GLORIA

GEOMAR Library Ocean Research Information Access

X

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • Cambridge University Press (CUP)  (8)
  • 1
    Online-Ressource
    Online-Ressource
    A primer to metabarcoding surveys of Antarctic terrestrial biodiversity
    Cambridge University Press (CUP) ; 2017
    In:  Antarctic Science Vol. 29, No. 1 ( 2017-02), p. 3-15
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 29, No. 1 ( 2017-02), p. 3-15
    Kurzfassung: Ice-free regions of Antarctica are concentrated along the coastal margins but are scarce throughout the continental interior. Environmental changes, including the introduction of non-indigenous species, increasingly threaten these unique habitats. At the same time, the unique biotic communities subsisting in isolation across the continent are difficult to survey due to logistical constraints, sampling challenges and problems related to the identification of small and cryptic taxa. Baseline biodiversity data from remote Antarctic habitats are still missing for many parts of the continent but are critical to the detection of community changes over time, including newly introduced species. Here we review the potential of standardized (non-specialist) sampling in the field (e.g. from soil, vegetation or water) combined with high-throughput sequencing (HTS) of bulk DNA as a possible solution to overcome some of these problems. In particular, HTS metabarcoding approaches benefit from being able to process many samples in parallel, while workflow and data structure can stay highly uniform. Such approaches have quickly gained recognition and we show that HTS metabarcoding surveys are likely to play an important role in continent-wide biomonitoring of all Antarctic terrestrial habitats.
    Materialart: Online-Ressource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S0954102016000389
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2017
    ZDB Id: 2104104-0
    ZDB Id: 1009128-2
    SSG: 12
    SSG: 13
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 2
    Online-Ressource
    Online-Ressource
    Diacyclops (Copepoda: Cyclopoida) in Continental Antarctica, including three new species
    Cambridge University Press (CUP) ; 2014
    In:  Antarctic Science Vol. 26, No. 3 ( 2014-06), p. 250-260
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 26, No. 3 ( 2014-06), p. 250-260
    Kurzfassung: Contrary to earlier beliefs, crustaceans are present in ice-covered lakes of Antarctica. Interpretation of the significance of this has been hampered by the absence of robust identification of taxa present. We examine cyclopoid copepods from three widely separated lakes. All belong to the michaelseni group of the genus Diacyclops , which is widespread across Continental Antarctica, but do not fit into any existing species. Two new species were identified from eastern Antarctica, D. walkeri from Pineapple Lake (Vestfold Hills) and D. kaupi from Transkriptsii Gulf (Bunger Hills). Most significant was a dense population of a new epibenthic species ( D. joycei ) associated with microbial mats in Lake Joyce, one of the smaller McMurdo Dry Valleys lakes. This represents the first record of adult cyclopoid copepods from the ice-covered lakes of the Transantarctic Mountains. Continental Antarctica is the centre of diversity for this group of crustaceans and we argue that this is better explained by persistence through past glacial advances rather than by recent post-glacial colonization. The existence of a species endemic to Lake Joyce but apparently absent from other Dry Valleys lakes is discussed in relation to our understanding of the history of the McMurdo Dry Valleys lakes and their faunas.
    Materialart: Online-Ressource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S0954102013000643
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2014
    ZDB Id: 2104104-0
    ZDB Id: 1009128-2
    SSG: 12
    SSG: 13
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 3
    Online-Ressource
    Online-Ressource
    100 years on: a re-evaluation of the first discovery of microfauna from Ross Island, Antarctica
    Cambridge University Press (CUP) ; 2018
    In:  Antarctic Science Vol. 30, No. 4 ( 2018-08), p. 209-219
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 30, No. 4 ( 2018-08), p. 209-219
    Kurzfassung: Over a century ago microfaunal diversity was first recorded by James Murray in lakes at Cape Royds, Ross Island, Antarctica. The report stands as the seminal study for today’s biodiversity investigations, and as a baseline to evaluate changes in faunal communities and introductions. In the present study, Cape Royds lakes were revisited and the mitochondrial c oxidase subunit I (COI) gene and morphology were used to compare diversity of Rotifera, Tardigrada and Nematoda with the records Murray published in the early 1900s. Cyanobacterial mats and the water column were sampled for microfauna from the five largest lakes using methods described by Murray. Across all five lakes similar patterns were observed for species distribution of all three phyla reported by Murray over 100 years ago. Some changes in species assemblages were identified within and between lakes, but there were no new introductions of named species for the Cape Royds region. Some of the species included by Murray in his monograph have been recently redescribed as Antarctic endemics, but others still retain their original name from the Northern Hemisphere holotypes and are also in need of revision to adequately determine the true endemism for these faunal groups.
