{"id":16566,"date":"2021-10-29T09:48:24","date_gmt":"2021-10-29T01:48:24","guid":{"rendered":"https:\/\/www.oc.ntu.edu.tw\/oceng\/?p=16566"},"modified":"2023-08-02T05:01:45","modified_gmt":"2023-08-01T21:01:45","slug":"evaluation-of-the-impacts-of-climate-change-on-albacore-distribution-in-the-south-pacific-ocean-by-using-ensemble-forecast","status":"publish","type":"post","link":"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/16566\/","title":{"rendered":"Evaluation of the Impacts of Climate Change on Albacore Distribution in the South Pacific Ocean by Using Ensemble Forecast"},"content":{"rendered":"<p><!--:en--><\/p>\n<p align=\"center\">Yi-Jay Chang, Jhen Hsu, Lai Po-Kai and cooperative colleagues<\/p>\n<p>&nbsp;<\/p>\n<p>Tuna is one of the most popular fish species in the world. Taiwanese tuna longline fisheries operate in the three oceans<!--:--><!--more--><!--:en-->, and it has played an important role in the world&#8217;s tuna industry. Fish growth, reproduction, death, distribution, and migration are integrated biological responses\u00a0encompassing marine environmental conditions. We could expect that climate change may cause changes in tuna resources and fishing grounds. Therefore, understanding and predicting responses to global climate change are important issues for the scientific community to assist in designing effective fishery management to ensure the sustainability of the tuna stocks.<\/p>\n<p>&nbsp;<\/p>\n<p>Albacore tuna (<em>Thunnus alalunga<\/em>), known also as the longfin tuna (Figure 1), is an important upper tropic-level oceanic predator distributed globally between approximately 50\u25e6N and 45\u25e6S, with relatively lower abundance in equatorial areas. Albacore is typically canned \u2014 often labelled \u201cwhite tuna\u201d in the United States. In recent years, albacore tuna sashimi and sushi have also become popular. One of the largest fisheries for albacore is in the South Pacific Ocean where annual harvest contributed about 60% of the catch in the Pacific. In the South Pacific Ocean, most of the albacore was catched by longline fisheries (&gt;90%), the distant water longline fishing vessels from Taiwan, China, and the domestic longline fleets of various Pacific Island countries and territories (PICTs).<\/p>\n<p><a href=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image001.jpg\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-16567\" title=\"image001\" src=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image001.jpg\" alt=\"\" width=\"726\" height=\"544\" \/><\/a><\/p>\n<p style=\"text-align: left;\" align=\"center\">Figure 1. Albacore tuna (<em>Thunnus alalunga<\/em>). The maximum length and lifespan is about 105 cm fork length and 15 years, respectively.<\/p>\n<p>&nbsp;<\/p>\n<p>The authors examined the habitat preference and spatial distribution of south Pacific albacore using a generalized additive model fitted to the longline fisheries data from the Western and Central Pacific Fisheries Commission (WCPFC) and Inter-American Tropical Tuna Commission (IATTC). Future projections of albacore distributions (2020, 2050, and 2080) were predicted by using an ensemble modeling approach produced from various atmosphere-ocean general circulation models and anthropogenic emission scenarios (i.e., RCP 4.5 and RCP 8.5) to reduce the uncertainty in the projected changes.<\/p>\n<p>&nbsp;<\/p>\n<p>In this study, the dissolved oxygen concentration at 100 meters (DO100) and sea surface temperature (SST) were found to have the most substantial effects on the potential albacore distribution that the albacore preferred in the habitat with DO100 of 0.2\u20130.25 mmol L<sup>-1<\/sup> and SST of 13\u201322 \u00b0C. This study indicated that the northern boundary of albacore preferred habitat is expected to shift southward by about 5\u00b0 latitudes, and the relative abundance is expected to gradually increase in the area south of 30 \u00b0S from 2020 to 2080 for both RCP scenarios, especially with a higher degree of change for the RCP 8.5 (Figures 2 and 3).<\/p>\n<p><a href=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image003.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-16568\" title=\"image003\" src=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image003.png\" alt=\"\" width=\"958\" height=\"677\" \/><\/a><\/p>\n<p>Figure 2. The future ensemble projections of south Pacific albacore relative abundance (number\/1,000 hooks) distributions in quarter 3 estimated from the five atmosphere-ocean general circulation models (AOGCMs) for the current (2020), mid (2050), and late (2080) periods of the twenty-first century under the (A) RCP 4.5 and (B) RCP 8.5 (right panel) scenarios. The solid black lines denote the preferred habitat boundaries defined by relative abundance &gt; 25 number\/1,000 hooks.