Decay and persistence of empty bivalve shells in a temperate riverine system.
Decay and persistence of empty bivalve shells in a temperate riverine system.
复制标题
温带河流系统中双壳贝空壳的腐烂和持久性。
DOI：
10.1016/j.scitotenv.2019.05.208
复制
发表时间：
2019
期刊：
影响因子：
--
通讯作者：
R. Sousa
中科院分区：
文献类型：
--
作者：
M. Ilarri;A. Souza;L. Amorim;R. Sousa
双壳类贝壳可以在一个地质时期内持续存在，是相关动物群的重要物质资源。然而，很少有研究调查其相关性作为持久的长期生态属性的生态系统。因此，研究不同环境条件下的河流系统中的贝壳衰变具有重要意义。为此目的，提供了四种双壳类（Anodonta anatina、Corbicula fluminea、Potomida littoralisandUnio delphinus）的贝壳，分别提供了不同大小的贝壳群。河流流量和季节性的影响进行了评估，通过记录全年在lentic和lotic栖息地的贝壳的腐烂率。我们的研究结果表明，不同物种的腐烂，并取决于壳的大小，水流和季节。月平均腐烂率最高的是薄壳种鸭舌蚌和海豚，分别为3.17%和2.77%，最低的是厚壳种河鲀和滨海对虾，分别为2.02%和1.83%。大小是解释衰变的一个相关变量，最小的贝壳呈现最高值，比其他大小类高1.2-2.0倍。此外，鲁棒性被证明是最相关的功能，解释厚壳物种的腐烂。河流流量也是一个相关的描述符的腐烂，与较高的腐烂观察到的lentic栖息地相比，在lentic。此外，主要在夏季（静水区）和秋季（静水区）观察到较低的衰变，这与叶子的埋葬效应有关。综上所述，本地物种A. anatina和U. delphinus的贝壳预计将持续存在，并作为生境工程物种的贡献小于本地P. littoralis和入侵C. flumineas物种的贝壳。这是特别有效的，其中腐烂的lentic栖息地高达2.13倍以上。
Bivalve shells can persist over a geological time, acting as important physical resources to the associated fauna. However, few studies have investigated their relevance as persistent long-term ecological attributes to the ecosystem. As such, it is relevant to investigate the shell decays in riverine systems subjected to different environmental conditions. Towards this end, shells of four bivalve species (Anodonta anatina,Corbicula fluminea,Potomida littoralisandUnio delphinus) were made available individually and in clusters of different sizes. The effects of river flow and seasonality were assessed by recording the decay rates of shells in lentic and lotic habitats throughout the year. Our results evidenced that the decays varied among species and depend on shell size, water flow and season. Thin shelled species (A.anatinaandU.delphinus) showed the highest mean percentage of decay per month, 3.17% (lotic) and 2.77% (lotic), respectively, and thick shelled species (C.flumineaandP.littoralis) the lowest, 2.02% (lotic) and 1.83% (lotic), respectively. Size was a relevant variable explaining decays, with the smallest shells presenting the highest values, 1.2–2.0 times higher compared to the other size classes. Also, robustness showed to be the most relevant feature explaining the decays in thick shelled species. River flow was also a relevant descriptor of the decays, with higher decays observed in the lotic compared to the lentic habitats. Furthermore, lower decays were observed mainly during summer (lentic site), and autumn (lotic site) associated to the burial effect of leaves. In summary, shells of the native speciesA.anatinaandU.delphinusare expected to persist and contribute less as habitat engineering species, than shells of the nativeP.littoralisand invasiveC.flumineaspecies. This is especially valid to lotic habitats where the decays were up to 2.13 times higher than in lentic habitats.
失踪的死者：动物遗骸在北美河流养分循环中失去的作用
影响因子：
1.7
作者：
Wenger, Seth J.;Subalusky, Amanda L.;Freeman, Mary C.
通讯作者：
Freeman, Mary C.
影响因子：
11.6
作者：
Bednarsek, N.;Tarling, G. A.;Montagna, R.
通讯作者：
Montagna, R.