    Materialart: Online-Ressource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S095410201800007X
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2018
    ZDB Id: 2104104-0
    ZDB Id: 1009128-2
    SSG: 12
    SSG: 13
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 4
    Online-Ressource
    Online-Ressource
    Molecular support for Pleistocene persistence of the continental Antarctic moss Bryum argenteum
    Cambridge University Press (CUP) ; 2010
    In:  Antarctic Science Vol. 22, No. 6 ( 2010-12), p. 721-726
    Details
    In: Antarctic Science, Cambridge University Press (CUP), Vol. 22, No. 6 ( 2010-12), p. 721-726
    Kurzfassung: We examined sequence variation of ITS and phy 2 for Bryum argenteum from Antarctica, sub-Antarctic, New Zealand and Australia to understand better taxonomic delimitations and resolve relationships between these geographic regions. Bryum argenteum has been recorded as two species, B. argenteum and B. subrotundifolium , in all four regions with the latter now referred to as B. argenteum var. muticum . We found disagreement between taxon delimitations (based on morphology) and molecular markers. All continental Antarctic specimens consistently formed a monophyletic sister group that consisted of both morphologically identified B. argenteum varieties, separate to all non-Antarctic specimens (also consisting of both varieties). We suggest, contrary to previous records, that all continental Antarctic (Victoria Land) populations are referable to B. argenteum var. muticum , while sub-Antarctic, Australian and New Zealand populations included here are B. argenteum var. argenteum . Additionally, since there was less genetic diversity within Victoria Land, Antarctica, than observed between non-Antarctic samples, we suggest that this is, in part, due to a potentially lower rate of DNA substitution and isolation in northern and southern refugia within Victoria Land since the Pleistocene.
    Materialart: Online-Ressource
    ISSN: 0954-1020 , 1365-2079
    URL: Article
    DOI: 10.1017/S0954102010000453
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2010
    ZDB Id: 2104104-0
    ZDB Id: 1009128-2
    SSG: 12
    SSG: 13
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 5
    Online-Ressource
    Online-Ressource
    Pollen larceny of the tropical weed Solanum torvum by a Fijian endemic halictine bee with implications for the spread of plants with specialized pollinator requirements
    Cambridge University Press (CUP) ; 2017
    In:  Journal of Tropical Ecology Vol. 33, No. 3 ( 2017-05), p. 183-187
    Details
    In: Journal of Tropical Ecology, Cambridge University Press (CUP), Vol. 33, No. 3 ( 2017-05), p. 183-187
    Kurzfassung: The ability of plants to colonize new habitats is influenced by their dependence on effective pollinators. This can be very important for plants that require specialized pollinators, especially when they disperse to islands that have low pollinator diversity. One form of specialization involves plants that require buzz-pollination, where bees must vibrate poricidal anthers at frequencies that allow pollen to be released. Pollen larceny is a phenomenon where insects ‘steal’ pollen from flowers which usually results in reduced pollination, but in some cases there can be a small contribution to pollination. Here we report pollen larceny in an endemic Fijian halictine bee Homalictus fijiensis that steals pollen by chewing anthers of the invasive weed Solanum torvum , which is a pollen-only plant requiring buzz pollination. In over nine hours of observations at six sites where H. fijiensis visited S. torvum , it never attempted to locate nectaries, it never buzzed anthers, and instead chewed anther tips, indicating an adaptation to exploit nectarless flowers with poricidal anthers without buzz-pollination. Analyses of 30 pollen loads from H. fijiensis collected from S. torvum flowers indicate 27 of these contained S. torvum pollen, ranging from 1% to 99% of total pollen, indicating it is a pollen vector for this plant. Our findings support arguments that super-generalist pollinators in island ecosystems can promote the spread of invasive plants, but go further by indicating that super-generalist strategies can extend to plants with highly specialized pollinator requirements.
    Materialart: Online-Ressource
    ISSN: 0266-4674 , 1469-7831
    URL: Article
    DOI: 10.1017/S0266467417000098
    RVK:
    WA 15000
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2017
    ZDB Id: 1466679-0
    SSG: 12
    SSG: 23
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 6
    Online-Ressource
    Online-Ressource
    The status of two exotic terrestrial Crustacea on sub-Antarctic Macquarie Island
    Cambridge University Press (CUP) ; 2008
    In:  Polar Record Vol. 44, No. 1 ( 2008-01), p. 15-23
    Details
    In: Polar Record, Cambridge University Press (CUP), Vol. 44, No. 1 ( 2008-01), p. 15-23
    Kurzfassung: Two terrestrial Crustacea, Puhuruhuru patersoni (Amphipoda: Talitridae) and Styloniscus otakensis (Isopoda: Styloniscidae), were discovered on sub-Antarctic Macquarie Island in 1991 and 1992, respectively. Each species was identified as having been described, and previously only known, from South Island, New Zealand and from some of New Zealand's southern offshore islands. The distributions of the two species on Macquarie Island have been mapped in detail on four occasions over the last fifteen years, each mapping extending previously existing distributions or showing changes from the earlier records. Details of all four years' mapping are figured. It is concluded that these species were most likely introduced between 1810 and 1919 and that populations of the amphipod have not expanded to any extent in the twelve years between 1992 and 2004 but that the isopod has slightly increased its range. Both species are macrodetritivores, a trophic group not well represented on the island, so there is the possibility of an irreversible change to the Macquarie Island ecosystem if they become more widespread with warming climates. However no such change has yet been observed. The advantages and feasibility of removing these two exotic species from the island is discussed, as are the possible routes by which the species were introduced to the island.
