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倒挂生存：洞穴中红珊瑚的定居模式

Living upside down: patterns of red coral settlement in a cave.

作者信息

Costantini Federica, Rugiu Luca, Cerrano Carlo, Abbiati Marco

机构信息

Department of Biological, Geological and Environmental Sciences (BiGEA), University of Bologna, Ravenna, Italy.

Centro Interdipartimentale di Ricerca per le Scienze Ambientali (CIRSA), Ravenna, Italy.

出版信息

PeerJ. 2018 May 21;6:e4649. doi: 10.7717/peerj.4649. eCollection 2018.

DOI:10.7717/peerj.4649
PMID:29844950
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5967367/
Abstract

BACKGROUND

Larval settlement and intra-specific interactions during the recruitment phase are crucial in determining the distribution and density of sessile marine populations. Marine caves are confined and stable habitats. As such, they provide a natural laboratory to study the settlement and recruitment processes in sessile invertebrates, including the valuable Mediterranean red coral . In the present study, the spatial and temporal variability of red coral settlers in an underwater cave was investigated by demographic and genetic approaches.

METHODS

Sixteen PVC tiles were positioned on the walls and ceiling of the Colombara Cave, Ligurian Sea, and recovered after twenty months. A total of 372 individuals of red coral belonging to two different reproductive events were recorded. Basal diameter, height, and number of polyps were measured, and seven microsatellites loci were used to evaluate the genetic relationships among individuals and the genetic structure.

RESULTS

Significant differences in the colonization rate were observed both between the two temporal cohorts and between ceiling and walls. No genetic structuring was observed between cohorts. Overall, high levels of relatedness among individuals were found.

CONCLUSION

The results show that individuals on tiles are highly related at very small spatial scales, suggesting that nearby recruits are likely to be sibs. Self-recruitment and the synchronous settlement of clouds of larvae could be possible explanations for the observed pattern.

摘要

背景

在固着海洋生物种群的分布和密度确定过程中，幼体附着以及补充阶段的种内相互作用至关重要。海洋洞穴是封闭且稳定的栖息地。因此，它们为研究包括珍贵的地中海红珊瑚在内的固着无脊椎动物的附着和补充过程提供了一个天然实验室。在本研究中，通过人口统计学和遗传学方法研究了水下洞穴中红珊瑚定居者的时空变异性。

方法

在利古里亚海的科隆巴拉洞穴的墙壁和天花板上放置了16块PVC板，20个月后回收。记录了总共372个属于两个不同繁殖事件的红珊瑚个体。测量了基部直径、高度和珊瑚虫数量，并使用七个微卫星位点来评估个体之间的遗传关系和遗传结构。

结果

在两个时间群组之间以及天花板和墙壁之间，均观察到定殖率存在显著差异。在群组之间未观察到遗传结构。总体而言，发现个体之间的亲缘关系水平较高。

结论

结果表明，板上的个体在非常小的空间尺度上高度相关，这表明附近的新附着个体可能是同胞。自我补充和幼虫云团的同步附着可能是对观察到的模式的解释。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/f6418298a48c/peerj-06-4649-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/7b258c0ec11a/peerj-06-4649-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/a3460bcdd321/peerj-06-4649-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/54cb11216d0d/peerj-06-4649-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/1fdeecab8c7d/peerj-06-4649-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/81c3164f6e7c/peerj-06-4649-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/4bdb34a67f67/peerj-06-4649-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/f6418298a48c/peerj-06-4649-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/7b258c0ec11a/peerj-06-4649-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/a3460bcdd321/peerj-06-4649-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/54cb11216d0d/peerj-06-4649-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/1fdeecab8c7d/peerj-06-4649-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/81c3164f6e7c/peerj-06-4649-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/4bdb34a67f67/peerj-06-4649-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/24a8/5967367/f6418298a48c/peerj-06-4649-g007.jpg

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