Quantifying Species Abundance Trends in the Northern Gulf of California Using Local Ecological Knowledge
Open Access
- 1 January 2011
- journal article
- Published by Wiley in Marine and Coastal Fisheries
- Vol. 3 (1), 190-218
- https://doi.org/10.1080/19425120.2010.549047
Abstract
Ecosystem‐based fisheries management requires data on all parts of the ecosystem, and this can be a barrier in data‐poor systems. Marine ecologists need a means of drawing together diverse information to reconstruct species abundance trends for a variety of purposes. This article uses a fuzzy logic approach to integrate information from multiple data sources and describe biomass trends for marine species groups in the northern Gulf of California, Mexico. Forty‐two species groups were analyzed, comprising fish, invertebrates, birds, mammals, turtles, and algae. The most important new data series comes from recent interviews with fishers in the northern part of the gulf. Respondents were asked to classify the abundance of various targeted and untargeted marine species groups from 1950 to the present. The fuzzy logic method integrates their responses with catch‐per‐unit‐effort series, intrinsic vulnerability to fishing determined from life history parameters, biomass predicted by a Schaefer harvest model, and other simple indices. The output of the fuzzy logic routine is a time series of abundance for each species group that can be compared with known trends. The results suggest a general decline in species abundance across fished and unfished taxa, with a few exceptions. Information gathered from interviews indicated that older fishers tended to recognize a greater relative decrease in species abundance since 1970 than did younger fishers, providing another example of Pauly's (1995) shifting cognitive baselines.Keywords
This publication has 35 references indexed in Scilit:
- Evaluation of Local Ecological Knowledge as a Method for Collecting Extensive Data on Animal AbundanceConservation Biology, 2009
- Shifting environmental and cognitive baselines in the upper Gulf of CaliforniaFrontiers in Ecology and the Environment, 2008
- Saving the Vaquita: Immediate Action, Not More DataConservation Biology, 2007
- Reinterpreting the State of Fisheries and their ManagementEcosystems, 2007
- Possible causes related to historic stock depletion of the totoaba, Totoaba macdonaldi (Perciformes: Sciaenidae), endemic to the Gulf of CaliforniaFisheries Research, 2007
- An analysis of critical areas for biodiversity conservation in the Gulf of California RegionOcean & Coastal Management, 2005
- Shifting baselines and the decline of pelagic sharks in the Gulf of MexicoEcology Letters, 2004
- Effects of Upstream Diversion of Colorado River Water on the Estuarine Bivalve Mollusc Mulinia coloradoensisConservation Biology, 2001
- The effects of fishing on sharks, rays, and chimaeras (chondrichthyans), and the implications for marine ecosystemsICES Journal of Marine Science, 2000
- Protection of Marine Fish Stocks at Risk of ExtinctionFisheries, 2000