Further Investigations of Fishery Resources and Its Precaution System Related to Cold Water Intrusion in Penghu Waters

View Statistics Email Alert RSS Feed

Information

Details

Project title

Code/計畫編號

99農科-8.5.2-漁-F1(4)

Translated Name/計畫中文名

澎湖寒害對漁業之衝擊後續監測及預警體制之建立

Project Coordinator/計畫主持人

Ming-An Lee

Funding Organization/主管機關

Council of Agriculture,Executive Yuan

Co-Investigator(s)/共同執行人

曾建璋
邵廣昭
詹滿色
羅耀財
鄭明修
李國添
徐振豐
邱郁文

Department/Unit

College of Life Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=2086616

Year

2010

Start date/計畫起

01-03-2010

Expected Completion/計畫迄

31-12-2010

Bugetid/研究經費

5200千元

ResearchField/研究領域

漁業

" 在黑水溝與雲彰隆起之天然屏障下，澎湖水域形成特有之海洋生態系。97年2月8日起澎湖海域因寒潮入侵陸續發現死亡魚類，表水溫13℃上下，各島嶼四周海灘布滿了魚屍，是澎湖幾十年來最嚴重的一次災害，此一現象應是低溫、低鹽、高混濁度大陸沿岸水入侵有以致之，而且從1月底開始至2月底，持續時間頗長，所以高混濁度之低溫沿岸水可能掩埋珊瑚礁之共生藻，也足以使冷血動物的珊瑚礁區水生動物死亡，即使洄游性魚類也將因臺灣灘太淺，冷水範圍太大，無法逃避而受難。據估計沿近海漁業生物的損失可達70公噸以上，漁業經濟損失亦有3.5億元以上，2008年3月間業已整合國內專家學者探討其成因及對海洋生態的衝擊與因應之道。有鑑於寒害對海洋生物資源與生態的衝擊非短期可調查清楚，並研擬因應之道，故本計畫擬再次邀請原有團隊-中央研究院、臺灣海洋大學、台灣大學及澎湖科技大學等海洋生物資源等專家學者共同持續探討與比對澎湖寒害後之環境因子及基礎生產力、澎湖海域漁業資源現況及澎湖海域寒害預警通報系統之建置與因應措施之研擬。主要工作要項如下:(1)環境因子、基礎生產力調查與冷水入侵預警模式之建立：利用衛星水溫與水色資訊持續追蹤監測寒災後之長期水文環境特性，並進行相關追蹤，並配合生物採樣了解仔稚魚群聚及浮游動物組成結構。 (2)潮間帶生物資源調查：1.整合以往澎湖海域調查樣區之研究結果及本次研究之生物相及生態資料。2.了解澎湖北海、南海及內海潮間帶生物受2008年1、2月份寒害後生物相之改變及後續之影響。3.提供作為潮間帶生態環境受到改變後對未來漁業資源影響評估之參考。 (3)無脊椎生物資源調查：建立澎湖海域無脊椎動物（軟體動物、節肢動物與棘皮動物）生物相與豐富度的復原情形，評估具有代表性的測站與樣區，並完成固定樣區的珊瑚覆蓋率調查；另外，增加海水溫度的長期記錄，於固定樣區內放置溫度記錄器，進行測站樣區海水溫度的全年記錄，未來若有劇烈環境變化，可以有較完整的背景資料。另外針對經濟性的無脊椎動物種類，配合這一年來生物群聚的變動，若發現有多種物種族群大量發生的情形，將進行更深入的討論，可以做為管理單位未來的參考依據。 (4)a.魚類資源調查1.了解澎湖海域在寒災一年後珊瑚礁魚類群聚恢復的現狀2.整理過去漁獲資料，探討及比較寒災前後經高濟價值魚類的效應變化，以作為未來再遭遇寒災的因應策酪。3.配合珊瑚、無脊椎及藻類等棲地或餌料生物資料，從生態系及食物鏈之角度來了解整個生態系回復之狀況。b.漁業資源調查：透過蒐集並分析漁獲資料，整理出每次作業漁獲之魚種及漁獲量，用以探討及比較寒災前後經高濟價值魚類的產量及資源變化，以作為未來再遭遇寒災的因應策略。 c.漁業經濟調查：探討氣候變遷(寒害) 對澎湖地區漁業經濟的影響。5.水文模式建立：大尺度海洋環境因子蒐集、分析及冷水入侵預警制度之建立。"" In February, 2008, massive marine fishes were killed due to the passage of cold front at northern Penghu Island. The bodies of dead fish spread out on coastlines and beaches of many islets and the incidence became the most serious event in Penghu over the last few decades. The satellite-derived sea surface temperature (SST) data in the winters of 1996-2008 were used to examine the exceptional intrusion of China Coastal Current into the Taiwan Strait. The monthly SST differences in January and February 2008 were about 5°C higher and 7°C lower than those of the 12-year average, respectively. The satellite data showed that the China Coastal Current intruded from the north of Chang-Yuen Ridge into the waters surrounding the Peng-Hu Islands, while wind speed of more than 6.7 m/s was lasting for 30 days in the same period. The exceptional intrusion resulted in the minimum SST of 12.6°C on 16 February, 7.8°C lower than the 12-year average of February (20.4°C). The higher SST (＆gt;18°C) appeared after 21 February, an indication of the northward recession of the cold water. It was emphasized that the China Coastal Current intruded to as far south as the water around Peng-Hu Islands from 15 to 21 February. Our monitoring results on the part of coral fishes showed that the worst areas were all in northern main island of Penghu whereas the damages in southern part of waters were quite slight. In southern part, there is a cut line along the islets of Tung-Yu-Ping and Shi-Yu-Ping. The northern part of this line suffered some minor damages while southern waters suffered almost no damage at all. Till present, this disaster has been one year long. It is worthwhile to investigate it again now to see how the reef fish community and population have been recovered and their recruitment status.Thus this study was tried to invite the experts of fishery environment, fishery resources and ecology for investigating the fishery resouces as the exceptional cold water intrusion happened one year later. The major items of this project included the investigation of marine environement and primary production, the biomes of intertidal zone and fishery resouces (i.e. invertrate and fishes) in the coastal waters of Peng-Hu. The content and method was similar to that of 2008 investigation which is following: 1. to choose various habitats alone the intertidal zones or coastal waters of Penghu as the sampling areas. 