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  • 1
    Publication Date: 2021-05-19
    Description: Il est connu que les ports soumis à un trafic maritime intense réceptionnent éventuellement les eaux de ballast des navires en provenance de diverses contrées océaniques. De part le monde, le transfert et l’invasion de plusieurs espèces nuisibles via le déversement des eaux de ballast et le fouling des coques des navires ont été amplement mis en cause ces derniers temps. Ces introductions peuvent causer de nombreux dégâts aux secteurs avoisinants et notamment dans les zones de production des coquillages surtout si les espèces introduites sont constituées de phytoplancton toxique. Au terme de 4 années de suivi de la qualité phytoplanctonique des milieux portuaires du golfe de Gabès, nous avons pu inventorier certaines espèces toxiques pour la plupart nouvelles pour la flore phytoplanctonique du golfe à savoir l’Alexandrium margalefi Balech, l’A. fundyense Balech, l’A. insuetum Balech, l’A. ostenfeldii Balech et tangen, le Gymnodinium catenaum Graham et le Karenia papilionacea Haywood et Steidinger. Dans cette étude nous avons essayé de suivre l’évolution de ces espèces, du milieu portuaire vers les zones avoisinantes de production des coquillages. La nécessité d’instaurer un programme d’étude et de surveillance de ces transferts apparaît donc imminente.
    Description: أثبتت عديد الدراسات أن البواخر و مياه "بلاست" يمكن أن تتسبب في نقل وانتشار عدة كائنات جديدة من محيط إلى آخر. الطحالب المهجرية هي أحسن صورة لهذا الانتقال إلا أنها يمكن أن تتسبب في عدة إشكاليات بيئية أو حتى صحية و بالتالي اقتصادية لم تستطيع أن تفرزه من سموم. لمتابعة مدى انتشار و تأقلم الطحالب المهجرية السامة وغزوها لمناطق إنتاج القوقعيات في خليج قابس قمنا بمتابعة مياه المواني و دراسة هذه الكائنات بالجهة لمدة تقارب 4 سنوات وحددنا النوعيات السامة و كيفية تنقلها من موقع إلى آخر.
    Description: There is a strong evidence that harbours submitted to an intense maritime traffic receive ballast waters of ship possibly coming from various oceanic regions and parts of the world. The transfer and the invasion of several harmful species via ballast waters tipping and ship fouling have been amply summoned these last times. These introductions can cause many damages to the neighbouring sectors and particularly in zones of shellfish production mainly if the introduced species are constituted of harmful phytoplankton. At the end of a 4 years survey for phytoplankton quality of harbours surrounding the Gabes gulf, some toxic species were inventoried, some of them being new ones in the context of the Gulf phytoplankton flora such as Alexandrium margalefi, A. fundyense, A. insuetum, A. ostenfeldii, Gymnodinium catenaum and Karenia papilionacea. In this survey we tried to follow the evolution of these species, from the harbours areas toward bordering shellfish production areas. There is an urgent need to set up a monitoring program for these transfers .
    Description: Published
    Description: Alexandrium insuetum, Alexandrium ostenfeldii, Alexandrium undyense, Gymnodinium catenaum, Karenia papilionacea
    Keywords: Ballast ; Ecology ; Ecosystems ; Eutrophication ; Phytoplankton ; Pollution monitoring ; Toxicity
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 2
    Publication Date: 2021-05-19
    Description: Notas sobre la ecología de los lagartos de la isla Malpelo, Colombia. Observaciones de dos de las especies endémicas de lagartos de la isla Malpelo ofrecen características poco conocidas de su historia natural, ecología y estado poblacional. Anolis agassizi, el lagarto más abundante y ampliamente distribuido, se alimenta principalmente de insectos y excretas de aves marinas. Duerme sobre rocas grandes, en las paredes de los cerros o sobre estructuras construidas por el hombre y, aunque no defiende sitios de percha como la mayoría de Anolis, muestra predilección por sitios elevados en donde, entre otras actividades, realiza sus cópulas. Diploglossus millepunctatus, el lagarto de mayor tamaño corporal y menor abundancia, es un depredador-oportunista y carroñero que mantiene una relación inusual con el cangrejo terrestre de la Isla (Johngarthia malpilensis), al cual no solo depreda activamente, sino con el que también compite por alimentos. El comportamiento, mayor densidad, tamaño corporal y peso de los individuos de D. millepunctatus cercanos a las cabañas, sugieren que estos lagartos se han condicionado a la presencia de los humanos, al consumir periódicamente las sobras de sus comidas.
