Individual size distributions across North American streams vary with local temperature
Individual size distributions across North American streams vary with local temperature
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DOI：
10.1111/gcb.15862
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发表时间：
2021-08
影响因子：
11.6
通讯作者：
J. Pomeranz;James R. Junker;Jeff S. Wesner
中科院分区：
文献类型：
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作者：
J. Pomeranz;James R. Junker;Jeff S. Wesner
描述生态群落内丰度与体型之间的负相关关系的参数提供了许多重要生物过程的概述。虽然它被认为是生态学中为数不多的一致模式之一，但这种关系在大陆尺度温度梯度上的时空变化是未知的。利用在北美（北纬18-68°，年平均气温-4至25°C）收集的溪流群落数据库，我们构建了160个个体大小分布（ISD）关系（即丰度大小谱）。描述ISD的指数参数随着年平均温度的增加而降低（变得更陡），在29°C的温度梯度上，中位斜率变化约0.2个单位。此外，群落总生物量随温度升高而增加，与理论预测相反。我们的研究表明，在广泛的自然环境梯度的流中的ISD关系的保护。这支持了尺寸谱偏差作为生态群落结构和功能根本变化指标的新兴用途。
Parameters describing the negative relationship between abundance and body size within ecological communities provide a summary of many important biological processes. While it is considered to be one of the few consistent patterns in ecology, spatiotemporal variation of this relationship across continental scale temperature gradients is unknown. Using a database of stream communities collected across North America (18–68°N latitude, −4 to 25°C mean annual air temperature) over 3 years, we constructed 160 individual size distribution (ISD) relationships (i.e. abundance size spectra). The exponent parameter describing ISD’s decreased (became steeper) with increasing mean annual temperature, with median slopes varying by ~0.2 units across the 29°C temperature gradient. In addition, total community biomass increased with increasing temperatures, contrary with theoretical predictions. Our study suggests conservation of ISD relationships in streams across broad natural environmental gradients. This supports the emerging use of size‐spectra deviations as indicators of fundamental changes to the structure and function of ecological communities.