کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4550200 1328136 2011 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Age, growth and mortality in the giant snail Adelomelon beckii (Broderip 1836) on the Argentinean shelf
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
پیش نمایش صفحه اول مقاله
Age, growth and mortality in the giant snail Adelomelon beckii (Broderip 1836) on the Argentinean shelf
چکیده انگلیسی

The marine subtidal volutid snail Adelomelon beckii was studied in order to obtain their population dynamics, particularly on growth, age, mortality and production. Stable oxygen isotope ratios confirmed semiannual formation of internal growth marks. A von Bertalanffy growth model fitted 308 size-at-age data pairs. A. beckii potential lifespan in Mar del Plata (Argentina) region is 29 years, being rather long lived compared to other large gastropods. Total mortality Z and natural mortality M were calculated to be 0.210 y−1 and 0.081 y−1 respectively. Fishing mortality F amounts to 0.129 y−1 corresponding to an exploitation rate E of 0.614, a value much beyond the optimum rate of 0.427. The current exploitation regime will be unsustainable in the long run unless a proper management approach establishes.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Sea Research - Volume 65, Issue 2, February 2011, Pages 219–223
نویسندگان
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