Data from: Bay-scale patterns in the distribution, aggregation and spatial variability of larvae of benthic invertebrates

Daigle RM, Metaxas A, deYoung B

Date Published: April 29, 2014

DOI: http://dx.doi.org/10.5061/dryad.fh505

 

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Title Spatial distribution of Meroplanktonic larvae. A Canadian Healthy Oceans Network Population Connectivity project, PC-06
Downloaded 29 times
Description Larval abundance (count m-3) was sampled at 11 sites on 7-8, and 11-12 Aug 2008 and at 16 sites on Aug 2-4, 2009 (Table 1), with a 200-μm plankton ring net (0.75-m diameter) towed for 5 min at each of 3 m and 12 m depth. These depths were designed to sample: 1) the surface mixed layer and 2) within the pycnocline, at or near the fluorescence maximum. The net was towed at ~1.7 m s-1 and the volume of filtered water was quantified using a General Oceanics flow meter. Using a net of this mesh size may under-estimate abundance of small larvae (< 200 μm). However, it is a necessary compromise in this multi-species study to allow capture of a wide range of larval types at sufficient numbers (e.g. very abundant but small gastropods to larger but rare decapods). All plankton samples were preserved in 95% ethanol and larvae were identified and enumerated under a Nikon SMZ 1500, as described in Lloyd et al. (2012). Samples were split into subsamples using a Folsom plankton splitter. For n = 8, samples were split to 1/64 of the original volume and all subsamples were processed. Based on those samples, we determined that at least 20 individuals of each species were required to obtain an estimate of abundance that was within 5% of the true sample abundance. The remainder of the samples were split to between 1/128 and 1 to ensure that ≥20 individuals of the most abundant species (Margarites spp., Astyris lunata, Mytilus spp., Electra pilosa. and Cancer irroratus) were enumerated. In addition to these 5 species that met the above criteria, we used some less abundant species in some data analyses (see below); however, the validity of the results should not be affected because there was no bias in the estimated abundances and there is often spatial and/or temporal replication.
Download larval abundance.csv (17.90 Kb)
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Title Vemco temperature-depth recorder data. A Canadian Healthy Oceans Network Population Connectivity project, PC-06
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Description No CTD data are available for 2008 because of instrument failure. However, a Vemco Minilog Temperature-Depth Recorder (TDR) was attached to the net during plankton tows on 7-8 Aug 2008 providing some data, and TDR casts to 30 m depth were completed on 11-12 Aug 2008.
Download VEMCO_TDR.csv (608.4 Kb)
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Title Temperature, Salinity, Density and relative fluorescence. A Canadian Healthy Oceans Network Population Connectivity project, PC-06
Downloaded 12 times
Description In 2009, temperature, conductivity, pressure and fluorescence were measured with a conductivity-temperature-density (CTD) profiler immediately before (A) and after (B) larval sampling at each station.
Download CTD.csv (2.144 Mb)
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When using this data, please cite the original publication:

Daigle RM, Metaxas A, deYoung B (2014) Bay-scale patterns in the distribution, aggregation and spatial variability of larvae of benthic invertebrates. Marine Ecology Progress Series 503:139-156. http://dx.doi.org/10.3354/meps10734

Additionally, please cite the Dryad data package:

Daigle RM, Metaxas A, deYoung B (2014) Data from: Bay-scale patterns in the distribution, aggregation and spatial variability of larvae of benthic invertebrates. Dryad Digital Repository. http://dx.doi.org/10.5061/dryad.fh505
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