Browsing Bergen Open Research Archive by Author "Rapp, Hans Tore"
Now showing items 1-20 of 30
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Benthic Communities on the Mohn’s Treasure Mound: Implications for Management of Seabed Mining in the Arctic Mid-Ocean Ridge
Ramirez-Llodra, Eva; Hilário, Ana; Paulsen, Emil; Costa, Carolina; Bakken, Torkild; Johnsen, Geir; Rapp, Hans Tore (Journal article; Peer reviewed, 2020)The Mohn’s Treasure, described as an inactive sulfide mound, was discovered at 2,600-m depth on the Arctic Mid-Ocean Ridge (AMOR) in 2002. In 2015, we conducted the first biological survey of Mohn’s Treasure using remotely ... -
The cladorhizid fauna (Porifera, Poecilosclerida) of the Caribbean and adjacent waters
Hestetun, Jon Thomassen; Pomponi, Shirley A.; Rapp, Hans Tore (Peer reviewed; Journal article, 2016-10-19)The carnivorous sponge family Cladorhizidae has been subject to several recent studies, yet the cladorhizid fauna of the Caribbean and adjacent areas remain comparatively poorly known. In this article we provide a description ... -
Deep-Sea Carnivorous Sponges From the Mariana Islands
Hestetun, Jon Thomassen; Rapp, Hans Tore; Pomponi, Shirley (Peer reviewed; Journal article, 2019-07-10)Carnivorous sponges belonging to family Cladorhizidae (Porifera, Demospongiae, Poecilosclerida) are unique within phylum Porifera due to their ability to capture and envelop small prey. While other sponges use an aquiferous ... -
Demosponges from the Northern Mid-Atlantic Ridge shed more light on the diversity and biogeography of North Atlantic deep-sea sponges
Cárdenas, Paco A.; Rapp, Hans Tore (Peer reviewed; Journal article, 2015-08-06)In July–August 2004, the Mid-Atlantic Ridge Ecosystems (MAR-Eco) expedition collected Demospongiae (Porifera) from the Northern Mid-Atlantic Ridge (MAR) north of the Azores, between 41°N and 61°N. Demosponges were found ... -
Do ampharetids take sedimented steps between vents and seeps? Phylogeny and habitat-use of Ampharetidae (Annelida, Terebelliformia) in chemosynthesis-based ecosystems
Eilertsen, Mari Heggernes; Kongsrud, Jon Anders; Alvestad, Tom; Stiller, Josefin; Rouse, Greg W; Rapp, Hans Tore (Peer reviewed; Journal article, 2017-10-31)Background: A range of higher animal taxa are shared across various chemosynthesis-based ecosystems (CBEs), which demonstrates the evolutionary link between these habitats, but on a global scale the number of species ... -
Drivers of Megabenthic Community Structure in One of the World’s Deepest Silled-Fjords, Sognefjord (Western Norway)
Meyer, Heidi Kristina; Roberts, Emyr Martyn; Mienis, Furu; Rapp, Hans Tore (Journal article; Peer reviewed, 2020-06-09)The Sognefjord is the longest (205 km) and deepest (1308 m) fjord in Norway, and the second-longest in the world. Coast-fjord exchange in Sognefjord is limited by a seaward sill at 170 m water depth, which causes a clear ... -
Exitomelita sigynae gen. et sp. nov.: a new amphipod from the Arctic Loki Castle vent field with potential gill ectosymbionts
Tandberg, Anne Helene; Rapp, Hans Tore; Schander, Christoffer; Vader, Wim; Sweetman, Andrew K.; Berge, Jørgen (Peer reviewed; Journal article, 2011-11-02)The newly discovered deep-sea hydrothermal vent field ‘‘Loki’s Castle’’ at 2,350 m depth at 70 N on the Knipovich Ridge north of the island Jan Mayen is the only known black smoker field from the Arctic Ridge system. This ... -
Faunal trophic structure at hydrothermal vents on the southern Mohn's Ridge, Arctic Ocean
Sweetman, Andrew Kvassnes; Levin, Lisa; Rapp, Hans Tore; Schander, Christoffer (Peer reviewed; Journal article, 2013)We explore the trophic ecology of heterotrophic fauna associated with a high temperature (HT) vent, 2 low temperature vents, a ‘near-HT vent’ habitat and a non-vent site situated at upper bathyal depths on the southern ... -
The First Cut Is the Deepest: Trawl Effects on a Deep-Sea Sponge Ground Are Pronounced Four Years on
Morrison, Katelin M.; Meyer, Heidi Kristina; Roberts, Emyr Martyn; Rapp, Hans Tore; Colaço, Ana; Pham, Christopher K. (Journal article; Peer reviewed, 2020)Few studies have described the effects of physical disturbance and post-recovery of deep-sea benthic communities. Here, we explore the status of deep-sea sponge ground communities four years after being impacted by an ... -
Genetic connectivity from the Arctic to the Antarctic: Sclerolinum contortum and Nicomache lokii (Annelida) are both widespread in reducing environments
Eilertsen, Mari Heggernes; Georgieva, Magdalena N.; Kongsrud, Jon Anders; Linse, Katrin; Wiklund, Helena; Glover, Adrian G.; Rapp, Hans Tore (Peer reviewed; Journal article, 2018-03-19)The paradigm of large geographic ranges in the deep sea has been challenged by genetic studies, which often reveal putatively widespread species to be several taxa with more restricted ranges. Recently, a phylogeographic ... -
