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Bergmann, Melanie; Soltwedel, Thomas; Klages, Michael (2011): (Table 2) Megafauna density 2002, 2004 and 2007 in the deep-sea observatory AWI-HAUSGARTEN, Fram Strait. PANGAEA, https://doi.org/10.1594/PANGAEA.807446, Supplement to: Bergmann, M et al. (2011): The interannual variability of megafaunal assemblages in the Arctic deep sea: Preliminary results from the HAUSGARTEN observatory (79°N). Deep Sea Research Part I: Oceanographic Research Papers, 58(6), 711-723, https://doi.org/10.1016/j.dsr.2011.03.007

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Abstract:
Although megafaunal organisms play an important role in deep benthic ecosystems and contribute significantly to benthic biomass in the Arctic little is known about their temporal dynamics. Here, we assessed the interannual dynamics of megafaunal organisms from the HAUSGARTEN observatory in the Fram Strait, an area where the effects of climatic forcing are particularly evident. We analysed three congruent camera transects taken in 2002, 2004 and 2007. Environmental parameters were measured in order to be able to put our faunal results into an environmental context.
Our results indicate that although the densities of megafaunal species show different patterns over time, most exhibit an overall decrease between 2002 and 2007 and total megafaunal densities decreased regularly from 2002 to 2004 to 2007 (12.16 +/- 0.96 to 7.41 +/- 0.43 ind/m**2). This concurs with a steady increase in bottom-water temperatures and a decrease in the total organic content and microbial biomass of surficial sediments at the same time period. Although suspension feeder densities also decreased, predator/scavenger and deposit feeder densities have declined to such an extent that suspension feeders accounted for almost 100% of the megafauna in 2007. It could thus be argued that the trophic diversity at the central HAUSGARTEN station (2500 m) has decreased. Temperature-related changes in the production of the surface layers may lead to changes in the quality and/or quantity of particles exported to the deep seafloor. The densities of deposit feeders (i.e. holothurians) peaked (1.14 +/- 0.13 ind/m**2) in 2004, the year following the longest ice cover. These results indicate the importance of ice-related export of particles to the deep seafloor and highlight the need for time-series transects, especially in an era when productive marginal ice zones tend to disappear with the receding sea ice. Although there is a general consensus that the Arctic is in a transition towards a warmer state, only continued observation will allow us to assess if the interannual changes observed are a result of decadal cycles related to the Arctic and North Atlantic Oscillation or if they are indicators of long-term change.
Coverage:
Median Latitude: 79.064633 * Median Longitude: 4.289900 * South-bound Latitude: 79.064400 * West-bound Longitude: 4.287000 * North-bound Latitude: 79.064900 * East-bound Longitude: 4.295200
Date/Time Start: 2002-08-03T05:02:00 * Date/Time End: 2007-07-13T02:38:00
Minimum DEPTH, sediment/rock: m * Maximum DEPTH, sediment/rock: m
Event(s):
PS62/161-3 * Latitude: 79.064400 * Longitude: 4.287500 * Date/Time: 2002-08-03T05:02:00 * Elevation: -2416.0 m * Location: North Greenland Sea * Campaign: ARK-XVIII/1 (PS62) * Basis: Polarstern * Method/Device: Ocean Floor Observation System (OFOS)
PS66/120-1 * Latitude: 79.064600 * Longitude: 4.295200 * Date/Time: 2004-07-10T02:53:00 * Elevation: -2406.0 m * Campaign: ARK-XX/1 (PS66) * Basis: Polarstern * Method/Device: Ocean Floor Observation System (OFOS)
PS70/170-1 * Latitude: 79.064900 * Longitude: 4.287000 * Date/Time: 2007-07-13T02:38:00 * Elevation: -2422.0 m * Location: North Greenland Sea * Campaign: ARK-XXII/1c (PS70) * Basis: Polarstern * Method/Device: Ocean Floor Observation System (OFOS)
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEvent
2Sampling dateSampling dateBergmann, Melanie
3DEPTH, sediment/rockDepth sedmGeocode
4Caulophacus arcticusC. arcticus#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
5Caulophacus arcticus, standard deviationC. arcticus std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
6Cladorhiza gelidaC. gelida#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
7Cladorhiza gelida, standard deviationC. gelida std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
8PoriferaPorifera#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysissmall round sponge
9Porifera, standard deviationPorifera std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysissmall round
10Porifera indeterminataPorifera indet#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
11Porifera, standard deviationPorifera std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysisindeterminata
12Gersemia fruticosaG. fruticosa#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
13Gersemia fruticosa, standard deviationG. fruticosa std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
14Bathyphellia margaritaceaB. margaritacea#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysisspecies questionable
15Bathyphellia margaritacea, standard deviationB. margaritacea std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
16ActiniariaActiniaria#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysislarge purple actinian
17Actiniaria, standard deviationActiniaria std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysislarge purple actinian
