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- W2100873018 abstract "ABSTRACf Annual finite rates of increase in dolphin population size were estimated to vary up to a maximum of 1.09, using simulation, based on ranges in Vital rate ranges were defined from values reported in the literature where possible. otherwise by making assumptions about biological or logical limits. Given information on current values. or limits, of one or more rate, one can use the figures presented to determine ranges of possible rates of increase in population size. The highest rates estimated here (up to 1.09) are probably unrealistic. because of the unlikely combinations of high fecundity and low mor tality needed to achieve them. Rates of increase in population size are important in determining managementstrategies for fish and wildlife subject to exploitation. A common manage ment approach for setting incidental mortality or harvest quotas is to use a stock-production model (Schaeffer 1957; Allen 1976) with an assumed max imum rate of increase. For dolphins and other ceta ceans, rates of increase have proven extremely dif ficult to measure directly. Nonetheless. estimates of this parameter are sometimes necessary, e.g., in setting incidental mortality quotas for dolphin populations involved in the eastern tropical Pacific purse seine fishery for yellowfin tuna (Smith 1983). In such situations, even a range, when rigorously defined, can contribute substantially to delineating the management options. In this paper we define a range of reasonable values of rate of increase (hereafter also referred to as ROI) in dolphin population size, given what is known or can be inferred about their age-specific survival and fecundity distributions, or vital rates. We estimate rates of increase using population pro jection matrices for various parameter combina tions. We also suggest how the resulting ranges in ROI can be further narrowed, given specific infor mation for an individual population. There are many slightly different definitions for rate ofincrease, but all share the commonsense no tion of change in population size over time. Caughley (1977) reiterated the distinction between exponen tial and finite rates: finite rates, here symbolized A, are related to exponential rates, here symbolized r, by the simple conversion A = e T" @default.
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- W2100873018 date "1986-01-15" @default.
- W2100873018 modified "2023-09-27" @default.
- W2100873018 title "RATES OF INCREASE IN DOLPHIN POPULATION SIZE" @default.
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