Plankton & Benthos Research最新文献_第8页

Holothurian assemblages before the harvest-boom era in inner reefs of Ishigaki Island, focusing on population dynamics of lollyfish Holothuria atra Jäger, 1833 石垣岛内礁收获繁荣时代之前的Holothurian群落，关注棒棒龙虾的种群动态Holothuria atra Jäger，1833年

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-08-06 DOI: 10.3800/pbr.16.165

S. Nishihama, I. Tanita

{"title":"Holothurian assemblages before the harvest-boom era in inner reefs of Ishigaki Island, focusing on population dynamics of lollyfish Holothuria atra Jäger, 1833","authors":"S. Nishihama, I. Tanita","doi":"10.3800/pbr.16.165","DOIUrl":"https://doi.org/10.3800/pbr.16.165","url":null,"abstract":"Distribution and abundance of holothurians before the boom of fisheries in the 1990s were analyzed in relation to types of bottom sediment and biomes in inner reefs of Ishigaki Island, Okinawa, Japan. The data had been collected continuously over three years at Yoshihara and once at three other sites. Fifteen species were found, among which the dominant Holothuria atra and Stichopus chloronotus were abundant on bottoms with sand and seagrass, and those with sand and coral cobbles, respectively. The continuous survey at Yoshihara revealed that the overall density of H. atra was 2 to 3 ind. m−2, which was the highest among values reported previously, and spatial-temporal distribution of H. atra was almost stable throughout the research period, but the distribution of St. chloronotus fluctuated irregularly. The density of H. atra fluctuated seasonally (high in winter and low in summer) and was correlated negatively with air temperature and irradiation, and positively with cloud cover. The body length of H. atra became longer in summer and shorter in winter. The frequency of asexual reproduction (fission) was estimated at less than 1% of annual recruitment, and the growth rate was estimated to be low (K=0.0845 in von Bertalanffy equation). The high density and slow growth suggested that the H. atra population had reached carrying capacity at Yoshihara. The sandcoated ratio of H. atra was positively correlated with wind speed, however, no trend was found with the spatial-temporal variation in the density and distribution of the sand-coated individuals.","PeriodicalId":56054,"journal":{"name":"Plankton & Benthos Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47089687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Impact of seasonal hypoxia on benthic copepod communities in Omura Bay, a highly enclosed coastal sea in southwestern Japan 季节性缺氧对日本西南部高度封闭沿海大村湾底栖桡足动物群落的影响

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.93

Kazuki Kawano, M. Shimanaga, R. Ueda, Quyen T. D. Nguyen, M. Wada

{"title":"Impact of seasonal hypoxia on benthic copepod communities in Omura Bay, a highly enclosed coastal sea in southwestern Japan","authors":"Kazuki Kawano, M. Shimanaga, R. Ueda, Quyen T. D. Nguyen, M. Wada","doi":"10.3800/PBR.16.93","DOIUrl":"https://doi.org/10.3800/PBR.16.93","url":null,"abstract":": Declining oxygen concentrations in aquatic habitats represent extreme conditions that threaten benthic life. Hypoxia has recently become an important research topic, as areas aﬀected by these phenomena are spreading glob -ally. Omura Bay is one of the most highly enclosed seas in Japan, and severely hypoxic conditions occur at the bottom every summer. We conducted a preliminary study in the center of the bay to evaluate how seasonal hypoxia aﬀects the abundance and community composition of benthic meiofauna, with particular reference to copepods. The copepod densities and their nauplii diﬀered signiﬁcantly among seasonal categories (before, during, and after hypoxia). Further more, the degree of the seasonal decline in copepods during hypoxia seemed much more severe than that in nematodes, the most abundant meiofauna. The assemblages of adult copepods had the simplest composition during hypoxia, when harpacticoid copepods in the family Cletodidae, which have smaller and slender bodies, occurred at signiﬁcantly higher frequencies (a contribution of 84% to the mean similarity among seasons). After hypoxia, the relative abundance of copepods in the families Ectinosomatidae and Longipediidae increased, which may likely be attributed to their higher swimming abilities and rapid recruitment via speciﬁc planktonic nauplius stages, respectively. High frequencies of co pepods in the Cletodidae family have also been observed under hypoxic conditions in the Mediterranean Sea, suggest ing that similar processes aﬀect benthic copepod communities, which work to the advantage of cletodid species with small and slender forms in the subtidal sediment bottom under severe hypoxia in Omura Bay and other regions.","PeriodicalId":56054,"journal":{"name":"Plankton & Benthos Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42508373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Planktonic larvae of the rare spoon worm, Ikedosoma elegans (Annelida: Thalassematidae), collected from Tanabe Bay, Wakayama, Japan 罕见的匙形线虫Ikedosoma elegans的浮游生物幼虫（环节动物纲：Thalassematidae），采集于日本和歌山田边湾

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.149

K. Koizumi, T. Nakano, A. Asakura

引用次数: 0

Morphological and molecular analyses of Blackfordia sp. (Hydrozoa: Leptothecata) newly discovered in Vietnam 越南新发现的黑狐属(水螅虫:细肢纲)的形态和分子分析

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.118

A. Iida, D. Lindsay, T. M. Ha, Mitsuko Hidaka, S. Toshino, Y. Kondo, S. Ohtsuka, J. Nishikawa

引用次数: 2

First record of Kamaka corophina Ren & Sha, 2013 (Crustacea: Amphipoda: Kamakidae) in Japan 日本Kamaka corophina Ren & Sha首次记录，2013(甲壳纲:片足纲:镰足科)

