Effects of bycatch on the population viability of the narrow-ridged finless porpoises in Ariake Sound and Tachibana Bay, Japan

Authors
Hashimoto, M., Shirakihara, K. and Shirakihara, M.
Year
Journal/Publisher Name
Endangered Species Research
Volume (Issue #)
27
Page #s
87-94
Contact information
midori_84-10a@nenv.k.u-tokyo.ac.jp
Summary

A Leslie Matrix model was used to simulate the impact of bycatch mortality on the narrow-ridged finless porpoise (Neophocaena asiaeorientalis). Based on the model results, there is an annual rate of decrease of 0.671 to 3.87%, with a population reduction of 29.6 to 86.3% over three generations. The most optimistic simulation showed at least a 30% reduction in population size. Therefore, reported bycatch mortality rates pose a substantial threat to this species.

Field Studies

Effects of bycatch on the population viability of the narrow-ridged finless porpoises in Ariake Sound and Tachibana Bay, Japan

Study Type
Study in the lab
Location
Ariake Sound and Tachibana Bay
Effect on bycatch species
Bycatch mortality will lead to at least a 29.6-86.3% decrease in the population size over three generations