Genome-wide analysis of the sox family in the calcareous sponge Sycon ciliatum: multiple genes with unique expression patterns
Fortunato, Sofia; Adamski, Marcin; Bergum, Brith; Guder, Corina; Jordal, Signe; Rapp, Hans Tore; Leininger, Sven; Zwafink, Christin; Adamska, Maja (Peer reviewed; Journal article, 2012-06-23)Background: Sox genes are HMG-domain containing transcription factors with important roles in developmental processes in animals; many of them appear to have conserved functions among eumetazoans. Demosponges have fewer ... -
Glass sponge grounds on the Scotian Shelf and their associated biodiversity
Hawkes, Nickolas James; Korabik, Michelle; Beazley, Lindsay; Rapp, Hans Tore; Xavier, Joana R.; Kenchington, Ellen (Peer reviewed; Journal article, 2019)Emerald Basin on the Scotian Shelf off Nova Scotia, Canada, is home to a globally unique population of the glass sponge Vazella pourtalesi. Through the analysis of both in situ photographs and trawl catch data from annual ... -
The influence of vent systems on pelagic eukaryotic micro-organism composition in the Nordic Seas
Olsen, Bernt Rydland; Troedsson, Christofer; Hadziavdic, Kenan; Pedersen, Rolf B.; Rapp, Hans Tore (Peer reviewed; Journal article, 2015-04) -
Macro and Microstructural Characteristics of North Atlantic Deep-Sea Sponges as Bioinspired Models for Tissue Engineering Scaffolding
Martins, Eva; Rapp, Hans Tore; Xavier, Joana R.; Diogo, Gabriela S.; Reis, Rui L.; Silva, Tiago H. (Journal article; Peer reviewed, 2021)Sponges occur ubiquitously in the marine realm and in some deep-sea areas they dominate the benthic communities forming complex biogenic habitats – sponge grounds, aggregations, gardens and reefs. However, deep-sea sponges ... -
Mapping benthic ecological diversity and interactions with bottom-contact fishing on the Flemish Cap (northwest Atlantic)
Murillo, Francisco Javier; Kenchington, Ellen; Koen-Alonso, Mariano; Guijarro, J.; Kenchington, T.J.; Sacau, M.; Beazley, Lindsay; Rapp, Hans Tore (Journal article; Peer reviewed, 2020)The ecological diversity of benthic invertebrates from bottom trawl surveys was mapped for the Flemish Cap, a plateau of ~200 km radius in the northwest Atlantic. Species density (SpD), the exponential Shannon diversity ... -
The Microbiome and Occurrence of Methanotrophy in Carnivorous Sponges
Hestetun, Jon Thomassen; Dahle, Håkon; Jørgensen, Steffen Leth; Olsen, Bernt Rydland; Rapp, Hans Tore (Peer reviewed; Journal article, 2016-11-09)As shown by recent studies, filter-feeding sponges are known to host a wide variety of microorganisms. However, the microbial community of the non-filtering carnivorous sponges (Porifera, Cladorhizidae) has been the subject ... -
The Molecular Machinery of Gametogenesis in Geodia Demosponges (Porifera): Evolutionary Origins of a Conserved Toolkit across Animals
Koutsouveli, Vasiliki; Cárdenas, Paco; Santodomingo, Nadiezhda; Marina, Anabel; Morato, Esperanza; Rapp, Hans Tore; Riesgo, Ana (Journal article; Peer reviewed, 2020)All animals are capable of undergoing gametogenesis. The ability of forming haploid cells from diploid cells through meiosis and recombination appeared early in eukaryotes, whereas further gamete differentiation is mostly ... -
Molecular phylogenies challenge the classification of Polymastiidae (Porifera, Demospongiae) based on morphology
Plotkin, Alexander; Voigt, Oliver; Willassen, Endre; Rapp, Hans Tore (Peer reviewed; Journal article, 2016)Polymastiidae Gray, 1867 is a worldwide distributed sponge family, which has a great significance for understanding of the demosponge deep phylogeny since the former order Hadromerida Topsent, 1894 has been recently split ... -
Molecular Phylogeny of the Astrophorida (Porifera, Demospongiaep) Reveals an Unexpected High Level of Spicule Homoplasy
Cárdenas, Paco; Xavier, Joana R.; Reveillaud, Julie; Schander, Christoffer; Rapp, Hans Tore (Peer reviewed; Journal article, 2011-04-08)Background: The Astrophorida (Porifera, Demospongiaep) is geographically and bathymetrically widely distributed. Systema Porifera currently includes five families in this order: Ancorinidae, Calthropellidae, Geodiidae, ... -
New species of Ampharetidae (Annelida: Polychaeta) from the Arctic Loki Castle vent field
Kongsrud, Jon Anders; Eilertsen, Mari Heggernes; Alvestad, Tom; Kongshavn, Katrine; Rapp, Hans Tore (Peer reviewed; Journal article, 2016-03)Ampharetid polychaetes adapted to live in chemosynthetic environments are well known from the deep Pacific and Atlantic Oceans, but to date no such species have been reported from the Arctic Ocean. Here, we describe two ...