    Description: Observations of two of the endemic species of lizards of Malpelo Island provide new information on their natural history, ecology, and population size. Anolis agassizi, the most abundant and broadly distributed lizard, feeds mainly on insects and excrements of marine birds. It sleeps on large rocks, surfaces on hills or on man-made structures and, although it does not defend perch sites like most Anolis do, it does show preferences for high perches where, among other activities, it carries out copulation. Diploglossus millepunctatus, the largest and least abundant lizard, is an opportunistic-predator and scavenger that has a remarkable relationship with the land crab of the island (Johngarthia malpilensis) which it not only eats, but also competes with it for food. Behavior, higher density, larger body size and weight of individual D. millepunctatus living close to cabins suggest that these lizards accommodate to the presence of people by feeding on left-over food.
    Description: INVEMAR
    Description: Published
    Description: Anolis agassizi; Diploglossus millepunctatus; General behavior; Population status
    Keywords: Ecology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 3
    Publication Date: 2021-05-19
    Description: La présente étude a porté sur une anomalie morphologique observée chez la palourde européenne Ruditapes decussatus collectée dans le lac nord de Tunis et des perturbations coquillières relevées chez la datte de mer Lithophaga lithophaga prélevée dans la baie de Bizerte. L’examen de la partie molle et de la coquille de ces deux espèces de bivalves a révélé une malformation chez la palourde européenne qui consiste en la différenciation de deux siphons inhalant et exhalant surnuméraires prenant naissance des deux siphons habituels, complètement séparés, inhalant et exhalant. Les siphons en forme de Y possèdent ainsi 4 ouvertures fonctionnelles au lieu de 2. Chez la datte de mer Lithophaga lithophaga, nous avons relevé la présence de perturbations coquillières qui touchent la valve du côté externe et interne. Nous avons mis en évidence la présence d’annélides perforateurs et de sipunculiens vivant à l’intérieur de galeries intravalvaires creusées vraisemblablement par ces invertébrés. La fine épaisseur de la coquille pourvue de galeries entraine des malformations morphologiques coquillières observées chez ce bivalve lithophage.
    Description: تبرز هذه الدراسة تشوهات لاحظناها في لحم القفالة Ruditapes decussatus التي تم التقاطها في بحيرة تونس الشمالية كما تسجل بعض الاضطرابات التي تخص قوقعة بلح البحر Lithophaga lithophaga المتأتية من شرم بنزرت. فبالنسبة للقفالة، لاحظنا ظهور مثاعب إضافية استنشاقية واستنثارية ثانية تبرز من المثاعب الأصلية المنفصلة حيث يبدو كل مثعب منهما على شكل «Y » بفتحتين في مؤخرتهما الخلفيتين. أما بالنسبة لبلح البحر، فقد لوحظت اضطرابات على مستوى قشرة قوقعية بلح البحر من داخله و خارجه على حد سواء، وهذه الإضطرابات ناتجة عن وجود كائنات بحرية من الافقاريات مثل ديدان الفول السوداني وديدان حلقية التي تسكن في أنفاق محفورة داخل قشرة القوقعية. إن شفافية سمك قوقعة بلح البحر يؤدي، عند وجود كائنات حية تعيش فيها إلى إحداث تشوهات في الشكل الداخلي والخارجي لقوقعية بلح البحر.
