Publication Date:
2023-12-13
Description:
Megafauna plays an important role in benthic ecosystems and contributes significantly to benthic biomass in the Arctic. The distribution is mostly studied using towed cameras. Here, we compare the megafauna from two sites located at different distances from the Kongsfjord: one station at the entrance to the fjord, another on the outer shelf. Although they are only located 25 km apart and at comparable depth, there were significant differences in their species composition. While the inshore station was characterized by shrimps (2.57 +/- 2.18 ind./m**2) and brittlestars (3.21 +/- 3.21 ind./m**2), the offshore site harboured even higher brittlestar densities (15.23 +/- 9.32 ind./m**2) and high numbers of the sea urchin Strongylocentrotus pallidus (1.23 +/- 1.09 ind./m**2). Phytodetrital concentrations of the upper sediment centimetres were significantly higher inshore compared with offshore. At a smaller scale, there were also differences in the composition of different transect sections. Several taxa were characterized by a patchy distribution along transects. We conclude that these differences were caused primarily by habitat characteristics. The seafloor inshore was characterized by glacial soft sediments, whereas the station offshore harboured large quantities of stones. Although the use of a new web-2.0-based tool, BIIGLE (http://www.BIIGLE.de), allowed us to analyse more images (~90) than could have been achieved by hand, taxon area curves indicated that the number of images analysed was not sufficient to capture the species inventory fully. New automated image analysis tools would enable a rapid analysis of larger quantities of camera footage.
Keywords:
Actiniaria; Actiniaria, standard deviation; Actiniidae; Actinostolidae; Alcyonacea; Alcyonacea, standard deviation; Amblyraja radiata; Amblyraja radiata, standard deviation; Amphicteis gunneri; Amphipoda; Amphipoda, standard deviation; Anarhichas minor; Anarhichas minor, standard deviation; Anobothrus gracilis; Anthozoa; Anthozoa, standard deviation; Area/locality; Aristias tumidus; ARK-XXIII/2; Arrhis phyllonyx; Artacama proboscidea; Artediellus atlanticus; Artemisina apollinis; Artemisina apollinis, standard deviation; Ascidiacea; Ascidiacea, standard deviation; Astarte montagui; Asteroidea; Asteroidea, standard deviation; AWI; Brada granulosa; Brada inhabilis; Branchiomma sp.; Bylgides elegans; Bylgides groenlandicus; Capitella capitata; Caridea; Caridea, standard deviation; Ceriantharia; Ceriantharia, standard deviation; Chaetozone spp.; Chirimia biceps; Chlamys islandica; Chone sp.; Ciliatocardium ciliatum; Cirratulus sp.; Colossendeis proboscidea; Colossendeis proboscidea, standard deviation; Colus sabini; Coryphella salmonacea; Crossaster papposus; Crossaster papposus, standard deviation; Crustacea; Crustacea, standard deviation; Cryptonatica affinis; Ctenodiscus crispatus; Cylichna sp.; Dendrobeania cf. fruticosa; Eteone flava; Eteone foliosa; Eunoe nodosa; Euphrosine sp.; Eupyrgus scaber; Event label; Frigidoalvania janmayeni; Gadus morhua; Gadus morhua, standard deviation; Gastropoda; Gastropoda, standard deviation; Gattyana cirrhosa; Gersemia rubiformis; Gersemia rubiformis, standard deviation; Golfingia margaritacea; Gymnelus sp.; Halecium muricatum; Halecium scutum; Halirages fulvocincta; Haploops sp.; Harmothoe sp.; Henricia perforata; Heteromastus filiformis; Hiatella sp.; Hippoglossoides platessoides; Hippoglossoides platessoides, standard deviation; Hormathia digitata; Hormathia nodosa; Hyas spp.; Hyas spp., standard deviation; Icasterias panopla; Icasterias panopla, standard deviation; International Polar Year (2007-2008); IPY; Jasmineira cf. schaudinni; Laonice cf. cirrata; Laonice sp.; Leitoscoloplos mammosus; Lepeta caeca; Leptochiton sp.; Lumbrinereidae; Lumpenus lampretaeformis; Lumpenus lampretaeformis, standard deviation; Lycodes gracilis; Lysippe labiata; Maldane cf. arctica; Maldane sarsi; Maldanidae; Method comment; MF; Microcionidae; Multi frame; Munnopsis typica; Myriapora coarctata; Myriapora coarctata, standard deviation; Myriochele cf. oculata; Myriochele heeri; Myxilla sp.; Nemertea; Neoamphitrite affinis; Nephasoma diaphanes; Nephtys ciliata; Neptunea despecta; Nicomache lumbricalis; Nothria conchylega; Nuculana pernula; Nymphon hirtipes; Oedicerotidae; Oenopota sp.; OFOS photographic survey with BIIGLE analysis; Ophiacantha bidentata; Ophiopholis aculeata; Ophiura robusta; Ophiura sarsi; Ophiuroidea; Ophiuroidea, standard deviation; Pandalus sp.; Paramphithoe hystrix; Pedicellaster typicus; Phascolion strombi; Pherusa sp.; Philine finmarchica; Pholoe cf. assimilis; Phoxocephalus holbolli; Pisces; Pisces, standard deviation; Polarstern; Polynoidae; Porifera; Porifera, standard deviation; Praxillura longissima; Prionospio sp.; PS72; PS72/106-4; PS72/107-4; Pteraster cf. pulvillus; Sabellidae; Sclerocrangon sp.; Scoletoma fragilis; Sepiolidae; Serpulidae; Serpulidae, standard deviation; Similipecten greenlandicus; Solariella obscura; Spiochaetopterus typicus; Spiophanes kroeyeri; Stegocephalopsis ampulla; Stegopoma plicatile; Strongylocentrotus pallidus; Strongylocentrotus pallidus, standard deviation; Syllis cornuta; Tachyrhynchus reticulatus; Tedania suctoria; Terebellides sp.; Themisto sp.; Volutopsius norwegicus; Yoldiella propinqua; Yoldiella solidula; Zoarcidae; Zoarcidae, standard deviation
Type:
Dataset
Format:
text/tab-separated-values, 392 data points
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