Spatial variability of epibiotic assemblages on marina pontoons in Singapore
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- 作者：Kok Ben Toh ; Chin Soon Lionel Ng ; Bokai Wu ; Tai Chong Toh…
- 关键词：Marina ; Artificial habitats ; Epibiota ; Distribution ; Tropics
- 刊名：Urban Ecosystems
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：20
- 期：1
- 页码：183-197
- 全文大小：
- 刊物类别：Biomedical and Life Sciences
- 刊物主题：Urban Ecology; Environmental Management; Ecology; Nature Conservation;
- 出版者：Springer US
- ISSN：1573-1642
- 卷排序：20
文摘
Berthing pontoons, one of the most ubiquitous structures in marinas, are known to provide recruitment substrate for a variety of marine biota but little has been reported on their capacity to support epibiotic organisms in tropical marinas, and even less is known about the factors that shape their distribution in such environments. We surveyed the epibiotic assemblages on the sides of pontoons in three Singapore marinas and examined the environmental conditions that influenced their distribution. A total of 94 taxa were recorded, with each marina hosting 43–65 taxa. Assemblages among marinas were highly distinct, and, key discriminants included components of biotic (alcyonarians, hexacorallians, bivalves, and annelids), as well as abiotic (sediment, bare area and shell fragments) origin. While the assemblage variation among marinas was influenced by local environmental conditions (e.g. water motion and sedimentation rate) and pontoon material, the variation in distribution within each marina was best explained by the distance of the pontoons from the marina’s entrance (epibiotic diversity and taxa richness were lower away from the marina entrance). Knowledge on the distribution of epibiotic assemblages on pontoons is essential to identify the factors that contribute to spatial variation and encourage the design and construction of ecologically-friendly marinas. Our findings suggest that improvements to pontoon design and layout would help to augment marina biodiversity, enhance the ecology of urbanised coasts, and mitigate development impacts.