Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Estimation of mortality coefficients and survivorship curves for minke whales (Balaenoptera acutorostrata) in Korean waters

  • Zhang, Chang-Ik (Division of Marine Production System Management, Pukyong National University) ;
  • Song, Kyung-Jun (University-Research Institute Interdisciplinary Program of Fisheries and Oceanography, Pukyong National University) ;
  • Na, Jong-Hun (Division of Marine Production System Management, Pukyong National University)
  • Received : 2010.04.22
  • Accepted : 2010.07.27
  • Published : 2010.12.31
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Abstract

Population ecological characteristics of growth and mortality play an important role in understanding the population dynamics of marine mammals. The instantaneous coefficients of natural and bycatch mortality were estimated for minke whales (Balaenoptera acutorostrata) in Korean waters using a population assessment model composed of bycatch and abundance data. The survivorship curve of this population was fitted to the data, and then the curve was revised using age-specific relative bycatchability coefficients ($q_t$). Instantaneous coefficients of natural and bycatch mortality of minke whales were estimated as 0.024/year and 0.076/year, respectively, and from this the survival rate was estimated as 0.905. This estimated survival rate was comparable to other cetaceans in other regions. The $q_t$ for this population ranged from 0.020 to 0.193. The revised survival rates were higher when the $q_t$ was taken into account. The mortality coefficient, survival rate, $q_t$ and survivorship curves had not previously been determined for minke whale in this area. This estimate could serve as fundamental information to assess the status of this population and for conservation and rational management.

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