菲律宾帕西格河桡足类表生物Vorticella和Colacium

Q3 Environmental Science Philippine Journal of Systematic Biology Pub Date : 2020-08-12 DOI:10.26757/pjsb2020a14008
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引用次数: 0

摘要

桡足类的壳状外骨骼是原生动物等微生物的支架。尽管桡足类是高度国际化的,但它们在热带的相关表生生物却鲜为人知。这项研究首次在菲律宾报道了在帕西格河中,类桡足类圆背蛛(Arctodiaptomus dorsalis)上的纤毛虫Vorticella,以及类桡足纲热剑水蚤(Thermocycops crassus)和中剑水豚(Mesocyclops microlasius)上的Vorticell和眼虫Colacium。然而,在2018年1月至5月和7月至12月的四个采集点观察到的桡足类感染率较低,为0.83%(13039个中有108个)。有趣的是,Vorticella和Colacium在剑足类动物中比在蛛形桡足类动物上更常见,主要分布在桡足类的尿体、胸部、头体和桡足类成年期。Colacium也被发现附着在触角、游泳腿、尾支和刚毛上。表皮生物的患病率与部位有关;Vorticella在马尼拉湾(1号地点)附近的水域更为丰富,那里记录到高盐度、电导率和总溶解固体,而Colacium在Laguna de Bay附近(4号地点)发现得更多。由于马尼拉湾的海水流入量增加,两者在9月大量存在,5月缺席。尽管如此,总体而言,低侵扰率并没有导致帕西格河表生生物的显著空间和时间变化,这可能是由于附近支流的大量废水、明显的藻类水华、表生生物因捕食而分离以及水化学的变化。
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Vorticella and Colacium as epibionts of copepods in Pasig river, Philippines
The chitinous exoskeleton of copepods serves as a scaffold for microepibionts such as protozoa. Although copepods are highly cosmopolitan, their associated epibionts in the tropics are poorly known. This study presents the first account in the Philippines of the ciliate Vorticella on calanoid copepod Arctodiaptomus dorsalis and both Vorticella and the euglenoid Colacium on the cyclopoid copepods Thermocyclops crassus and Mesocyclops microlasius in the Pasig River. Infestation, however, was low at 0.83% (108 out of 13,039) observed copepods from four collection sites in January-May and July-December 2018. Interestingly, Vorticella and Colacium were frequently observed in cyclopoid than on calanoid copepods, predominantly on the urosome, thorax, cephalosome of copepodites and adult stages of copepods. Colacium was also found attached on the antennules, swimming legs, caudal rami and setae. Prevalence of epibionts was site-related; Vorticella being more abundant in waters near Manila Bay (Site 1) where high salinity, conductivity and total dissolved solids were recorded while Colacium was found more near Laguna de Bay (Site 4). Both were abundantly present in September and absent in May, due to increased inflow of seawater from Manila Bay. Nevertheless, overall low infestation resulted in neither significant spatial nor temporal variation of epibiosis in Pasig River, probably due to heavy loadings of wastewater from nearby tributaries, noticeable algal blooms, detachment of epibionts by predations and changes in water chemistry.
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来源期刊
Philippine Journal of Systematic Biology
Philippine Journal of Systematic Biology Environmental Science-Ecology
CiteScore
1.50
自引率
0.00%
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期刊介绍: The Philippine Journal of Systematic Biology (Print ISSN: 1908-6865; Online ISSN: 2508-0342) is an annual, peer-reviewed journal in English that publishes high quality reports of original research and reviews in the field of Taxonomy & Systematics, Ecology and Conservation Biology. The PJSB is a CHED recognized journal under CHED CMO 50 series of 2017. It is also included in the Clavariate Analysis (formerly a subsidiary of Thomson Reuters) Master Journal List under Zoological Record, BIOSIS Previews and Biological Abstracts.The PJSB is the official publication of the Association of Systematic Biologists of the Philippines (SEC Registration: Association of Philippine Taxonomists, Inc.). The organization financially supports the journal and all its endeavors. The journal aims to build up quality information on animal, plant and microbial diversity in the Philippines. Articles dealing with original research or reviews in Zoological, Botanical or Microbial Systematics, Ecology and Conservation Biology are welcome. Authors are advised to consult a recent issue of PJSB for the current format and style. All manuscripts are reviewed by at least two qualified referees.
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