| 翻訳と辞書 |
| Soft-bodied organism ： ウィキペディア英語版 |
Soft-bodied organism
Soft-bodied organisms are animals that lack skeletons, a group roughly corresponding to the group Vermes as proposed by Carl von Linné. All animals have muscles but, since muscles can only pull, never push, a number of animals have developed hard parts that the muscles can pull on, commonly called skeletons. Such skeletons may be internal, as in vertebrates, or external, like in arthropods. However, a large number of animals groups do very well without hard parts.〔Ruppert, E.E., Fox, R.S., & Barnes, R.D. (2004): Invertebrate Zoology (7 ed.). Brooks / Cole. ISBN 0-03-025982-7〕 This include animals like earthworms, jellyfish, tapeworms, squids and an enormous variety of animals from almost every part of the kingdom Animalia.
== Commonality ==
Most soft-bodied animals are small, but they do make up the majority of the animal biomass. If we were to weigh up all animals on Earth with hard parts against soft-bodied ones, estimates indicate that the biomass of soft-bodied animals would be at least twice that of animals with hard parts, quite possibly much larger.〔Greenstreet S, Robinson L, Reiss H, Craeymeersch J, Callaway R, Goffin A, Jørgensen L, Robertson M, Kröncke I, de Boois I, Jacob N, Lancaster J, (2007): (Species composition, diversity, biomass and production of the benthic invertebrate community of the North Sea ). ''Fisheries Research Services Collaborative Report'' No 10 (2007): 67 pp.〕 Particularly the roundworms are extremely numerous. The nematodologist Nathan Cobb described the ubiquitous presence of nematodes on Earth as follows:
"In short, if all the matter in the universe except the nematodes were swept away, our world would still be dimly recognizable, and if, as disembodied spirits, we could then investigate it, we should find its mountains, hills, vales, rivers, lakes, and oceans represented by a film of nematodes. The location of towns would be decipherable, since for every massing of human beings there would be a corresponding massing of certain nematodes. Trees would still stand in ghostly rows representing our streets and highways. The location of the various plants and animals would still be decipherable, and, had we sufficient knowledge, in many cases even their species could be determined by an examination of their erstwhile nematode parasites."〔Cobb, N.A. (1914, p. 472) Nematodes and their relationships. Yearbook United States Department Agriculture, 1914, 457-490. http://naldr.nal.usda.gov/NALWeb/Agricola_Link.asp?Accession=IND43748196〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Soft-bodied organism」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|