Activity of appendages (Gill and Crisp, a; Gill and Poulet, ,a). .. Temora longicornis Undeuchaeta plumosa Undinula vulgaris l? biloba P. LB-B is financially supported by a PhD grant of the “III Plan Regional de I+D+I del Principado de Asturias”. The work was supported by the EU in the framework. activity of appendages (Gill and Crisp, a; Gill and Poulet, ,a). .. Temora longicornis Undeuchaeta plumosa Undinula vulgaris l? biloba P m depth in association with a hydrothermal plume on the Juan de Fuca Ridge.
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No flowmeter was used, assuming the volume of filtered water as the entire column. The other codends were set aside for other experiments. In the laboratory, the zooplankton were identified to species level in most cases, and counted under plumosa de poulet stereomicroscope.
Both classification and ordination procedures were employed to group samples with similar zooplankton composition.
Cluster analysis was based on the Bray—Curtis similarity measure and average linkage classification. Similarity level was adjusted to obviously meaningful groupings, rather than forcing clusters to a fixed level Hunt et al. Moreover, the similarity matrix was ordinated using non-metric multidimensional scaling NMDS in a two-axis ordination.
Plumosa de poulet combination of clustering and ordination analysis allows evaluation of the adequacy and mutual consistency of both representations Clarke and Warwick, The ordination scores of the NMDS, which summarize the zooplankton community in terms of the abundance data, were regressed against sea surface temperature, average temperature, average salinity, and integrated Chl a concentration, to determine the effect of these variables on community structure.
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The abundance of the taxa responsible for most of the similarity within groups and dissimilarity between groups was tested against the environmental variables by regression analysis, to check the affinity of the taxa for different plumosa de poulet conditions.
Differences between particular groups in sea surface temperature, integrated Chl a concentration, and salinity were checked by applying t -tests owing to the heterogeneity of variances.
When multiple tests were carried out, sequential Bonferroni correction was applied Rice, During OMEX, upwelling conditions prevailed, the upper water column being cooler near the coast than at oceanic stations.
Coastal waters were slightly plumosa de poulet than oceanic waters, so there was a thermohaline stratification. In autumn OMEXthe thermohaline structure was characterized by the warm, plumosa de poulet poleward current flowing over the upper slope, at depths of 60— m.
Freshwater inputs were higher than in the summer cruise, affecting the entire water column at some stations. Chl a concentration was lower than during upwelling.
The entrance plumosa de poulet the euphotic zone of deep, nutrient-rich water associated with this upwelling enhances primary production Joint et al. On the other hand, a warm, saline current flowing polewards along plumosa de poulet slope appears to be the main hydrographic feature of the waters off NW Spain during autumn and winter Frouin et al.
At the same time, a reversal of the meridional component of the wind to a northward direction induces onshore Ekman transport Frouin et al.
However, information on the mesozooplankton community composition remains limited. Consequently, given that mesoscale hydrographic events, and the interactions and exchanges between open ocean and continental shelf waters, affect the spatial distribution and composition of plumosa de poulet, environmental changes play an essential role in biogeochemical cycles Pinca and Dallot, ; Pakhomov and Perissinotto, ; Grunewald et al.
Moreover, shelf and oceanic sites plumosa de poulet different zooplankton compositions Siokou-Frangou et al.
The differences in the responses plumosa de poulet these changes could be another source of variation. The objective of this work was to analyse the variations in zooplankton species abundance in response to two different hydrographic conditions: Further, the influence of both on coastal and oceanic areas is analysed, with the purpose of detecting differences in the influence of the hydrographic events close to the coast and farther offshore.
The work contributes to knowledge of the mesozooplankton community under different hydrographic conditions in the study area, an area where most earlier studies were carried out during upwelling events.
Material and methods Study area and sampling The data used for the study were obtained during two oceanographic cruises carried out off NW Spain: The plumosa de poulet six stations were sampled on each cruise Figure 1by day and by night, except for Station 1 in and Station 16 inwhich were only sampled by day.
Figure 1 Map of the study area and the stations sampled during both cruises.
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Figure 1 View large Download slide Map of the study area and the stations sampled during both cruises. Zooplankton samples were taken with vertical hauls from m, or from near the bottom in shallower water, to the surface.
Although different nets were used on the two cruises, we consider that this fact did not influence the results, because both abundance and biomass were higher during OMEX cm diameter net plumosa de poulet, when the gear would have been less efficient than if the cm diameter plumosa de poulet had been used, as it was during OMEX Sameoto et al.
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Therefore, if there was any effect, it would have contributed to reducing the differences between both years. In particular, the "cutlet Kiev-style" plumosa de poulet to be renamed into "chicken cutlet stuffed with butter".