    Description: The present study concerned a morphological abnormality observed at the European clam Ruditapes decussatus collected in the north lake of Tunis and the shell disturbances raised to Lithophaga lithophaga taken in the bay of Bizerta. The examination of the soft part and the shell of these two sorts of bivalves revealed a deformation at the European clam who consists of the differentiation of two siphons inhaling and exhaling originating supernumeraries both usual siphons, siphons in the form of Y so possesses 4 functional openings instead of 2. To the sea date Lithophaga lithophaga, we raised the presence of shell disturbances which get the valve of the external and internal side. We put in evidence the presence of perforating annelids and sipunculians living inside intravalves galleries dug credibly by these invertebrates. The soft thickness of the shell provided with galleries entails morphological shell deformations and fragility observed to this lithophagous bivalve.
    Description: Published
    Keywords: Lithophaga lithophaga ; Ruditapes decussatus ; Abnormalities ; Animal morphology ; Ecology ; Shellfish ; Shells
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 4
    Publication Date: 2021-05-19
    Description: التطورات السريعة للتأريخ العرقي للإسفنج ، كذاك الأعمال الحديثة التي أحدثت في البلاد التونسية في علم التصنيف و علم البيئة لهذه المجموعة قد شجعتنا لإعادة النظر في التسميات. هذا التجديد مكننا أيضا اعتبار الإضافات و التسجيلات الأخيرة.
    Description: Les progrès rapides de la phylogénie des éponges en général et celle des démoponges en particulier, ainsi que les travaux récents entamés en Tunisie sur la taxonomie et l’écologie de ce groupe, nous ont encouragé à revoir leur nomenclature. Cette mise a jour nous a aussi permis de tenir compte des derniers ajouts et signalisations en Tunisie.
    Description: Fast progress of the phylogeny of sponges in general and that of the demoponges in particular, as well as recent works on the taxonomy and the ecology of this group in Tunisia, encouraged us to re-examine their nomenclature. This update also allowed us to take account of the last additions and indications in Tunisia.
    Description: Published
    Keywords: Porifera ; Taxonomy ; Terminology ; Ecology ; Phylogeny ; Sponges ; Ecology ; Phylogeny ; Sponges ; Taxonomy ; Terminology
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 5
    Publication Date: 2021-05-19
    Description: L’étude des résistances vis-à-vis de différentes substances antibiotiques pour des espèces bactériennes (aérobies et anaérobies) isolées chez Mytilus galloprovincialis a été réalisée par la méthode standard de l’antibiogramme. Ainsi, 50 souches bactériennes aérobies et 20 souches anaérobies appartenant à plus de 25 espèces différentes ont été isolées et testées. Les résultats obtenus montrent des profils à plusieurs résistances vis-à-vis des différentes familles d’antibiotiques testés. Les résultats obtenus révèlent des profils à 12 résistances différentes notamment chez l’espèce anaérobie (Propioni acnes). Aussi, chez l’espèce aérobie pré dominante ( Aeromonas hydrophila) nous avons mis en évidence au moins 6 antibiotypes différents. Ces résultats montrent la prépondérance de bactéries multirésistantes aux antibiotiques hébergeant dans la moule Mytilus galloprovincialis prélevée d’un milieu naturel (la lagune de Bizerte).
    Description: The sensitivity of various aerobic and anaerobic bacterial species isolated from Mytilus galloprovincialis to different types of antibiotics. Thus, sensitivity of 50 aerobic and 20 anaerobic species was tested to 15 antibiotics including (betalactams, aminosids, cephalo porins, phenicols, cyclins, macrolids, nitrofurans, sulfamids, rifamycins). According to results obtained, all strains tested demonstrate resistances profiles to 3 to 12 antibiotics tested. Multi resistant profiles to 12 different antibiotics were detected for the anaerobic species (Propioni acnes). For the main aerobic species isolated, Aeromonas hydrophila we described more than 6 different antibiotypes. According to these results, it seems that the multi resistant antibiotic bacteria were well spread in Mytilus galloprovincialis brought from natural Tunisian lagoon ecosystems (Lagoon of Bizerta)..
