Settlement patterns of Chthamalus spp. at Praia da Oliveirinha (SW Portugal) |
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| Institution: | 1. KMU - Kaohsiung Medical University, Dept. of Biomedical Science and Environmental Biology, No. 100, Shin-Chuan 1st Road, KAOHSIUNG 80708, Taiwan R.O.C.;2. Department of Marine Biotechnology and Resources, National Sun Yat-sen University, No. 70, Lienhai Road, Kaohsiung 80424, Taiwan, R.O.C.;3. Institute of Marine Biology, National Taiwan Ocean University, Keelung, 20224 Taiwan R.O.C.;1. FOCUS Centre, Laboratory of Oceanology, University of Liège, Sart Tilman B6c, B-4000 Liège, Belgium;2. Marine Biology Research Group, Ghent University, Krijgslaan 281-S8, B-9000 Gent, Belgium;1. Uni Research Climate, Bjerknes Centre for Climate Research, Bergen, Norway;2. Faroe Marine Research Institute, Box 3051, FO-110 Tórshavn, Faroe Islands |
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| Abstract: | Recruitment of Chthamalus spp. is intense during spring and summer but the number of settled cypris larvae is very low when compared to the high number of Chthamalus spp. metamorphs. In the summer of 1997 at Praia da Oliveirinha (SW Portugal), two hypotheses were tested: 1) the cypris larvae of Chthamalus spp. metamorphose in one tidal cycle; and 2) the settlement of Chthamalus spp. is higher during diurnal high tide compared with nocturnal high tide. The results indicate that cypris larvae of Chthamalus spp. can metamorphose in one tidal cycle. The hypothesis of higher settlement during diurnal high tide could not be tested at the mid and upper levels of C. montagui distribution due to a significative heterogeneity of variances. At the lower level, the results support this hypothesis. In spite of these data having been collected on a single shore and on a few sampling dates, these results suggest that more studies using different spatial and temporal scales are needed to see if this pattern is general. |
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