Complementary distribution of non-native white-spotted charr and native red-spotted masu salmon in Shikoku Island, southwestern Japan: a consequence of interspecific interactions?
Complementary distribution of non-native white-spotted charr and native red-spotted masu salmon in Shikoku Island, southwestern Japan: a consequence of interspecific interactions?
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日本西南部四国岛非本地白点红点鲑和本地红点马苏鲑鱼的互补分布：种间相互作用的结果？
DOI：
10.1007/s10228-022-00862-5
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发表时间：
2022
影响因子：
1.2
通讯作者：
& Mizuno N
中科院分区：
文献类型：
--
作者：
Inoue M;Ichimori D;Abe H;& Mizuno N
白斑红点鲑和大马哈鱼（Oncorhynchus masousubspp.）是日本列岛的代表性溪鲑。虽然白斑红点鲑在四国和九州岛没有自然分布，但在那里发现了它的引进种群。在这项研究中，我们通过比较1998年与2013-2014年的数据，描述了四国河源头支流中非本地白斑红点鲑的范围扩展，并研究了其对本地红斑马苏鲑鱼（Oncorhynchus masou ishikawae）丰度的影响。1998年，非本地白斑红点鲑的分布仅限于一条支流的一部分，但在2013-2014年，白斑红点鲑广泛分布在整个研究区（三条支流和河流主干），除河流河段以上的泥沙控制坝或瀑布。白点红点鲑的相对丰度（占两个物种总密度的百分比）显示出上游增加的模式，与两个物种在其原生范围内众所周知的纵向分布模式一致（即，分别在上游和下游的白斑红点鲑和红斑马苏鲑鱼的数量优势）。广义线性模型预测每个物种的丰度表明，白点红点鲑的分布是有限的障碍（大坝，瀑布），而白点红点鲑的丰度是由白点红点鲑负影响。总的来说，在扩散过程中，非本地白斑红点鲑可能减少了本地红斑马苏鲑鱼的丰度，在白斑红点鲑的非本地区域创造了两个物种的共同纵向分布模式。我们的研究结果表明，种间相互作用在形成白点红点鲑和红斑马苏鲑沿着纵向梯度的互补分布中起着重要作用。
White-spotted charr (Salvelinus leucomaenissubspp.) and masu salmon (Oncorhynchus masousubspp.) are representative stream salmonids in the Japanese Archipelago. Although white-spotted charr is not naturally distributed in Shikoku and Kyushu Islands, its introduced populations have been found there. In this study, we describe a range expansion of non-native white-spotted charr in headwater tributaries of a Shikoku river by comparing data in 1998 with that in 2013–2014, and examined its effect on the abundance of native red-spotted masu salmon (Oncorhynchus masou ishikawae). In 1998, the distribution of non-native white-spotted charr had been limited to a part of one tributary, but white-spotted charr in 2013–2014 was widely distributed throughout the study area (three tributaries and the river mainstem), except stream reaches above a sediment-control dam or a waterfall. Relative abundance of white-spotted charr (percentage in the total density of the two species combined) showed a pattern of upstream increase, being consistent with the well-known longitudinal distribution pattern of the two species in their native ranges (i.e., numerical dominance of white-spotted charr and red-spotted masu salmon in the upper and downstream reaches, respectively). Generalized linear models predicting the abundance of each species indicated that the distribution of white-spotted charr was limited by the barriers (dam, waterfall), while the abundance of red-spotted masu salmon was negatively affected by white-spotted charr. Overall, it is likely that non-native white-spotted charr had decreased the abundance of native red-spotted masu salmon during spreading, having created the common longitudinal distribution pattern of the two species in the white-spotted charr’s non-native region. Our results suggest that interspecific interactions play an important role in shaping the complementary distribution of white-spotted charr and red-spotted masu salmon along longitudinal gradients.
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