東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Biology and Connectivity of Yellowfi...

Munoz-Abril, Laia J.,

Linked to FindBook

Google Book

Amazon

博客來

Biology and Connectivity of Yellowfin Tuna in the Eastern Pacific Ocean /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Biology and Connectivity of Yellowfin Tuna in the Eastern Pacific Ocean // Laia J Munoz-Abril.
Author:	Munoz-Abril, Laia J.,
Description:	1 electronic resource (168 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
Contained By:	Dissertations Abstracts International86-05B.
Subject:	Ecology. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31636155
ISBN:	9798342763974

Biology and Connectivity of Yellowfin Tuna in the Eastern Pacific Ocean /
Munoz-Abril, Laia J.,

Biology and Connectivity of Yellowfin Tuna in the Eastern Pacific Ocean /Laia J Munoz-Abril. - 1 electronic resource (168 pages)

Source: Dissertations Abstracts International, Volume: 86-05, Section: B.

High connectivity in marine populations is critical for maintaining genetic diversity, population resilience, and ecosystem health. This study investigates the yellowfin tuna (Thunnus albacares) population structure and connectivity in the Eastern Pacific Ocean (EPO), employing genomic, otolith microchemistry, stable isotopes, growth modeling, and reproductive analyses. Genomic analysis using single nucleotide polymorphisms revealed a single stock in the EPO, with minor genetic differences between fish from Colombia and elsewhere in the EPO. The otolith microchemistry and stable isotopes analyses indicated three distinct chemical groupings or clusters among the fish (in Colombia, Ecuador, and Mexico), representing potential nursery areas. These groupings suggest the existence of at least three ecological regions within the metapopulation that are influenced by different oceanographic conditions. Using the Richards growth model, growth and reproductive studies identified a three-phasic growth pattern; the growth results indicate variations compared to the model used in the current assessment, which is still awaiting approval and relies on a study from 1986. The present study determined a length at first maturity (L50) of 102 cm of fork length, with a potential spawning season of October through January. The reproductive results reflect variations compared to the most recent study on yellowfin tuna from different areas of the EPO that did not include the equatorial waters, which suggested an L50 of 80 cm, which is the gap addressed in the present research. The findings indicate a potential delay in reproductive maturity in individuals caught in the equatorial region. By identifying distinct genetic variations and key spawning areas, fisheries managers can implement focused conservation strategies, such as protecting spawning areas during critical periods to ensure stock replenishment. The in-depth analysis of growth patterns allows for precise age and size assessments, which are crucial for establishing effective catch limits and size restrictions. This ensures that younger fish are not overharvested, allowing them to mature and contribute to population sustainability. However, at the same time, it is vital to safeguard the largest fish, as they are crucial for breeding. With the integration of genomics, microchemistry, and stable isotopes data, the study improves the accuracy of stock assessments and reduces uncertainties regarding population connectivity. However, further studies are needed to resolve key questions (e.g., specific nursery area locations). This is vital for Regional Fisheries Management Organizations (RFMOs) to set science-based quotas and foster international cooperation, ensuring yellowfin tuna fisheries' long-term sustainability and productivity. This comprehensive approach highlights the importance of understanding yellowfin tuna's evolutionary history, local and regional dynamics, and life history traits for effective management and conservation. The study underscores the necessity of accurate stock definitions to prevent overfishing and ensure sustainable fisheries management. The findings offer a basis for RFMOs, including the Inter-American Tropical Tuna Commission (IATTC), to formulate conservation strategies that address challenges such as overfishing, habitat deterioration, and climate change.

