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Digestive gland microbiome of Pleurobema cordatum: mesocosms induce dysbiosis
Journal of Molluscan Studies ( IF 1.2 ) Pub Date : 2020-10-16 , DOI: 10.1093/mollus/eyaa032
Alison K Aceves 1 , Paul D Johnson 2 , Carla L Atkinson 3 , Brian C van Ee 3 , Stephen A Bullard 4 , Cova R Arias 4
Affiliation  

ABSTRACT
Feeding periodicities and rhythms of suspension-feeding bivalves in coastal waters are closely related to diel and tidal cyclic environmental changes, such as food availability and predation risk. Although such feeding periodicities of bivalves are important for understanding how their feeding strategies adapt to localized habitats, the feeding periodicity in bivalves in the field remains to be clarified, especially in infaunal species. The present study focused on the morphological condition of the crystalline style as an indicator of the feeding activity of the infaunal bivalve Manila clam, Ruditapes philippinarum, and estimated their feeding periodicity in the field. First, the effects of feeding (siphon-extending) behaviour, food and the light/dark cycle on the condition of the crystalline style (defined based on its morphology and hardness) were investigated in the laboratory. Results of the ordered logistic models and model selection showed that clams extending their siphons kept their crystalline styles hard. Furthermore, the effects of the light/dark cycle and tidal phase on the condition of the crystalline style were investigated in natural intertidal and subtidal zones and assessed using the results of the ordered logistic models. In the intertidal zone, the effect of the tidal phase was significant, whereas the effect of the light/dark cycle was not, and feeding was estimated to be active at ebb and flood tides, when the density of food particles was likely to be high. On the other hand, in the subtidal zone, the results of the model selection were not clear because of significant effects of interactions between the light/dark cycle and tidal phase. However, when the interactions were removed from the models, the effect of the light/dark cycle was significant, and feeding was estimated to be active at night when the predation risk from visual predators would be relatively low. These results confirm that R. philippinarum possesses behavioural plasticity in feeding periodicity, which is adaptable to both intertidal and subtidal zones.


中文翻译:

胸膜肺炎的消化腺微生物组:中诱导营养不良

摘要
沿海水域双壳捕食双壳类动物的摄食周期和节奏与狄尔和潮汐循环环境变化(如食物供应和捕食风险)密切相关。尽管双壳类动物的这种进食周期对于了解它们的进食策略如何适应局部生境非常重要,但该田间双壳类动物的进食周期仍有待阐明,尤其是在不常见的物种中。本研究集中于结晶风格的形态学条件作为infaunal双壳类蛤仔的摄食活动的指标,菲律宾蛤仔,并估算它们在野外的喂食周期。首先,在实验室中研究了进食(虹吸扩展)行为,食物和明/暗循环对晶体样式(根据其形态和硬度定义)的影响。有序逻辑模型和模型选择的结果表明,蛤extending延伸其虹吸管使它们的结晶风格保持坚硬。此外,在自然潮间带和潮间带研究了明/暗循环和潮汐相对晶型条件的影响,并使用有序逻辑模型的结果进行了评估。在潮间带,潮汐期的影响很明显,而明/暗循环的影响不大,据估计在退潮和洪潮时补给活跃,食物颗粒的密度可能很高。另一方面,在潮下带,由于明/暗循环和潮汐相之间相互作用的显着影响,模型选择的结果不清楚。但是,当从模型中删除了相互作用时,明/暗循环的影响就很明显,据估计,夜间进食很活跃,而视觉掠食者的捕食风险相对较低。这些结果证实了 估计晚上进食很活跃,因为视觉掠食者的捕食风险相对较低。这些结果证实了 估计晚上进食很活跃,因为视觉掠食者的捕食风险相对较低。这些结果证实了菲律宾河豚在摄食周期中具有行为可塑性,可同时适应潮间带和潮下带。
更新日期:2020-10-30
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