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首页> 外文期刊>ICES Journal of Marine Science >Temperature-based spawning habitat selection by capelin (Mallotus villosus) in Newfoundland
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Temperature-based spawning habitat selection by capelin (Mallotus villosus) in Newfoundland

机译：纽芬兰的毛鳞鱼基于温度的产卵栖息地选择

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The location of reproduction is a key life history trait, as it influences the bio-physical conditions that offspring experience and, thus, fitness. Capelin Mallotus villosus is a small (< 200 mm), short-lived forage fish that spawns in two habitats in coastal Newfoundland: warm beaches and cool, deep water (15-40 m). From 2009 to 2014, we investigated temperature-dependent spawning habitat use by quantifying hourly temperature at spawning sites during July within each habitat along with population-level spawning site use. Capelin did not spawn at sites with temperatures < 2 degrees C or consistently > 12 degrees C, supporting the estimated suitable spawning temperature range (2-12 degrees C). Spawning typically occurred exclusively at beaches early in July when deep-water habitat was too cold (i.e.< 2 degrees C), and then switched to deep-water habitat later in July when beaches became too warm (i.e.> 12 degrees C). Spawning overlapped for 1-3 d in both habitats when temperatures were within suitable ranges (2011, 2013), but capelin also spawned exclusively in one habitat when temperatures remained suitable in the other. The latter suggests that other factors influence spawning habitat selection, such as conspecific egg densities and other environmental conditions. Overall, the flexible use of spawning habitats, along with wide tolerance ranges of capelin eggs to environmental conditions, are likely key adaptations to maximize fitness and stabilize population dynamics of this important forage fish species in an unpredictable environment.
机译：繁殖的位置是生命历史的关键特征，因为它影响后代经历的生物物理条件，从而影响其适应能力。 Capelin Mallotus villosus是一种小型（<200毫米）短寿命的饲料鱼，产于纽芬兰沿海的两个栖息地：温暖的海滩和凉爽的深水（15-40 m）。从2009年到2014年，我们通过量化每个栖息地内7月产卵场每小时的温度以及种群水平产卵场的使用，调查了温度相关的产卵栖息地的使用情况。 Capelin没有在温度低于2摄氏度或始终高于12摄氏度的位置产卵，从而支持了估计的合适产卵温度范围（2-12摄氏度）。产卵通常只发生在7月初的深水栖息地过冷（即<2摄氏度）的海滩上，然后在7月下旬当海滩温度过高（即> 12摄氏度）时切换到深水栖息地。当温度在合适的范围内时，两个生境中的产卵重叠1-3 d（2011年，2013年），而当另一个生境中的温度仍然合适时，毛鳞鱼也仅在一个生境中产卵。后者表明其他因素会影响产卵栖息地的选择，例如特定的卵密度和其他环境条件。总体而言，灵活使用产卵栖息地以及毛鳞鱼卵对环境条件的宽容范围，可能是在不可预测的环境中最大程度地适应这种重要饲料鱼的适应性并稳定其种群动态的关键适应措施。

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