Abstract
Re-examination of ine structure of postlarvae previously identified as the abyssal species Ophiura ljungmani (Lyman) in a time series of samples taken from 1975 to 1980 from a 2900 m deep permanent station in the southern Rockall Trough (Northeast Atlantic Ocean) has shown the majority of the large summertime peak of brittle-star postlarvae to belong to a second species. Most were incomplete and probably corpses when collected. The few intact specimens present were identical to postlarvae collected in benthic samples from the neighbouring continental slope, where a dense population of the bathyal species Ophiocten gracilis (G. O. Sars) is present from 600 to 1 200 m depth. Examination of population size-structures indicates synchronous reproduction in January/February and annual recruitment to the population. The presence both of “Ophiopluteus ramosus” and intact postlarvae of Ophiocten gracilis in midwater plankton samples from the vicinity of the permanent station in March/April are thought to derive either from the adjacent slope population or, less probably, from larvae transported in the North Atlantic Current from the Flemish Cap area off Newfoundland. In deep water, viability of these benthic postlarvae is low, none surviving longer than the following winter in the Rockall Trough. These observations suggest a large seasonal transfer from the slope of non-viable larvae and postlarvae as food to the abyssal benthic community.
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Literature Cited
Bailey, R. S.: The population biology of blue whiting in the North Atlantic. Adv. mar. Biol. (In press)
Baker, A. C., M. R. Clarke and R. J. Harris: The N.I.O. combination net (RMT1+8) and further developments of rectangular midwater trawls. J. mar. biol. Ass. U.K. 53, 167–184 (1973)
Bouchet, P.: Mise en évidence de stades larvaires planktoniques chez des gastéropodes prosobranches des étages bathyal et abyssal. Bull. Mus. natn. Hist. nat., Paris (Sect. Zool., fasc. 277) 400, 947–972 (1976)
Crisp, D. J.: Energy relations of marine invertebrate larvae. Thalassia jugosl, 10, 103–120 (1974)
Dietrich, G.: Atlas of the hydrography of the northern North Atlantic Ocean, 140 pp. Charlottenlund, Denmark: Conseil International pour l'Exploration de la Mer, Service Hydrographique 1969
Ellett, D. J.: Some oceanographic features of Hebridean waters. Proc. R. Soc. Edinb. (Sect. B) 77, 61–74 (1979)
Ellett, D. J. and J. H. A. Martin: The physical and chemical oceanography of the Rockall Channel. Deep-Sea Res. 20, 585–625 (1973)
Gage, J. D.: Structure of the abyssal macrobenthic community in the Rockall Trough. In: Biology of benthic organisms, pp 247–260 Ed. by B. F. Keegan, P. O'Ceidigh and P. J. S. Boaden. Oxford: Pergamon Press 1977
Gage, J. D.: Macrobenthic community structure in the Rockall Trough. Ambio. spec. Rep. 6, 43–46 (1979)
Gage J. D., R. H. Lightfoot, M. Pearson and P. A. Tyler: An introduction to a sample time-series of abyssal macrobenthos: methods and principal sources of variability. Oceanol. Acta 3, 169–176 (1980)
Gage, J. D. and P. A. Tyler: Re-appraisal of age composition, growth and survivorship of the deep-sea brittel star Ophiura ljungmani from size structure in a sample time series from the Rockall Trough. Mar. Biol. 64, 163–172 (1981)
Geiger, S. R.: Ophiopluteus ramosus between Iceland and Newfoundland. Nature, Lond. 198, 908–909 (1963)
Geiger, S. R.: Echinodermata: larvae classes: Ophiuroidea and Echinoidea (plutei). Fich. Ident. Zooplancton. Sheet 105, 1–5 (1964)
Hendler, G.: Adaptational significance of the patterns of ophiuroid development. Am. Zool. 15, 691–715 (1975)
Hessler, R. R. and H. L. Sanders: Faunal diversity in the deep-sea. Deep-Sea Res. 14, 65–78 (1967)
Hill, H. W.: Hydrographic observations at Rockall during April–May 1969. Fish. Res. Tech. Rep. Minist. Agric. Fish. Fd, Directorate Fish. Res., Lowestoft, Suffolk 24, 1–27 (1976)
Kawaguchi, K. and J. Mauchline: The biology of myctophid fishes (family Myctophidae) in the Rockall Trough, northeastern Atlantic Ocean. Biol. Oceanogr. (In press)