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image005.png\"><img decoding=\"async\" class=\"aligncenter size-full wp-image-16569\" title=\"image005\" src=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image005.png\" alt=\"\" width=\"982\" height=\"697\" \/><\/a><\/p>\n<p>Figure 3. The spatial distributions of the anomaly of relative abundance for south Pacific albacore in quarter 3 calculated by subtracting the predictions of the median ensemble GAM projections in 2020, 2050, and 2080 from the recent average of 2012\u20132016 under the (A) RCP 4.5 and (B) RCP 8.5 scenarios.<\/p>\n<p>&nbsp;<\/p>\n<p>Moreover, the albacore relative abundance is projected to decrease in the most exclusive economic zones (EEZs) of countries and territories in the South Pacific Ocean by 2080 (Figure 4).<\/p>\n<p>Currently, the conservation management measure (CMM-2015-2) for south Pacific albacore by the WCPFC has forbidden any increase in fishing vessels south of 20\u25e6S above 2005 levels (WCPFC, 2015). Under the current fishing effort constraint by the CMM, the future harvest catch of south Pacific albacore is expected to decrease because the potential albacore habitats are likely to increase in the latitudes of 30\u201340 \u00b0S but decreased in 20\u201330 \u00b0S of the western Pacific. This suggests that the effectiveness of CMM to achieve the fishery management goals could be impacted by the future potential distribution shifting. We assert not only the need but also the feasibility of incorporating approaches to address such shifts directly in the analysis of stocks and the management (e.g., management strategies evaluation) based thereon, so that the stock can be managed in a proactive and precautionary manner.<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image007.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-full wp-image-16570\" title=\"image007\" src=\"https:\/\/www.oc.ntu.edu.tw\/wp-content\/uploads\/2021\/10\/image007.png\" alt=\"\" width=\"879\" height=\"567\" \/><\/a><\/p>\n<p>Figure 4. Changes in albacore relative abundance (number\/1,000 hooks) within the exclusive economic zones (EEZs) of the countries or territories in the south Pacific Ocean for the current (2020), mid (2050), and late (2080) periods of the twenty-first century relative to 2012\u20132016 under the (A) RCP 4.5 and (B) RCP 8.5 scenarios. Only those countries or territories that had more than 30% of fishery data inside their EEZs were analyzed in this study. Countries or territories were ordered per mean latitude of the EEZ. The vertical dashed lines denote the reference line of \u00b1 5 in anomaly of relative abundance.<\/p>\n<p>&nbsp;<\/p>\n<p>For detail:<\/p>\n<p>Chang, Y.J.*, Hsu, J., Lai, P.K., Lan, K.W., Tsai, W.P. (2021) Evaluation of the impacts of climate change on albacore distribution in the South Pacific Ocean by using ensemble forecast. Frontiers in Marine Science, 8, 731950.<\/p>\n<p>&nbsp;<!--:--><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Yi-Jay Chang, Jhen Hsu, Lai Po-Kai and cooperative colleagues &nbsp; Tuna is one of the most popular fish species in the world. Taiwanese tuna longline fisheries operate in the three oceans<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[119],"tags":[142],"class_list":["post-16566","post","type-post","status-publish","format-standard","hentry","category-research-highlights","tag-research-highlights-en"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Evaluation of the Impacts of Climate Change on Albacore Distribution in the South Pacific Ocean by Using Ensemble Forecast - Institute of Oceanography, NTU<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.oc.ntu.edu.tw\/en\/research-highlights\/16566\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Evaluation of the Impacts of Climate Change on Albacore Distribution in the South Pacific Ocean by Using Ensemble Forecast - Institute of Oceanography, NTU\" \/>\n<meta property=\"og:description\" content=\"Yi-Jay Chang, Jhen Hsu, Lai Po-Kai and cooperative colleagues &nbsp; Tuna is one of the most popular fish species in the world. 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