Demographic Models: life tables, matrix models and rebound potential

Simpfendorfer, Colin A.

Abstract

Information on the status of shark populations and how they respond to increases in mortality (e.g. from fishing, predation, disease), is critical to making management decisions about fished or endangered species. It is no surprise then that a considerable part of the fish and fisheries literature is devoted to this type of research. In the ideal situation long-term series of information about a population - catches, fishing effort, change in abundance -exist. In this situation dynamic fishery models can be applied to derive extensive management related information. However, in many situations the data required to support these types of management models do not exist. This is often the case with shark populations, where the collection of these data has been uneconomical or overlooked. In this situation population models that rely primarily on life history parameters can provide some useful information for management. Such models are normally referred to as demographic models. These demographic analyses became popular for shark stocks in the 1990s and are the most widely used form of population model for this group of fishes (Hoenig and Gruber, 1990; Cailliet, 1992; Cortes, 1995, 1998, 1999, 2002; Cortes and Parsons, 1996; Smith, Au and Show, 1998; Simpfendorfer, 1999a,b; Brewster-Geisz and Miller, 2000; Mollet and Cailliet, 2002).

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Management Techniques for Elasmobranch Fisheries

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978-92-5-105403-1

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474

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Food and Agriculture Organization of the United Nations

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Rome, Italy

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