Life‐history traits of the endangered mud snail <i>Batillaria multiformis</i> in their northern limit population in Mutsu Bay, Japan
Life‐history traits of the endangered mud snail <i>Batillaria multiformis</i> in their northern limit population in Mutsu Bay, Japan
复制标题
日本陆奥湾濒危泥螺<i>Batillaria multiformis</i>北部极限种群的生活史特征
DOI：
10.1111/1440-1703.12347
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发表时间：
2022
影响因子：
2
通讯作者：
Igarashi Takeshi
中科院分区：
文献类型：
--
作者：
Kanaya Gen;Yamada Katsumasa;Itoh Hajime;Igarashi Takeshi
作为一所小学以公民为基础的研究项目，我们研究了日本最北端种群之一木须湾濒危泥螺多形巴蒂利亚的生活史特征。夏季潮间带钉螺广泛分布，秋季至冬季钉螺密集聚集在低潮线附近。贝壳长度(SL)为1.2~49.5 mm，种群内有1~4个或4个以上大小的种群，8~9月产卵，秋季定居，次年春季生长到4~6 mm SL。第二至第五个秋季钉螺分别长到5-10、10-15、15-20和20-25 mm SL。7-8月增速最高，9-4月贝壳停止增长。钉螺在定居后至少4-10 年(24.1至约50 mm SL)成熟性成熟，此时贝壳停止生长并形成愈伤组织旋钮。与南方种群相比，木苏湾的多形巴蒂利亚螺壳尺寸大得多，成熟延迟。贝壳生长速率在2014年、2015年和2016年夏季不同(分别为+0.69、+1.11和+4.59 mm SL 30-d−1)，对应于8月的平均沉积物温度(分别为22.8、24.5和26.4℃)。这些结果表明，在北方极限种群中，温度条件是决定贝壳年生长的重要因素。多种多样的。持续的气候变化可能导致包括泥螺在内的大型无脊椎动物生活史特征的变化，特别是在其北部分布界限附近。
As a citizen‐based research project in an elementary school, we examined the life‐history traits of the endangered mud snailBatillaria multiformisin Mutsu Bay, one of the species northernmost populations in Japan. The snails occurred widely in the intertidal zone in summer, but they were densely aggregated near the low‐tide line from autumn to winter. Shell lengths (SLs) ranged from 1.2 to 49.5 mm, and one to four or more size cohorts occurred in the population.Batillaria multiformisspawned from August to September, settled in autumn, and grew to 4–6 mm SL the following spring. The snails grew to 5–10, 10–15, 15–20, and 20–25 mm SL in the second to fifth autumns, respectively. The highest growth rates were from July to August, while shell growth stopped from September to April. The snails became sexually mature at least 4–10 years (24.1 to ca. 50 mm SL) after settlement, at which time shell growth stopped and a callus knob was formed.Batillaria multiformisin Mutsu Bay exhibited much larger shell sizes and delayed maturation compared to southern populations. Shell growth rates differed in the summers of 2014, 2015, and 2016 (+0.69, +1.11, and +4.59 mm SL 30‐d−1, respectively), corresponding to the mean sediment temperatures in August (22.8, 24.5, and 26.4°C, respectively). These results indicate that thermal conditions constitute an important determinant of annual shell growth in the northern limit population ofB. multiformis. Ongoing climate change can lead to changes in life‐history traits of macroinvertebrates, including mud snails, particularly near their northern distribution limits.