Fish Diversity of Subarctic Waters in Japan

Kai, Yoshiaki

doi:10.1007/978-981-16-7427-3_7

Cited by 8 publications

(4 citation statements)

References 50 publications

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“…However, the increase does not suggest that the environmental conditions have actually improved. The fish distribution pattern in Japanese water, including the incidence of vagrant fish, is associated with several currents around the Japanese islands (Figure 1) [38,[47][48][49][50] . Therefore, investigating the relationships between currents and biodiversity patterns under climate change is a possible approach to develop better assessment criteria.…”

Section: Discussionmentioning

confidence: 99%

Large scale eDNA database reveals latitudinal diversity gradients with seasonal variations

Kasada

Shinohara

Fukasawa

et al. 2023

Preprint

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The spatial and temporal distribution patterns of marine organism diversity are crucial for the sustainable exploitation of fishery resources, management and preservation of marine ecosystems. We investigated the latitudinal diversity gradients of fish genera in Japanese waters using an environmental DNA (eDNA) survey. The environmental DNA data for 2111 surveys across Japan were obtained from the All Nippon eDNA Monitoring Network (ANEMONE) database. We observed a negative correlation between diversity and latitude in Japanese waters. The latitudinal gradient differed between seasons (correlation was especially negative in summer), suggesting that the seasonal change in the latitudinal gradient may be associated with the incidence of vagrant fish from tropical seas, and not the commonly observed pattern of seasonal migration (i.e., southwards in winter and northwards in summer). Furthermore, we found that global warming may lead to a temporary increase in biodiversity by increasing the incidence of vagrant fish from outside regions; however, this increase is not substantial. Although we did not find significant differences between years, further long-term and systematic monitoring may reveal temporal changes in marine biodiversity over longer time-periods, thus reflecting climate changes. Overall, the continued operation of ANEMONE will be the key to the future conservation of biodiversity in Japanese waters.

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Section: Discussionmentioning

confidence: 99%

Large scale eDNA database reveals latitudinal diversity gradients with seasonal variations

Kasada

Shinohara

Fukasawa

et al. 2023

Preprint

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“…Seasonal vagrancy or "ineffective dispersal" is a phenomenon documented annually along the eastern coastline of Japan where the Kuroshio Current, after an increase in its flow rate in the East China Sea during the summer months, transports subtropical fish larvae and juveniles to temperate mainland sites in the autumn months, including many pomacentrids (damselfishes and clownfishes) and chaetodontids (butterflyfishes) (Kai et al, 2022). Our detection of A. septemfasciatus could potentially have been of migrants of such vagrants from the Izu Islands, facilitated by the Kuroshio and Zunan Islands as stepping stones (Kai et al, 2022;Kuriiwa et al, 2014). However, we consider this unlikely as it would require an exceptional reach by the Kuroshio or significant mobility by immature fish.…”

Section: Primer Name Primer Sequence (5′-3′) Lengthmentioning

confidence: 99%

Fish and coral assemblages of a highly isolated oceanic island: The first eDNA survey of the Ogasawara Islands

Açıkbaş,

Narisoko,

Huerlimann

et al. 2024

Environmental DNA

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The Ogasawara Islands are a highly isolated oceanic archipelago in the Pacific Ocean that possess unique faunal and floral biodiversity with a high level of endemism. As historically more focus has been put on the terrestrial realm in examining diversification and evolutionary processes on oceanic islands, publicly accessible and spatially resolved data of marine reef ecosystems remain scarce. To address this issue, we conducted the first environmental DNA (eDNA) metabarcoding surveys of the actinopterygian (ray‐finned) and elasmobranch fishes and of Scleractinia coral assemblages in the waters of the Ogasawara Islands. We detected a total of 124 unique taxa of fish and 38 unique taxa of scleractinian corals. Overall, our eDNA results confirmed that the Ogasawara Islands host a rich variety of coral and fish fauna and underline the strength of eDNA surveys in rapidly obtaining targeted multi‐taxa data using seawater samples, requiring comparatively little effort and a lack of requirement for in situ taxonomic expertise. We anticipate that continued biomonitoring using eDNA with high sampling effort will add to and complement the body of knowledge regarding species distributions, invasive species, and biodiversity hotspots within oceanic archipelagos.

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“…Stemmed from continental Asia, freshwater fishes established themselves in the Japanese archipelago through two main pathways: the Siberian route and the Chinese route (Aoyagi, 1957). The Siberian route involved predominantly cold‐water fishes spreading from the Heilongjiang River (aka Amur River) to the waters in Hokkaido, the northernmost island of present‐day Japan (Kai, 2022). The Chinese route witnessed a fish fauna primarily composed of temperate species originating from the ancient Yellow River basin, relocating to Kyushu, the southernmost main island of Japan (Tabata, 2022).…”

Section: Introductionmentioning

confidence: 99%

Native fish assemblages in natural lakes across Japan: Endemism deterioration lasting centuries

Dai,

Matsuzaki,

Negishi

et al. 2024

Diversity and Distributions

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AimThis study aimed to illustrate the changing diversity patterns of native freshwater fish in the past two centuries and to identify priority locations for native fish conservation to counter future degradation.LocationJapanese archipelago.MethodsWe used the published native fish fauna data in 39 lakes across Japan, analysing historical and current diversity and projecting future distribution patterns based on the Japanese Red List. We assessed fish assemblages' taxonomic, phylogenetic, and functional alpha and beta diversity across different periods. Additionally, we proposed a cumulative diversity index that incorporated taxonomic, phylogenetic and functional facets, and then examined its relationship with the latitudinal positioning of the lakes across periods.ResultsWe observed a significant decrease in the richness of native freshwater fish since historical periods. Accompanying this decline were significant reductions in both phylogenetic relatedness and functional redundancy. Fish beta diversity increased from the past to the present and is predicted to decline drastically, indicating an ongoing homogenization process. Using the cumulative diversity index, we identified Hokkaido and Kyushu as crucial habitats for endemic fishes. These islands, with unique biogeographical backgrounds, contributed substantially to the national dissimilarity patterns of native fish assemblages in the historical period. However, the contribution is diminishing due to the ongoing decline in fish endemism.Main ConclusionsThe conservation priority of native freshwater fish in Japan should be assigned to Hokkaido and Kyushu due to the inhabited endemic species. The proposed framework for assessing the cumulative diversity of biotic communities presented the potential to aid macroecological explorations that underpin biodiversity conservation.

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Fish Diversity of Subarctic Waters in Japan

Cited by 8 publications

References 50 publications

Large scale eDNA database reveals latitudinal diversity gradients with seasonal variations

Large scale eDNA database reveals latitudinal diversity gradients with seasonal variations

Fish and coral assemblages of a highly isolated oceanic island: The first eDNA survey of the Ogasawara Islands

Native fish assemblages in natural lakes across Japan: Endemism deterioration lasting centuries

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