Laboratory experiments in the ecological work on rockpool animals with special notes on the ostracod Heterocypris salinus
Ganning, B. (1967). Laboratory experiments in the ecological work on rockpool animals with special notes on the ostracod Heterocypris salinus. Helgol. Wiss. Meeresunters. 15(1-4): 27-40. https://dx.doi.org/10.1007/BF01618607
In: Helgoländer Wissenschaftliche Meeresuntersuchungen. Biologische Anstalt Helgoland: Hamburg. ISSN 0017-9957, more
Also appears in:Kinne, O.; Aurich, H. (Ed.) (1967). Vorträge und Diskussionen. Erstes Europäisches Symposion über Meeresbiologie = Papers and discussions. First European Symposium on Marine Biology = Rapports et discussions. Premier symposium européen sur biologie marine. Helgoländer Wissenschaftliche Meeresuntersuchungen, 15(1-4). Biologische Anstalt Helgoland: Hamburg. 669 pp., more
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| Abstract |
1. The relations between environment and fauna of rockpools are briefly discussed on the basis of information available in literature.2. The necessity of combining field studies and laboratory experiments, as well as the need to know the extreme physico-chemical values of the environment for pertinent experimentation, is stressed.3. Rockpool organisms are exposed to extreme conditions and diurnal fluctuation of salinity, temperature, pH, oxygen concentration and illuminance; with the exception of salinity, all these factors vary greatly especially during a sunny day.4. Many rockpool organisms exhibit diurnal vertical migrations; this is demonstrated quantitatively for the ostracodHeterocypris salinus Brady, which is found in the shallow parts of the pools at night and in the deep parts during the daytime.5. In laboratory experimentsH. salinus is shown to be negatively phototactic.6.H. salinus survives better in hypo- than in hyperoxygenated (or in 100% aerated) water but does not respond to alternatives offering hypo- and hypersaturation.7.H. salinus shows a well defined reaction to different temperatures with a preference for 15° C when the alternative is 22° C.8. The investigated populations ofH. salinus andGammarus duebeni exhibit definite preferences for the most common rockpool salinity, 6 permil, which is also found in the surrounding sea.9. The possible influences of light, oxygen, carbon dioxide and temperature combinations and variations on the diurnal distribution of rockpool organisms are discussed. |
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