    Description: قمنا بدراسة مقاومة مجموعات من أنواع البكتيريات الهوائية واللاهوائية تم عزلها من محار)Mytilus galloprovincialis(، للمضادات الحيوية من مختلف الأصناف. ولقد تم عزل ودراسة 70 من مختلف الأجذال البكتيرية والتي تم تعريفها بالطرق البيوكيميائية. وقد أثبتت النتائج المتحصل عليها وجود رسوم طيفية ذات مقاومات متعددة لـ 12 مضاد حيوي لدى البكتيريا اللاهوائية من نوعPropioni acnes. كما قمنا بعزل مكثف للبكتيريا من نوع Aeromonas hydrophila، وثبت لدى هذا النوع من البكتيريا وجود أكثر من ستة رسوم طيفية مختلفة. وتبين هذه النتائج كثافة تواجد البكتيريات متعددة المقاومة لدى المحارMytilus galloprovincialis المتأتي من بحيرة بنزرت، وذلك يشمل كل أنواع البكتيريا المعزولة (أكثر من 25 أصناف مختلفة).
    Description: Published
    Keywords: Bacteria ; Mytilus galloprovincialis ; Antibiotics ; Bacterial diseases ; Control resistance ; Ecology ; Eutrophication ; Indicator species ; Microbiological analysis
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
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  • 6
    Publication Date: 2022-05-25
    Description: © The Author(s), 2012. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Scientific Reports 2 (2012): 553, doi:10.1038/srep00553.
    Description: Sea surface temperature imagery, satellite altimetry, and a surface drifter track reveal an unusual tilt in the Gulf Stream path that brought the Gulf Stream to 39.9°N near the Middle Atlantic Bight shelfbreak—200 km north of its mean position—in October 2011, while a large meander brought Gulf Stream water within 12 km of the shelfbreak in December 2011. Near-bottom temperature measurements from lobster traps on the outer continental shelf south of New England show distinct warming events (temperature increases exceeding 6°C) in November and December 2011. Moored profiler measurements over the continental slope show high salinities and temperatures, suggesting that the warm water on the continental shelf originated in the Gulf Stream. The combination of unusual water properties over the shelf and slope in late fall and the subsequent mild winter may affect seasonal stratification and habitat selection for marine life over the continental shelf in 2012.
    Description: Profiler data were made available by the Ocean Observatory Initiative (OOI) during the construction phase of the project. The OOI is funded by the National Science Foundation and managed by the Consortium for Ocean Leadership. Drifter data were provided by Tim Shaw and David Calhoun at Cape Fear Community College.GGGwas supported by NSFGrant OCE-1129125. RET was supported by the Postdoctoral Scholar Program at the Woods Hole Oceanographic Institution, with funding provided by the Cooperative Institute for the North Atlantic Region. MA was supported by the Penzance Endowed Fund in Support of Assistant Scientists.
    Keywords: Ecology ; Climate change ; Atmospheric science ; Oceanography
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 7
    Publication Date: 2022-05-25
    Description: Author Posting. © The Natural History Museum, 2012. This article is posted here by permission of Taylor & Francis for reuse for non-commercial purposes only. The definitive version was published in Systematics and Biodiversity 10 (2012): 1-20, doi:10.1080/14772000.2012.665095.
    Description: The time is ripe for a comprehensive mission to explore and document Earth's species. This calls for a campaign to educate and inspire the next generation of professional and citizen species explorers, investments in cyber-infrastructure and collections to meet the unique needs of the producers and consumers of taxonomic information, and the formation and coordination of a multi-institutional, international, transdisciplinary community of researchers, scholars and engineers with the shared objective of creating a comprehensive inventory of species and detailed map of the biosphere. We conclude that an ambitious goal to describe 10 million species in less than 50 years is attainable based on the strength of 250 years of progress, worldwide collections, existing experts, technological innovation and collaborative teamwork. Existing digitization projects are overcoming obstacles of the past, facilitating collaboration and mobilizing literature, data, images and specimens through cyber technologies. Charting the biosphere is enormously complex, yet necessary expertise can be found through partnerships with engineers, information scientists, sociologists, ecologists, climate scientists, conservation biologists, industrial project managers and taxon specialists, from agrostologists to zoophytologists. Benefits to society of the proposed mission would be profound, immediate and enduring, from detection of early responses of flora and fauna to climate change to opening access to evolutionary designs for solutions to countless practical problems. The impacts on the biodiversity, environmental and evolutionary sciences would be transformative, from ecosystem models calibrated in detail to comprehensive understanding of the origin and evolution of life over its 3.8 billion year history. The resultant cyber-enabled taxonomy, or cybertaxonomy, would open access to biodiversity data to developing nations, assure access to reliable data about species, and change how scientists and citizens alike access, use and think about biological diversity information.
