يعرض 1 - 10 نتائج من 19 نتيجة بحث عن '"Ricardo Calado"', وقت الاستعلام: 1.26s تنقيح النتائج
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    المساهمون: Herbert-Read, James E [0000-0003-0243-4518], Thornton, Ann [0000-0002-7448-8497], Amon, Diva J [0000-0003-3044-107X], Birchenough, Silvana NR [0000-0001-5321-8108], Côté, Isabelle M [0000-0001-5368-4061], Dias, Maria P [0000-0002-7281-4391], Keith, Sally A [0000-0002-9634-2763], McKinley, Emma [0000-0002-8250-2842], Peck, Lloyd S [0000-0003-3479-6791], Defeo, Omar [0000-0001-8318-528X], Degraer, Steven [0000-0002-3159-5751], Johnston, Emma L [0000-0002-2117-366X], Macreadie, Peter I [0000-0001-7362-0882], Metaxas, Anna [0000-0002-1935-6213], Obura, David O [0000-0003-2256-6649], Piola, Alberto R [0000-0002-5003-8926], Richardson, Anthony J [0000-0002-9289-7366], Schloss, Irene R [0000-0002-5917-8925], Snelgrove, Paul VR [0000-0002-6725-0472], Thompson, Paul M [0000-0001-6195-3284], Watson, Gordon J [0000-0001-8274-7658], Worthington, Thomas A [0000-0002-8138-9075], Yasuhara, Moriaki [0000-0003-0990-1764], Apollo - University of Cambridge Repository, University of St Andrews. School of Biology, University of St Andrews. Scottish Oceans Institute, University of St Andrews. St Andrews Sustainability Institute, University of St Andrews. Coastal Resources Management Group, University of St Andrews. Sediment Ecology Research Group, University of St Andrews. Marine Alliance for Science & Technology Scotland, Repositório da Universidade de Lisboa, Suomen ympäristökeskus, The Finnish Environment Institute

    الوصف: This Marine and Coastal Horizon Scan was funded by Oceankind. S.N.R.B. is supported by EcoStar (DM048) and Cefas (My time). R.C. acknowledges FCT/MCTES for the financial support to CESAM (UIDP/50017/2020, UIDB/50017/2020, LA/P/0094/2020) through national funds. O.D. is supported by CSIC Uruguay and Inter-American Institute for Global Change Research. J.E.H.-R. is supported by the Whitten Lectureship in Marine Biology. S.A.K. is supported by a Natural Environment Research Council grant (NE/S00050X/1). P.I.M. is supported by an Australian Research Council Discovery Grant (DP200100575). D.M.P. is supported by the Marine Alliance for Science and Technology for Scotland (MASTS). A.R.P. is supported by the Inter-American Institute for Global Change Research. W.J.S. is funded by Arcadia. A.T. is supported by Oceankind. M.Y. is supported by the Deep Ocean Stewardship Initiative and bioDISCOVERY. The biodiversity of marine and coastal habitats is experiencing unprecedented change. While there are well-known drivers of these changes, such as overexploitation, climate change and pollution, there are also relatively unknown emerging issues that are poorly understood or recognized that have potentially positive or negative impacts on marine and coastal ecosystems. In this inaugural Marine and Coastal Horizon Scan, we brought together 30 scientists, policymakers and practitioners with transdisciplinary expertise in marine and coastal systems to identify new issues that are likely to have a significant impact on the functioning and conservation of marine and coastal biodiversity over the next 5–10 years. Based on a modified Delphi voting process, the final 15 issues presented were distilled from a list of 75 submitted by participants at the start of the process. These issues are grouped into three categories: ecosystem impacts, for example the impact of wildfires and the effect of poleward migration on equatorial biodiversity; resource exploitation, including an increase in the trade of fish swim bladders and increased exploitation of marine collagens; and new technologies, such as soft robotics and new biodegradable products. Our early identification of these issues and their potential impacts on marine and coastal biodiversity will support scientists, conservationists, resource managers and policymakers to address the challenges facing marine ecosystems. Postprint

    وصف الملف: application/octet-stream; application/pdf; text

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    المصدر: Journal of Applied Phycology. 33:471-480

    الوصف: Codium tomentosum is a marine green macroalga with multiple value-added applications that is being successfully used as an extractive species in sustainable integrated multi-trophic aquaculture systems. Nonetheless, growth conditions of this species at an early development phase still require optimization. The present study addresses, under controlled laboratory conditions, the effects of photoperiod (long vs. short-day) and light spectra (white, blue, and red light) on growth and pigment composition of C. tomentosum. Relative growth rate was approximately 2× higher under long-day photoperiod (average of 39.2 and 20.1% week−1 for long and short-day, respectively). Concentrations per dry weight of major pigments such as chlorophyll a (Chla) and siphonoxanthin (Siph) were significantly higher under long-day photoperiod. Relative growth rates were higher under red light, intermediate under white light, and lower under blue light. These last results were rather surprising, as Siph-Chla/Chlb light harvesting complexes of Codium have increased absorption in the blue-green region of the light spectra. Changes in carbon allocation patterns caused by the spectral composition of light and overgrowth of green microalgae in blue light cultures could explain the differences recorded for relative growth rate. Long-day photoperiod and light sources with preferential emission at the red region of the light spectra were identified as optimal for growth of C. tomentosum at early development stages. These lighting conditions can reduce the time required to reach the necessary biomass before transfer to grow-out systems. Overall, these findings can shorten production time, increase macroalgal productivity, and enhance aquaculture revenues.

