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Geschichte ist das Geschehen in Zeit und Raum. Im weiteren Sinne umfasst sie die Erd- und die Naturgeschichte, im engeren Sinne die Menschheits-, aber auch die Wirtschafts-, Sozial-, Geistes-und Kulturgeschichte. Jede einzelne menschliche Betaetigung laesst sich geschichtlich betrachten (Geschichte der Medizin, Sprache, Literatur, Kunst). Geschichte als Wissenschaft erforscht Veranderungen methodisch, auf der Grundlage kritisch gesicherter Ueberlieferungen...
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CORKETT AND IAN A. MCLAREN Lee et al. b. (major non-volatile components) above the control concentration, had no measureable effect on zooplankton populations that were 44-91 % Pseudocalanus. Gibson and Grice (1977), again using large polyethylene enclosures in which Pseudocalanus was the predominant copepod, added concentrations of copper. 5-3 times faster than did controls. Reeve et aZ. (1977) studied rates of ingestion and production of faecal pellets by P~eudocaZ~n~s removed from these enclosures.
5 I 5OloO 5 5 Pam-Reudacalanus rpp. Acartla a m . Cantrapagas hamatus Euchaob habas Houromamma rabusta Pareuchadta narvefica Rhincalanus nasutus Plauramamma banalis Ploummamma adominah8 Phuramamma gmcilis Labidocero wllastoni Sapphirina app. 3. Histograms of A, the proportion of sampled area (vicinity of British Isles) in which the species occurred, and B, the abundance of each species during 1948-66, as revealed by the Continuous Plankton Recorder Survey. -15 3 18 CHRISTOPHER J. CORRETT AND IAN A.
Elongatus ”. Yet vertical distribution in relation to temperature stratification often figure in such publications, with animals seeming to concentrate in, over, or under thermoclines. This seems to suggest that they may choose ” not to enter warmer or colder waters even when this is well within physiological tolerances. Of course temperature is very often correlated with other variables : with salinity gradients, although these often seem slight by comparison ; with food, which may accumulate in or near thermoclines; and indeed with almost anything that varies vertically.