74 Sandlance

Description: Sandlance survey data from Stellwagen Bank National Marine Sanctuary

Found In: 2022 Indicator Catalog

Indicator category: Published methods

Contributor(s): David N. Wiley, Tammy L. Silva

Data steward: Moe Nelson

Point of contact: Moe Nelson

Public availability statement:Source data are publicly available.

74.1 Methods

74.1.1 Data Sources

This data set is taken directly from Table 1, Silva et al. (2020). See full citation in “References” section below.

74.1.2 Data Analysis

Data processing and analysis methods are described in Silva et al. (2020). The catch counts of sand lance and observational counts of humpback whales and great shearwater were used to derive spatial metrics (center of gravity, and inertia) for each species. Equations for these spatial metrics are provided in Table 2 of Silva et al. (2020). The spatial metrics (center of gravity, inertia) were used to calculate the global index of collocation (GIC) to quantify spatial overlap between pairs of species for each cruise. GICs for species pairs are reported in Table 3 of Silva et al. (2020), but data were not sufficient to calculate GICs for each pair of species in each cruise.

74.1.3 Data Processing

Code for processing salinity data can be found here.

catalog link No associated catalog page

References

Silva, Tammy L., David N. Wiley, Michael A. Thompson, Peter Hong, Les Kaufman, Justin J. Suca, Joel K. Llopiz, Hannes Baumann, and Gavin Fay. 2020. “High Collocation of Sand Lance and Protected Top Predators: Implications for Conservation and Management.” Conservation Science and Practice 3 (2). https://doi.org/10.1111/csp2.274.