Effects of Ocean Currents and Watershed Factors on the Fish Fauna of River Estuaries of a Peninsular Bordering Biogeographic Zone
Effects of Ocean Currents and Watershed Factors on the Fish Fauna of River Estuaries of a Peninsular Bordering Biogeographic Zone
复制标题
洋流和流域因素对半岛生物地理区河口鱼类区系的影响
DOI：
10.1007/s12237-022-01097-3
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发表时间：
2022
影响因子：
2.7
通讯作者：
Kano Yuichi
中科院分区：
文献类型：
--
作者：
Itsukushima Rei;Kano Yuichi
本研究调查了日本本岛最北部的下北半岛和津轻半岛的鱼类区系多样性。由于洋流影响咸水和咸水鱼类的分布和扩散，因此假定在洋流复杂的目标区域，河流河口的鱼类多样性可能在河流之间有很大差异。此外，目标区域位于地形复杂的半岛上，地形因素也被认为是影响鱼类区系的主要因素。在25个河口区共采集鱼类34种6879尾。此外，聚类分析结果表明，津轻暖流，从暖流（对马电流）在日本海一侧到太平洋一侧，强烈影响的存在，在区域河流河口区的鱼类区系。此外，在流入津轻海峡的河流中，波浪暴露是边缘的（7.4 ± 5.8），没有咸水鱼，但观察到依赖于砾石床的鱼类。该组河口河区河床比降较大（1.65 ± 0.99%）。河床由石头和砾石组成，这表明除了地理学，环境因素强烈影响鱼类区系的存在。此外，与以往在下北半岛进行的研究相比，南部裸虎鱼的分布区域扩大，可能是由于气候变化导致海水温度升高。在目标区域，水流和地形复杂，很明显，河流流入的区域和地形因素决定了河口的鱼类区系，这表明阐明复杂的环境因素和生物区系之间的关系是重要的河流环境管理和保护生态学。
This study investigated the fish fauna diversity of the Shimokita and Tsugaru peninsulas in the northernmost part of the main island of Japan. Since ocean currents influence brackish and saltwater fish distribution and dispersion, it is assumed that in the target area where ocean currents are complex, the ichthyofaunal diversity of river estuaries may vary significantly between rivers. In addition, the target area is located on a peninsula with complex topography, and topographical factors are also considered major factors influencing the fish fauna. During the field survey, 6879 individuals of fish from 34 species were collected from 25 river estuarine areas. Furthermore, the cluster analysis results indicated that the Tsugaru Warm Current, which flows from the warm current (Tsushima Current) on the Sea of Japan side to the Pacific Ocean side, strongly influences the presence of fish fauna in the regional river estuarine areas. Moreover, the wave exposure was marginal in rivers flowing into the Tsugaru Strait (7.4 ± 5.8), and saltwater fishes were absent, whereas fishes that depend on the gravel bed were observed. The bed slope of the estuarine river area of this group was large (1.65 ± 0.99%). The riverbed comprised stone and gravel, suggesting that in addition to biogeography, environmental factors strongly influence the presence of fish fauna. Furthermore, compared with previous studies conducted in the Shimokita Peninsula, the distribution area of the southernGymnogobiusspecies expanded, possibly due to the increase in seawater temperature caused by climate change. In the target area, where currents and topography are complex, it became clear that the area into which the river flows and topographical factors determine the fish fauna of river estuaries, suggesting that elucidating the relationship between complex environmental factors and biota is important for riverine environmental management and conservation ecology.