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    المصدر: Marine Biodiversity. 50

    الوصف: The presence of non-indigenous species outside their home range attracts growing attention by the scientific community, as well as policy makers and common citizens. However, dispersal pathways of most non-indigenous species remain poorly understood. The association between non-indigenous and indigenous species may facilitate dispersal in non-native habitats. Identifying such associations is therefore paramount, but few studies have addressed this issue to date. The present work reports the association between the non-indigenous spider crab Pyromaia tuberculata, morphologically and molecularly identified, with the autochthonous scyphomedusa Catostylus tagi in European waters. This is the first time this widespread invasive brachyuran crab is described associated with jellyfish. In the laboratory, P. tuberculata was observed feeding on the gonadal tissues of its cnidarian host, although this behaviour needs to be confirmed in the wild. The association between P. tuberculata and C. tagi raises awareness on how the dispersal potential of this non-indigenous species may be significantly enhanced. As recommended by the Marine Strategy Framework Directive, it is important to include P. tuberculata in the European monitoring programmes of non-indigenous species. Future studies should continue to investigate the prevalence of this specific association, as well as other associations between jellyfish and non-indigenous fauna, as an early warning initiative. Researchers may benefit from ongoing citizen science projects to gather data on this overlooked pathway for dispersal of non-indigenous species.

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    المصدر: Scientific Reports
    Scientific Reports, Vol 10, Iss 1, Pp 1-13 (2020)

    الوصف: Halophytes are increasingly regarded as suitable extractive species and co-products for coastal Integrated Multi-Trophic Aquaculture (IMTA) and studying their lipidome is a valid means towards their economic valorization. Halimione portulacoides (L.) Aellen edible leaves are rich in functional lipids with nutraceutical and pharmaceutical relevance and the present study aimed to investigate the extent to which its lipidome remains unchanged under a range of dissolved inorganic nitrogen (N) and phosphorus (P) concentrations typical of aquaculture effluents. Lipidomics analysis, done by hydrophilic interaction liquid chromatography coupled to high resolution mass spectrometry, identified 175 lipid species in the lipid extract of leaves: 140 phospholipids (PLs) and 35 glycolipids (GLs). Plants irrigated with a saline solution with 20–100 mg DIN-N L−1 and 3–15.5 mg DIP-P L−1 under a 1-week hydraulic retention time displayed a relatively stable lipidome. At lower concentrations (6 mg DIN-N L−1 and 0.8 mg DIP-P L−1), plants exhibited less PLs and GLs per unit of leaves dry weight and the GLs fraction of the lipidome changed significantly. This study reveals the importance of analyzing the lipidomic profile of halophytes under different nutritional regimens in order to establish nutrient-limitation thresholds and assure production conditions that deliver a final product with a consistent lipid profile.

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    المساهمون: Repositório da Universidade de Lisboa

    المصدر: Repositório Científico de Acesso Aberto de Portugal
    Repositório Científico de Acesso Aberto de Portugal (RCAAP)
    instacron:RCAAP
    Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
    Agência para a Sociedade do Conhecimento (UMIC)-FCT-Sociedade da Informação

    الوصف: Pelagic octopods have secondarily left the seafloor and evolved a holopelagic existence. One of the most striking adaptations among a suite of related pelagic octopod families (superfamily Argonautoidea) is their associations with gelatinous zooplankton (jellyfishes and salps). Here, we report a unique interaction between a male octopod (Haliphron atlanticus) and a jellyfish (Pelagia noctiluca) at the sea surface. The oral-to-oral surface orientation of this encounter and sizes of the animals seem not to fit the explanations of camouflage, shelter, and/or transportation for the octopod or “weapons stealing” strategies observed to date in other pelagic octopods. While maneuvering the jelly, H. atlanticus appears to use the jelly’s marginal nematocystic tentacles for protection. This constitutes further evidence that all four octopod families of the Argonautoidea display various interactions with gelatinous zooplankton. info:eu-repo/semantics/publishedVersion

    وصف الملف: application/pdf

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    المساهمون: Repositório da Universidade de Lisboa

    المصدر: Repositório Científico de Acesso Aberto de Portugal
    Repositório Científico de Acesso Aberto de Portugal (RCAAP)
    instacron:RCAAP

    الوصف: Climate change and other types of environmental stress are known to increase corals’ vulnerability to bleaching, a process whereby colonies lose their colour either due to the loss of photosynthetic symbionts or their pigments. Although bleaching leaves the coral skeleton visible under its transparent tissue, not all white coral colonies display this feature. This raises the question as to whether all ‘white’-shaded colonies are indeed bleached. Within this context, Montastraea cavernosa colonies of different colour types (dark brown, light brown, bleached and white) were sampled for photobiological evaluation. Here, we show that, while the conventional spectral reflectance techniques failed to discriminate white from bleached colonies, chlorophyll fluorescence, photosynthetic pigment profile and Symbiodinium density enabled a clear distinction between these shades. Subsequently, video transects from reef monitoring surveys at Todos os Santos Bay (Brazil) revealed that the proportion of bleached and white colonies is similar, thus suggesting that current coral reef surveys may be overestimating the bleaching of M. cavernosa by nearly twofold.

