Recent dinoflagellate cysts from the Chesapeake estuary (Maryland and Virginia, U.S.A.) : taxonomy and ecological preferences /

Master of Science in Geolog

Geographic distribution of dinoflagellate cysts in surface sediments

Dinoflagellate cysts are useful for reconstructing upper water conditions. For adequate reconstructions detailed information is required about the relationship between modern day environmental conditions and the geographic distribution of cysts in sediments. This Atlas summarises the modern global distribution of 71 organicwalled dinoflagellate cyst species. The synthesis is based on the integration of literature sources together with data of 2405 globally distributed surface sediment samples that have been preparedwith a comparable methodology and taxonomy. The distribution patterns of individual cyst species are being comparedwith environmental factors that are knownto influence dinoflagellate growth, gamete production, encystment, excystment and preservation of their organic-walled cysts: surface water temperature, salinity, nitrate, phosphate, chlorophyll-a concentrations and bottom water oxygen concentrations. Graphs are provided for every species depicting the relationship between seasonal and annual variations of these parameters and the relative abundance of the species. Results have been compared with previously published records; an overview of the ecological significance as well as information about the seasonal production of each individual species is presented. The relationship between the cyst distribution and variation in the aforementioned environmental parameters was analysed by performing a canonical correspondence analysis. All tested variables showed a positive relationship on the 99% confidence level. Sea-surface temperature represents the parameter corresponding to the largest amount of variance within the dataset (40%) followed by nitrate, salinity, phosphate and bottom-water oxygen concentration, which correspond to 34%, 33%, 25% and 24% of the variance, respectively. Characterisations of selected environments as well as a discussion about how these factors could have influenced the final cyst yield in sediments are included

First Assessment of the Impacts of the COVID-19 Pandemic on Global Marine Recreational Fisheries

This work is the result of an international research effort to determine the main impacts of the COVID-19 pandemic on marine recreational fishing. Changes were assessed on (1) access to fishing, derived from lockdowns and other mobility restrictions; (2) ecosystems, because of alterations in fishing intensity and human presence; (3) the blue economy, derived from alterations in the investments and expenses of the fishers; and (4) society, in relation to variations in fishers’ health and well-being. For this, a consultation with experts from 16 countries was carried out, as well as an international online survey aimed at recreational fishers, that included specific questions designed to capture fishers’ heterogeneity in relation to behavior, skills and know-how, and vital involvement. Fishers’ participation in the online survey (5,998 recreational fishers in 15 countries) was promoted through a marketing campaign. The sensitivity of the fishers’ clustering procedure, based on the captured heterogeneity, was evaluated by SIMPER analysis and by generalized linear models. Results from the expert consultation highlighted a worldwide reduction in marine recreational fishing activity. Lower human-driven pressures are expected to generate some benefits for marine ecosystems. However, experts also identified high negative impacts on the blue economy, as well as on fisher health and well-being because of the loss of recreational fishing opportunities. Most (98%) of the fishers who participated in the online survey were identified as advanced, showing a much higher degree of commitment to recreational fishing than basic fishers (2%). Advanced fishers were, in general, more pessimistic about the impacts of COVID-19, reporting higher reductions in physical activity and fish consumption, as well as poorer quality of night rest, foul mood, and raised more concerns about their health status. Controlled and safe access to marine recreational fisheries during pandemics would provide benefits to the health and well-being of people and reduce negative socioeconomic impacts, especially for vulnerable social groups

First Assessment of the Impacts of the COVID-19 Pandemic on Global Marine Recreational Fisheries

