Canadian Journal of Fisheries and Aquatic Sciences, Ahead of Print.
Arctic char (Salvelinus alpinus) is a fish species known to occupy diverse habitats within the Arctic region. However, summer habitat use during the juvenile stage of the anadromous form is largely unknown. The present study aims to characterize fry and parr summer habitat preferences. Surveys were conducted by electrofishing, associated with physical habitat characterization on several rivers of the Ungava Bay, Nunavik, Canada. At the microhabitat and station scales (group of microhabitats), fry showed significant habitat preferences for shallow water and slow velocity. At the mesohabitat scale, fry showed a significant habitat selectivity for riffles. This habitat selectivity implies that habitat models can be built to evaluate the potential of habitat suitability for Arctic char fry. However, no significant habitat selectivity was found for parr. Parr size was nonetheless positively correlated with velocity, which was found to be a limitative factor for juvenile habitat use. This first attempt at modeling juvenile anadromous Arctic char habitat in rivers emphasizes the importance of selecting an appropriate spatial scale and reiterates the fact that parr showed relatively high plasticity in stream habitat selection.

中文翻译：

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Nunavik 溯河性北极红点鲑 (Salvelinus alpinus) 鱼苗和帕尔鱼夏季溪流栖息地偏好

加拿大渔业和水生科学杂志，印刷前。
北极红点鲑（Salvelinus alpinus）是一种已知在北极地区占据不同栖息地的鱼类。然而，在溯河形式的幼年阶段，夏季栖息地的使用在很大程度上是未知的。本研究旨在描述鱼苗和帕尔马夏季栖息地偏好。调查是通过电捕鱼进行的，与加拿大努纳维克 Ungava 湾的几条河流的物理栖息地特征相关。在微生境和站点尺度（微生境组），鱼苗表现出对浅水和慢速的显着栖息地偏好。在中生境尺度上，鱼苗对浅滩表现出显着的栖息地选择性。这种栖息地选择性意味着可以建立栖息地模型来评估栖息地适合北极红点鲑鱼苗的潜力。然而，parr 没有发现显着的栖息地选择性。尽管如此，帕尔大小与速度呈正相关，这被发现是青少年栖息地使用的限制因素。第一次尝试在河流中模拟幼年溯河北极红点栖息地，强调了选择适当空间尺度的重要性，并重申了 parr 在河流栖息地选择中表现出相对较高的可塑性这一事实。