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.84

H. Ariyama

引用次数: 0

Use of environmental DNA to survey the distribution of the invasive mussel Limnoperna fortunei in farm ponds 利用环境DNA调查入侵贻贝在养殖池塘中的分布

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.100

Kenji Ito, H. Shibaike

{"title":"Use of environmental DNA to survey the distribution of the invasive mussel Limnoperna fortunei in farm ponds","authors":"Kenji Ito, H. Shibaike","doi":"10.3800/PBR.16.100","DOIUrl":"https://doi.org/10.3800/PBR.16.100","url":null,"abstract":": The golden mussel Limnoperna fortunei (Dunker, 1857) is an invasive freshwater bivalve species that exerts harmful eﬀects on the environment, as well as man-made structures, such as water-treatment systems. By using conventional sampling methods, it is diﬃcult to detect mussels under low-density conditions; however, environmental DNA (eDNA) analysis may be a rapid and eﬃcient method for monitoring this aquatic organism. In this study, we conducted surveys based on the eDNA analysis of L. fortunei in 15 farm ponds in Japan and compared the results with those of two conventional survey methods, visual census and plankton larval survey, to clarify the eﬀectiveness of eDNA analysis for ﬁeld surveys of L. fortunei . Primers and a probe speciﬁc to L. fortunei were developed, and a method for analysis was established. In the laboratory experiments, the species eDNA was detected in all water tanks containing the mussels, and the concentration of eDNA was high in the experimental tank that had high density of L. fortunei . In the ﬁeld survey, L. fortunei eDNA was detected in all ponds where the mussels were found by conventional survey, and low concentrations of eDNA were also detected in several ponds where no L. fortunei were found by traditional methods. These results suggest that eDNA analysis has greater sensitivity for the detection of L. fortunei in farm ponds than that of conventional methods. Environmental DNA surveys have little impact on water management and are suitable for surveys at water facilities that have not yet been damaged by the mussels.","PeriodicalId":56054,"journal":{"name":"Plankton & Benthos Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45097834","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Tiaricodon orientalis sp. nov., a new species (Hydrozoa, Anthoathecata, Halimedusidae) from Sagami Bay, eastern Japan 日本东部相模湾一新种(水螅动物，花纲，水母科)——东方Tiaricodon orientalis sp. nov

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.129

Gaku Yamamoto, S. Toshino

引用次数: 1

Ingestion of microplastics by free-living marine nematodes, especially Enoplolaimus spp., in Mallipo Beach, South Korea 在韩国马利波海滩，自由生活的海洋线虫，特别是Enoplolaimus spp.摄入微塑料

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.109

Teawook Kang, Dongsung Kim, Je Hyeok Oh

{"title":"Ingestion of microplastics by free-living marine nematodes, especially Enoplolaimus spp., in Mallipo Beach, South Korea","authors":"Teawook Kang, Dongsung Kim, Je Hyeok Oh","doi":"10.3800/PBR.16.109","DOIUrl":"https://doi.org/10.3800/PBR.16.109","url":null,"abstract":": Many plastics cause pollution in the marine environment, with microplastics (0.1 µ m–5 mm) representing a key research focus. The number of microplastics in sediments may increase rapidly, aﬀecting organisms inhabiting marine sediments. The aim of this study was to determine how microplastics aﬀect nematodes in intertidal sand. We assessed: (1) intake of microplastic particles (10 µ m, 5 µ m, 1 µ m, or 0.5 µ m) by Enoplolaimus spp. over 48 h; (2) microplastic intake by nematodes depending on feeding type (selective deposit feeders, non-selective deposit feeders, epistrate feeders, or predators/omnivores) over 48 h; and (3) microplastic egestion by Enoplolaimus spp. The proportion of Enoplolaimus spp. individuals containing microplastics was signiﬁcantly less in the 10- µ m microplastic treatment than in the treatments where Enoplolaimus spp. were exposed to microplastic particles of smaller sizes (5 µ m, 1 µ m, or 0.5 µ m). The ingestion rates of microplastics by predators/omnivores, non-selective deposit feeders, and selective deposit feeders increased as the size of the microplastic decreased. After transferring Enoplolaimus spp. to ﬁltered seawater following microplastic ingestion, the proportion of Enoplolaimus spp. individuals containing the smallest size microplastic (0.5 µ m) decreased by 15% of the ingested amount in 3 days. In conclusion, there was a signiﬁcant diﬀer ence among microplastic-size treatments, but not among feeding types or in the interaction between microplastic size and feeding type. The size of microplastics, rather than feeding type of nematodes, impacted ingestion rates. It is pos-sible that microplastics in the sediment are ingested by living in marine ecosystems.","PeriodicalId":56054,"journal":{"name":"Plankton & Benthos Research","volume":" ","pages":""},"PeriodicalIF":0.6,"publicationDate":"2021-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46322553","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Nectonemertes mirabilis (Nemertea: Hoplonemertea: Pelagica) from deep waters of the Gulf of Mexico, first sighting of a pelagic nemertean in the gulf 从墨西哥湾的深水中发现的神奇Nectonemertes (Nemertea: Hoplonemertea: Pelagica)，首次在海湾中发现了远洋nemertes

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.139

M. VIOLANTE-HUERTA, L. Sanvicente-Añorve

引用次数: 0

Bioluminescence of the polychaete Tharyx sp. (Annelida: Cirratulidae) in deep-seawater from Toyama Bay, Japan 日本富山湾深海水中多毛纲动物的生物发光

IF 0.6 4区生物学

Plankton & Benthos Research Pub Date : 2021-05-27 DOI: 10.3800/PBR.16.145

Ikuhiko Kin, Naoto Jimi, Gaku Mizuno, Hidenobu Koike, Y. Oba

引用次数: 1