当前位置: X-MOL 学术Anthropocene › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Molluscan metacommunity dynamics in the Colorado River estuary, Mexico before upstream water diversion
Anthropocene ( IF 3.6 ) Pub Date : 2019-01-30 , DOI: 10.1016/j.ancene.2019.100194
Jansen A. Smith , Gregory P. Dietl

The magnitude and effect of rapid environmental change during the “Anthropocene” is often underestimated due to a paucity of pre-impact data with which to contextualize the change, potentially compromising the efficacy of conservation and restoration efforts. Geohistorical records can fill this gap. This study utilizes accumulations of molluscan shells from the past 100–300 years at three sites along a past salinity gradient in the Colorado River estuary to determine which of four major paradigms of metacommunity theory (environmental filtering, mass effects, patch dynamics, and neutrality) best explained community assembly. The effectiveness of ongoing conservation efforts in this anthropogenically altered estuary may depend on the dominant paradigm controlling community assembly. Differentiating between paradigms using model fits of species abundance distributions and their subsequent deconstruction by commonness and environmental preference showed that community assembly in the past molluscan community was controlled by a combination of environmental filtering and mass effects. It was highly probable (p>0.999) to find a species with estuarine preference in the common component of the low-salinity northern site as compared with the two more southern marine sites, suggesting an important role for environmental filtering. At each site, species with mismatched environmental preferences and strong dispersal capacities were present in the common component, providing evidence to support mass effects. Given the importance of species’ environmental preferences in environmental filtering and that of dispersal capacity under mass effects, these results suggest that the most effective conservation strategies for the molluscan metacommunity in the Colorado River estuary would be to restore the brackish conditions preferred by estuarine species and maintain populations of those species so as to ensure their capacity to disperse.



中文翻译:

在上游调水之前,墨西哥科罗拉多河河口的软体动物元社区动态

人们常常低估“人类世”期间快速环境变化的严重性和影响,因为缺乏影响背景的变化前影响数据,这有可能损害保护和恢复工作的效力。地理历史记录可以填补这一空白。这项研究利用了过去100-300年间在科罗拉多河河口过去盐度梯度上三个地点的软体动物壳的积累来确定元群落理论的四个主要范式中的哪一个(环境过滤,质量效应,斑块动力学和中性)最好的解释社区集会。在这个人为改变的河口,正在进行的保护工作的有效性可能取决于控制社区集会的主导范式。使用物种丰度分布的模型拟合来区分范式,然后通过公共性和环境偏好对它们进行解构,可以看出过去软体动物群落的群落组装受环境过滤和质量效应的组合控制。这很有可能(p > 0.999),发现在低盐度北部站点的共同组成部分中,相比于另外两个南部海洋站点,有河口偏好的物种,表明在环境过滤中具有重要作用。在每个地点,共同组成部分中存在环境偏好不匹配且扩散能力强的物种,为支持质量效应提供了证据。考虑到物种对环境的偏好在环境过滤中的重要性以及在质量效应下的扩散能力的重要性,这些结果表明,科罗拉多河河口软体动物元社区最有效的保护策略将是恢复河口物种偏爱的咸淡条件。维持这些物种的种群,以确保其扩散能力。

更新日期:2019-01-30
down
wechat
bug