    Materialart: Online-Ressource
    ISSN: 0032-2474 , 1475-3057
    URL: Article
    DOI: 10.1017/S0032247407006778
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2008
    ZDB Id: 3926-3
    ZDB Id: 2100301-4
    SSG: 14
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 7
    Online-Ressource
    Online-Ressource
    Associations of alcohol and cannabis use with change in posttraumatic stress disorder and depression symptoms over time in recently trauma-exposed individuals
    Cambridge University Press (CUP) ; 2023
    In:  Psychological Medicine
    Details
    In: Psychological Medicine, Cambridge University Press (CUP)
    Kurzfassung: Several hypotheses may explain the association between substance use, posttraumatic stress disorder (PTSD), and depression. However, few studies have utilized a large multisite dataset to understand this complex relationship. Our study assessed the relationship between alcohol and cannabis use trajectories and PTSD and depression symptoms across 3 months in recently trauma-exposed civilians. Methods In total, 1618 (1037 female) participants provided self-report data on past 30-day alcohol and cannabis use and PTSD and depression symptoms during their emergency department (baseline) visit. We reassessed participant's substance use and clinical symptoms 2, 8, and 12 weeks posttrauma. Latent class mixture modeling determined alcohol and cannabis use trajectories in the sample. Changes in PTSD and depression symptoms were assessed across alcohol and cannabis use trajectories via a mixed-model repeated-measures analysis of variance. Results Three trajectory classes (low, high, increasing use) provided the best model fit for alcohol and cannabis use. The low alcohol use class exhibited lower PTSD symptoms at baseline than the high use class; the low cannabis use class exhibited lower PTSD and depression symptoms at baseline than the high and increasing use classes; these symptoms greatly increased at week 8 and declined at week 12. Participants who already use alcohol and cannabis exhibited greater PTSD and depression symptoms at baseline that increased at week 8 with a decrease in symptoms at week 12. Conclusions Our findings suggest that alcohol and cannabis use trajectories are associated with the intensity of posttrauma psychopathology. These findings could potentially inform the timing of therapeutic strategies.
    Materialart: Online-Ressource
    ISSN: 0033-2917 , 1469-8978
    URL: Article
    DOI: 10.1017/S0033291723001642
    RVK:
    XA 10000
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2023
    ZDB Id: 1470300-2
    SSG: 5,2
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
  • 8
    Online-Ressource
    Online-Ressource
    Socio-demographic and trauma-related predictors of depression within eight weeks of motor vehicle collision in the AURORA study
    Cambridge University Press (CUP) ; 2022
    In:  Psychological Medicine Vol. 52, No. 10 ( 2022-07), p. 1934-1947
    Details
    In: Psychological Medicine, Cambridge University Press (CUP), Vol. 52, No. 10 ( 2022-07), p. 1934-1947
    Kurzfassung: This is the first report on the association between trauma exposure and depression from the A dvancing U nderstanding of R ec O very afte R traum A (AURORA) multisite longitudinal study of adverse post-traumatic neuropsychiatric sequelae (APNS) among participants seeking emergency department (ED) treatment in the aftermath of a traumatic life experience. Methods We focus on participants presenting at EDs after a motor vehicle collision (MVC), which characterizes most AURORA participants, and examine associations of participant socio-demographics and MVC characteristics with 8-week depression as mediated through peritraumatic symptoms and 2-week depression. Results Eight-week depression prevalence was relatively high (27.8%) and associated with several MVC characteristics (being passenger v. driver; injuries to other people). Peritraumatic distress was associated with 2-week but not 8-week depression. Most of these associations held when controlling for peritraumatic symptoms and, to a lesser degree, depressive symptoms at 2-weeks post-trauma. Conclusions These observations, coupled with substantial variation in the relative strength of the mediating pathways across predictors, raises the possibility of diverse and potentially complex underlying biological and psychological processes that remain to be elucidated in more in-depth analyses of the rich and evolving AURORA database to find new targets for intervention and new tools for risk-based stratification following trauma exposure.
    Materialart: Online-Ressource
    ISSN: 0033-2917 , 1469-8978
    URL: Article
    DOI: 10.1017/S0033291720003773
    RVK:
    XA 10000
    Sprache: Englisch
    Verlag: Cambridge University Press (CUP)
    Publikationsdatum: 2022
    ZDB Id: 1470300-2
    SSG: 5,2
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Online-Ressource
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...