Movement Pattern of the Bigfin Reef Squid Sepioteuthis Lessoniana in Taiwan Coastal Waters

View Statistics Email Alert RSS Feed

Information

Details

Project title

Code/計畫編號

MOST109-2611-M019-002

Translated Name/計畫中文名

臺灣周邊海域萊氏擬烏賊洄游模式研究

Project Coordinator/計畫主持人

Chia-Hui Wang

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Environmental Biology and Fisheries Science

Website

https://www.grb.gov.tw/search/planDetail?id=13542518

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

1088千元

ResearchField/研究領域

海洋科學

萊氏擬烏賊是一廣泛分布於印度太平洋的沿近岸鎖管物種，也是重要的漁業捕撈物種之一，但是臺灣周邊海域萊氏擬烏賊族群的洄游模式及族群結構尚未有詳細研究，使得漁業管理辦法尚無法制定。頭足類的成長受到溫度影響，且無法承受劇烈的溫度改變，故其溫度洄游歷程是了解其族群分布的一個重要因子。過去用在其他海洋生物的電子標籤標識技術，雖然可以獲得長時間詳細的溫度洄游歷程，卻無法適用於敏感的頭足類生物上。近年來有些研究利用生物碳酸鹽結晶，例如魚類的耳石，分析其氧同位素記錄，可以用於回推生物的成長溫度以及洄游歷程。但是此技術過去未能被應用在頭足類的生態研究上，因為生物碳酸鹽結晶的氧同位素及溫度關係式有物種間的差異，而頭足類平衡石的關係式還沒有被發表過。本計畫將利用本團隊透過溫度控制養殖實驗，新建立出的頭足類平衡石氧同位素及溫度關係式，配合耳石研究中常用的微採樣技術，從平衡石的核心至邊緣進行分區採樣並分析其氧同位素，以獲得時間解析度較佳的萊氏擬烏賊生活史溫度歷程，結合比對臺灣周邊海域不同區域及深度的海水溫分布，以重建臺灣周邊海域各個季節群萊氏擬烏賊個體，在不同發育階段的棲地利用及洄游歷程資訊。本研究將是穩定同位素技術應用在頭足類洄游研究的首例，期所得的萊氏擬烏賊時空分布資訊，可以提供給未來在族群結構研究以及頭足類漁業管理上之參考。 Sepioteuthis lessoniana is a widely distributed neritic squid in the Indo-Pacific Ocean, as an important fisheries species, but unclear movement pattern and population structure makes the fishery management difficult. Temperature is one of the major factors influencing the movements of squids due to its vulnerable nature that are fragile on severe temperature change, however tradition tagging technique is difficult to apply on cephalopod. Oxygen isotope composition (δ18O values) recorded in biogenic carbonate is a powerful tool to investigate the temperature change in organisms’ habitats in relation to their growth and migration, such as applications of fish otolith in varied species. However the temperature-dependent equation of δ18O values has not been established for cephalopods, limiting the application to cephalopod ecology. In this project, we will apply one established statolith temperature-dependent equation of δ18O values through a controlled experiment along with micromilling technique to obtain sequential statolith samples for better temporal resolution to reconstruct the movement pattern of bigfin reef squid S. lessoniana in the surrounding waters of Taiwan temporally and spatially. This study is the first to apply statolith δ18O analysis on squid migration study, and the information can fill the gap of spatial and vertical distribution of S. lessoniana with ontogenetic stages and use on further population structure study and fishery management for this exploited fishery species in Taiwan.

Keyword(s)

萊氏擬烏賊
族群結構
平衡石
穩定同位素
溫度歷程
移動模式
Sepioteuthis lessoniana
population structure
statolith
stable isotopes
thermal history
movement pattern

DSpace CRIS

Movement Pattern of the Bigfin Reef Squid Sepioteuthis Lessoniana in Taiwan Coastal Waters

Details

Description