碩士 / 國立臺灣大學 / 漁業科學研究所 / 91 / Northeastern Taiwan coasts, by its unique geographic position, possess abundant and diverse marine bio-resources. There are abundant marine bio-resources of abalone, lobster, and sea urchin in Maoao Bay, northeastern Taiwan. In order to know the species composition, population sizes, distribution, and age of sea urchin in this area. The species and abundance of sea urchin were investigated using two-stage-survey method in this study. The gulf is divided into five sub-areas, i.e., I, II, III, IV and V according to its geological racteristics. One transect line with 100m length and 1m width in sub-area I, II, and IV as well as two transect lines in sub-area V were adopted separately at the first stage survey. Based on the results of the first stage survey, 27 transect lines on depths of 3m, 6m, and 9m contours were adopted at the second stage survey. The species, abundance, depths and photographs were recorded at each survey. Age of sea urchin was determined by the inverse relationship between oxygen isotope values and temperature.
The results of the first stage survey showed that the densities of overall species were significantly different by depths. A total 2,901 individuals of five families and 11 species were gotten under the 27 sampling lines at the second stage survey. Among them, the density of Echinostrephus aciculatus was the most one with density 88.81individuals/100m2 and that of Echinometra mathaei was the next one with density 16.33 individuals/100m2. The densities of other nine species were all less than 10 individuals/100m2. Ranking from high density to low one in order were Anthocidaris crassispina, Echinostrephus molaris, Stomopneustes variolaris, Pionocidaris baculosa, Diadema setosum, Ecuidaris metularia, Tripeustes gratilla, Echinothrix calamaris, and Diadema sevignyi. For whole area, the density of Echinostrephus aciculatus and those of other 10 species showed significant differences. The abundance of Echinostrephus aciculatus on depth of 3m was the most, that of 6m was the next, and that of 9m was lowest in sub-areas I, II, and IV, while that of 9m was the most in sub-area V. The values of species diversity indices were low on all areas and depths. The species diversity indices of whole area showed decreased trends when the densities of dominant species, Echinostrephus aciculatus, increased. They indicated that sea urchin showed diverse distributions according to sub-areas, depths, and geological characteristics in this area.
The growth directions of interambulacral ossicle were from central-cyclic growth zone to inside and outside according to the analysis of stable oxygen isotope. The age of three sea urchins (Anthocidaris crassispina) coded AC004, AC018, AC015 were estimated as 4.4 months, 4.4 months, and 1.4 months, respectively. They indicated that the growth speed of sea urchin is fast.
| Identifer | oai:union.ndltd.org:TW/091NTU00451012 |
| Date | January 2003 |
| Creators | Kao-Sung Chen, 陳高松 |
| Contributors | Ying-Chou Lee, 李英周 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 58 |
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