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  • Articles  (991,378)
  • 2020-2024  (40,821)
  • 1980-1984  (950,557)
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  • 1
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    Informe : Los estudios genéticos en la merluza Merluccius hubbsi (Marini 1933) entre los 32°S y los 50°S de latitud. Análisis de la información genética generada en la DINARA. (2024)
    DINARA | Montevideo, Uruguay
    Details
    Publication Date: 2024-07-01
    Description: PNUD
    Description: Unpublished
    Description: Non Refereed
    Keywords: ASFA_2015::P::Population genetics ; ASFA_2015::H::Hake fisheries
    Repository Name: AquaDocs
    Type: Report
    Format: 21pp.
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  • 2
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    Análisis del desembarque de Condrictios por la flota de arrastre costero uruguaya en el Río de la Plata y Zona Común de Peca. Año 2012 (2024)
    DINARA | Montevideo, Uruguay
    Details
    Publication Date: 2024-07-01
    Description: Se analizó la información de desembarque proveniente de los partes de pesca de la flota industrial costera en el año 2012 para las principales especies de Condrictios. En dicho año la flota realizó 984 viajes de pesca y un total de 8.471 lances en el área del Río de la Plata (RP) y la Zona Común de Pesca (ZCP). Las especies de Condrictios con mayor volumen desembarcado fueron el gatuzo Mustelus schmitti (254 t), el angelito Squatina guggenheim (115 t) y la raya lisa Rioraja agassizi (53 t), totalizando las tres especies el 92% del volumen desembarcado de Condrictios. Un total de 434 t fue desembarcado dentro de la categoría “Varios”, la cual puede enmascarar capturas de cualquier especie. Las épocas del año con mayor volumen desembarcado, teniendo en cuenta el esfuerzo pesquero, fueron primavera y verano, siendo octubre y noviembre los meses de mayor rendimiento para M. schmitti y noviembre y diciembre para S. guggenheim. Los valores más altos de captura por unidad de esfuerzo de angelito ocurrieron en la zona costera frente a Rocha, mientras que los de gatuzo ocurrieron frente a la costa de Canelones y Maldonado fuera del RP. Los mayores rendimientos para la raya lisa ocurrieron en el área oceánica al este de Punta del Este. La presencia en los partes de pesca de la categoría “Varios”, el gran número de lances negativos (alta ausencia) de Condrictios, así como la cuantificación de algunas especies en “piezas” y no en peso, demostraron que la captura de las diferentes especies de Condrictios está subestimada. Es esencial una mejora en la calidad de los datos de captura retenida y también descartada de las diferentes especies del grupo Condrictios para evaluar el estado de los stocks de este grupo de peces en el área de estudio.
    Description: Published
    Description: Refereed
    Keywords: Chondrichthyans ; ASFA_2015::T::Trawling
    Repository Name: AquaDocs
    Type: Report
    Format: 24pp.
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  • 3
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    Características poblacionales de Diadema antillarum (Philippi, 1845) (Echinoidea: Diadematidae) en arrecifes de la región noroccidental Cuba. (2024)
    Details
    Publication Date: 2024-07-01
    Description: Diadema antillarum es considerada como el principal invertebrado herbívoro de los arre- cifes de coral del Caribe. Debido a la significación que representa esta especie, en esta investigación se evaluaron indicadores poblacionales de la misma en las crestas arrecifales de playa Baracoa y Rincón de Guanabo, costa noroccidental de Cuba. Los muestreos se realizaron en enero-marzo de 2021. Se estimó la densidad media, diámetro medio de la testa, porcentaje de juveniles y adultos, de agregaciones y albinismo de D. antillarum para cada cresta. Las variables fueron evaluadas utilizando un transecto de banda de 10 m de largo por 1 m de ancho. La densidad media de D. antillarum en playa Baracoa (19.28 ± 14.40 ind./10 m2) fue superior al valor reportado en Rincón de Guanabo (0.78 ± 0.43 ind./10 m2) y en algunos arrecifes del Caribe. En playa Baracoa el porcentaje de indivi- duos adultos representa el 95.25 % del total. El diámetro medio de D. antillarum en playa Baracoa (5.53 ± 1.76 cm) y Rincón de Guanabo (3.05 ± 1.56 cm) resultó ser inferior al reportado en algunos arrecifes del Caribe. En playa Baracoa se encontraron 148 agrega- ciones y 40 individuos albinos. El número bajo de individuos en el Rincón de Guanabo (47) ha generado varias hipótesis que necesitaran ser corroboradas en el futuro. No se en- contró evidencia de la pandemia que sufre D. antillarum en el Caribe, lo cual se considera un indicador positivo. Se recomienda evaluar el manejo (restauración) de la especie en la cresta del Rincón de Guanabo.