    وصف الملف: application/pdf

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    المصدر: Marine Biology. 163

    الوصف: The colonization of intertidal habitats is a challenging process. During low tide, many photosynthetic organisms, including symbiotic zoanthids, can be partially exposed to air eliciting significant physiological impairments, which may ultimately dictate the rate of colonization in such environments. Within this context, the present study aims to investigate, for the first time, the effects of air exposure on the fatty acid (FA) content and photobiological parameters of Palythoa caribaeorum, by comparing emerged and immersed polyps, within the same colony, during low tide. Tidal environment did not significantly affect FA percentages, but polyps that were emerged showed lower FA content than the immersed ones. Saturated FA fraction contributed the most to those dissimilarities, followed by the highly unsaturated and polyunsaturated FA fractions. Concomitantly, polyps that were permanently immersed displayed significantly higher values of the maximum quantum yield of photosystem II (F v/F m) when compared with emerged polyps. An opposite pattern was observed regarding the indices derived from the rapid light-response curves of relative electron transport rate (α, ETRmax and E k). We argue that FA differences within each colony seem to be a consequence of impairments in carbon production with photoautotrophic origin. Our findings also suggest that emerged polyps display higher efficiency in responding to rapid light fluctuation, which seems to be a peculiar adaptation to these challenging environments. Thus, in addition to its morphological plasticity, P. caribaeorum seems to display a large trophic plasticity that may be linked with the aggressive competitive nature for vital resources in such tidal habitats and widespread distribution.

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    المصدر: Scientific Reports

    الوصف: This study was supported by PROMAR (GAC OESTE) a Portuguese instrument for fisheries and aquaculture funded by the European Fisheries Fund, within the project Percebe da Berlenga - Contributos para uma pesca sustentável (31-04-01-FEP-073) and by Fundação para a Ciência e Tecnologia (FCT) (UID/AMB/50017/2013). RA was supported by a research assistant grant through the LarvalSources project (PTDC/BIA-BIC/120483/2010) funded by FCT. European Union regulations state that consumers must be rightfully informed about the provenance of fishery products to prevent fraudulent practices. However, mislabeling of the geographical origin is a common practice. It is therefore paramount to develop forensic methods that allow all players involved in the supply chain to accurately trace the origin of seafood. In this study, trace elemental signatures (TES) of the goose barnacle Pollicipes pollicipes, collected from ten sites along the Portuguese coast, were employed to discriminate individual’s origin. Barium (Ba), boron (B), cadmium (Cd), chromium (Cr), lithium (Li), magnesium (Mg), manganese (Mn), phosphorous (P), lead (Pb), strontium (Sr) and zinc (Zn) - were quantified using Inductively Coupled Plasma−Mass Spectrometry (ICP-MS). Significant differences were recorded among locations for all elements. A regularized discriminant analysis (RDA) revealed that 83% of all individuals were correctly assigned. This study shows TES can be a reliable tool to confirm the geographic origin of goose barnacles at fine spatial resolution. Although additional studies are required to ascertain the reliability of TES on cooked specimens and the temporal stability of the signature, the approach holds great promise for the management of goose barnacles fisheries, enforcement of conservation policies and assurance in accurate labeling. info:eu-repo/semantics/publishedVersion

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    المساهمون: Repositório da Universidade de Lisboa

    المصدر: Repositório Científico de Acesso Aberto de Portugal
    Repositório Científico de Acesso Aberto de Portugal (RCAAP)
    instacron:RCAAP

    الوصف: Sharks occupy high trophic levels in marine habitats and play a key role in the structure and function of marine communities. Their populations have been declining worldwide by ≥90 %, and their adaptive potential to future ocean conditions is believed to be limiting. Here we experimentally exposed recently hatched bamboo shark (Chiloscyllium punctatum) to the combined effects of tropical ocean warming (+4; 30 °C) and acidification (ΔpH 0.5) and investigated the respiratory, neuronal and antioxidant enzymatic machinery responses. Thirty days post-hatching, juvenile sharks revealed a significant decrease in brain aerobic potential (citrate synthase activity), in opposition to the anaerobic capacity (lactate dehydrogenase). Also, an array of antioxidant enzymes (glutathione S-transferase, superoxide dismutase activity and catalase) acted in concert to detoxify ROS, but this significant upregulation was not enough to minimize the increase in brain’s peroxidative damage and cholinergic neurotransmission. We argue that the future conditions may elicit deleterious deficiencies in sharks’ critical biological processes which, at the long-term, may have detrimental cascading effects at population and ecosystem levels.

    وصف الملف: application/pdf