کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4374749 1617199 2016 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Using Daphnia physiology to drive food web dynamics: A theoretical revisit of Lotka-Volterra models
ترجمه فارسی عنوان
استفاده از فیزیولوژی دافنی برای تحریک دینامیک شبکه غذایی: یک بازبینی نظری از مدل های لوتکا - ولترا
کلمات کلیدی
مدل های لوتکا ولترا؛ اکوفیزیولوژی دافنی؛ دینامیک وب غذایی؛ متابولومیک؛ تعاملات شکارگرهای
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• We augment a Lotka–Volterra system with an ecophysiological model for the predator.
• Maximal allocation of energy to growth is achieved through a balanced diet.
• Predators with low minimum somatic quotas thrive in resource limiting conditions.
• Multiple stable equilibria emerge reflecting different prey-to-predator ratios.
• Shifts to alternate states are induced by variations in food quantity and quality.

The Lotka–Volterra model is the most commonly used framework to describe the dynamics of ecological systems in which two species interact, one as a predator and the other as prey. Theoretical ecologists have since built on variants of these equations, frequently applying them to model the dynamics of algal-herbivore interactions in aquatic systems. In this study, we augment a Lotka–Volterra system by introducing a bioenergetically-explicit, ecophysiological model to examine how variations in resource allocation affect zooplankton growth and subsequently phytoplankton dynamics. Ingested material within a zooplankter's gut is separated into distinct internal congener pools that are used to support physiological processes occurring in a hierarchical direction: neurological functions, energetics, osmoregulatory maintenance, waste management, and finally growth. Consistent with the predictions of the “stoichiometric knife edge” theory, our analysis suggests that a balanced algal congener composition is required to optimize zooplankton internal congener saturations, resulting in a maximal allocation of energy to growth. In examining the advantages rendered by different strategies of minimum and optimum somatic quotas when experiencing phosphorus-enrichment conditions, we show that herbivores with narrow homeostatic bounds and animals with low minimum quotas (or depletion specialists) achieve optimal performance first. Our analysis also predicts patterns of multiple stable equilibria in which the same environmental conditions can be characterized by dramatically different prey-to-predator ratios. Importantly, abrupt shifts from one state to another can be induced not only by short-term variations in food abundance but also by variations in the nutritional quality of the prey. Our predictions have profound implications for connecting microscopic processes with macroscopic patterns and offer new insights into the multitude of factors that modulate food web dynamics.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Informatics - Volume 35, September 2016, Pages 29–42
نویسندگان
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