    Description: Diadema antillarum is considered the main herbivorous invertebrate of Caribbean co- ral reefs. Due to the significance of this specie for coral reefs, our research focused on evaluating ecological indicators of D. antillarum in the reef crests of Baracoa beach and Rincón de Guanabo on the northwestern coast of Cuba. The study was conducted between January and March of 2021. We assessed the mean density, test mean diameter, percentage of juveniles and adults, aggregations, and instances of albinism in D. anti- llarum for each crest. These variables were measured using a 10-m-long and 1-m-wide belt transect. The mean density of D. antillarum in Baracoa beach (19.28 ± 14.40 ind./10 m2) was higher than that in Rincón de Guanabo (0.78 ± 0.43 ind./10 m2) and other Caribbean reefs. In Baracoa beach, adults accounted 95.25 % of the total individuals found in this crest. The mean diameter of D. antillarum in Baracoa beach (5.53 ± 1.76 cm) and Rincón de Guanabo (3.05 ± 1.56 cm) was lower than that observed in other Caribbean reefs. In Baracoa beach, we identified 148 aggregations and 40 individuals with albinism. The low number (47) of D. antillarum individuals in Rincón de Guanabo generates new hypothesis that have to be tested in the future. No evi- dence of the pandemic affecting D. antillarum in the Ca- ribbean was found, which is considered a positive indicator. It is recommended to evaluate management (restoration) for the species in the Rincón de Guanabo crest.
    Description: Published
    Description: Refereed
    Keywords: Albinismo ; Conducta ; Crestas de arrecifes ; Erizo negro de espinas largas ; Herbivoría ; Albinism ; Behaviour ; Reef´s crests ; Black sea urchin with long spines ; Herbivory
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.115-140
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  • 4
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    Marine habitat mapping. (2024)
    European Marine Board | Ostend, Belgium
    Details
    Publication Date: 2024-07-01
    Description: EMB Future Science Brief No. 11 ‘Marine habitat mapping’ presents science and policy needs and recommendations to advance next-generation marine habitat mapping. This document highlights current methods and future trends in the acquisition of data from the seabed and water column via remote sensing and direct, in situ techniques. It discusses combining data to produce maps using modelling approaches and presents recommendations for adopting fit-for-purpose habitat classification schemes. It also provides an overview of what has been mapped and where within the European sea-basins, highlights the need to increase the quality and resolution of marine habitat maps. It identifies critical gaps in habitat types and geographic extent, including the coastal areas, the deep sea, Natura 2000 sites and other Marine Protected Areas across all regional seas. Finally, it describes the need to improve the assessment and communication of uncertainty and confidence in maps, and to make maps more easily accessible to a variety of stakeholders to increase their value for end-users and to the public for Ocean literacy.
    Description: Published
    Description: Refereed
    Keywords: marine habitat mapping ; conservation ; restoration
    Repository Name: AquaDocs
    Type: Report
    Format: 74pp.
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  • 5
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    La investigación marina en Colombia una actividad de prioridad nacional (2024)
    Details
    Publication Date: 2024-07-01
    Description: Las aguas marinas cubren el 70 % de la tierra. Encierran riquezas animales, vegetales y minerales, cuyo valor real es aún incalculable. Sus aguas poseen una riqueza de compuestos orgánicos e inorgánicos, comparable o superior a la de la tierra. La riqueza pesquera, fuente de proteína animal, ha sido explotada con un fin comercial exclusivamente, sin mayores bases científicas acerca de la biología y ecología de las especies, lo que se ha constituido en una sobreexplotación, que ya ha hecho disminuir y casi desaparecer a varios de sus representantes. Los peces, lo mismo que muchos invertebrados / marinos, son explotados a menudo por monopolios nacionales e internacionales, utilizando la mayoría de las veces, técnicas muy destructivas, pues en muchas ocasiones sólo el 20 ó 30 % de los arrastres son aprovechados. Es decir, sólo los mejores ejemplares son aceptados por los mercados internacionales, y el resto, que bien pudiera ser utilizado en su alimentación por miles de personas, es arrojado de nuevo al mar, como residuo inservible.
