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Living on a trophic subsidy: Algal quality drives an upper-shore herbivore’s consumption preference and absorption but not growth rates

机译：靠营养补贴生活：藻类的质量决定了上岸草食动物的消费偏好和吸收但没有增长速度

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The transfer of seaweeds from subtidal bottoms to nearby intertidal rocky shores is a common but often overlooked phenomenon. Freshly detached seaweeds often represent critical trophic subsidies for herbivores living in upper-shore rocky intertidal areas, such as the marine snail Diloma nigerrima. This species relies on three species of seaweeds for food and displays feeding strategies to deal with a resource that is scarce and at times unpredictable. This study focused on the nutritional quality of freshly detached algae (Durvillaea antarctica, Lessonia spicata and Lessonia trabeculata) and measured Diloma nigerrima’s algal consumption rates in trials with and without choice. Absorption efficiency and growth of individual snails fed on each alga were also measured. Durvillaea antarctica had the highest nutritional quality and was the most consumed algae in both single and multiple-choice trials. Absorption efficiency was also highest for D. antarctica but growth rates of snails fed with this species were similar to those fed with the other algae. Combined, these results suggest that D. nigerrima has the ability to discriminate among seaweeds based on their nutritional quality. A potential increase in oxygen uptake when D. nigerrima is consuming the preferred food item is also proposed as a plausible hypothesis to explain the mismatch between snails’ preference and growth rate. These results aim to guide further studies on trophic subsidies and their role in coastal systems.
机译：海藻从潮间带底部转移到附近的潮间带多岩石海岸是一种普遍但经常被忽视的现象。新鲜分离的海藻通常代表生活在上岸岩石潮间带地区的食草动物的重要营养补贴，例如海洋蜗牛Diloma nigerrima。该物种依靠三种海藻作为食物，并显示出觅食策略以应对稀缺且有时不可预测的资源。这项研究的重点是新鲜分离的藻类（南极藻（Durvillaea antarctica），雀Lesson（Stulia spicata）和雀Lesson（Essonia trabeculata）的营养质量，并在有选择和无选择的试验中测量了黑毛病藻的食用率。还测量了喂食每个藻类的单个蜗牛的吸收效率和生长。在单选和多选试验中，南极硬毛杜鹃具有最高的营养品质，也是藻类消耗最多的藻类。南极D.的吸收效率也最高，但是饲喂该物种的蜗牛的生长速度与饲喂其他藻类的蜗牛相似。结合起来，这些结果表明，黑藻D. nigerrima有能力根据其营养质量来区分海藻。还提出了一种可能性，即当黑纹病菌（D.nigerrima）食用首选食品时，其摄氧量的潜在增加可能是解释蜗牛的偏好和生长率之间不匹配的假说。这些结果旨在指导对营养补贴及其在沿海系统中的作用的进一步研究。

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