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f format motivation letter research plan curriculum vitae diplomas master and phd degree or equivalent complete publication list separate reprints of 3 particularly relevant papers we reserve the right not to consider material received after the deadline and not to consider applications that do not live up to the abovementioned requirements the further process after the expiry of the deadline for applications the authorized recruitment manager selects applicants for assessment on the advice of the hiring committee all applicants are then immediately notified whether their application has been passed for assessment by an unbiased assessor once the assessment work has been completed each applicant has the opportunity to comment on the part of the assessment that relates to the applicant him herself you can read about the recruitment process at https employment ku dk faculty recruitment process interviews are expected to be held in week 33 contact per juel hansen e mail gwz910 ku dk contact sam dupont e mail sam dupont bioenv gu se continue reading postdoc position effects of acidification on marine phytoplankton and zooplankton share this post share on facebook opens in new window facebook email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit share on linkedin opens in new window linkedin share on tumblr opens in new window tumblr share on pinterest opens in new window pinterest like this like loading short term plasticity and long term transcriptomic rewiring under natural ocean acidification in an ecosystem relevant sea urchin published 1 july 2026 science leave a comment highlights natural co 2 vents reveal transcriptomic responses to chronic ocean acidification acute low ph exposure triggers rapid but limited plastic responses in arbacia lixula vent origin arbacia lixula exhibit extensive metabolic reprogramming and antioxidant activation low ph supresses biomineralization genes and up regulates collagen and extracellular matrix pathways persistence under ocean acidification is associated with energetic trade offs and skeletal homeostasis abstract ocean acidification is reshaping coastal ecosystems as a consequence of anthropogenic co 2 emissions natural co 2 vent systems provide valuable analogues for investigating organismal responses to long term acidified conditions under ecologically realistic scenarios here we examined genome wide transcriptomic responses of the sea urchin arbacia lixula an ecosystem relevant grazer inhabiting a natural co 2 vent system in la palma canary islands spain using rna sequencing of 24 adults n 8 per treatment we compared i acute experimental exposure of ambient origin individuals to low ph ii chronic exposure by comparing ambient and vent origin populations in their native ph conditions and iii a genotype of origin comparison under shared low ph acute exposure triggered a limited transcriptional response 116 differentially expressed genes deg characterized by activation of ion transport redox regulation and nad associated metabolism in contrast chronically exposed vent origin urchins showed a tenfold increase in transcriptional changes 1053 deg reflecting metabolic reprogramming involving lipid carbohydrate and amino acid pathways and strengthened antioxidant capacity chronic low ph exposure was also associated with suppression of biomineralization and developmental genes alongside strong upregulation of collagen and extracellular matrix associated genes that may help maintain skeletal performance under reduced carbonate availability genotype of origin effects 131 degs revealed constitutive differences in metabolic redox extracellular matrix and biomineralization pathways in vent populations together these findings indicate that persistence under natural acidification involves both rapid plastic responses and sustained physiological reorganization providing mechanistic insight into how calcifying species maintain functional performance under ongoing ocean acidification continue reading short term plasticity and long term transcriptomic rewiring under natural ocean acidification in an ecosystem relevant sea urchin share this post share on facebook opens in new window facebook email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit share on linkedin opens in new window linkedin share on tumblr opens in new window tumblr share on pinterest opens in new window pinterest like this like loading impact of water quality and gear type on eastern oyster crassostrea virginica growth in narragansett bay ri published 1 july 2026 science leave a comment oyster aquaculture is expanding in rhode island yet key farming regions in the lower west passage of narragansett bay wpnb lack the in situ high temporal resolution monitoring needed to evaluate emerging stressors and support production at the same time the industry is undergoing rapid technological development aimed at improving production while reducing labor and overall costs in recent years a low maintenance alternative surface gear was introduced in wpnb however its impact on oyster performance relative to traditional cultivation methods has not been quantified this study established a 1 5 year continuous water quality time series in wpnb and paired these observations with physiological assessments of crassostrea virginica grown in three cultivation methods i e traditional surface alternative surface and bottom gear this work aimed to better understand the impact of environmental variability and gear type on oyster health growth and survival multiparameter sondes and discrete bottle samples were used to monitor water quality and calculate carbonate saturation state ω at a 4 acre oyster farm nine mesh bags containing early life stage c virginica 16 0 4 mm n 300 per bag were deployed in july 2025 with three replicate bags in each gear type subsamples n 15 from each gear type were collected over a 6 month period for morphometric measurements and scope for growth sfg determinations minimal differences in carbonate chemistry were observed among sampling sites and ω remained supersaturated ω 1 for the majority of the study period indicating that ocean acidification was not a major stressor for farmed oysters survival was highest 82 4 5 in surface gear types compared to bottom gear 27 0 58 while physical growth shell and tissue and sfg were largely similar among all gear types these results suggest that the alternative surface gear may support comparable production and product quality to traditional gear types while also reducing maintenance and labor demands overall this study provides important physiological and biological context for oyster aquaculture while informing gear selection and farm management strategies continue reading impact of water quality and gear type on eastern oyster crassostrea virginica growth in narragansett bay ri share this post share on facebook opens in new window facebook email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit share on linkedin opens in new window linkedin share on tumblr opens in new window tumblr share on pinterest opens in new window pinterest like this like loading aragonite saturation state in the east china sea during fall 2022 roles of temperature biology and mixing published 30 june 2026 science leave a comment tags chemistry