The loss of Goshen and Machi, two whimbrel included in The Center for Conservation Biology’s tracking project, to hunters near Port-Louis, Guadeloupe was a watershed event for shorebird scientists. The event forced researchers and government officials to consider the real possibility that hunting within the West Indies and the northern coast of South America may be playing a significant role in observed population declines. The key issue is whether or not current harvest levels within the region are above sustainable limits. CCB has received a grant award from the U.S. Fish and Wildlife Service to estimate sustainable mortality limits for shorebird populations, a first step in understanding this complex relationship and setting harvest limits.
Local hunter in Guadeloupe mangrove swamp with shorebirds. Photo by Anthony Levesque.
Over the past few decades a large portion of the more than 30 shorebird species migrating along the Atlantic Flyway have declined. The underlying cause(s) of these declines are poorly understood. However, the fact that some of these populations breed in different locations, depend on different resources, and have varied winter ranges argues for either a long list of species-specific causes acting in concert or some overarching, broad-based cause. From a cursory survey of biologists within this region in 2010 it was determined that considerable hunting pressure exists at least on Guadeloupe, Martinique, Barbados, Puerto Rico, and Trinidad and Tobago, as well as, other jurisdictions within South America. The collective, annual harvest of passage shorebirds throughout the Caribbean Basin and the northern coast of South America appears to be in range of 200,000. A considerable amount of work is currently needed to quantify harvest pressure and to understand hunting policy for jurisdictions within the flyway. However, even if we had a complete understanding of current harvest rates for all species, we would be in no position to evaluate the population-level consequences of such harvest.
Bag of shorebirds from morning hunt on Guadeloupe. Photo by Anthony Levesque.
The joint CCB-FWS project will estimate sustainable mortality limits that will, for the first time, allow for the assessment of population-level consequences that result from mortality sources whether due to hunting, wind turbines, oil spills or other sources. Such estimates are critically important when evaluating hunting policy or assessing mortality from other sources on a flyway scale.
Written by
Bryan Watts | bdwatt@wm.edu | (757) 221-2247
June 13, 2013
A bald eagle nest just off the Poropotank River in Virginia in 2003. A nest with two equal young and ample food was a normal scene during this time period. This reflects a golden period during the late 1990s and early 2000s when males had more leisure time to hunt and provide for broods. Photo by Catherine Markham.
Breeding female on the Eltham Bridge. This female was hatched on Elkins Marsh along the seaside of the Delmarva in 2010 and has held the territory on the Eltham Bridge since 2013 with three successive males. She has been very aggressive and protective of the nest site and has held the territory together. She was found with a wing injury from a collision in December and could not be rehabilitated. She is one of a number of falcons that have been documented to go down in 2022. Photo by Bryan Watts.