By Eugene H Kaplan
Portrays the ecology and formation of coral reefs and describes many of the animals that inhabit the reefs of southern Florida and the Caribbean
Read or Download A field guide to coral reefs of the Caribbean and Florida : a guide to the common invertebrates and fishes of Bermuda, the Bahamas, southern Florida, the West Indies, and the Caribbean coast of Central and South America PDF
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Additional resources for A field guide to coral reefs of the Caribbean and Florida : a guide to the common invertebrates and fishes of Bermuda, the Bahamas, southern Florida, the West Indies, and the Caribbean coast of Central and South America
For a description of the array of behavioral and ecological mechanisms that can lead to this effect, see Stephens et al. (1999). Among the mechanisms of direct interest in this chapter are effects related to fluctuations in the sex ratio at low population sizes (Stephens et al. 1999) which affect fertilization success. 7(a)). 7 Models allowing for depensatory effects based on generalizations of (a) Beverton–Holt-type and (b) Ricker-type models relating recruitment and egg production. 7(b)). Attempts to discern widespread evidence for depensatory dynamics in exploited fish populations have so far provided relatively few direct examples (Myers et al.
9). Relatively small differences in the slope of the recruitment curve at the origin can have important implications for inferences concerning the resilience of a population to high levels of exploitation. Later in this chapter, we will explore how these considerations shape our view of the resilience of a population to harvesting and the ways in which a refined understanding of the reproductive output of a population can help in setting appropriate management objectives. 3 Completing the life cycle The previous sections dealt strictly with processes during the pre-recruit phase, operating on the initial number of viable eggs produced by the population.
Under the more moderate maternal effect on lifetime egg production (labeled F(m1)), we still predict a stable equilibrium point. In effect, for this hypothetical case the steeper slope of the recruitment curve at the origin for the ‘actual’ case is sufficient to offset the lower level of lifetime egg production at this level of fishing mortality when maternal effects are in fact important. However, with the second case representing a stronger maternal effect on lifetime viable egg production, we no longer have an intersection point with the egg production–recruitment curve and we predict a stock collapse at this level of fishing mortality.