18ActiniariaActiniaria#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
19Actiniaria, standard deviationActiniaria std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
20NemerteaNemertea#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysisflattish worm, questionable
21Nemertea, standard deviationNemertea std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
22Mohnia spp.Mohnia spp.#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
23Mohnia spp., standard deviationMohnia spp. std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
24GastropodaGastropoda#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
25Gastropoda, standard deviationGastropoda std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
26Ascorhynchus abyssiA. abyssi#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
27Ascorhynchus abyssi, standard deviationA. abyssi std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
28Verum striolatumV. striolatum#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
29Verum striolatum, standard deviationV. striolatum std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
30AmphipodaAmphipoda#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
31Amphipoda, standard deviationAmphipoda std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
32Crustacea indeterminataCrustacea indet#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysisburrowing crustacean cf. Arcturidae
33Crustacea, standard deviationCrustacea std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysisburrowing crustacean cf. Arcturidae
34Saduria megaluraS. megalura#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
35Saduria megalura, standard deviationS. megalura std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
36IsopodaIsopoda#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
37Isopoda, standard deviationIsopoda std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
38Bythocaris spp.Bythocaris spp.#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
39Bythocaris spp., standard deviationBythocaris spp. std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
40CrustaceaCrustacea#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
41Crustacea, standard deviationCrustacea std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
42Bathycrinus carpenteriiB. carpenterii#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
43Bathycrinus carpenterii, standard deviationB. carpenterii std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
44ComatulidaComatulida#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
45Comatulida, standard deviationComatulida std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
46Hymenaster pellucidusH. pellucidus#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
47Hymenaster pellucidus, standard deviationH. pellucidus std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
48AsteroideaAsteroidea#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
49Asteroidea, standard deviationAsteroidea std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
50Kolga hyalinaK. hyalina#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
51Kolga hyalina, standard deviationK. hyalina std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
52Elpidia heckeriE. heckeri#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
53Elpidia heckeri, standard deviationE. heckeri std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
54Pourtalesia jeffreysiP. jeffreysi#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
55Pourtalesia jeffreysi, standard deviationP. jeffreysi std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
56Lycodes frigidusL. frigidus#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
57Lycodes frigidus, standard deviationL. frigidus std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
58Megafauna abundanceMegaf#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
59Megafauna, standard deviationMegafauna std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
60StonesStones#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis(drop-)stone
61Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis(drop-)stone
62BurrowsBurrows#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysisburrow entrance
63Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysisburrows
64Bathycrinus spp.Bathycrinus spp.#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysisstalk
65Bathycrinus spp., standard deviationBathycrinus spp. std dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
66Evenness of speciesEBergmann, MelanieOFOS photographic survey with BIIGLE analysis
67Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysisevenness
68DiversityH(S)Bergmann, MelanieOFOS photographic survey with BIIGLE analysisH loge
69Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysisdiversity
70Suspension feeder abundanceSusp feeder abund#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
71Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysissusp feeders
72Deposit feeder abundanceDepos feeder abund#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysis
73Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysisdepos feeders
74Predator abundancePred#/m2Bergmann, MelanieOFOS photographic survey with BIIGLE analysisincluding scavengers
75Standard deviationStd dev±Bergmann, MelanieOFOS photographic survey with BIIGLE analysispredators/scavengers
Size:
219 data points

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