Invasion success of a Lessepsian symbiont-bearing foraminifera linked to high dispersal ability, preadaptation and suppression of sexual reproduction

Among the most successful Lessepsian invaders is the symbiont-bearing benthic foraminifera Amphistegina lobifera. In its newly conquered habitat, this prolific calcifier and ecosystem engineer is exposed to environmental conditions that exceed the range of its native habitat. To disentangle which processes facilitated the invasion success of A. lobifera into the Mediterranean Sea we analyzed a ~ 1400 bp sequence fragment covering the SSU and ITS gene markers to compare the populations from its native regions and along the invasion gradient. The genetic variability was studied at four levels: intra-genomic, population, regional and geographical. We observed that the invasion is not associated with genetic differentiation, but the invasive populations show a distinct suppression of intra-genomic variability among the multiple copies of the rRNA gene. A reduced genetic diversity compared to the Indopacific is observed already in the Red Sea populations and their high dispersal potential into the Mediterranean appears consistent with a bridgehead effect resulting from the postglacial expansion from the Indian Ocean into the Red Sea. We conclude that the genetic structure of the invasive populations reflects two processes: high dispersal ability of the Red Sea source population pre-adapted to Mediterranean conditions and a likely suppression of sexual reproduction in the invader. This discovery provides a new perspective on the cost of invasion in marine protists: The success of the invasive A. lobifera in the Mediterranean Sea comes at the cost of abandonment of sexual reproduction

Control of Vibrio vulnificus proliferation in the Baltic Sea through eutrophication and algal bloom management

Due to climate change the pathogenic bacterium Vibrio vulnificus proliferates along brackish coastlines, posing risks to public health, tourism, and aquaculture. Here we investigated previously suggested regulation measures to reduce the prevalence of V. vulnificus, locally through seagrass and regionally through the reduction of eutrophication and consequential formation of algal blooms. Field samples collected in the summer of 2021 covered the salinity and eutrophication gradients of the Baltic Sea, one of the largest brackish areas worldwide. Physico-, biological- and hydrochemical parameters were measured and variables explaining V. vulnificus occurrence were identified by machine learning. The best V. vulnificus predictors were eutrophication-related features, such as particulate organic carbon and nitrogen, as well as occurrence of potential phytoplankton blooms and associated species. V. vulnificus abundance did not vary significantly between vegetated and non-vegetated areas. Thus, reducing nutrient inputs could be an effective method to control V. vulnificus populations in eutrophied brackish coast

Roles played by carbene substituents during ligand transfer reactions between tungsten fischer carbene complexes and [Pt(COD)Cl2]

Please read abstract in the article.RESEARCH DATA FOR THE ARTICLE: Available at Cambridge Crystallographic Data Center. Crystallographic data: CCDC 1917582: Experimental Crystal Structure Determination (https://www.ccdc.cam.ac.uk/structures/search?id=doi:10.5517/ccdc.csd.cc22cdhc&sid=DataCite)CCDC 1917583: Experimental Crystal Structure Determination (https://www.ccdc.cam.ac.uk/structures/search?id=doi:10.5517/ccdc.csd.cc22cdjd&sid=DataCite)CCDC 1917581: Experimental Crystal Structure Determination (https://www.ccdc.cam.ac.uk/structures/search?id=doi:10.5517/ccdc.csd.cc22cdgb&sid=DataCite)The Alexander von Humboldt Foundation; the University of Pretoria and the National Research Foundation (SA).http://www.elsevier.com/locate/jorganchem2022-10-01hj2022Chemistr

With a Little Help from My Friends: Forty Years of Fruitful Chemical Collaborations

Article discussing forty years of fruitful chemical collaborations and the author's perspective on collaborative research in eight different areas of organic and theoretical chemistry

Impacts of climate change on marine resources in the Pacific Island region

Springer Nature Switzerland AG 2020. In the Pacific Island region, marine resources make vital contributions to food security, livelihoods and economic development. Climate change is expected to have profound effects on the status and distribution of coastal and oceanic habitats, the fish and invertebrates they support and, as a result, the communities and industries that depend on these resources. To prepare for and respond to these impacts-and ensure the ongoing sustainability of marine ecosystems, and the communities and industries that rely on them economically and culturally-it is necessary to understand the main impacts and identify effective adaptation actions. In particular, declines in coral reef habitats and associated coastal fisheries productivity, more eastward distribution of tuna and impacts of more intense storms and rainfall on infrastructure are expected to present the greatest challenges for Pacific communities and economies. Some species of sharks and rays, and aquaculture commodities with calcareous shells, will also be impacted by habitat degradation, ecosystem changes, increasing temperature and ocean acidification. The projected declines in coastal fish and invertebrate populations will widen the gap between fish needed by growing human populations and sustainable harvests from coastal fisheries, with shortages expected in some nations (e.g. Papua New Guinea, Solomon Islands) by 2035. There will also be a need to diversify livelihoods based on fisheries, aquaculture and tourism because some of these operations are expected to be negatively affected by climate change. In some cases, building the resilience of Pacific communities to climate change will involve reducing dependence on, or finding alternatives, vulnerable marine resources

Impacts of climate change on marine resources in the Pacific Island region

In the Pacific Island region, marine resources make vital contributions to food security, livelihoods and economic development. Climate change is expected to have profound effects on the status and distribution of coastal and oceanic habitats, the fish and invertebrates they support and, as a result, the communities and industries that depend on these resources. To prepare for and respond to these impacts—and ensure the ongoing sustainability of marine ecosystems, and the communities and industries that rely on them economically and culturally—it is necessary to understand the main impacts and identify effective adaptation actions. In particular, declines in coral reef habitats and associated coastal fisheries productivity, more eastward distribution of tuna and impacts of more intense storms and rainfall on infrastructure are expected to present the greatest challenges for Pacific communities and economies. Some species of sharks and rays, and aquaculture commodities with calcareous shells, will also be impacted by habitat degradation, ecosystem changes, increasing temperature and ocean acidification. The projected declines in coastal fish and invertebrate populations will widen the gap between fish needed by growing human populations and sustainable harvests from coastal fisheries, with shortages expected in some nations (e.g. Papua New Guinea, Solomon Islands) by 2035. There will also be a need to diversify livelihoods based on fisheries, aquaculture and tourism because some of these operations are expected to be negatively affected by climate change. In some cases, building the resilience of Pacific communities to climate change will involve reducing dependence on, or finding alternatives, vulnerable marine resources