Laubier, L. and M. Sibuet: Ecology of the benthic communities of the deep North East Atlantic. Ambio spec. Rep. 6, 37–42 (1979)
Lee, A. J.: Oceanic circulation of the North Atlantic region. In: Sea fisheries research, pp 1–30. Ed. by F. R. Harden Jones. London: Elek Science 1974
Lemche, H.: Northern and arctic tectibranch gastropods I–II. Biol. Skr. 3, 1–136 (1948)
Lightfoot, R. H., P. A. Tyler and J. D. Gage: Seasonal reproduction in deep-sea bivalves and brittlestars. Deep-Sea Res. 26A, 967–973 (1979)
Lutz, R. A., D. Jablonnski, D. C. Rhoads and R. D. Turner: Larval dispersal of a deep-sea hydrothermal vent bivalve from the Galápagos Rift. Mar. Biol. 57, 127–133 (1980)
Mileikovsky, S. A.: Character and nature of deep-sea populations of eurybathic forms of invertebrates with pelagic larvae, taking as an example the polychaete Euphrosyne borealis Oersted 1843 from the North Atlantic. Okeanologija, Mosk. 1, 679–687 (1961). [In Russ. English translation in Deep-Sea Res. 9, 531–527 (1962)]
Mileikovsky, S. A.: Some common features in the drift of pelagic larvae and juvenile stages of bottom invertebrates with marine currents in temperate regions. Sarsia 34, 209–216 (1968)
Mileikovsky, S. A.: Types of larval development in marine bottom invertebrates, their distribution and ecological significance: a re-evaluation. Mar. Biol. 10, 193–213 (1971)
Mortensen, T.: Die Echinodermlarven der Plankton Expedition. Ergeb. Atlant. Ozean Planktonexped. Humboldt-Stift. II, 1–120 (1898)
Olsen, H.: A short report on some Ophioplutei. Bergens Mus. Arb. 1942 (Naturvidens. rek 4), 1–8 (1943)
Pearse, J. A.: Reproductive periodicities in several contrasting populations of Odontaster validus Koehler, a common Antarctic asteroid, Biology of the Antarctic Seas II. Antarctic Res. Ser. 5, 39–85 (1965)
Scheltema, R. S.: Evidence for trans-Atlantic transport of gastropod larvae belonging to genus Cymatium. Deep-Sea Res. 13, 83–95 (1966)
Semenova, T. N., S. A. Mileikovsky, and K. N. Nesis: The morphology, distribution and seasonal incidence of the ophiuroid larva Ophiocten sericeum (Forbes) S.L. in the North-West Atlantic, Norwegian Sea and Barents Sea plankton [In Russ.] Okeanologija, Mosk. 4, 669–683 (1964)
Strathmann, R. R., E. S. Branscomb and K. Vedder: Fatal errors in set as a cost of dispersal and the influence of intertidal flora on set of barnacles. Oecologia (Berl.) (In press). (1981)
Sumich, J. L. and J. E. McCauley: Growth of a sea urchin, Allocentrotus fragilis, off the Oregon coast. Pacif. Sci. 27, 156–167 (1973)
Thorson, G.: Reproductive and larval ecology of marine bottom invertebrates. Biol. Rev. 25, 1–45 (1950)
Thorson, G.: Length of pelagic life in marine invertebrates as related to larval transport by ocean currents. Publs Am. Ass. Advmt Sci. 67, 455–474 (1961)
Thorson, G.: Some factors influencing the recruitment and establishment of marine benthic communities. Neth. J. Sea Res. 3, 267–293 (1966)
Tulloch, D. S. and J. B. Tait: Hydrography of the north-western approaches to the British Isles. Mar. Res. 1959 (1), 1–32 (1959)
Tyler, P. A. and J. D. Gage: Reproductive ecology of deep sea ophiuroids from the Rockall Trough. In: Cyclic phenomena in marine plants and animals. pp 215–222. Ed. by E. Naylor and R. G. Hartnoll. Oxford: Pergamon Press 1979
Tyler, P. A. and J. D. Gage: Reproduction and growth of the deep-sea brittlestar Ophiura ljungmani (Lyman). Oceanol. Acta 3, 177–185 (1980)
Tyler, P. A., G. L. J. Paterson and J. D. Gage: The systematics and zoogeography of the genus Ophiocten (Echinodermata: Ophiuroidea) in the North Atlantic Ocean. Bull. Br. Mus. nat. Hist. (Ser. D) (In press)
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Communicated by J. Mauchline, Oban
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Gage, J.D., Tyler, P.A. Non-viable seasonal settlement of larvae of the upper bathyal brittle star Ophiocten gracilis in the Rockall Trough abyssal. Mar. Biol. 64, 153–161 (1981). https://doi.org/10.1007/BF00397104
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DOI: https://doi.org/10.1007/BF00397104