    Description: Funds for the ‘Sustain What?’ workshop were provided by Arizona State University (Office of the President, International Institute for Species Exploration and Global Institute of Sustainability) and a grant from the US National Science Foundation (DEB-1102500 to QDW). Further support was provided by the College of Liberal Arts and Sciences, Arizona State University and NSF (DEB-0316614 to SK).
    Keywords: Biodiversity ; Bioinformatics ; Biomimicry ; Biosphere ; Conservation ; Cyberinfrastructure ; Ecology ; Evolution ; International collaboration ; Organization of science ; Origins ; Species ; Sustainability ; Systematics ; Taxonomy ; Team work
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 8
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    Massachusetts Institute of Technology and Woods Hole Oceanographic Institution
    Publication Date: 2022-05-25
    Description: Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution June 1989
    Description: This work comprises three detailed studies of ontogeny and ecology. In the first chapter, four living species of the ostracode genus Cyprideis were studied both morphologically and ecologically to determine whether differences in age at maturity are correlated with heterochrony as expected; accelerated maturity should yield generalized morphology and small size, while delayed maturity should produce specialized morphology and large size. Two of the four species show the expected pattern, the other two do not. Cyprideis does not support the generalization that life-history evolution causes heterochrony, and casts doubt on the inference of life-history evolution from heterochrony where the data are drawn exclusively from extinct forms. In the second chapter, populations of Globorotalia menardii and G. tumida were subjected to careful morphological analysis; the stable-isotopic composition of the growth stages revealed that both species inhabit the upper fifty meters of the ocean, descending to deeper water (75-l00m) for the emplacement of an enveloping calcite crust. The third chapter shows a simple relationship between proloculus size and rate of chamber expansion in the polar planktonic foraminifer Neogloboquadrina pachyderma. The consequences for morphology of variations in ontogeny can be used to suggest ways of selecting specimens that minimize ontogenetic variations in shell chemistry.
    Keywords: Ecology ; Paleontology ; Ontogeny
    Repository Name: Woods Hole Open Access Server
    Type: Thesis
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  • 9
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    Nature Publishing Group (NPG)
    Publication Date: 2012-11-29
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2012 Nov 22;491(7425):496.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23189323" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aquatic Organisms/drug effects ; Ecology ; *Environmental Restoration and Remediation/economics/legislation & ; jurisprudence/trends ; Ethinyl Estradiol/adverse effects/analysis ; Fishes/abnormalities ; Great Britain ; International Cooperation ; *Water Purification/economics/legislation & jurisprudence ; *Water Supply/economics/legislation & jurisprudence
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 10
    Publication Date: 2012-01-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Florens, F B Vincent -- England -- Nature. 2012 Jan 4;481(7379):29. doi: 10.1038/481029b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22222742" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; Conservation of Natural Resources/*legislation & jurisprudence ; Ecology ; Environmental Policy/*legislation & jurisprudence ; Mauritius
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 11
    Publication Date: 2012-06-09
    Description: Evidence is mounting that extinctions are altering key processes important to the productivity and sustainability of Earth's ecosystems. Further species loss will accelerate change in ecosystem processes, but it is unclear how these effects compare to the direct effects of other forms of environmental change that are both driving diversity loss and altering ecosystem function. Here we use a suite of meta-analyses of published data to show that the effects of species loss on productivity and decomposition--two processes important in all ecosystems--are of comparable magnitude to the effects of many other global environmental changes. In experiments, intermediate levels of species loss (21-40%) reduced plant production by 5-10%, comparable to previously documented effects of ultraviolet radiation and climate warming. Higher levels of extinction (41-60%) had effects rivalling those of ozone, acidification, elevated CO(2) and nutrient pollution. At intermediate levels, species loss generally had equal or greater effects on decomposition than did elevated CO(2) and nitrogen addition. The identity of species lost also had a large effect on changes in productivity and decomposition, generating a wide range of plausible outcomes for extinction. Despite the need for more studies on interactive effects of diversity loss and environmental changes, our analyses clearly show that the ecosystem consequences of local species loss are as quantitatively significant as the direct effects of several global change stressors that have mobilized major international concern and remediation efforts.