Formulae for calculating the instantaneous rate of natural mortality of animals from its surrogates
✍ Scribed by Yongshun Xiao
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 771 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0895-7177
No coin nor oath required. For personal study only.
✦ Synopsis
Interspeci relationships between the instantaneous rate of natural mortality of fish in a natural population end its surrogates are useful for studies of their population dynamica. In this paper, I derive interspecific models for the instantaneous rate of natural mortality of animals in a natural population aa a function of age-, length-, and mass-based surrogates, demonstrate their relationships with exlsting interspecific models, and fit them into data from three groupe of animals. At temporal equilibrium, and for the most stable distribution of individuals of a population, the sum of the population's instantaneous ratea of natural and fishing mortalities la in inverse proportion to its characteristic age or app roximately to its mean age, thereby decreasing with its obeerved maxhnum age and increasing linearly with the rate of its individual's growth in length or mem. Fitting of these age-, length-, and mass-based models to data from cetaceans, fishes, and benthic invertebrates showed that the instantaneous rate of natural mortality is 4.7725 (f0.1365) timee the reciprocal of the observed maximum age of a cetacean population, 1.2718 (f0.1944) timea the growth rate of individuals in a fish population, and 2.4825 (zkO.1262) times the growth rate of individuals in a population of benthic invertebrates. @