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Algal decay, temperature and body size influencing trophic behaviour of wrack consumers in sandy beaches

机译：藻类腐烂，温度和体型影响沙滩上失事消费者的营养行为

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摘要

Drift macroalgae detached from rocky substrate frequently strand on the shoreline, supplying food and habitat to a number of coastal species and sustaining important ecological processes, such as consumption and biogeochemical processing. Large amounts of algal wrack subsidies in open-coast sandy beaches follow the consumption pathway through the activity of upper shore crustaceans. The potential effect of the consumer population on the fate of algal subsidies depends on the rate at which these allochthonous inputs are exploited. Consumption in turn depends on the edibility of the stranded wrack and the environmental conditions that affect both consumers and consumed materials. The degradative process of algal wrack through the consumption pathway was analysed in a set of laboratory and field experiments where the effect of temperature and decomposition level was tested. Pre-weighted fragments of Saccorhiza polyschides and Sar-gassum muticum were supplied in independent containers harbouring groups of small, medium and large size classes of Talitrus saltator, a common supratidal amphipod widely distributed along the NE Atlantic and Mediterranean sandy beaches. To check the influence of primary environmental variables, such as temperature, assays were performed along the range of expected temperatures in the region, at 5, 10, 15, 20, 25, 30 and 35 ℃. The influence of unpredictable natural events that are endured by the algal material once stranded on the beach was evaluated by mimicking macroalgae drying, burying and ageing along different time lapses. Consumer behaviour in the field was tested by adding individuals and algal fragments into experimental containers, as well as in manipulative assays where algal fragments were deployed on the drift line, by night at low tide, following the peak of consumer abundance on the beach. The consumption rate on fresh material depended on temperature and body size. Both low and high temperatures drastically reduced the consumption of algal material, with the feeding rate increasing with decreasing body size. Decomposition of algae enhanced the consumption, with maximum rates obtained when algae decayed in a wet environment. Consumption rose with increasing algal humidity, with deterrent molecules (such as phenolics) playing a minor role once the decomposition evolved with time.
机译：与岩石底物分离的大型藻类经常在海岸线上搁浅，为许多沿海物种提供食物和栖息地，并维持重要的生态过程，如食用和生物地球化学加工。开放海岸沙滩的大量藻残补贴通过上岸甲壳类动物的活动遵循消费途径。消费人群对藻类补贴命运的潜在影响取决于利用这些异源投入物的速度。消费反过来取决于搁浅残骸的可食用性以及影响消费者和消费材料的环境条件。在一组实验室和现场实验中分析了藻类通过消耗途径的降解过程，在其中测试了温度和分解水平的影响。将预先称重的刺柏多孢子菌和粘液Sar-gassum muticum装在独立的容器中，该容器带有小，中和大尺寸类别的塔利特鲁盐沼，这是一种常见的上翅类两足动物，广泛分布于东北大西洋和地中海沙滩。为了检查主要环境变量（例如温度）的影响，在该区域的预期温度范围（5、10、15、20、25、30和35℃）上进行了测定。通过模拟大型藻类在不同时间流逝中的干燥，掩埋和衰老，评估了藻类材料一旦搁浅在海滩上所承受的不可预测的自然事件的影响。通过将个人和藻类碎片添加到实验容器中，以及在操纵性试验中测试藻类的消费者行为，该试验中，在海滩上的消费者数量达到峰值之后，在低潮之夜，将藻类碎片部署在漂流线上。新鲜物料的消耗率取决于温度和体型。低温和高温都极大地减少了藻类物质的消耗，并且随着体型的减小进食速度也随之增加。藻类分解增加了消耗量，藻类在潮湿环境中腐烂时获得最大的吸收率。消耗随着藻类湿度的增加而上升，一旦分解随时间而发展，威慑分子（例如酚醛树脂）就不起什么作用。

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  • 来源
    《Marine biology》 |2015年第1期|221-233|共13页
  • 作者

    Mariano Lastra; Jesus Lopez; Gabriela Neves;

  • 作者单位

    Departamento de Ecologia y Biologia Animal, Estacion de Ciencias Marinas de Toralla (ECIMAT), Universidad de Vigo, 36331 Vigo, Spain;

    Departamento de Ecologia y Biologia Animal, Estacion de Ciencias Marinas de Toralla (ECIMAT), Universidad de Vigo, 36331 Vigo, Spain;

    Departamento de Biologia Marinha, Instituto de Biologia, Universidade Federal Fluminense, Niteroi, RJ CEP 24020-140, Brazil;

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