Predation scar frequencies in chemosymbiotic bivalves at an Oligocene seep deposit and their potential relation to inferred sulfide tolerances
Predation scar frequencies in chemosymbiotic bivalves at an Oligocene seep deposit and their potential relation to inferred sulfide tolerances
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DOI：
10.1016/j.palaeo.2016.04.026
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发表时间：
2016-07-01
影响因子：
3
通讯作者：
Jenkins, Robert G.
中科院分区：
文献类型：
--
作者：
Kiel, Steffen;Amano, Kazutaka;Jenkins, Robert G.
对日本北海道东部渐新世下段渗漏存款中的三种具有不同硫化物耐受性和生活习性的化学共生双壳类的钻孔和硬食性捕食疤痕进行了研究。的thyasirid贝壳bisecta具有最低的推断硫化物的耐受性，并表现出最高的频率的修复（0.4）和钻孔捕食（0.1），钻孔标本平均小于非钻孔标本，表明大尺寸是从钻捕食在这个物种的避难所。因此，推测深足线虫Bathymodiolus inouei和泡虫Hubertschenckia ezoensis生活在比C.根据与其活着的亲属的比较，显示出较低的修复频率（B为0.24）。inouei和H. ezoensis）。假设硫化物浓度的增加对捕食者的毒性越来越大，我们的结论是，在三个调查物种的壳损伤的频率是负相关的硫化物浓度，这些物种能够容忍。因此，当仔细应用时，在化石渗漏处有壳无脊椎动物中壳损伤的频率可以用来推断它们对硫化物的相对耐受性，因此可以代表一种工具来评估在地质学过去居住在甲烷渗漏处的灭绝无脊椎动物的生活习性。(C)2016爱思唯尔B.V.保留所有权利。
Three species of chemosymbiotic bivalves with different inferred sulfide tolerances and life habits from a lower Oligocene seep deposit in eastern Hokkaido, Japan, were investigated for drill holes and scars of durophagous predation. The thyasirid Conchocele bisecta had the lowest inferred sulfide tolerance and showed the highest frequencies of repair (0.4) and drilling predation (0.1), and specimens with drill holes were on average smaller than non-drilled specimens, indicating that large size is a refuge from drilling predation in this species. The bathymodiolin Bathymodiolus inouei and the vesicomyid Hubertschenckia ezoensis are inferred to have lived at higher sulfide concentrations than C. bisecta based on comparisons to their living relatives, and show lower repair frequencies (0.24 in B. inouei and 0.17 in H. ezoensis). Based on the assumption that increased sulfide concentrations are increasingly toxic to predators, we conclude that the frequency of shell injuries in the three investigated species is inversely related to the sulfide concentrations that these species are able to tolerate. Thus when applied carefully, the frequency of shell injuries among shelled invertebrates at fossil seeps may be used to infer their relative tolerances toward sulfide, and may thus represent a tool to assess the life habits of extinct invertebrates that inhabited methane seeps in the geologic past. (C) 2016 Elsevier B.V. All rights reserved.