气候变化领域集成服务门户(CCPortal): Near-bottom zooplankton aggregations in Kongsfjorden with link to images from the optical zooplankton sensor MOKI

CCPortal

DOI	https://doi.org/10.1594/PANGAEA.840353
	Near-bottom zooplankton aggregations in Kongsfjorden with link to images from the optical zooplankton sensor MOKI
	Hirche; Hans-Jürgen; Laudien; Jürgen; Buchholz; Friedrich
发布日期	2015-10-13
数据集类型	dataset
英文简介	Near-bottom zooplankton communities have rarely been studied despite numerous reports of high zooplankton concentrations, probably due to methodological constraints. In Kongsfjorden, Svalbard, the near-bottom layer was studied for the first time by combining daytime deployments of a remotely operated vehicle (ROV), the optical zooplankton sensor moored on-sight key species investigation (MOKI), and Tucker trawl sampling. ROV data from the fjord entrance and the inner fjord showed high near-bottom abundances of euphausiids with a mean concentration of 17.3 ± 3.5 n/100 m3. With the MOKI system, we observed varying numbers of euphausiids, amphipods, chaetognaths, and copepods on the seafloor at six stations. Light-induced zooplankton swarms reached densities in the order of 90,000 (euphausiids), 120,000 (amphipods), and 470,000 ind/m3 (chaetognaths), whereas older copepodids of Calanus hyperboreus and C. glacialis did not respond to light. They were abundant at the seafloor and 5 m above and showed maximum abundance of 65,000 ind/m3. Tucker trawl data provided an overview of the seasonal vertical distribution of euphausiids. The most abundant species Thysanoessa inermis reached near-bottom concentrations of 270 ind/m3. Regional distribution was neither related to depth nor to location in the fjord. The taxa observed were all part of the pelagic community. Our observations suggest the presence of near-bottom macrozooplankton also in other regions and challenge the current view of bentho-pelagic coupling. Neglecting this community may cause severe underestimates of the stock of elagic zooplankton, especially predatory species, which link secondary production with higher trophic levels.
空间范围	Median Latitude: 78.946018 * Median Longitude: 12.087877 * South-bound Latitude: 78.910250 * West-bound Longitude: 11.499950 * North-bound Latitude: 78.979920 * East-bound Longitude: 12.322120
时间范围	2012-09-05T14:01:00 - 2012-09-08T15:13:00
语种	英语
国家	国际
学科大类	气候变化
学科子类	气候变化
文献类型	数据集
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/217221
推荐引用方式 GB/T 7714	Hirche,Hans-Jürgen,Laudien,et al. Near-bottom zooplankton aggregations in Kongsfjorden with link to images from the optical zooplankton sensor MOKI.2015-10-13.https://doi.org/10.1594/PANGAEA.840353.