- Subtidal Ecology — Particularly As Studied By Diving Techniques
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Quantitative sampling of benthic organisms by diving on the Swedish west coast
Quantitative Erfassung benthischer Organismen mit Hilfe der Tauchtechnik an der schwedischen Westküste
Helgoländer wissenschaftliche Meeresuntersuchungen volume 15, pages 455–459 (1967)
Kurzfassung
DurchGislén (1929–1930) wurde eine umfassende ökologische Untersuchung der Epibiosen im Gullmar-Fjord an der schwedischen Skagerrak-Küste vorgenommen. Anhand zahlreicher Probenetnahmen durch einen Taucher wurde der Organismenbestand qualitativ und quantitativ untersucht. Im gleichen Gebiet wurden 40 Jahre später Vergleichsuntersuchungen durchgeführt, um Veränderungen in der Zusammensetzung und Verteilung der Biozönosen zu ermitteln. Parallele und divergierende Befunde hinsichtlich der Artenzusammensetzung der benthonischen Lebensgemeinschaften werden gegenübergestellt und diskutiert.
Summary
1. In the Gullmar Fjord (west coast of Sweden) bottom test squares had been sampled 40 years ago byGislén (1929–30). Studying the same squares in 1966, using skin diving equipment, has led to different results in regard to the fauna and flora found.
2. If the old records are compared with a number of new ones, obtained from the same place and depth, the degree of variation encountered in the new samples may serve as indicator for assessing true differences between biocoenoses in 1926 and 1966.
3. Differences between adjacent test squares depend mainly on the slope of the rock. Other factors which may affect the community structure over short distances are direction and light.
4. Certain organisms settle on bottom areas where calm waters allow sedimentation.
5. Increasing pollution demands sufficient and extensive registration of the actual situation in order to allow for comparisons. For this purpose even a lot of scattered observations can never be equal to numerous data from each of a few chosen places, which are representing the main trends in the sea bottom mosaic.
Literature cited
Gislén, T., 1929/30. Epibioses of the Gullmar Fjord. Pt 1. Geomorphology and hydrography.2. Marine sociology. (Kristinebergs Zoologiska Station, 1877–1927).SkrSer. K. svenska Vetensk Akad. 1929 (3), 1–123;1930 (4), 1–380.
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Michanek, G. Quantitative sampling of benthic organisms by diving on the Swedish west coast. Helgolander Wiss. Meeresunters 15, 455–459 (1967). https://doi.org/10.1007/BF01618641
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DOI: https://doi.org/10.1007/BF01618641