English

ISBN: 9798342763974Subjects--Topical Terms:

516476
Ecology.
Subjects--Index Terms:

Yellowfin tuna

Biology and Connectivity of Yellowfin Tuna in the Eastern Pacific Ocean /
LDR:04802nmm a22004213i 4500 001 2429253
005 20250430093608.5
006 m o d
007 cr|nu||||||||
008 261011s2024 miu||||||m |||||||eng d
020 $a 9798342763974
035 $a (MiAaPQD)AAI31636155
035 $a AAI31636155
040 $a MiAaPQD $b eng $c MiAaPQD $e rda
100 1 $a Munoz-Abril, Laia J., $e author. $3 3816992
245 1 0 $a Biology and Connectivity of Yellowfin Tuna in the Eastern Pacific Ocean / $c Laia J Munoz-Abril.
264 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2024
300 $a 1 electronic resource (168 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Dissertations Abstracts International, Volume: 86-05, Section: B.
500 $a Advisors: Powers, Sean P. Committee members: Baker, Ronald; Dzwonkowski, Brian; Canty, Steven; Hearn, Alex.
502 $b Ph.D. $c University of South Alabama $d 2024.
520 $a High connectivity in marine populations is critical for maintaining genetic diversity, population resilience, and ecosystem health. This study investigates the yellowfin tuna (Thunnus albacares) population structure and connectivity in the Eastern Pacific Ocean (EPO), employing genomic, otolith microchemistry, stable isotopes, growth modeling, and reproductive analyses. Genomic analysis using single nucleotide polymorphisms revealed a single stock in the EPO, with minor genetic differences between fish from Colombia and elsewhere in the EPO. The otolith microchemistry and stable isotopes analyses indicated three distinct chemical groupings or clusters among the fish (in Colombia, Ecuador, and Mexico), representing potential nursery areas. These groupings suggest the existence of at least three ecological regions within the metapopulation that are influenced by different oceanographic conditions. Using the Richards growth model, growth and reproductive studies identified a three-phasic growth pattern; the growth results indicate variations compared to the model used in the current assessment, which is still awaiting approval and relies on a study from 1986. The present study determined a length at first maturity (L50) of 102 cm of fork length, with a potential spawning season of October through January. The reproductive results reflect variations compared to the most recent study on yellowfin tuna from different areas of the EPO that did not include the equatorial waters, which suggested an L50 of 80 cm, which is the gap addressed in the present research. The findings indicate a potential delay in reproductive maturity in individuals caught in the equatorial region. By identifying distinct genetic variations and key spawning areas, fisheries managers can implement focused conservation strategies, such as protecting spawning areas during critical periods to ensure stock replenishment. The in-depth analysis of growth patterns allows for precise age and size assessments, which are crucial for establishing effective catch limits and size restrictions. This ensures that younger fish are not overharvested, allowing them to mature and contribute to population sustainability. However, at the same time, it is vital to safeguard the largest fish, as they are crucial for breeding. With the integration of genomics, microchemistry, and stable isotopes data, the study improves the accuracy of stock assessments and reduces uncertainties regarding population connectivity. However, further studies are needed to resolve key questions (e.g., specific nursery area locations). This is vital for Regional Fisheries Management Organizations (RFMOs) to set science-based quotas and foster international cooperation, ensuring yellowfin tuna fisheries' long-term sustainability and productivity. This comprehensive approach highlights the importance of understanding yellowfin tuna's evolutionary history, local and regional dynamics, and life history traits for effective management and conservation. The study underscores the necessity of accurate stock definitions to prevent overfishing and ensure sustainable fisheries management. The findings offer a basis for RFMOs, including the Inter-American Tropical Tuna Commission (IATTC), to formulate conservation strategies that address challenges such as overfishing, habitat deterioration, and climate change.
546 $a English
590 $a School code: 0491
650 4 $a Ecology. $3 516476
650 4 $a Wildlife conservation. $2 fast $3 542165
650 4 $a Climate change. $2 bicssc $3 2079509
650 4 $a Biological oceanography. $3 2122748
653 $a Yellowfin tuna
653 $a Thunnus albacares
653 $a Reproductive maturity
690 $a 0329
690 $a 0284
690 $a 0404
690 $a 0416
710 2 $a University of South Alabama. $b Marine Sciences. $e degree granting institution. $3 3816993
720 1 $a Powers, Sean P. $e degree supervisor.
773 0 $t Dissertations Abstracts International $g 86-05B.
790 $a 0491
791 $a Ph.D.
792 $a 2024
856 4 0 $u https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31636155