    Description: Published
    Description: Refereed
    Keywords: Investigación Marina y Costera ; ASFA_2015::M::Marine fish
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: 1-6 pp
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  • 6
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    Bacterias luminiscentes marinas: el fenómeno de emisión de luz y su aplicación biotecnológica (2024)
    Details
    Publication Date: 2024-07-01
    Description: La bioluminiscencia se refiere a la luz producida por organismos vivos, entre los que se encuentran algunas especies de bacterias de origen marino. El mecanismo de luminiscencia bacteriano está dado por una reacción bioquímica en la que participan la luciferina, el oxígeno, la enzima luciferasa y el ATP, para dar como resultado la emisión de luz y la formación de agua. La expresión de los genes Lux que codifican la maquinaria enzimática está regulada para algunas especies por el quorum sensing, fenómeno que posibilita que la emisión de luz solo ocurra cuando existe una alta densidad celular. Los contaminantes químicos y biológicos, así como algunos factores físicos del ambiente, pueden afectar la emisión de luminiscencia. Dada su sensibilidad a las condiciones ambientales y baja toxicidad, las bacterias luminiscentes han sido empleadas en una amplia variedad de campos, incluyendo los análisis de expresión de genes, descubrimiento de medicamentos, estudios de la dinámica de las proteínas, mapeo de las vías de transducción de señales y monitoreo ambiental. El objetivo de esta revisión es presentar el estado de las investigaciones sobre el fenómeno de la bioluminiscencia, con especial atención en las bacterias marinas luminiscentes y su posible aplicación en el campo de la biotecnología y el monitoreo ambiental.
    Description: Bioluminescence refers to light produced by living organisms, including some species of bacteria of marine origin. The mechanism of bacterial luminescence is given by a biochemical reaction in which luciferin, oxygen, the enzyme luciferase and ATP participate, to result in the emission of light and the formation of water. The expression of the Lux genes that encode the enzymatic machinery is regulated for some species by quorum sensing, a phenomenon that allows light emission to only occur when there is a high cell density. Chemical and biological contaminants, as well as some physical factors in theenvironment can affect the luminescence emission. Given their sensitivity to environmental conditions and low toxicity, luminescent bacteria have been employed in a wide variety of fields, including gene expression analyses, drug discovery, studies of protein dynamics, mapping of signal transduction pathways and environmental monitoring. The objective of this review is to present the state of research on the phenomenon of bioluminescence, with a special focus on luminescent marine bacteria and their potential application in the field of biotechnology and environmental monitoring.
    Description: Published
    Description: Refereed
    Keywords: Bioluminiscencia ; Luciferasa ; Bioensayos ; Aplicaciones ; Bacterias luminiscentes ; Bioluminescence ; Luciferase ; Bioassays ; Applications ; Luminescent bacteria
    Repository Name: AquaDocs
    Type: Journal Contribution
    Format: pp.166-179
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  • 7
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    Fostering Capacity Sharing in Permafrost Research Processes: Learnings from the APECS and Arctic PASSION’s Sharing Circle (2024)
    In:  EPIC3
    Details
    Publication Date: 2024-07-01
    Description: Arctic research is moving towards being application-oriented to address the needs of those directly facing the impacts of accelerating change across permafrost landscapes. Capacity sharing is a two-way knowledge exchange process developed from a basis of reciprocity, communication and collaboration. Multi-directional knowledge exchange can exist in a variety of contexts including intercultural collaboration and the science-policy interface. The Sharing Circle, a workshop organized by the Association of Polar Early Career Scientists (APECS) and the EU Horizon 2020 Arctic PASSION Project, took place in Sevettijärvi and Inari, Sápmi (northern Finland) in early October 2023. The event brought together Arctic youth and early career researchers (ECRs), with in total 18 participants. Hosted in the Skolt Sámi community, the event created a space that facilitated cross-cultural learning between each other and experienced collaborators (Indigenous and non-Indigenous) who have together co-created environmental monitoring and restoration projects. The week was filled with a diverse range of activities including seminars circled around a wood fire and on the land learning activities. The program included both environmental and societal topics, contributing to the transdisciplinary nature of the event. Discussions and activities were centred around topics including: (1) a holistic understanding of the socio-ecological impacts of permafrost thaw (2) challenges and opportunities associated with fostering intercultural collaboration and (3) translating science into policy change. Permafrost warming, a pressing challenge across the circumpolar Arctic (Biskaborn et al., 2019), and its associated impacts on environment and society was discussed heavily. This topic was introduced on an outdoor excursion to a palsa mire in Neiden, northern Norway. Participant-led presentations discussed the potential for co-created community-based monitoring approaches and challenges associated through the presentation of case studies from Tuktoyaktuk, Inuvialuit Settlement Region, Canada (Mercer et al., 2023a, 2023b). The concept of co-management was presented by the Snowchange Cooperative (see at http://www.snowchange.org/). Due to high land-use pressure and climate