Potential smolting ability of stream‐dwelling Dolly Varden Salvelinus malma
Potential smolting ability of stream‐dwelling Dolly Varden Salvelinus malma
复制标题
溪流中栖息的 Dolly Varden Salvelinus malma 的潜在幼崽能力
DOI：
10.1111/j.0919-9268.2003.00759.x
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
K. Maekawa
中科院分区：
文献类型：
--
作者：
D. Kishi;K. Maekawa
花红点鲑生活史多态;种群由居民和迁徙个体组成。1在其分布范围的北方部分的沿海溪流中，种群具有成熟雄性幼鱼的溯河产卵生活史，而南部界限（即日本北海道岛）的所有种群具有溪流居民生活史，其中几乎所有个体一生都保持在淡水中。2，3然而，在北海道岛知床半岛的一些溪流中发现了一些洄游鱼（所谓的小鲑鱼）和成年洄游鱼。4，5这些事实表明，小鲑鱼或洄游鱼有时产生于这些种群中的淡水居民。目前，在溯河产卵鲑种群中，存在着大量的研究之间的关系，但在流居住鲑种群的关系的研究还没有进行。1999年8月，在知床半岛西海岸的Idashubetsu溪（44 07′ N，145 06′ E），用手网采集了0 ~ 8 cm叉长的多莉·瓦登（Dolly Varden）幼鱼，并对幼鱼的发病率及其与体长的关系进行了研究。这条小山溪长约7公里，流入鄂霍次克海。我们的采集点距离小溪大约4公里
Dolly Varden Salvelinus malma have polymorphic life histories; populations consist of resident and migratory individuals. 1 In coastal streams in the northern part of their distribution range, the populations have anadromous life histories with mature male parr, whereas all populations of the southern limits (ie Hokkaido Island, Japan) have stream resident life histories in which almost all individuals remain in freshwater throughout their lives. 2, 3 However, a few migrating fish (so-called smolt) and adult migrants have been found in some streams of Shiretoko Peninsula, Hokkaido Island. 4, 5 These facts suggest that smolt or migrant fishes are sometimes generated from freshwater residents in these populations. Presently, extensive studies exist on the relationship between smolting and juvenile size in anadromous salmonid populations, but few studies on the relationship in stream-dwelling salmonid populations have yet been performed. Here, we examine the possibility of smolt incidence from stream-resident Dolly Varden and the relationship between their incidence and body size.We collected 0+ age Dolly Varden (≤ 8 cm fork length) with a hand net (in August 1999) from Idashubetsu Stream (44 07′ N, 145 06′ E), on the western coast of Shiretoko Peninsula. This small mountainous stream is about 7 km long and flows into The Sea of Okhotsk. Our collection site was located approximately 4 km from the stream