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Spatio-temporal variability and association of diatom-dinoflagellate assemblages of Acanthophora, Hypnea and Gracilaria (Rhodophyta)
European Journal of Phycology ( IF 2.4 ) Pub Date : 2020-05-18 , DOI: 10.1080/09670262.2020.1740797
Romella T. Beringuela 1, 2 , Daniel John E. Purganan 1 , Rhodora V. Azanza 1, 3 , Deo Florence L. Onda 1
Affiliation  

ABSTRACT Epiphytic microalgae can significantly affect the host seaweed either by complementing, or competing for, resources. Here, epiphytic diatom and dinoflagellate species assemblages on the macroalgae Acanthophora spicifera, Hypnea pannosa and Gracilaria salicornia collected during the north-east (February), inter- (April) and south-west (June) monsoons in 2015 along the coast of Lucero, Pangasinan, North-western Philippines were examined and characterized. Results showed that diatom–dinoflagellate assemblages strongly clustered by season rather than by geographic location. Within season, a minor clustering by macroalgal forms, rather than host species identity, was also observed, which could be associated with the differences in the complexity and texture of the upright and prostrate seaweeds. Examination of the ‘thallisphere’ using confocal laser scanning microscopy further revealed the close proximity of some of the ‘resident’ epiphytic species to the cortical cells of the host, causing deformities and implying more complex interactions. Our results suggest that epiphytic community assemblages were influenced by both the environmental conditions associated with seasonal variation and the microhabitats in the surface of the different algal forms.

中文翻译:

棘藻属、Hypnea 和江蓠属 (Rhodophyta) 的硅藻-甲藻组合的时空变异性和关联

摘要 附生微藻可以通过补充或竞争资源来显着影响寄主海藻。在这里,2015 年在东北(2 月)、间(4 月)和西南(6 月)季风期间沿卢塞罗海岸收集的大型藻类 Acanthophora spicifera、Hypnea pannosa 和 Gracilaria salicornia 上的附生硅藻和甲藻物种组合,对菲律宾西北部的 Pangasinan 进行了检查和表征。结果表明,硅藻-甲藻组合按季节而不是按地理位置强烈聚集。在季节内,还观察到大型藻类形式的小聚集,而不是宿主物种身份,这可能与直立和匍匐海藻的复杂性和质地差异有关。使用共聚焦激光扫描显微镜检查“叶状体”进一步揭示了一些“常驻”附生物种与宿主的皮质细胞非常接近,导致畸形并暗示更复杂的相互作用。我们的研究结果表明,附生群落组合受到与季节变化相关的环境条件和不同藻类表面微生境的影响。
更新日期:2020-05-18
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