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  • 1
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    Successful ecosystem-based management of Antarctic krill should address uncertainties in krill recruitment, behaviour and ecological adaptation (2020)
    Nature Publishing Group
    In:  EPIC3Communications Earth & Environment, Nature Publishing Group, 1(28), ISSN: 2662-4435
    Details
    Publikationsdatum: 2020-11-12
    Beschreibung: Antarctic krill, Euphausia superba, supports a valuable commercial fishery in the Southwest Atlantic, which holds the highest krill densities and is warming rapidly. The krill catch is increasing, is concentrated in a small area, and has shifted seasonally from summer to autumn/winter. The fishery is managed by the Commission for the Conservation of Antarctic Marine Living Resources, with the main goal of safeguarding the large populations of krill-dependent predators. Here we show that, because of the restricted distribution of successfully spawning krill and high inter-annual variability in their biomass, the risk of direct fishery impacts on the krill stock itself might be higher than previously thought. We show how management benefits could be achieved by incorporating uncertainty surrounding key aspects of krill ecology into management decisions, and how knowledge can be improved in these key areas. This improved information may be supplied, in part, by the fishery itself.
    Repository-Name: EPIC Alfred Wegener Institut
    Materialart: Article , isiRev
    Format: application/pdf
    Standort Signatur Einschränkungen Verfügbarkeit
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    ARTIKEL (OA)
  • 2
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    Distribution of larval and juvenile pelagic squids in the Kerguelen Axis region: Oceanographic influence on size structure and evidence of spawning locations (2020)
    Elsevier
    Details
    Publikationsdatum: 2023-02-08
    Beschreibung: Pelagic squids are a key component in Southern Ocean ecosystems. Most species have a circumpolar distribution that is patchy in relation to major oceanographic features. However, little is known regarding where and when they spawn, or subsequently, what environmental predictors drive the size distribution particularly during early life stages. Here, we relate the size distribution of larval and juvenile squids to the oceanographic conditions around the southern Kerguelen Plateau. This is an important foraging area for many predators of squid, but there has been very little sampling effort for squids to date in that area. Seven squid species from six families were captured using depth-stratified mid-water trawls. The squids had a mantle length (ML) ranging from 7.3 to 680.1 mm, and were at their larval and juvenile form with the exception of two larger mature Galiteuthis glacialis (431.4 mm and 680.1 mm ML). Squids at stages 0 to I were predominant (ML 〈 100 mm), with a single size mode for each species, suggesting that these species may use the plateau as a spawning and/or nursery ground. Larger individuals (〉100 mm ML, above maturity stage I) were generally observed more in the southeast of the study domain. Squid size was positively associated with lower minimal water column temperature, higher surface chlorophyll-a concentration, and both the deepest and shallowest layers of the water column. The spatial distribution may be adaptive, helping to reduce inter- and intra-species competition and increase survivorship during early life stages. The reported relationships provide important new insights into the biophysical drivers of pelagic squid habitats around the Southern Ocean. These data significantly increase the known range of several Southern Ocean species and present implications for spawning habitat that warrant further investigation.
    Materialart: Article , PeerReviewed
    Format: text
    Standort Signatur Einschränkungen Verfügbarkeit
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    OceanRep: Artikel in einer Fachzeitschrift - begutachtet
  • 3
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    Two isocitrate dehydrogenases from a plant pathogen Xanthomonas campestris pv. campestris 8004. Bioinformatic analysis, enzymatic characterization, and implication in virulence (2016)
    Wiley-Blackwell
    Details
    Publikationsdatum: 2016-06-11
    Beschreibung: Isocitrate dehydrogenase (IDH) is a key enzyme in the tricarboxylate (TCA) cycle, which may play an important role in the virulence of pathogenic bacteria. Here, two structurally different IDHs from a plant pathogen Xanthomonas campestris pv. campestris 8004 (XccIDH1 and XccIDH2) were characterized in detail. The recombinant XccIDH1 forms homodimer in solution, while the recombinant XccIDH2 is a typical monomer. Phylogenetic analysis showed that XccIDH1 belongs to the type I IDH subfamily and XccIDH2 groups into the monomeric IDH clade. Kinetic characterization demonstrated that XccIDH1's specificity towards NAD + was 110-fold greater than NADP + , while XccIDH2's specificity towards NADP + was 353-fold greater than NAD + . The putative coenzyme discriminating amino acids (Asp268, Ile269 and Ala275 for XccIDH1, and Lys589, His590 and Arg601 for XccIDH2) were studied by site-directed mutagenesis. The coenzyme specificities of the two mutants, mXccIDH1 and mXccIDH2, were completely reversed from NAD + to NADP + , and NADP + to NAD + , respectively. Furthermore, Ser80 of XccIDH1, and Lys256 and Tyr421 of XccIDH2, were the determinants for the substrate binding. The detailed biochemical properties, such as optimal pH and temperature, thermostability, and metal ion effects, of XccIDH1 and XccIDH2 were further investigated. The possibility of taking the two IDHs into consideration as the targets for drug development to control the plant diseases caused by Xcc 8004 were described and discussed thoroughly.
    Print ISSN: 0233-111X
    Digitale ISSN: 1521-4028
    Thema: Biologie
    Publiziert von Wiley-Blackwell
    Standort Signatur Einschränkungen Verfügbarkeit
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    PAPER CURRENT
  • 4
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    MicroRNA-206 is involved in hypoxia-induced pulmonary hypertension through targeting of the HIF-1α/Fhl-1 pathway (2013)
    Nature Publishing Group (NPG)
    Details
    Publikationsdatum: 2013-06-28
    Beschreibung: MicroRNA-206 is involved in hypoxia-induced pulmonary hypertension through targeting of the HIF-1α/Fhl-1 pathway Laboratory Investigation 93, 748 (July 2013). doi:10.1038/labinvest.2013.63 Authors: Junqiu Yue, Jing Guan, Xiaoyan Wang, Lili Zhang, Zixuan Yang, Qilin Ao, Yunte Deng, Pengcheng Zhu & Guoping Wang
    Schlagwort(e): Fhl-1HIF-1αhypoxiamicroRNA-206pulmonary hypertension
    Print ISSN: 0023-6837
    Digitale ISSN: 1530-0307
    Thema: Medizin
    Publiziert von Nature Publishing Group (NPG)
    Standort Signatur Einschränkungen Verfügbarkeit
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    PAPER CURRENT
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