Drivers of ecosystem vulnerability to Corbicula invasions in southeastern North America
Drivers of ecosystem vulnerability to Corbicula invasions in southeastern North America
复制标题
DOI：
10.1007/s10530-022-02751-4
复制
发表时间：
2022-02-14
影响因子：
2.9
通讯作者：
Atkinson, Carla L.
中科院分区：
文献类型：
--
作者：
Ferreira-Rodriguez, Noe;Gangloff, Michael;Atkinson, Carla L.
入侵物种引进是目前正在发生的重大全球生态危机之一。确定导致入侵物种成功的因素是实施有效管理行动的关键。这种侵入性的滤食性双壳类，Corbrula，特别令人感兴趣，因为它已经在北美和其他地方的许多河流流域随处可见。在这里，我们在俄克拉荷马州东南部和阿肯色州西南部的瓦奇塔高地以及阿拉巴马州的墨西哥湾沿岸平原采集了双壳类组合、环境指标和土地覆盖参数，以测试三种工作模型(使用结构方程建模，SEM)，这些模型基于关于Corbrula入侵的先验科学知识。我们的模型检验了三个相互矛盾的假说：(1)本土贻贝的减少与流域水平的土地利用变化有关，随后的河蚌定居是空生态位的结果；(2)河蚌的丰度是导致本土贻贝衰退的因素之一，并与流域水平的土地利用变化存在交互作用；(3)本土贻贝的衰退和河口的成功都与流域水平的土地利用变化有关。我们没有发现支持前两个假设的证据。然而，我们发现在分水岭尺度上的环境指标和土地覆盖参数是河蚌丰度的稳健预测因子。尤其是农用地覆盖与河口密度呈正相关。这些结果表明，进一步改进传统农业做法，包括优化化肥输送系统，可能是通过限制向河流生态系统输入养分来管理该物种的机会。通过提供包括沉积物和养分保留在内的关键生态系统服务，保护广泛的泛滥平原生境可能有助于缓冲这些投入。
Invasive species introduction is one of the major ongoing ecological global crises. Identifying factors responsible for the success of invasive species is key for the implementation of effective management actions. The invasive filter-feeding bivalve, Corbicula, is of particular interest because it has become ubiquitous in many river basins across North America and elsewhere. Here we sampled bivalve assemblages, environmental indicators, and land cover parameters in the Ouachita highlands in southeastern Oklahoma and southwestern Arkansas, and in the Gulf Coastal Plain of Alabama to test three working models (using structural equation modeling, SEM) based on a priori scientific knowledge regarding Corbicula invasions. Our models tested three competing hypotheses: (1) Native mussel declines are related to land use changes at the watershed level and subsequent Corbicula colonization is a result of an empty niche; (2) Corbicula abundance is one of the factors responsible for native mussel declines and has an interactive effect with land use change at the watershed level; (3) Native mussel declines and Corbicula success are both related to land use changes at the watershed level. We found no evidence for the first two hypotheses. However, we found that environmental indicators and land cover parameters at the watershed scale were robust predictors of Corbicula abundance. In particular, agricultural land cover was positively related with Corbicula density. These results suggest that further improvement of conventional agricultural practices including the optimization of fertilizer delivery systems may represent an opportunity to manage this species by limiting nutrient inputs to stream ecosystems. Preservation of extensive floodplain habitats may help buffer these inputs by providing key ecosystem services including sediment and nutrient retention.