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hooper, David U -- Adair, E Carol -- Cardinale, Bradley J -- Byrnes, Jarrett E K -- Hungate, Bruce A -- Matulich, Kristin L -- Gonzalez, Andrew -- Duffy, J Emmett -- Gamfeldt, Lars -- O'Connor, Mary I -- England -- Nature. 2012 May 2;486(7401):105-8. doi: 10.1038/nature11118.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Western Washington University, Bellingham, Washington 98225-9160, USA. hooper@biol.wwu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22678289" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biodiversity ; Ecology ; *Ecosystem ; *Extinction, Biological ; Models, Biological
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 12
    Publication Date: 2012-10-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tollefson, Jeff -- England -- Nature. 2012 Oct 25;490(7421):458-9. doi: 10.1038/490458a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23099379" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aquatic Organisms/metabolism ; Canada ; Carbon Dioxide/metabolism ; *Carbon Sequestration ; Ecology ; Environmental Policy/*legislation & jurisprudence ; Oceans and Seas ; Phytoplankton/growth & development/metabolism ; Politics ; Salmon/*growth & development ; Seawater/*chemistry ; Uncertainty
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 13
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    Nature Publishing Group (NPG)
    Publication Date: 2012-04-07
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qiu, Jane -- England -- Nature. 2012 Apr 2;484(7392):19. doi: 10.1038/484019a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22481333" target="_blank"〉PubMed〈/a〉
    Keywords: *Altitude ; Ecology ; Global Warming/*statistics & numerical data ; *Ice Cover ; *Research/trends ; Tibet ; Water Supply/*analysis
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 14
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    Nature Publishing Group (NPG)
    Publication Date: 2012-02-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schrope, Mark -- England -- Nature. 2012 Feb 1;482(7383):20-1. doi: 10.1038/482020a.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22297950" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aquatic Organisms/*growth & development/isolation & purification ; Cnidaria/*growth & development ; Ecology ; Internationality ; Marine Biology ; Population Growth
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 15
    Publication Date: 2012-06-23
    Description: Complex networks of interactions are ubiquitous and are particularly important in ecological communities, in which large numbers of species exhibit negative (for example, competition or predation) and positive (for example, mutualism) interactions with one another. Nestedness in mutualistic ecological networks is the tendency for ecological specialists to interact with a subset of species that also interact with more generalist species. Recent mathematical and computational analysis has suggested that such nestedness increases species richness. By examining previous results and applying computational approaches to 59 empirical data sets representing mutualistic plant-pollinator networks, we show that this statement is incorrect. A simpler metric-the number of mutualistic partners a species has-is a much better predictor of individual species survival and hence, community persistence. Nestedness is, at best, a secondary covariate rather than a causative factor for biodiversity in mutualistic communities. Analysis of complex networks should be accompanied by analysis of simpler, underpinning mechanisms that drive multiple higher-order network properties.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉James, Alex -- Pitchford, Jonathan W -- Plank, Michael J -- England -- Nature. 2012 Jul 12;487(7406):227-30. doi: 10.1038/nature11214.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biomathematics Research Centre, University of Canterbury, Private Bag 4800, Christchurch 8040, New Zealand. alex.james@canterbury.ac.nz〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22722863" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biodiversity ; Ecology ; *Ecosystem ; *Models, Theoretical
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 16
    Publication Date: 2012-04-27
