Data Description

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Gallucci, F et al. (2008): (Appendix A) Pigment content, microbial biomass and activity, and grain size characteristics in caged and control sites of the Arctic long-term observatory HAUSGARTEN. doi:10.1594/PANGAEA.847777,
Supplement to: Gallucci, Fabiane; Sauter, Eberhard-Jürgen; Sachs, Oliver; Klages, Michael; Soltwedel, Thomas (2008): Caging experiment in the deep sea: Efficiency and artefacts from a case study at the Arctic long-term observatory HAUSGARTEN. Journal of Experimental Marine Biology and Ecology, 354(1), 39-55, doi:10.1016/j.jembe.2007.10.006
Present theories of deep-sea community organization recognize the importance of small-scale biological disturbances, originated partly from the activities of epibenthic megafaunal organisms, in maintaining high benthic biodiversity in the deep sea. However, due to technical difficulties, in situ experimental studies to test hypotheses in the deep sea are lacking. The objective of the present study was to evaluate the potential of cages as tools for studying the importance of epibenthic megafauna for deep-sea benthic communities. Using the deep-diving Remotely Operated Vehicle (ROV) "VICTOR 6000", six experimental cages were deployed at the sea floor at 2500 m water depth and sampled after 2 years (2y) and 4 years (4y) for a variety of sediment parameters in order to test for caging artefacts. Photo and video footage from both experiments showed that the cages were efficient at excluding the targeted fauna. The cage also proved to be appropriate to deep-sea studies considering the fact that there was no fouling on the cages and no evidence of any organism establishing residence on or adjacent to it. Environmental changes inside the cages were dependent on the experimental period analysed. In the 4y experiment, chlorophyll a concentrations were higher in the uppermost centimeter of sediment inside cages whereas in the 2y experiment, it did not differ between inside and outside. Although the cages caused some changes to the sedimentary regime, they are relatively minor compared to similar studies in shallow water. The only parameter that was significantly higher under cages at both experiments was the concentration of phaeopigments. Since the epibenthic megafauna at our study site can potentially affect phytodetritus distribution and availability at the seafloor (e.g. via consumption, disaggregation and burial), we suggest that their exclusion was, at least in part, responsible for the increases in pigment concentrations. Cages might be suitable tools to study the long-term effects of disturbances caused by megafaunal organisms on the diversity and community structure of smaller-sized organisms in the deep sea, although further work employing partial cage controls, greater replication, and evaluating faunal components will be essential to unequivocally establish their utility.
Median Latitude: 79.071000 * Median Longitude: 4.113550 * South-bound Latitude: 79.070000 * West-bound Longitude: 4.100000 * North-bound Latitude: 79.072000 * East-bound Longitude: 4.127100
Date/Time Start: 1999-07-01T00:00:00 * Date/Time End: 2003-07-27T00:00:00
Minimum DEPTH, sediment/rock: 0.0 m * Maximum DEPTH, sediment/rock: 0.0 m
PS55/001-1 * * Latitude: 79.070000 * Longitude: 4.100000 * Date/Time: 1999-07-01T00:00:00 * Location: Hausgarten * * Campaign: ARK-XV/1 (PS55) * * Basis: Polarstern * * Device: Victor6000 ROV (VICTOR) * * Comment: water depth approx. 2500 m
PS64/435-1 * * Latitude: 79.072000 * Longitude: 4.127100 * Date/Time Start: 2003-07-26T13:00:00 * Date/Time End: 2003-07-27T00:00:00 * Elevation: -2501.0 m * Location: North Greenland Sea * * Campaign: ARK-XIX/3c (PS64) * * Basis: Polarstern * * Device: Remote operated vehicle (ROV) *
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Event label *EventGallucci, Fabiane *
2DEPTH, sediment/rock *DepthmGallucci, Fabiane *Geocode
3Experimental treatment *Exp trtmGallucci, Fabiane *
4Experiment *ExpGallucci, Fabiane *duration
5Time coverage *CoverageGallucci, Fabiane *
6Replicates *Repl#Gallucci, Fabiane *Chl a
7Chlorophyll a *Chl aµg/cm2Gallucci, Fabiane *mean
8Chlorophyll a *Chl aµg/cm2Gallucci, Fabiane *min
9Chlorophyll a *Chl aµg/cm2Gallucci, Fabiane *max
10Coefficient of variation *CVGallucci, Fabiane *Chl a
11Replicates *Repl#Gallucci, Fabiane *Phaeo
12Phaeopigments *Phaeopµg/cm2Gallucci, Fabiane *mean
13Phaeopigments *Phaeopµg/cm2Gallucci, Fabiane *min
14Phaeopigments *Phaeopµg/cm2Gallucci, Fabiane *max
15Coefficient of variation *CVGallucci, Fabiane *Phaeo
16Replicates *Repl#Gallucci, Fabiane *TMB
17Total microbial biomass as carbon per unit sediment volume *TMB/sedµg/cm3Gallucci, Fabiane *mean
18Total microbial biomass as carbon per unit sediment volume *TMB/sedµg/cm3Gallucci, Fabiane *min
19Total microbial biomass as carbon per unit sediment volume *TMB/sedµg/cm3Gallucci, Fabiane *max
20Coefficient of variation *CVGallucci, Fabiane *TMB
21Replicates *Repl#Gallucci, Fabiane *FDA
22Esterase activity per sediment volume *FDAnmol/cm3/hGallucci, Fabiane *mean
23Esterase activity per sediment volume *FDAnmol/cm3/hGallucci, Fabiane *min
24Esterase activity per sediment volume *FDAnmol/cm3/hGallucci, Fabiane *max
25Coefficient of variation *CVGallucci, Fabiane *FDA
26Replicates *Repl#Gallucci, Fabiane *grainz size analysis
27Median, grain size *MedianµmGallucci, Fabiane *mean
28Median, grain size *MedianµmGallucci, Fabiane *min
29Median, grain size *MedianµmGallucci, Fabiane *max
30Coefficient of variation *CVGallucci, Fabiane *median grain size
31Sorting *SortGallucci, Fabiane *mean
32Sorting *SortGallucci, Fabiane *min
33Sorting *SortGallucci, Fabiane *max
34Coefficient of variation *CVGallucci, Fabiane *sorting
35Size fraction < 0.004 mm, clay *<4 µm%Gallucci, Fabiane *mean
36Size fraction < 0.004 mm, clay *<4 µm%Gallucci, Fabiane *min
37Size fraction < 0.004 mm, clay *<4 µm%Gallucci, Fabiane *max
38Coefficient of variation *CVGallucci, Fabiane *Clay
39Silt *Silt%Gallucci, Fabiane *mean
40Silt *Silt%Gallucci, Fabiane *min
41Silt *Silt%Gallucci, Fabiane *max
42Coefficient of variation *CVGallucci, Fabiane *Silt
43Sand *Sand%Gallucci, Fabiane *mean
44Sand *Sand%Gallucci, Fabiane *min
45Sand *Sand%Gallucci, Fabiane *max
46Coefficient of variation *CVGallucci, Fabiane *Sand
860 data points

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