The variability in abundance and shell size of the thecosome pteropods Limacina spp. in the seasonal ice zone of the Southern Ocean in March
The variability in abundance and shell size of the thecosome pteropods Limacina spp. in the seasonal ice zone of the Southern Ocean in March
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DOI：
10.1007/s00300-023-03141-9
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发表时间：
2023-05
期刊：
影响因子：
1.7
通讯作者：
Kunio T. Takahashi;Haruko Umeda
中科院分区：
文献类型：
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作者：
Kunio T. Takahashi;Haruko Umeda
翼足类是海洋食物网的重要组成部分，特别是在极地生态系统中，也是海洋酸化研究的重点。尽管Limacina属的幼虫阶段常常构成浮游动物群落的主要组成部分，但对其种群动态知之甚少。我们报告高Limacinaspp。2000年3月，在南大洋季节性冰区的一个大区域内，通过连续浮游生物记录仪（CPR; 270微米网眼）对表层浮游动物群落进行取样时，发现了大量的浮游生物。高Limacinaspp.丰度延伸到600海里（ca 1 110公里）。Limacinaspp.使用1997年至2006年同一地区和取样期（3月）的北太平洋标准网（100微米网眼）数据评估了丰度和贝壳大小。虽然Limacinaspp. 2000年是研究期内最高的一年，但其总体丰度低于同期的平均值。大多数年份的平均贝壳尺寸在160-300微米之间，而2000年的平均尺寸相对较大（444.7微米）。我们的结论是，270微米网眼的CPR可以捕捉到2000年3月占主导地位的大型Limacinindividuals。新一代的繁殖和生长时间可能影响整个采样区的Limacinaabundance。
Thecosome pteropods form an important part of marine food webs, especially in polar ecosystems, and are the focus of research on ocean acidification. Although the larval stages of species in the genusLimacinaoften form major components of zooplankton communities, little is known of their population dynamics. We report highLimacinaspp. abundance in March 2000 during surface zooplankton community sampling via a Continuous Plankton Recorder (CPR; 270-µm mesh) in a large area within the seasonal ice zone of the Southern Ocean. Regions with highLimacinaspp. abundances extended to 600 nautical miles (ca1110 km). Annual variability inLimacinaspp. abundance and shell size is evaluated using North Pacific standard net (100-µm mesh) data from the same area and sampling periods (March) from 1997 to 2006. Although the relative total abundance ofLimacinaspp. in 2000 was the highest in the study period, its overall abundance was lower than the mean value for that period. Mean shell size for most years ranged 160–300 µm, while a relatively large mean size (444.7 µm) occurred in 2000. We conclude that a CPR with 270-µm mesh could catch largeLimacinaindividuals that dominated in March 2000. The timing of reproduction and growth of the new generation may influenceLimacinaabundance throughout the sampling area.