Comparison of Habitat Environment and Trophic Level for the Whale and Megamouth Sharks

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基本資料

Project title

Code/計畫編號

MOST104-2313-B019-002

Translated Name/計畫中文名

鯨鯊及巨口鯊棲地環境及營養位階比較之研究

Project Coordinator/計畫主持人

Shoou-Jeng Joung

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Environmental Biology and Fisheries Science

Year

2015

Start date/計畫起

01-08-2015

Expected Completion/計畫迄

01-07-2016

Bugetid/研究經費

700千元

ResearchField/研究領域

自然生態保育

"鯨鯊（Rhincodon typus）及巨口鯊（Megachasma pelagios）為世界上三種濾食性鯊魚中的其中兩種。鯨鯊為泛世界性的魚種，20 年來在台灣從過去被大量漁獲利用到加以管理至今已完全保育，已完成一些包括生物學及洄游移動的初步研究，但是對其不同生活史階段及不同性別的食性還有棲息環境仍有許多未解之謎。巨口鯊為稀有的大型鯊魚，至今全世界僅記錄了95 尾，但台灣就佔了一半，在2013-2014 年間更大量捕獲了32 尾個體，其主要原因為何尚不得而知。本研究將利用過去及未來所蒐集鯨鯊、巨口鯊之胃內容物、肌肉、脊椎骨樣本進行穩定性同位素分析，並配合水文資料及漁獲資訊的調查，加以比較此兩種大型濾食性鯊魚的攝食生態與營養位階的不同，進而探討其棲地分配利用的差異以及在不同海洋環境下的適應。研究成果將可於未來提供鯨鯊飼育業者、生態旅遊發展單位更深入瞭解鯨鯊生態，讓鯨鯊獲得更妥善地對待，另外也可用於巨口鯊進一步管理及保育的參考依據。" "The whale shark (Rhincodon typus) and the megamouth shark (Megachasma pelagios) are two of three filter-feeding shark species in the world. The whale shark is a circum-globe shark species, and was captured numerously in the before. This species was managed and protected by now during recent two decades in Taiwan. Some preliminary studies including biology and migration/movement were investigated, however, there are mysteries which exist in feeding habits and habitat environments in different life history stages and sexes. The megamouth shark is a rare and large shark species. There were only 95 individual recorded by now, and about 50% of them were caught in Taiwan waters. There were even 32 specimens caught during 2013-2014 off Taiwan, and the main reason is still unknown. Stable isotope analysis will be studied based on stomach contents, muscle tissues, and vertebrae collected before and in the future. In addition, hydrological data and fisheries information will be also investigated. This study will compare differences of feeding ecology and trophic level between these two large filter-feeding sharks, and further to discuss habitat partition, utilization, and adaption in various marine environments. Research results will provide for whale shark husbandry and ecotourism operators to realize whale sharks ecology, and make them be treated better, additionally, also be used as important reference for further management or conservation."

DSpace CRIS

Comparison of Habitat Environment and Trophic Level for the Whale and Megamouth Sharks

基本資料

Description