ANALYSIS OF THE NORTHERN FUR SEAL (CALLORHINUS URSINUS) DYNAMICS ON THE TYULENIY ISLAND BASED ON A SIMPLE MATHEMATICAL MODEL OF LOCAL POPULATION

O.L. Zhdanova, O.V. Bondrova, A.E. Kuzin, Е.Ya. Frisman

Аннотация


The northern fur seal (Callorhin usursinus), inhabiting North Pacific, has long been a valuable commercial target. This work continues a series of studies aimed at analyzing the dynamics and reproductive characteristics of the northern fur seal population on the Tyuleniy Island. The paper provides analyzes of intrapopulation parameters influence on the population sex ratio and pups production. 


Ключевые слова


Callorhinus ursinus; northern fur seal; harvest; reproductive characteristics of females; age at first birth; proportion of pregnant females.

Литература


REFERENCE: Zhdanova O.L., Bondrova O.V., Kuzin A.E., Frisman Е.Ya. Analysis of the northern fur seal (Callorhinus ursinus) dynamics on the Tyuleniy Island based on a simple mathematical model of local population. Regional’nye problemy, 2024, vol. 27, no. 3, pp. 32–34. (In Russ.). DOI: 10.31433/2618-9593-2024-27-3-32-34.

Zhdanova O.L., Kuzin A.E., Frisman E.Ya. Analysis of harvest structure and growth dynamics of the northern fur seal herd (Callorhinus ursinus) on Tyuleniy Island during the exploitation and after its ban. Regional’nye problemy, 2024, vol. 27, no. 1, pp. 21–35. (In Russ.). DOI: 10.31433/2618-9593-20224-27-1-21-35.

Zhdanova O.L., Kuzin A.E., Frisman E.Y. The Survival Dynamics of Male Northern Fur Seals (Callorhinus Ursinus) on Tyulenii Island, Sea of Okhotsk, Based on Long-Term Observations. Zoologicheskii zhurnal, 2017, vol. 96, no. 6, pp. 720–739. (In Russ.). DOI: 10.1134/S1062359017090175.

Frisman E.Ya., Skaletskaya E.I., Kuzin A.E. Mathematical modeling of the abundance dynamics of the northern fur seal, Callorhinus ursinus. The simplest model of the local population. Zhurnal obshchei biologii, 1980, vol. 41, no. 2, pp. 270–277. (In Russ.).

Heppell S., Caswell H., Crowder L.R. Life histories and elasticity patterns: Perturbation analysis of species with minimal demographic data. Ecology, 2000, vol. 81, pp. 654–665.

Maestri M.L., Ferrati R., Berkunsky I. Evaluating management strategies in the conservation of the critically endangered Blue-throated Macaw (Ara glaucogularis). Ecol. Model., 2017, vol. 361, pp. 74–79.


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