field north pacific this work presents a comprehensive spatial distribution of aragonite saturation state ωara during fall 2022 across the entire shelf of the east china sea ecs a marginal sea of the north pacific our observations revealed pronounced spatial heterogeneity in ωara specifically surface ωara was higher in the southeastern ecs in 3 22 3 41 which is influenced by the taiwan warm current and the kuroshio than the northern ecs 2 23 2 60 which is affected by the yellow sea and the changjiang river the lowest ωara values 1 73 2 20 occurred beneath the mixed layer on the southeastern ecs shelf correlation analyses and a one dimensional diagnostic model identified biological activity and temperature as primary controls on the spatial variability of ωara for example on the southeastern ecs shelf within the mixed layer both biological activities and temperature increased ωara accounting for 45 and 33 of the total absolute contribution of each process while below the mixed layer these two processes decreased ωara accounting for approximately 38 and 24 of the total absolute contribution additionally water mass mixing substantially influenced ωara within interaction zones such as in the intrusion areas of the yellow sea and changjiang river waters projections indicate that under future elevated atmospheric carbon dioxide conditions rcp6 0 and rcp8 5 sea surface ωara will continue to decline but the magnitude of decline will be smaller in the northern ecs than in the southeastern ecs reflecting the carbonate system s intrinsic buffering effect continue reading aragonite saturation state in the east china sea during fall 2022 roles of temperature biology and mixing share this post share on facebook opens in new window facebook email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit share on linkedin opens in new window linkedin share on tumblr opens in new window tumblr share on pinterest opens in new window pinterest like this like loading erosion driven delayed warming and marine stress prior to the end permian mass extinction published 30 june 2026 science leave a comment tags modeling paleo regionalmodeling the end permian mass extinction epme presents an anomaly intense global warming lags the onset of the carbon isotope excursion cie by 50 000 years challenging the presumed link between carbon cycle perturbations and climate warming using biogeochemical modeling bayesian inversion and multiple proxies here we show that incorporating continental erosion as a forcing term into the hyperthermal models can resolve this decoupling enhanced erosion likely resulting from the terrestrial die off of vegetation accelerates continental weathering which buffers early carbon release and delays global warming this process also increases riverine phosphorus export to the oceans fostering gradual marine anoxia and preconditioning the oceans for the extinction event with these findings we present a coherent unifying scenario for the epme environmental dynamics furthermore our study refines the hyperthermal paradigm offering implications for future climate scenarios continue reading erosion driven delayed warming and marine stress prior to the end permian mass extinction share this post share on facebook opens in new window facebook email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit share on linkedin opens in new window linkedin share on tumblr opens in new window tumblr share on pinterest opens in new window pinterest like this like loading climate change and aquatic ecosystems impacts on salinity species survival and ecological resilience published 29 june 2026 science leave a comment tags biological response fisheries mesocosms mortality phytoplankton reproduction review salinity highlights unveils climate driven disease mechanisms across aquatic systems integrates multistressor impacts including pollution eutrophication and salinity fluctuations explores shifts in species distribution reproduction and food web dynamics highlights adaptive traits and resilience mechanisms in aquatic organisms provides science based recommendations for climate responsive management abstract climate change is rapidly transforming aquatic ecosystems posing complex environmental challenges with far reaching ecological and socio economic implications rising temperatures sea level rise altered precipitation patterns shifting hydrological regimes and sea ice loss are intensifying pressures on coastal estuarine freshwater and polar systems these stressors contribute to habitat degradation increased frequency of hypoxic events and altered species distributions crucially while some dual stressors such as warming and acidification can paradoxically increase primary producer biomass our findings reveal that this resultant biomass often accumulates as detritus rather than being efficiently transferred to higher trophic levels this observation directly challenges the simplistic assumption that more growth is invariably beneficial highlighting complex indirect effects on food web dynamics and ecosystem function ecological perturbations propagate through trophic networks resulting in biodiversity loss reduced ecosystem resilience and declining fisheries productivity thereby threatening food security and coastal livelihoods marine and freshwater organisms are increasingly exposed to multiple interacting stressors including warming acidification salinity fluctuations requiring distinct osmoregulatory strategies e g heterosmotic regulation in teleosts vs isosmotic intracellular regulation in crustaceans pollution and overexploitation these cumulative pressures can exacerbate disease outbreaks modify host pathogen dynamics and facilitate the emergence and spread of aquatic pathogens with consequences for ecosystem stability and human health in aquaculture systems climate driven stress often acts synergistically with anthropogenic disturbances amplifying production risks and economic vulnerability furthermore anthropogenic infrastructure like reservoirs can act as unintended hubs facilitating species dispersal following extreme events like floods altering community structures at the biogeochemical scale climate induced alterations in nutrient cycling primary productivity and carbon sequestration are reshaping ecosystem functioning particularly in high latitude and freshwater environments where adaptive capacity is comparatively constrained changes in food web architecture and energy transfer efficiency further compromise ecosystem services this review specifically centers on the biological and ecological mechanisms underlying these climate driven changes including organism level stress responses shifts in species interactions and alterations in pathogen dynamics recognizing the societal implications and public discourse surrounding climate change underscores the urgency of examining its tangible impacts on sensitive environments such as estuarine ecosystems which serve as critical interfaces between terrestrial and marine realms and are thus highly susceptible to both climatic shifts and human influence continue reading climate change and aquatic ecosystems impacts on salinity species survival and ecological resilience share this post share on facebook opens in new window facebook email a 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