کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4548993 1627343 2008 19 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bottom–up and top–down forcing in a simple size-structured plankton dynamics model
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات اقیانوس شناسی
پیش نمایش صفحه اول مقاله
Bottom–up and top–down forcing in a simple size-structured plankton dynamics model
چکیده انگلیسی

A size-structured plankton dynamics model is developed and used to explore the effects of variations in bottom–up and top–down forcing upon the biomass spectrum, size-structured patterns in primary production, and the flux of energy from primary producers to fish. Parameters and mechanisms controlling the steady-state model response to bottom–up forcing via nutrient enrichment and top–down forcing via fluctuations in planktivorous fish are first diagnosed. Results are then compared with mean observed biomass spectra from three ecosystems spanning a broad range of productivity. Solutions using parameters within empirical ranges can recreate trends in the biomass spectrum across these systems. The zooplankton gross growth efficiency is critical for matching the steady-state slopes of the spectra. Variability in export sources and zooplankton half-saturation constants both provide ways of matching the mean biomass. Results support the model's potential to provide mechanistic insights and testable quantitative hypotheses for the dynamics underlying observed biomass spectra.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Marine Systems - Volume 74, Issues 1–2, November 2008, Pages 134–152
نویسندگان
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