Spatial distribution patterns of ascidians (Ascidiacea: Tunicata) on the continental shelves off the northern Antarctic Peninsula
Spatial distribution patterns of ascidians (Ascidiacea: Tunicata) on the continental shelves off the northern Antarctic Peninsula
复制标题
南极半岛北部大陆架海鞘类(Ascidiacea:Tunicata)的空间分布格局
DOI:
10.1007/s00300-016-1909-y
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发表时间:
2016
期刊:
影响因子:
1.7
通讯作者:
Piepenburg
中科院分区:
文献类型:
--
作者:
Segelken-Voigt;Bracher;Dorschel;Huneke;Piepenburg
Ascidians (Ascidiacea: Tunicata) are sessile suspension feeders that represent dominant epifaunal components of the Southern Ocean shelf benthos and play a significant role in the pelagic–benthic coupling. Here, we report the results of a first study on the relationship between the distribution patterns of eight common and/or abundant (putative) ascidian species, and environmental drivers in the waters off the northern Antarctic Peninsula. During RVPolarsterncruise XXIX/3 (PS81) in January–March 2013, we used seabed imaging surveys along 28 photographic transects of 2 km length each at water depths from 70 to 770 m in three regions (northwestern Weddell Sea, southern Bransfield Strait and southern Drake Passage), differing in their general environmental setting, primarily oceanographic characteristics and sea-ice dynamics, to comparatively analyze the spatial patterns in the abundance of the selected ascidians, reliably to be identified in the photographs, at three nested spatial scales. At a regional (100-km) scale, the ascidian assemblages of the Weddell Sea differed significantly from those of the other two regions, whereas at an intermediate 10-km scale no such differences were detected among habitat types (bank, upper slope, slope, deep/canyon) on the shelf and at the shelf break within each region. These spatial patterns were superimposed by a marked small-scale (10-m) patchiness of ascidian distribution within the 2-km-long transects. Among the environmental variables considered in our study, a combination of water-mass characteristics, sea-ice dynamics (approximated by 5-year averages in sea-ice cover in the region of or surrounding the photographic stations), as well as the seabed ruggedness, was identified as explaining best the distribution patterns of the ascidians.
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影响因子:
1.6
作者:
M. Tatián;R. Sahade;M. Doucet;G. Esnal
通讯作者:
G. Esnal
DOI:
10.1111/j.1439-0485.1993.tb00364.x
发表时间:
1993
期刊:
Marine Ecology
影响因子:
--
作者:
I. Svane;J. Havenhand
通讯作者:
J. Havenhand
影响因子:
1.8
作者:
K. Newton;B. Creese;D. Raftos
通讯作者:
D. Raftos
影响因子:
1.7
作者:
J. Gili;R. Coma;C. Orejas;P. López;M. Zabala
通讯作者:
M. Zabala
影响因子:
1.7
作者:
Dorschel, B.;Gutt, J.;Herr, H.
通讯作者:
Herr, H.