Artikler, rapporter og annet (arktisk og marin biologi): Nye registreringer
Viser treff 281-300 av 1535
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Contrasting Life Traits of Sympatric Calanus glacialis and C. finmarchicus in a Warming Arctic Revealed by a Year-Round Study in Isfjorden, Svalbard
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-12)The calanoid copepod Calanus glacialis dominates the mesozooplankton biomass in the Arctic shelf seas, but its smaller North Atlantic sibling Calanus finmarchicus is expanding northwards and may potentially replace it if the climate continues to warm. Here we studied the population structure, overwintering strategies, gonad maturation and egg production of C. glacialis and C. finmarchicus over ... -
Seasonal mesozooplankton patterns and timing of life history events in high-arctic fjord environments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-11)Seasonal patterns in mesozooplankton composition, vertical distribution, and timing of reproduction are challenging to study in the open sea due to ocean currents and mix of populations of different origins. Sill fjords, on the other hand, with restricted water exchange, are ideal locations for studying taxa- and community-specific adaptations to the prevailing environment. Here, we present ... -
Impact of a Dinophysis acuminata Bloom on the Copepod Acartia clausi: First Indications
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-12)Faecal pellet production and content along with egg production of the dominant copepod species Acartia clausi were studied in the Thermaikos Gulf (NW Aegean Sea) during a prebloom and a bloom of the toxic dinoflagellate Dinophysis acuminata. Both faecal pellet production (6.8–8.6 ind<sup>−1</sup> d <sup>−1</sup> ) and egg production (15.8–47.6 ind<sup>−1</sup> d <sup>−1</sup> ) appeared unrelated ... -
New records of land-snail species from caves of Mato Grosso state, Midwest Brazil (Gastropoda, Neritimorpha and Stylommatophora)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-14)Recent collection efforts in caves of Mato Grosso state, Brazilian Midwest, have brought to light specimens of four Neritimorpha and Stylommatophora land-snail species previously unrecorded from that state: Helicina fulva d’Orbigny, 1835 (Family Helicinidae), Streptartemon abunaensis (F. Baker, 1914) and Streptartemon decipiens (Crosse, 1865) (family Streptaxidae), and Systrophia alcidiana Ancey, ... -
Genomic Consequences of Fragmentation in the Endangered Fennoscandian Arctic Fox (Vulpes lagopus)
(Journal article; Tidsskriftartikkel, 2022-11-15)Accelerating climate change is causing severe habitat fragmentation in the Arctic, threatening the persistence of many cold-adapted species. The Scandinavian arctic fox (V. lagopus) is highly fragmented, with a once continuous, circumpolar distribution, it struggled to recover from a demographic bottleneck in the late 19th century. The future persistence of the entire Scandinavian population is ... -
Temporal stability of polymorphic Arctic charr parasite communities reflects sustained divergent trophic niches
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-05)Polymorphic Arctic charr Salvelinus alpinus populations frequently display distinct differences in habitat use, diet, and parasite communities. Changes to the relative species densities and composition of the wider fish community have the potential to alter the habitat niche of sympatric Arctic charr populations. This study evaluated the temporal stability of the parasite community, diet, and stable ... -
Cave-dwelling gastropods (Mollusca: Gastropoda) of Brazil: state of the art and conservation
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-26)An up-to-date list of exclusively cave-dwelling gastropod species recorded in Brazil is presented including updated taxonomy, detailed geographic information, and illustration of types. The list includes 18 cave-exclusive (troglobitic) gastropods encompassing 15 land and three freshwater species, with the status of further species pending additional studies. Their unusual morphology and diversity ... -
Fossil molluscs from the Middle Miocene of Öhningen, southwestern Germany
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-17)Herein, we revise an extensive set of mollusc fossils from the Upper Freshwater Molasse deposits of Öhningen palaeolake (SW Germany; Middle Miocene, MN7). Based on material housed in paleontological collections in Europe and North America, we present the first thorough systematic account of the phylum from this historic locality. A total of ten species were identified from Öhningen: three freshwater ... -
Distribution of biodiversity of wild beet species (Genus Beta L.) in Armenia under ongoing climate change conditions
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-24)The reported annual temperature increase and significant precipitation drop in Armenia impact the country’s ecosystems and biodiversity. The present study surveyed the geographical distribution of the local wild beet species under the ongoing climate change conditions. We showed that B. lomatogona, B. corolliflora and B. macrorhiza are sensitive to climate change and were affected to various degrees, ... -
The Rapid Expansion of the Jumping Snail Ovachlamys fulgens in Brazil
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-29)The exotic Japanese jumping snail, Ovachlamys fulgens, was first recorded in Santa Catarina state, Brazil, in 2013. Based on data gathered from the literature, natural history collections, field samplings, and the iNaturalist platform, we assess its current distribution in the country. Our data show that the jumping snail has had a dramatic range expansion since its introduction, reaching six ... -
The impact of climate sensitive factors on the exposure to organohalogenated contaminants in an aquatic bird exploiting both marine and freshwater habitats
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-07-27)To assess how climate-sensitive factors may affect the exposure to organochlorines (OCs) and perfluoroalkyl substances (PFASs), we monitored concentrations in eggs of the common goldeneye (<i>Bucephala clangula</i>) over two decades (1999–2019) in central Norway. The goldeneye alternates between marine and freshwater habitats and is sensitive to climate variation, especially due to alterations in ... -
Svalbard reindeer winter diets: Long-term dietary shifts to graminoids in response to a changing climate
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-07)Arctic ecosystems are changing dramatically with warmer and wetter conditions resulting in complex interactions between herbivores and their forage. We investigated how Svalbard reindeer (Rangifer tarandus platyrhynchus) modify their late winter diets in response to long-term trends and interannual variation in forage availability and accessibility. By reconstructing their diets and foraging ... -
Why are Svalbard Arctic foxes Brucella spp. seronegative?
