Flexibility of nutritional strategies within a mutualism: food availability affects algal symbiont productivity in two congeneric sea anemone species
Flexibility of nutritional strategies within a mutualism: food availability affects algal symbiont productivity in two congeneric sea anemone species
复制标题
DOI：
10.1098/rspb.2020.1860
复制
发表时间：
2020-12-09
影响因子：
4.7
通讯作者：
Bracken, Matthew E. S.
中科院分区：
文献类型：
--
作者：
Bedgood, Samuel A.;Mastroni, Sarah E.;Bracken, Matthew E. S.
互惠共生是常见的，特别是在营养不良的环境中，宿主和共生体之间的联系可以让共生伙伴持续存在，并共同竞争非共生物种。通常，这些互惠关系建立在宿主和共生体之间能量和营养物质（例如碳和氮）的密切转移上。然而，资源的可用性是不一致的，共生协会的利益可以取决于资源的可用性互利。我们操纵的饮食中的两个温带海葵属花侧耳属在外地和记录的响应海葵和藻类共生体在家庭共生藻科我们的治疗。海藻共生体密度、共生体体积和共生体光合效率对海葵饵料的变化有响应，但响应程度取决于海葵的种类。我们认为，温带海葵和它们的共生体可以响应海葵饮食的变化，修改之间的平衡异养和自养的共生。我们的数据支持这一假设，即共生体是上调或下调的基础上的食物供应，允许一个灵活的营养策略的基础上，外部资源。
Mutualistic symbioses are common, especially in nutrient-poor environments where an association between hosts and symbionts can allow the symbiotic partners to persist and collectively out-compete non-symbiotic species. Usually these mutualisms are built on an intimate transfer of energy and nutrients (e.g. carbon and nitrogen) between host and symbiont. However, resource availability is not consistent, and the benefit of the symbiotic association can depend on the availability of resources to mutualists. We manipulated the diets of two temperate sea anemone species in the genus Anthopleura in the field and recorded the responses of sea anemones and algal symbionts in the family Symbiodiniaceae to our treatments. Algal symbiont density, symbiont volume and photosynthetic efficiency of symbionts responded to changes in sea anemone diet, but the responses depended on the species of sea anemone. We suggest that temperate sea anemones and their symbionts can respond to changes in anemone diet, modifying the balance between heterotrophy and autotrophy in the symbiosis. Our data support the hypothesis that symbionts are upregulated or downregulated based on food availability, allowing for a flexible nutritional strategy based on external resources.