheet Foraging efficiency of crabs on clamsData spreadsheet of foraging efficiency of crabs and clamsForagEff.xlsxForagEff - Statistics in Minitab of foraging efficiency of crabs on clamsStatistics in Minitab of foraging efficiency of crabs on clams, and foraging efficiency ANOVAs (log-transformed data)ForagEff.docxGrowSplitPlot - Data spreadsheet for clam growth using split plot designData spreadsheet for clam growth in caging experiment using split plot designGrowSplitPlot.xlsxGrowSplitPlot -Statistics from Minitab for clam growth from caging experimentsStatistics from Minitab for clam growth from caging experiments; stats for Table 2, growth from split plot analysisGrowSplitPlot.docxOpAmbient2 - Data spreadsheet ambient clams from experimental plotsData spreadsheet ambient clams from experimental plots; mean ambient abundance in experimental plots for Fig. 5OpAmbient2.xlsxOpAmbient2 - Statistics from Minitab mean ambient clam abundanceStatistics from Minitab; mean ambient clam abundance in experimental plots for Fig. 5OpAmbient2.docx,

Publisher

DRYAD

Source Link

http://datadryad.org/stash/dataset/doi:10.5061/dryad.4ht86

Version

1

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