期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
Distribution and influencing factors of microeukaryote in different water layers of the southwestern Indian Ocean Ridge
1
作者 Zhong LI Chao YUAN +4 位作者 Ping SUN Mingzhu FU xuelei ZHANG Zongling WANG qinzeng xu 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2024年第5期1525-1539,共15页
Microeukaryotes play a vital role in shaping marine ecosystems,especially in marine productivity,the microbial food web,and carbon cycle.The Indian Ocean is one of the largest oligotrophic areas in the world,but littl... Microeukaryotes play a vital role in shaping marine ecosystems,especially in marine productivity,the microbial food web,and carbon cycle.The Indian Ocean is one of the largest oligotrophic areas in the world,but little is known about the biodiversity of microeukaryotes in the area.The community composition and geographical distribution of microeukaryotes collected from the surface(SUR)and deep chlorophyll maximum(DCM)layers in the southwestern Indian Ocean were studied using high-throughput sequencing of the 18S rRNA gene.The metagenomic data helped quantify the impact of environmental factors on microeukaryotic communities.The relative abundance of different taxa groups exhibited distinct patterns between SUR and DCM layers,except for the most dominant Dinoflagellata that accounted for more than 40.6%abundance in each sample.Radiolaria was much more abundant in the nutrient-rich DCM layer than the SUR layer.The community similarity of microeukaryotes decreased with increasing of geographic distance,whereas the temperature and inorganic nitrogen were the most important environmental parameters to community structure.Abundant communities were more influenced by dispersal limitations and rare communities were more responsive to environmental factors.Correlation network analyses revealed strong biotic interactions indicative of parasitism,predation and competition,and their contribution to microeukaryotic population in diverse environments.Overall,this study provided insights into the biodiversity of microeukaryotes by characterizing the differences between water layers and identifying the driving factors in the ocean. 展开更多
关键词 microeukaryote southwestern Indian Ocean community structure environmental factor biotic interaction DINOFLAGELLATA
下载PDF
Preliminary analysis of echolocation signals produced by fleeing Irrawaddy dolphins(Orcaella brevirostris)
2
作者 Ying Jiang xuelei Zhang +4 位作者 Zhiguo Yang Saifullah Arifin Jaaman qinzeng xu Azmi Marzuki Muda Hairul Masrini Muhamad 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2019年第1期85-89,共5页
In this study, echolocation signals were recorded from a wild Irrawaddy dolphin(Orcaella brevirostris) in shallow water in the Bay of Brunei. During sound recording, a small fishing boat engine startled a nearby Irraw... In this study, echolocation signals were recorded from a wild Irrawaddy dolphin(Orcaella brevirostris) in shallow water in the Bay of Brunei. During sound recording, a small fishing boat engine startled a nearby Irrawaddy dolphin and began chasing it on two occasions. Variations in the acoustic parameters were detected. When the Irrawaddy dolphin was startled and chased, the sound pressure level, number of click trains per minute, pulse number, and average inter-pulse interval(PI) per click train were all affected. The PI increased and exhibited a slight downward trend during the chase. The increase in PI indicated an increase in the inspection distance as the dolphin escaped. Thus, Irrawaddy dolphins may adapt their echolocation signals to stand out from ambient noise in the wild and to improve their search efforts in potentially risky situations. Appropriate management of the burst noise around the dolphins is important. 展开更多
关键词 CLICK TRAIN ECHOLOCATION SIGNAL Irrawaddy DOLPHIN SIGNAL change
下载PDF
The distribution of phytoplankton size and major influencing factors in the surface waters near the northern end of the Antarctic Peninsula
3
作者 Lu Liu Mingzhu Fu +4 位作者 Kaiming Sun qinzeng xu Zongjun xu xuelei Zhang Zongling Wang 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2021年第6期92-99,共8页
The waters near the Antarctic Peninsula have always been a study hot spot because of their variable and unique oceanographic conditions.To determine the distribution and possible influencing factors on phytoplankton s... The waters near the Antarctic Peninsula have always been a study hot spot because of their variable and unique oceanographic conditions.To determine the distribution and possible influencing factors on phytoplankton size and abundance near the Antarctic Peninsula,a large-scale survey was conducted during the austral summer of2018.Samples were collected in 27 stations located in the Drake Passage(DP),South Shetland Islands(SSI),and South Orkney Islands(SOI).Phytoplankton communities were described using chlorophyll a(Chl a),flow cytometry and light microscopy to cover a size range from pico-to microphytoplankton.Nanophytoplankton,especially small nanophytoplankton(2-6μm)with abundance ranging from 0.66×10^(3) cells/mL to 8.46×10^(3) cells/mL,was predominant throughout the study area.Among different regions,there was an obvious size shift.The proportion of picophytoplankton near the Elephant Island(EI)and DP was higher than other regions,and larger cells were found mainly in east of SOI.The distribution of phytoplankton abundance detected by flow cytometry was not completely consistent with Chl a concentrations due to the contribution of larger cells to Chl a.Possible influencing factors on the phytoplankton size distribution were discussed.The properties of water masses such as temperature and salinity can influence the phytoplankton size distribution.Correlation analysis revealed that only picophytoplankton is significantly correlated with salinity.Light and Fe availability might affect phytoplankton abundance and size distribution especially near the waters of SSI and EI in this study.It was also speculated that the abundance of cryptophytes is possibly related to ice melting. 展开更多
关键词 Antarctic Peninsula phytoplankton size flow cytometry Chl a MICROSCOPY
下载PDF
中国近海多毛纲底栖类群目与科水平的分类 被引量:1
4
作者 葛美玲 徐勤增 +2 位作者 范士亮 王宗兴 张学雷 《生物多样性》 CAS CSCD 北大核心 2018年第9期998-1003,共6页
多毛纲为环节动物重要类群,具有重要的生态与经济意义。多毛纲的分类体系一直处于变化中。本文根据前人支序分类等研究成果,综合《中国动物志》等资料,整理了我国近海多毛纲底栖类群目与科的分类检索。根据Rouse和Fauchald(1997)的分类... 多毛纲为环节动物重要类群,具有重要的生态与经济意义。多毛纲的分类体系一直处于变化中。本文根据前人支序分类等研究成果,综合《中国动物志》等资料,整理了我国近海多毛纲底栖类群目与科的分类检索。根据Rouse和Fauchald(1997)的分类系统,中国近海多毛纲的底栖类群可分为头节虫目(Scolecida)、海稚虫目(Spionida)、蛰龙介目(Terebellida)、缨鳃虫目(Sabellida)、叶须虫目(Phyllodocida)和矶沙蚕目(Eunicida)。基于头部、躯干部等附属物形态特征,整理建立了中国近海多毛纲底栖类群上述六目至科的分类检索表,考证了该分类方法,总结了近年来我国近海多毛纲的研究和分子生物学对多毛纲系统演化的贡献。 展开更多
关键词 多毛纲 底栖生物 分类检索 系统演化
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部