    Description: Numerous reports have emphasized the need for major changes in the global food system: agriculture must meet the twin challenge of feeding a growing population, with rising demand for meat and high-calorie diets, while simultaneously minimizing its global environmental impacts. Organic farming-a system aimed at producing food with minimal harm to ecosystems, animals or humans-is often proposed as a solution. However, critics argue that organic agriculture may have lower yields and would therefore need more land to produce the same amount of food as conventional farms, resulting in more widespread deforestation and biodiversity loss, and thus undermining the environmental benefits of organic practices. Here we use a comprehensive meta-analysis to examine the relative yield performance of organic and conventional farming systems globally. Our analysis of available data shows that, overall, organic yields are typically lower than conventional yields. But these yield differences are highly contextual, depending on system and site characteristics, and range from 5% lower organic yields (rain-fed legumes and perennials on weak-acidic to weak-alkaline soils), 13% lower yields (when best organic practices are used), to 34% lower yields (when the conventional and organic systems are most comparable). Under certain conditions-that is, with good management practices, particular crop types and growing conditions-organic systems can thus nearly match conventional yields, whereas under others it at present cannot. To establish organic agriculture as an important tool in sustainable food production, the factors limiting organic yields need to be more fully understood, alongside assessments of the many social, environmental and economic benefits of organic farming systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seufert, Verena -- Ramankutty, Navin -- Foley, Jonathan A -- England -- Nature. 2012 May 10;485(7397):229-32. doi: 10.1038/nature11069.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geography and Global Environmental and Climate Change Center, McGill University, Montreal, Quebec H2T 3A3, Canada. verena.seufert@mail.mcgill.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22535250" target="_blank"〉PubMed〈/a〉
    Keywords: Agricultural Irrigation ; Agriculture/*methods ; Animals ; *Biomass ; Conservation of Natural Resources/*methods ; Crops, Agricultural/classification/growth & development ; Developed Countries ; Developing Countries ; Ecology ; Ecosystem ; Food Supply/*statistics & numerical data ; Food, Organic/supply & distribution ; Forestry ; Humans ; Hydrogen-Ion Concentration ; Organic Agriculture/*methods ; Population Growth ; Soil/analysis/chemistry ; Time Factors
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 17
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    Nature Publishing Group (NPG)
    Publication Date: 2012-03-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉England -- Nature. 2012 Mar 7;483(7388):123-4. doi: 10.1038/483123b.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22398516" target="_blank"〉PubMed〈/a〉
    Keywords: Ecology ; Great Britain ; History, 20th Century ; Internationality ; National Socialism/history ; Physics/history ; *Politics ; Religion and Science ; *Science
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 18
    Publication Date: 2012-06-08
    Description: The human-microbial ecosystem plays a variety of important roles in human health and disease. Each person can be viewed as an island-like "patch" of habitat occupied by microbial assemblages formed by the fundamental processes of community ecology: dispersal, local diversification, environmental selection, and ecological drift. Community assembly theory, and metacommunity theory in particular, provides a framework for understanding the ecological dynamics of the human microbiome, such as compositional variability within and between hosts. We explore three core scenarios of human microbiome assembly: development in infants, representing assembly in previously unoccupied habitats; recovery from antibiotics, representing assembly after disturbance; and invasion by pathogens, representing assembly in the context of invasive species. Judicious application of ecological theory may lead to improved strategies for restoring and maintaining the microbiota and the crucial health-associated ecosystem services that it provides.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4208626/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4208626/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Costello, Elizabeth K -- Stagaman, Keaton -- Dethlefsen, Les -- Bohannan, Brendan J M -- Relman, David A -- DP1 OD000964/OD/NIH HHS/ -- DP1OD000964/OD/NIH HHS/ -- R01 GM095385/GM/NIGMS NIH HHS/ -- R01 OD011116/OD/NIH HHS/ -- R01GM095385/GM/NIGMS NIH HHS/ -- T32 GM007413/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2012 Jun 8;336(6086):1255-62. doi: 10.1126/science.1224203. Epub 2012 Jun 6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22674335" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anti-Bacterial Agents/pharmacology/*therapeutic use ; Bacterial Infections/*microbiology ; Biodiversity ; Ecology ; *Ecosystem ; Gastrointestinal Tract/*microbiology ; *Host-Pathogen Interactions ; Humans ; Infant, Newborn ; *Metagenome ; Selection, Genetic ; Symbiosis
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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