Animal-Driven Nutrient Supply Declines Relative to Ecosystem Nutrient Demand Along a Pond Hydroperiod Gradient
Animal-Driven Nutrient Supply Declines Relative to Ecosystem Nutrient Demand Along a Pond Hydroperiod Gradient
复制标题
动物驱动的营养供应相对于生态系统营养需求沿着池塘水周期梯度下降
DOI：
10.1007/s10021-021-00679-9
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发表时间：
2021-08-17
期刊：
影响因子：
3.7
通讯作者：
Taylor, Brad W.
中科院分区：
文献类型：
--
作者：
Balik, Jared A.;Jameson, Emily E.;Taylor, Brad W.
在许多静水生态系统中，水文周期或淹没的持续时间控制着动物群落的组成和生物量。虽然在湿地动物群落的水文周期施加的差异可能会导致动物驱动的养分供应的差异，水文周期没有被认为是动物驱动的养分循环模式的调查模板。在这里，我们使用营养排泄率（NH 4-N和SRP）和生物量的浮游和底栖无脊椎动物和蝾螈和营养吸收率的模拟模型，以估计动物驱动的营养供应和池塘水平的需求沿着水文周期梯度的12个亚高山池塘在美国落基山脉，容易受到气候变化的影响。我们发现，动物的生物量增加与水文周期的持续时间和生物量预测动物驱动的供应之间的水文周期分类（临时永久）的贡献。因此，社区范围内的供应是最大的永久池塘。动物驱动的N供应超过永久性和半永久性池塘的需求，而P供应等于需求。相反，临时池塘有很大的赤字，由于较低的社区生物量和水文引起的限制占主导地位的供应商（寡毛类和摇蚊）的N和P供应。分类群特定的供应的分布也不同的水周期，供应占主导地位的几个分类群在永久池塘和供应更均匀地分布在临时池塘分类群。临时池塘中主要供应者的缺乏或较低的生物量造成营养缺乏和生产力的可能限制。因此，随着气候变暖导致水文周期变得越来越短暂，并间接促使生物量下降和成分变化，动物驱动的营养供应将减少，由于动物驱动的供应丧失，可能会出现强烈的营养限制。
In many lentic ecosystems, hydroperiod, or the duration of inundation, controls animal community composition and biomass. Although hydroperiod-imposed differences in wetland animal communities could cause differences in animal-driven nutrient supply, hydroperiod has not been considered as a template for investigating patterns of animal-driven nutrient cycling. Here, we use nutrient excretion rates (NH4-N and SRP) and biomasses of pelagic and benthic invertebrates and salamanders and nutrient uptake rates in a simulation model to estimate animal-driven nutrient supply and pond-level demand along a hydroperiod gradient of 12 subalpine ponds in the U.S. Rocky Mountains that are vulnerable to climate change. We found that animal biomass increased with hydroperiod duration and biomass predicted animal-driven supply contributions among hydroperiod classifications (temporary-permanent). Consequently, community-wide supply was greatest in permanent ponds. Animal-driven N supply exceeded demand in permanent and semi-permanent ponds, whereas P supply equaled demand in both. Conversely, temporary ponds had large deficits in N and P supply due to lower community biomass and hydroperiod-induced constraints on dominant suppliers (oligochaetes and chironomids). The distribution of taxon-specific supply also differed among hydroperiods, with supply dominated by a few taxa in permanent ponds and supply more evenly distributed among temporary pond taxa. The absence or lower biomass of dominant suppliers in temporary ponds creates nutrient deficits and possible limitation of productivity. Thus, as climate warming causes hydroperiods to become increasingly temporary and indirectly prompts biomass declines and compositional shifts, animal-driven nutrient supply will decrease and strong nutrient limitation may arise due to loss of animal-driven supply.