The effects of temperature and flooding duration on the structure and magnitude of a floodplain prey subsidy
The effects of temperature and flooding duration on the structure and magnitude of a floodplain prey subsidy
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温度和洪水持续时间对洪泛区猎物补贴的结构和规模的影响
DOI：
10.1111/fwb.14145
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发表时间：
2023
影响因子：
2.7
通讯作者：
Rehage, Jennifer S.
中科院分区：
文献类型：
--
作者：
Rezek, Ryan J.;Massie, Jordan A.;Nelson, James A.;Santos, Rolando O.;Viadero, Natasha M.;James, W. Ryan;Boucek, Ross E.;Rehage, Jennifer S.
河流洪泛区是陆地和水生系统之间的重要纽带，因为水位的上升和下降驱动空间食物网补贴，这对生态系统的功能和稳定至关重要。由于这些系统越来越受到水文变化和气候变化的影响，了解洪泛区空间食物网补贴如何应对不断变化的环境条件非常重要。在这里，我们研究了翻车鱼（Lepomisspp.）猎物补贴结构的年际变化，从淡水沼泽到佛罗里达州沿海大沼泽地鲁克里支红树林衬里的小溪，这种情况发生在季节性干旱期间。我们根据 16 年的电捕鱼数据集评估了这项补贴的结构与之前的温度和水文状况的关系。我们还描述了沼泽水深和翻车鱼迁徙模式之间的年内关系，这些关系构成了这种补贴的基础。我们发现，翻车鱼猎物补贴的丰度和多样性的年际变化可以通过峰值丰度采样期之前 90 天内出现的最低水温得到最好的解释，最低水温较低与翻车鱼丰度和多样性较高相关。相比之下，翻车鱼猎物补贴生物量的年际变化与前一个雨季期间超过30厘米深度的沼泽洪水持续时间呈正相关。年度内模型估计，当沼泽深度在 10 至 15 厘米之间时，河流生境中翻车鱼丰度和生物量的峰值出现在湿润期和干旱期的过渡期间。对群落丰度和生物量组成的多变量分析表明，最低水温在构建猎物补贴方面发挥着重要作用，而洪水持续时间的影响较弱。这些结果为了解洪泛区猎物补贴在未来气候和水文状况下如何改变提供了重要见解，并为基于生态系统的水管理决策提供了信息。
Riverine floodplains serve as an important link between terrestrial and aquatic systems, as the rising and falling of water drive spatial food web subsidies that are critical to the functioning and stability of ecosystems. As these systems are increasingly impacted by hydrological alterations and climate change, it is important to understand how floodplain spatial food web subsidies may respond to changing environmental conditions.Here, we examine the interannual variation in the structure of a sunfish (Lepomisspp.) prey subsidy from freshwater marshes into the mangrove‐lined creeks of Rookery Branch in the Florida Coastal Everglades that occurs during seasonal dry downs. We evaluate how the structure of this subsidy relates to prior temperature and hydrological regimes based on a 16‐year electrofishing dataset. We also characterise the intra‐annual relationship between marsh water depths and sunfish migration patterns that underlie this subsidy.We found that interannual variation in the abundance and diversity of the sunfish prey subsidy was best explained by the minimum water temperature occurring within 90 days prior to peak abundance sampling periods, with lower minimum water temperatures associated with higher sunfish abundance and diversity. In contrast, interannual variations in the biomass of the sunfish prey subsidy were positively related to marsh flooding duration over 30 cm depth during the prior wet season. Intra‐annual models estimated peak sunfish abundance and biomass values in riverine habitats to occur during the transition between wet and dry periods when marsh depths are between 10 and 15 cm.Multivariate analysis of community abundance and biomass composition revealed that minimum water temperatures played an important role in structuring the prey subsidy, while the effect of flooding duration was weak. These results provide important insight into how floodplain prey subsidies may be altered under future climate and hydrological regimes and inform ecosystem‐based water management decisions.
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DOI：
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发表时间：
1992
期刊：
影响因子：
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作者：
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发表时间：
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DOI：
--
发表时间：
1995
期刊：
影响因子：
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