2. To make the species investigation in the marine environment zones selected. 3. To discuss the relationship between biota and habitats. 4. To compare and analyze the change of biotic community after the damage of cold current. 5. To discuss the effect of damage of organism brought by cold current on fishery resource. This study chooses Wukan, Longmen, Hejie, northern part of Houliao, and northern part of Jibei where were investigated after cold current last year as the major sampling areas for this year. The investigation is planned to make monthly from April to November. The purpose is to investigate fish, invertebrate, and algae appeared in various intertidal zones and coastal waters. The data will be analyzed to get the number of species. The richness will be analyzed by Margalef’s Index, Dm. The dominance and evenness will be analyzed by Pielou’s evenness Index, J. The diversity will be analyzed by Simpson’s Index, λ. The similarity will be analyzed by Jaccard’s Index, Jc. Performance Expectation: (1) To monitor the marine environment including the sea surface temperature and chl-a pigment concentration by using the remote sensing and in field nar-real time system. (2) 1. To fully understand the species appearance at certain intertidal zone. 2. Compared with last year, we can find the changes of biota after the cold current occurred in January and February, 2008. 3. To discuss the effects of habitat post cold current on organism. 4. The result can be the reference to the effect of intertidal zone with mass productivity after environmentally changed on fishery resource in the future. (3) This is not the first time of the chilling injury in the Penghu, and such event may more frequently occur because the degree of global warming is more serious, and the amplitude of global temperature is larger.To synthesize the results after two years, it is commented that it is necessary to establish the marine protected area ( MPA) in the south Penghu which is slightly affected by this chilling injury, and it may have the ability to maintain high biodiversity in the Penghu. The establishment of marine protected area could be helpful to the sustainable use of the marine resources. (4) a. 1. Understand the resilience of reef fish community. 2. Based on the population fluctuation data, to access the population and community change of reef fishes. 3. Try to explore the economic effect before and after the massive kill in order to provide the background data for the mitigation plan when this kind of disaster happens again in the future b. Try to explore the economic effect before and after the massive kill in order to provide the background data for the mitigation plan when this kind of disaster happens again in the future. c.. The fishery economic survey may analysis the impact of climate change and its damage on Penghu fishery economic. (5) To set up hydrologic model. "

Keyword(s)

漁業災害
寒害
澎湖群島
漁業資源
Fishery disaster
chill event
Penghu Archipelago
fishery resource

DSpace CRIS

Further Investigations of Fishery Resources and Its Precaution System Related to Cold Water Intrusion in Penghu Waters

Details

Description