(Journal article; Tidsskriftartikkel, 2022-07-06)Arctic foxes (Vulpes lagopus) are susceptible to smooth Brucella (s-Brucella) infection and may be exposed to such bacteria through the consumption of infected marine mammals, as implied by the finding of s-Brucella antibodies in polar bears (Ursus maritimus). Arctic foxes in Svalbard have not previously been investigated for s-Brucella antibodies, but such antibodies have been detected in Arctic ... -
Phylogenetic position of the relict South American genus Idiopyrgus Pilsbry, 1911 (Gastropoda, Truncatelloidea), with the description of two new cave species
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-14)Idiopyrgus is a relict genus of freshwater snails from Brazil traditionally classified in the family Pomatiopsidae. Herein, we use molecular data from newly acquired specimens to test that classification through Bayesian inference phylogenetic analysis. We conclude that Idiopyrgus belongs in the Gondwanan family Tomichiidae, together with the African genus Tomichia and the Australian genus Coxiella. ... -
iNaturalist as a tool in the study of tropical molluscs
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-05)Although terrestrial gastropods are remarkably diverse, our knowledge of them is still lacking, especially for species from the Global South. As such, new tools to help researchers collect data on these organisms are very welcome. With this in mind, we investigated Brazilian observations on iNaturalist to assess the feasibility of the data available on the platform as a basis for studies on the ... -
Phylogenetic position of African punctoid snails (Stylommatophora, Punctoidea, Trachycystinae)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-02)The punctoid land snail family Charopidae, as currently defined, is a paraphyletic assemblage of taxa with Gondwanan distribution. It is represented in Africa largely by the pinwheels (genus Trachycystis and allies) and afrodontas (genus Afrodonta and allies), as well as a few additional genera, such as Reticulapex, Pilula, and Helenoconcha. Herein, a Bayesian inference phylogenetic analysis (using ... -
The Coordinated Action of MYB Activators and Repressors Controls Proanthocyanidin and Anthocyanin Biosynthesis in Vaccinium
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-24)Vaccinium berries are regarded as “superfoods” owing to their high concentrations of anthocyanins, flavonoid metabolites that provide pigmentation and positively affect human health. Anthocyanin localization differs between the fruit of cultivated highbush blueberry (V. corymbosum) and wild bilberry (V. myrtillus), with the latter having deep red flesh coloration. Analysis of comparative ... -
Publication practice in Taxonomy: Global inequalities and potential bias against negative results
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-01)There is broad recognition by practicing taxonomists that the field is going through a crisis, which has been dubbed the “taxonomic impediment”. There are many aspects involved in said crisis, but publication practices in taxonomy are often neglected or relegated to the backseat. We provide an initial foray into this topic via a worldwide survey with taxonomists, spanning all botanical and ... -
Stress responses to repeated captures in a wild ungulate
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-29)While capture-mark-recapture studies provide essential individual-level data in ecology, repeated captures and handling may impact animal welfare and cause scientific bias. Evaluating the consequences of invasive methodologies should be an integral part of any study involving capture of live animals. We investigated short- and long-term stress responses to repeated captures within a winter on the ... -
The root zone of graminoids: A niche for H2-consuming acetogens in a minerotrophic peatland
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-08-05)The importance of acetogens for H<sub>2</sub> turnover and overall anaerobic degradation in peatlands remains elusive. In the well-studied minerotrophic peatland fen Schlöppnerbrunnen, H<sub>2</sub>-consuming acetogens are conceptualized to be largely outcompeted by iron reducers, sulfate reducers, and hydrogenotrophic methanogens in bulk peat soil. However, in root zones of graminoids, fermenters ...