气候变化领域集成服务门户(CCPortal): Palaeoecology of Macaronichnus segregatis degiberti: Reconstructing the infaunal lives of the travisiid polychaetes

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DOI	10.1016/j.palaeo.2018.12.011
	Palaeoecology of Macaronichnus segregatis degiberti: Reconstructing the infaunal lives of the travisiid polychaetes
	Nara M.; Seike K.
发表日期	2019
ISSN	0031-0182
起始页码	284
结束页码	294
卷号	516
英文摘要	Macaronichnus segregatis degiberti, a relatively large ichnosubspecies of Macaronichnus segregatis, is an almost straight to gently curved, cylindrical, fossilized burrow, oriented horizontal to oblique to the bedding plane. It is interpreted as a pascichnial trace fossil formed through selective sand feeding and excretion of a free-living polychaete, such as a relatively large travisiid (formerly classified as opheliid or scalibregmatid) polychaete Travisia. While the other ichnosubspecies, i.e., M. s. segregatis, M. s. lineiformins, M. s. meandriformis, and M. s. spiriformis, are commonly 2–5 mm in diameter and occur exclusively in foreshore deposits, M. s. degiberti attains a diameter of up to 15 mm and shows wide environmental distribution, ranging from tidal channels, tidal sand bars, tidal sandridges, tidal flats, upper to lower shorefaces, bioturbated sandy shelves, shelf storm-sheets, to shelf sand ridges. The core of M. s. degiberti, consisting mainly of light mineral-rich sand grains, is composed of alternating lamellae of light mineral-rich and heavy mineral-rich sands, arranged oblique to the bedding plane. On the other hand, the mantle, composed mainly of heavy mineral-rich sands, has a smooth outline, or evenly spaced lobes flanked on both sides. The morphology of the mantle lobes and core lamellae suggests repeated pulses of sediment probing and excreting behaviour of the tracemaker. Two or more burrows of this ichnosubspecies tend to occur adjacently, sometimes intertwining. As Travisia develops directly, lacking any planktic larval stages, aggregations of the burrows can be interpreted to reflect the burrowers’ interindividual exploratory behaviour with the aim of copulation. Travisia, also known as a “stink worm” secretes volatile chemical substances that might act as sex pheromones to attract other individuals for reproduction within the substrate. Therefore, a new category of ethological classification of trace fossils “sequorichnia” (sequor, follow; and ichnia, traces), for exploration of other individuals, is proposed here. This is the first record of interindividual exploratory behaviour of infaunae. © 2018 Elsevier B.V.
英文关键词	Ethology; Exploration; Interindividual behaviour; Macaronichnus segregatis degiberti; Travisia
语种	英语
scopus关键词	feeding; morphology; paleoecology; polychaete; reproduction; sex pheromone; subspecies; trace fossil; volatile organic compound; Opheliidae; Polychaeta; Scalibregmatidae; Travisia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151089
作者单位	Department of Biological Sciences, Kochi University, 2-5-1 Akebono-choKochi 780-8520, Japan; Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Central 7, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8567, Japan
推荐引用方式 GB/T 7714	Nara M.,Seike K.. Palaeoecology of Macaronichnus segregatis degiberti: Reconstructing the infaunal lives of the travisiid polychaetes[J],2019,516.
APA	Nara M.,&Seike K..(2019).Palaeoecology of Macaronichnus segregatis degiberti: Reconstructing the infaunal lives of the travisiid polychaetes.Palaeogeography, Palaeoclimatology, Palaeoecology,516.
MLA	Nara M.,et al."Palaeoecology of Macaronichnus segregatis degiberti: Reconstructing the infaunal lives of the travisiid polychaetes".Palaeogeography, Palaeoclimatology, Palaeoecology 516(2019).