Estimating tag loss of the Atlantic Horseshoe crab, Limulus polyphemus, using a multi-state model

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Abstract

The Atlantic Horseshoe crab, Limulus polyphemus, is a valuable resource along the Mid-Atlantic coast which has, in recent years, experienced new management paradigms due to increased concern about this species role in the environment. While current management actions are underway, many acknowledge the need for improved and updated parameter estimates to reduce the uncertainty within the management models. Specifically, updated and improved estimates of demographic parameters such as adult crab survival in the regional population of interest, Delaware Bay, could greatly enhance these models and improve management decisions. There is however, some concern that difficulties in tag resighting or complete loss of tags could be occurring. As apparent from the assumptions of a Jolly-Seber model, loss of tags can result in a biased estimate and underestimate a survival rate. Given that uncertainty, as a first step towards estimating an unbiased estimate of adult survival, we first took steps to estimate the rate of tag loss. Using data from a double tag mark-resight study conducted in Delaware Bay and Program MARK, we designed a multi-state model to allow for the estimation of mortality of each tag separately and simultaneously.

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Estimating tag loss of the Atlantic Horseshoe crab, Limulus polyphemus, using a multi-state model
Year Published 2012
Language English
Contributing office(s) Coop Res Unit Atlanta
Conference Title 97th ESA Annual Convention
Conference Location Portland
Conference Date August 5-9, 2012
Country United States
State Delaware, New Jersey
Other Geospatial Delaware Bay
Online Only (Y/N) N
Additional Online Files (Y/N) N