GRAZING LIMITATION AND NUTRIENT LIMITATION IN MARINE ECOSYSTEMS - STEADY-STATE SOLUTIONS OF AN ECOSYSTEM MODEL WITH MULTIPLE FOOD-CHAINS
GRAZING LIMITATION AND NUTRIENT LIMITATION IN MARINE ECOSYSTEMS - STEADY-STATE SOLUTIONS OF AN ECOSYSTEM MODEL WITH MULTIPLE FOOD-CHAINS
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DOI：
10.4319/lo.1994.39.3.0597
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发表时间：
1994-05-01
影响因子：
4.5
通讯作者：
ARMSTRONG, RA
中科院分区：
文献类型：
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作者：
ARMSTRONG, RA
在这里，我开发了一个模型，多个浮游植物-浮游动物食物链，每个食物链是基于不同大小的藻类。选择模型参数是为了让基于较小藻类大小类别的食物链在贫营养条件下占据主导地位，随着营养负荷的增加，依次添加较大藻类大小类别。该模型利用大小类之间的异速生长关系，以尽量减少自由参数的数量，便于其稳态行为的数值探索。该模型是简单的，但它是足够复杂的，允许同时捕食者限制藻类大小类（或物种）和营养盐限制的总浮游植物生物量。这种观点，不能从模型与单一的浮游植物和浮游动物的大小类，适用于特定的情况下，在赤道太平洋的硝酸盐含量升高。该模型清楚地表明，它是可能的，每个浮游植物的大小类，以限制其食草动物，而在同一时间的微量营养素（特别是铁）缺乏可能会限制的数量的大小类，可以存在于社会，因此，总浮游植物生物量，可以支持。
Here I develop a model with multiple phytoplankton-zooplankton food chains where each food chain is based on a different size class of algae. Model parameters were chosen to allow food chains based on smaller algal size classes to dominate under oligotrophic conditions, with larger size classes being added sequentially with increased nutrient loading. The model makes use of allometric relations among size classes to minimize the number of free parameters, facilitating numerical exploration of its steady state behavior. The model is simple, yet it is complex enough to allow simultaneous predator limitation of algal size classes (or species) and nutrient limitation of total phytoplankton biomass. This perspective, not obtainable from models with single phytoplankton and zooplankton size classes, is applied to the particular case of elevated nitrate levels in the equatorial Pacific. The model shows clearly that it is possible for each phytoplankton size class to be limited by its herbivores, while at the same time micronutrient (notably iron) deficiency may limit the number of size classes that can exist in the community and hence the total phytoplankton biomass that can be supported.