Dataset: Mark Recapture
Deployment: Grosholz

We conducted monthly trapping of invasive European green crabs to gather demographic data in Seadrift Lagoon, Stinson Beach, CA (lat 37.907440, long -122.6661694). All sites were accessed by either kayak or by foot via shore entry. At each of the six sites used for monthly trapping plus three additional sites, we placed 15 baited traps (folding Fukui fish traps) in shallow (<2 m) subtidal areas. Traps were retrieved 24 hours later and were rebaited and collected again the following day. Trapping was continued for four consecutive days with traps removed on the final day. Crabs were marked by clipping two adjacent anterio-lateral spines. Each day, data for crab species, size, sex, reproductive condition, injuries, and presence of marks were collected for all crabs in the field. Following data collection, all marked crabs were returned to the lagoon at the same site that the crabs were collected.

See Turner et al. (2016) for additional methodological details.