Ecological vulnerability of two sea turtle species in the Gulf of Mexico: an integrated spatial approach

Changes in ecological attributes as a result of anthropogenic activities and climatic
forces can jeopardize biodiversity, so these potential impacts must be evaluated for conservation.
Integrating the different components of a large ecosystem can, however, pose a methodological
challenge. When evaluating the sensitivity of a system, the level of stress imposed by a threat and
the system’s ability to deal with pressures ultimately define its actual condition. The objective of
this study was to assemble a spatially explicit quantitative approach for evaluating the ecological
vulnerability of 2 sea turtle species (Eretmochelys imbricata and Chelonia mydas). We used a
method that combined the use of an open source planning tool (Conservation Action Planning)
and spatial multicriteria analysis to determine the total cumulative ecological vulnerability to multiple
threats for each species individually and for both species combined. The spatially explicit
outputs were supported by hard data and expert knowledge, including the cumulative ecological
vulnerability of each species to multiple threats. For each species, we identified areas in the Gulf
of Mexico where individual threats have a potential impact and also determined high vulnerability
locations. This spatially explicit approach is important when assessing ecological vulnerability
and risk, it is versatile and easily reproducible for other organisms, and can be an important tool
in supporting the conservation and management of endangered species.