| 著者 |
Hadiyanto Hadiyanto, Hendrik Alexander William Cappenberg, Ernawati Widyastuti, Indra Bayu Vimono, Dian Saptarini, Shunyang Chen, Guangcheng Chen, Yaya Ihya Ulumuddin, Frida Sidik, Udhi Eko Hernawan
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| Abstract |
The Wallace’s Line separates the biogeographic distribution of mangroves in the Indo-Pacific into the Asia and Australasia realms. However, it remains unclear whether associated fauna, including molluscs, also conform to the separation. In this study, we analysed species composition of mangrove molluscs across the Asia and Australasia realms to evaluate whether the Wallace’s Line acts as biogeographic boundary for these assemblages and identified environmental factors influencing their distribution. Molluscan species records in Indonesia were obtained from 366 publications and fieldwork in Bangka and East Java. We aggregated species records into 1°-grid cells. Environmental data (mangrove species richness, mangrove area, mangrove area changes, tidal range, sea surface temperature, salinity, air temperature, and precipitation) were obtained from the same publications of molluscan species data and online databases. Differences in species composition between the Asia and Australasia realms were analysed using permutational multivariate analysis of variance. Multivariate relationships between species composition and environmental variables were evaluated using distance-based linear model. We recorded 821 species of mangrove molluscs in Indonesia. Species composition of mangrove molluscs in the Asia realm significantly differed from that in the Australasia realm (p < 0.05), supporting the Wallace’s Line as a biogeographic boundary for these assemblages. In addition, the Asia realm tended to have more molluscan species than the Australasia realm. Mangroves species richness, mangrove area changes, salinity, air temperature, sea surface temperature, and precipitation could explain the variability of mangrove molluscs in Indonesia.
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