change impacts, environmental degradation is evident in Sápmi. Long-term cross-cultural collaboration that addresses local priorities has led to successful management and restoration practices at regional scales. Learnings from Snowchange highlighted the need to weave together diverse knowledge systems to better preserve and restore biodiversity (Mustonen, 2021; Ogar et al., 2020). As permafrost scientists, we carry a responsibility to acknowledge the land and empower Indigenous-led research. Doing so can produce greater equity in research outcomes and contribute to a better understanding of the multifaceted impacts of rapid change across permafrost landscapes. Capacity sharing processes help to build long-term and co-created research projects. Therefore, providing opportunities for ECRs to attend events like the Sharing Circle are crucial to creating a step-change in the way research is conducted in the Arctic.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
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  • 8
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    Organic Carbon Characteristics and Dynamics in Thermokarst Terrain on the Alaskan North Slope (2024)
    In:  EPIC3
    Details
    Publication Date: 2024-07-01
    Description: Thermokarst processes have been accelerating since the 1950s in the Alaskan tundra (Chen et al., 2021; Jorgenson et al., 2006) which corresponds to warming permafrost temperatures (Biskaborn et al., 2019) and a disproportional warming climate of the Arctic region (Rantanen et al., 2022). On the Alaskan North Slope, thermokarst is steering the dynamics of thermokarst lakes and drained lake basins (DLBs; Jones et al., 2022), thereby thawing, mobilizing, and sequestering organic carbon. The consequences for the biogeochemical system, which holds significant amounts of organic carbon (Palmtag et al., 2022), remain understudied. In particular, the quality of organic carbon is an important factor for the mobilization potential and rates of release as greenhouse gases (Jongejans et al., 2021). In our study, we aim to investigate the soil organic carbon pool characteristics in a thermokarst terrain close to Utqiaġvik, Alaska.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , NonPeerReviewed
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  • 9
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    Utilization of Crowdsourced Felt Reports to Distinguish High-Impact from Low-Impact Earthquakes Globally within Minutes of an Event (2023)
    In:  The Seismic Record
    Details
    Publication Date: 2024-07-01
    Description: Rapid assessment of an earthquake’s impact on the affected society is a crucial step in the early phase of disaster management, navigating the need for further emergency response measures. We demonstrate that felt reports collected via the LastQuake service of the European Mediterranean Seismological Center can be utilized to rapidly estimate the probability of a felt earthquake being high impact rather than low impact on a global scale. Our data-driven, transparent, and reproducible method utilizing Bayes’ theorem and kernel density estimation provides results within 10 min for 393 felt events in 2021. Although a separation of high- and low-impact events remains challenging, the cor- rect and unambiguous assessment of a large portion of low-impact events is a key strength of our approach. We consider our method as an inexpensive addition to the pool of earthquake impact assessment tools, one that is fully independent of seismic data and can be utilized in many populated areas on the planet. Although practical deployment of our method remains an open task, we demonstrate the potential to improve disaster management in regions that currently lack expensive seismic instrumentation.
    Type: info:eu-repo/semantics/article
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  • 10
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    ICBM—Integrated Combined Baseline Modification: An Algorithm for Segmented Baseline Estimation (2020)
    In:  Seismological Research Letters
    Details
    Publication Date: 2024-07-01
    Description: Accelerograms are the primary source for characterizing strong ground motion. It is therefore of paramount interest to have high‐quality recordings free from any nonphysical contamination. Frequently, accelerograms are affected by baseline jumps and drifts, either related to the instrument and/or a major earthquake. In this work, I propose a correction method for these undesired baseline drifts based on segmented linear least squares. The algorithm operates on the integrated waveforms and combines all three instrument components to estimate a model that modifies the baseline to be at zero continuously. The procedure consists of two steps: first a suite of models with variable numbers of discontinuities is derived for all three instrument components. During this process, the number of discontinuities is reduced in a parsimonious way, for example, two very close discontinuities are merged into a single one. In the second step, the optimal model is selected on the basis of the Bayesian information criterion. I exemplify the application on synthetic waveforms with known discontinuities and on observed waveforms from a unified strong‐motion database of the Japan Meteorological Agency (JMA) and the National Research Institute for Earth Science and Disaster Prevention (NIED, Japan) networks for the major events of the 2016 Kumamoto earthquakes. After the baseline jump correction, the waveforms are furthermore corrected for displacement according to Wang et al. (2011). The resulting displacements are comparable to the Interferometric Synthetic Aperture Radar‐derived displacement estimates for the Kumamoto earthquake sequence.
    Type: info:eu-repo/semantics/article
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