DOI: 10.1016/j.palaeo.2016.06.002
论文题名: Dead shell assemblages faithfully record living molluscan assemblages at One Tree Reef
作者: Martinelli J.C. ; Madin J.S. ; Kosnik M.A.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2016
卷: 457 起始页码: 158
结束页码: 169
语种: 英语
英文关键词: Carbonate lagoon
; Conservation paleobiology
; Great Barrier Reef
; Live-dead agreement
; Taphonomy
英文摘要: Reef-associated sediments accumulate over time recording the history of biological communities. The agreement between live and dead assemblages has been extensively studied, because discrepancies between the two can reveal taphonomic bias, anthropogenic impact, and/or a decrease in temporal resolution of dead assemblages to centennial scales (i.e., time averaging). Given the potential of sedimentary assemblages to provide temporal perspectives on the history of modern communities, assessments of live-dead agreement in reef mollusk assemblage composition are necessary and timely for understanding rapid environmental change. One Tree Reef (OTR) (southern Great Barrier Reef, Australia) has had very little direct anthropogenic influence over the past four decades, making it a good system for focusing on taphonomic patterns. Live (n = 1335) and dead (n = 6919) molluscan assemblages were collected from three shallow (6 m) carbonate soft-sediment lagoons. Diversity and evenness metrics indicated no significant difference between the live and dead assemblages, and dead assemblage rank order abundance explains 82% of that of the live assemblage. Differences in composition were largely due to sample size, the low probability of sampling rare species and to a lesser degree differences in skeletal durability. Taphonomic factors were responsible for less than 20% of the differences in species composition between live and dead shell assemblages. The live molluscan assemblage sampled was similar to the live assemblage sampled 30 years ago. Given that time averaging is approximately 19 years in the OTR lagoon, we conclude that the composition of the living assemblage has remained largely unchanged for the last 30 years. These findings indicate that dead assemblages preserved in shallow, fully carbonate environments primarily reflect the composition of the original source communities, making them useful to identify recent changes in coral reef areas where anthropogenic impacts are present. © 2016 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68352
Appears in Collections: 过去全球变化的重建
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作者单位: Department of Biological Sciences, Macquarie UniversityNSW, Australia; Centro de Estudios Avanzados en Zonas áridas (CEAZA), Larrondo 1281, Coquimbo, Chile
Recommended Citation:
Martinelli J.C.,Madin J.S.,Kosnik M.A.. Dead shell assemblages faithfully record living molluscan assemblages at One Tree Reef[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2016-01-01,457