DOI: 10.6084/m9.figshare.14852259
title: Data from: Bad neighbors? Niche overlap and asymmetric competition between native and Lessepsian limpets in the Eastern Mediterranean rocky intertidal

description: Data from: Bad neighbors? Niche overlap and asymmetric competition between native and Lessepsian limpets in the Eastern Mediterranean rocky intertidal. Marine Pollution Bulletin 171: https://doi.org/10.1016/j.marpolbul.2021.112703<br>Contains:<br><b>- </b>a key to the unique alpha-numeric species codes used in the datasets described below (species codes_intertidal.csv)<br><b>- </b>replicate-level species composition data (number of individuals collected within 1-m<sup>2 </sup>quadrats)<sup> </sup>for intertidal hard substrate molluscan assemblages on the Israeli Mediterranean shore (data _intertid_community.csv; see Steger et al., Materials and methods, and Supplements 1 and 2 for details on sampling stations, collecting methods, as well as station and replicate sample/quadrat codes)<br><b>- </b>replicate-level composition data as in 'data _intertid_community.csv', but distinguishing between the native (suffix '_nat') and non-indigenous (suffix '_al') components of the sampled molluscan assemblages (data_intertid_native_alien.csv; see Steger et al., Supplement 2 for an explanation of quadrat codes and Supplement 1 for station characteristics and locations)<br><b>- </b>density and dominance of the patelloidean limpets <i>Patella caerulea</i> (native Mediterranean species) and <i>Cellana rota</i> (Indo-Pacific/Lessepsian species) in each replicate 1-m<sup>2</sup> sample (limpet_abundance_data.csv)<br>Explanation of columns:<b>Locality:</b> one of four sampling localities on the Israeli Mediterranean coast (see Steger et al., Materials and methods and Supplement 1)<b>Season:</b> collecting season (either spring or autumn)<b>Station: </b>station code (see Steger et al., Supplement 1)<b>Quadrat:</b> a combination of station code and a sequential replicate number (1 to 3), separated by an underscore<br><b>Latitude:</b> latitude of sampling locality (WGS84)<br><b>Longitude:</b> longitude of sampling locality (WGS84)<b>Abund Cellana rota:</b> density of <i>Cellana rota</i> (individuals per m<sup>2</sup>)<b>Abund Patella caerulea: </b>density of <i>Patella caerulea</i> (individuals per m<sup>2</sup>)<b>Dominance_caerulea: </b>proportion of <i>P. caerulea</i>, relative to the total density of<i> <i>P. caerulea</i></i> and <i><i><i>C. rota</i></i></i><b>season_mean_dom_caerulea: </b>seasonal mean of <i><i>P. caerulea </i></i>dominance (i.e., mean across the three replicates from any one season)<br><b>Dominance_rota:</b> proportion of <i>C. rota</i>, relative to the total density of <i>P. caerulea</i> and <i><i>C. rota</i></i><b>season_mean_dom_rota:</b> seasonal mean of <i><i><i>C. rota</i> </i></i>dominance (i.e., mean across the three replicates from any one season)<br><b>- </b>body size data for individuals of the native Mediterranean limpet <i>Patella caerulea</i> (Patella_size_data.csv) and the Lessepsian limpet <i>Cellana rota</i> (Cellana_size_data.csv)<br>Explanation of columns:<br><b>ID:</b> unique identifier of measured limpet individuals<br><b>Photo ID:</b> photo file number (not available)<b>Sample_code:</b> code for 1-m<sup>2</sup> quadrats (see previously described dataset and Steger et al., Supplements 1 and 2)<b>Code:</b> alpha-numeric species code (G451 = <i>Patella caerulea</i>, G381 = <i>Cellana rota</i>)<br><b>Length: </b>individual length in mm (anterior-posterior dimension)<b>Width:</b> width of individuals in mm (lateral dimension)<b>geo_mean: </b>geometric mean of length and width (in mm)<b>Notes:</b> notes (not available)<b>Station:</b> station code (see previously described dataset, column 'Quadrat', and Steger et al., Supplement 1)<b>Replicate:</b> replicate number for quadrats (3 replicates taken per site and season)<br><b>Fraction:</b> size fraction/sieve mesh size (NA, as intertidal scraping samples were not sieved)<b>abs_abund_Pat</b> and<b> abs_abund_Cell:</b> densities of <i>P. caerulea</i> and <i>C. rota</i> (individuals per m<sup>2</sup>), respectively, in the sample specified in column 'Sample_code'<br><b>prop_abund_Pat</b> and <b>prop_abund_Cell:</b> proportion of <i>P. caerulea</i> and <i>Cellana rota</i>, relative to the total density of these two species<b>Location:</b> one of four sampling localities on the Israeli Mediterranean coast (see Steger et al., Materials and methods and Supplement 1)<br><b>Season:</b> collecting season (either spring or autumn)<b>Locality_Season</b>/<b>Locality_Season_Cellana:</b> combination of locality and season information, introduced for convenience in data analysis (see R-codes at https://doi.org/10.6084/m9.figshare.14852454)<br><b>- </b>fuzzy-coded trait affinity data for each molluscan species encountered in the sampling quadrats (traits_intertidal.csv; see Steger et al., Materials and methods, and Supplement 1 for details on scoring and trait modality definitions)<br>