EVIDENCE OF SEASONAL AND GEOGRAPHICAL VARIATIONS IN ZOANTHUS PACIFICUS AND ITS ENDOSYMBIOTIC ZOOXANTHELLAE DUE TO ENVIRONMENTAL FACTORS
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概要
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Despite much progress, many questions regarding coral bleaching in cnidarians are still unanswered. One specific phenomenon that has received little attention thus far is the variability and change in zooxanthellae body types due to environmental changes. Our previous studies have shown that zooxanthellae are strongly affected by abnormal light and especially, abnormally high seawater temperatures. However, all previous research has been conducted in the lab, with samples from only one site. Confirmation of these hypotheses in the field from multiple sites would go a long way in helping solidify our previous theories, and shed light on other aspects of the cnidarian-zooxanthellae symbiosis.To accomplish this samples of the encrusting anemone Zoanthus pacificus were collected each month from four field sites (Kokubu-Wakamiko (K), Sakurajima-Hakamagoshi (S), Yakushima-Kurio (Y), and Amami-Oshima-Kasari (A)). Immediately after sampling, endosymbiotic zooxanthellaewere isolated from each sample and examined under a microscope using a hemocytometer, and classified by body type. % cover transect data was also collected. Initial (15 month results) show that the sites can be divided into Northern (K and S) and Southern (Y and A) Groups. The Northern Group shows little decrease in NZ during summer, but a significant drop in NZ during the winter months while the Southern Group displays an NZ decrease in hot summer months, and either no drop (A) or a slight drop (Y) in NZ during winter. (A) shows no drop in NZ ratios during winter, and (Y) shows a decrease in NZ (although not as dramatic as K or S). These results indicate that seawater minimum and maximum temperatures approach 17℃ and 30℃, respectively, based on temperature readings taken from the field sites. This is supported by the transect data, which shows a marked decrease in % Zoanthus cover over winter at Y but not at A. Additionally, Zoanthus appears to be able to withstand short-term (up to 6 hours) intertidal temperatures ranging from 13℃ to 37℃.SECTION TWO: PHYSICAL GEOGRAPHY: Report 1
- 鹿児島大学,カゴシマ ダイガク,Kagoshima Universityの論文
- 2003-02-28
著者
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Reimer J
Research Program For Marine Biology And Ecology Extremobiosphere Research Center Japan Agency For Ma
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ONO Shusuke
Miyakonojo Higashi High School
関連論文
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- EVIDENCE OF SEASONAL AND GEOGRAPHICAL VARIATIONS IN ZOANTHUS PACIFICUS AND ITS ENDOSYMBIOTIC ZOOXANTHELLAE DUE TO ENVIRONMENTAL FACTORS
- Molecular evidence suggesting interspecific hybridization in Zoanthus spp. (Anthozoa: Hexacorallia)
- Seasonal Changes in Morphological Condition of Symbotic Dinoflagellates (Symbiodinium spp.) in Zoanthus sansibaricus (Anthozoa: Hexacorallia) in Southern Japan
- Latitudinal and intracolony ITS-rDNA sequence variation in the symbiotic dinoflagellate genus Symbiodinium (Dinophyceae) in Zoanthus sansibaricus (Anthozoa : Hexacorallia)
- Seasonal Changes in Zoanthus spp. in the Infra-Littoral Zone at Taisho Lava Field, Sakurajima, Kagoshima, Japan
- Distribution of zooxanthellate zoanthid species (Zoantharia: Anthozoa: Hexacorallia) in southern Japan limited by cold temperatures