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Heterocapsa bohaiensis ***.(Peridiniales:Dinophyceae):a novel marine dinoflagellate from the Liaodong Bay of Bohai Sea,China

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Acta Oceanologica Sinica 2018年第10期37卷 18-27页

作者： XIAO Jie SUN Na ZHANG Yiwen SUN Ping LI Yan PANG Min LI Ruixiang Key Laboratory of Science and Engineering for Marine Ecology and Environment the First Institute of OceanographyState Oceanic AdministrationQingdao 266061China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China guanghe crab industry limited company Panjin 124200China School of Food and Environment Dalian University of TechnologyPanjin 124221China

A small armed dinoflagellate bloomed in the aquaculture ponds off the coast of Liaodong Bay, Bohai Sea of China, resulting in heavy mortalities of the cultured prawns （Penaeusjaponicus） and larvae of Chinese mitten handed crabs （Eriocheir sinensis）. The bloom-forming species was successfully isolated, and cellular morphology of the specimen was consequently investigated through light, fluorescent and electron microscopy. The small （（14.4±1.6） μm in length） ellipsoid cells show typical Heterocapsa thecal plate arrangement （Po, cp, 5′, 3a, 7″, 6c, 5s, 5′″, 2″″）. The episome is evidently bigger than the hyposome. One to three spherical pyrenoids are located above or beside the large elongated nucleus. The body scale is characterized by a triangle basal plate with one central upright and nine peripheral spines. Above all, Heterocapsa bohaiensis could be distinguished from other Heterocapsa species by the combination of the cell size, morphology, cellular structure and body scale. Sequence analyses of both ITS and LSU regions reveal the significant genetic divergence between H. bohaiensis and other established species in this genus, further supporting novelty of this species. Noticeably, different sample treatment methods resulted in morphological variation of the apical pore complex （APC） of H. bohaiensis, which needs to be taken into account in future study.

关键词： Heterocapsa harmful algal bloom thecal plate body scale ITS

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Biodeposition, respiration, and excretion rates of an introduced clam Mercenaria mercenaria in ponds with implications for potential competition with the native clam Meretrix meretrix in Shuangtaizi estuary, China

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Chinese Journal of Oceanology and Limnology 2016年第3期34卷 467-476页

作者：张安国袁秀堂侯文久李晓东赵凯陈卫新苏秀榕 School of Marine Sciences Ningbo University Ningbo 315211 China National Marine Environmental Monitoring Center State Oceanic Administration (SOA) Dalian 116023 China College of Animal Husbandry and Veterinary Liaoning Medical University Jinzhou 121001 China Panjin guanghe Aquaculture company Panjin 124200 China Panshan Marine Fisheries Bureau Panjin 124200 China

This study aimed to evaluate the potential impacts of an introduced clam Mercenaria mercenaria on estuarine ecosystem, and implications for the niche competition with a native clam Meretrix meretrix. The biodeposition, respiration, and excretion rates of 34. mercenaria were determined seasonally using a sediment trap and a closed respirator in field. The biodeposition rates ofM. mercenaria were 0.06-0.37 g/ （ind.·d）, and the respiration rates were 0.31-14.66 mg/（ind.·d）. The ammonia and phosphate excretion rates were 0.18-36.70 and 1.44-14.87 μg/（ind.·d）, respectively. The hard clam M. mercenaria may discharge dry deposits up to 2.1 × 10^5 t, contribute 18.3 t ammonia and 9.0 t phosphate to culture ponds, and consume 7.9×10^3 t O2 from ponds annually. It suggested that the hard clam M. mercenaria might play an important role in pelagic-benthic coupling in pond ecosystem through biodeposition and excretion. A comparison of the key physiological parameters of the introduced clam M. mercenaria and the native clam Meretrix meretrix suggested that M. mercenaria had a niche similar to that of Meretrix meretrix in Shuangtaizi estuary and might have a potential competition with Meretrix meretrix for habitat and food ifM. mercenaria species escaped from the culture pond or artificially released in estuarine ecosystem.

关键词： Mercenaria mercenaria Meretrix meretrix species introduction native clam physiological parameters potential competition Shuangtaizi estuary

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