This work is the result of an international research effort to determine the main impacts of the COVID-19 pandemic on marine recreational fishing. Changes were assessed on (1) access to fishing, derived from lockdowns and other mobility restrictions; (2) ecosystems, because of alterations in fishing intensity and human presence; (3) the blue economy, derived from alterations in the investments and expenses of the fishers; and (4) society, in relation to variations in fishers? health and well-being. For this, a consultation with experts from 16 countries was carried out, as well as an international online survey aimed at recreational fishers, that included specific questions designed to capture fishers? heterogeneity in relation to behavior, skills and know-how, and vital involvement. Fishers? participation in the online survey (5,998 recreational fishers in 15 countries) was promoted through a marketing campaign. The sensitivity of the fishers? clustering procedure, based on the captured heterogeneity, was evaluated by SIMPER analysis and by generalized linear models. Results from the expert consultation highlighted a worldwide reduction in marine recreational fishing activity. Lower human-driven pressures are expected to generate some benefits for marine ecosystems. However, experts also identified high negative impacts on the blue economy, as well as on fisher health and well-being because of the loss of recreational fishing opportunities. Most (98%) of the fishers who participated in the online survey were identified as advanced, showing a much higher degree of commitment to recreational fishing than basic fishers (2%). Advanced fishers were, in general, more pessimistic about the impacts of COVID-19, reporting higher reductions in physical activity and fish consumption, as well as poorer quality of night rest, foul mood, and raised more concerns about their health status. Controlled and safe access to marine recreational fisheries during pandemics would provide benefits to the health and well-being of people and reduce negative socioeconomic impacts, especially for vulnerable social groups.Fil: Pita, Pablo. Universidad de Santiago de Compostela; EspañaFil: Ainsworth, Gillian B.. Universidad de Santiago de Compostela; EspañaFil: Alba, Bernardino. Alianza de Pesca Española Recreativa Responsable; EspañaFil: Anderson, Antônio B.. Universidade Federal do Espírito Santo; BrasilFil: Antelo, Manel. Universidad de Santiago de Compostela; EspañaFil: Alós, Josep. Consejo Superior de Investigaciones Científicas. Instituto Mediterráneo de Estudios Avanzados; EspañaFil: Artetxe, Iñaki. No especifíca;Fil: Baudrier, Jérôme. Institut Français de Recherche Pour l’Exploitation de la Mer; FranciaFil: Castro, José J.. Universidad de Las Palmas de Gran Canaria; EspañaFil: Chicharro, Belén. No especifíca;Fil: Erzini, Karim. Universidad de Algarve; PortugalFil: Ferter, Keno. No especifíca;Fil: Freitas, Mafalda. No especifíca;Fil: García-de-la-Fuente, Laura. Universidad de Oviedo; EspañaFil: García Charton, José A.. Universidad de Murcia; EspañaFil: Giménez Casalduero, María. Universidad de Murcia; EspañaFil: Grau, Antoni M.. No especifíca;Fil: Diogo, Hugo. Universidade Dos Açores; Portugal. Direção de Serviços de Recursos; PortugalFil: Gordoa, Ana. No especifíca;Fil: Henriques, Filipe. Universidad de Algarve; Portugal. Universidad de Coimbra; PortugalFil: Hyder, Kieran. University of East Anglia; Reino UnidoFil: Jiménez Alvarado, David. Universidad de Las Palmas de Gran Canaria; EspañaFil: Karachle, Paraskevi K.. No especifíca;Fil: Lloret, Josep. Universidad de Girona; EspañaFil: Laporta, Martin. No especifíca;Fil: Lejk, Adam M.. No especifíca;Fil: Dedeu, Arnau L.. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Sosa, Martín Pablo. No especifíca;Fil: Martínez, Lllibori. No especifíca;Fil: Mira, Antoni M.. No especifíca;Fil: Morales Nin, Beatriz. Consejo Superior de Investigaciones Científicas. Instituto Mediterráneo de Estudios Avanzados; EspañaFil: Mugerza, Estanis. No especifíca;Fil: Olesen, Hans J.. Technical University of Denmark; DinamarcaFil: Papadopoulos, Anastasios. No especifíca;Fil: Pontes, João. Universidad de Algarve; PortugalFil: Pascual Fernández, José J.. Universidad de La Laguna; EspañaFil: Purroy, Ariadna. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Ramires, Milena. Santa Cecília University; BrasilFil: Rangel, Mafalda. Universidad de Algarve; PortugalFil: Reis Filho, José Amorim. Universidade Federal do Pará; BrasilFil: Sánchez Lizaso, Jose L.. Universidad de Alicante; EspañaFil: Sandoval, Virginia. Universidad de Murcia; EspañaFil: Sbragaglia, Valerio. Consejo Superior de Investigaciones Científicas. Instituto de Ciencias del Mar; EspañaFil: Silva, Luis. No especifíca;Fil: Skov, Christian. Technical University of Denmark; DinamarcaFil: Sola, Iván Daniel. Universidad de Alicante; España. Universidad de Playa Ancha; ChileFil: Strehlow, Harry V.. No especifíca;Fil: Torres, María A.. No especifíca;Fil: Ustups, Didzis. No especifíca;Fil: van der Hammen, Tessa. No especifíca;Fil: Veiga, Pedro. Universidad de Algarve; PortugalFil: Venerus, Leonardo Ariel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Centro Nacional Patagónico. Centro para el Estudio de Sistemas Marinos; ArgentinaFil: Verleye, Thomas. No especifíca;Fil: Villasante, Sebastián. Universidad de Santiago de Compostela; EspañaFil: Weltersbach, Marc Simon. No especifíca;Fil: Zarauz, Lucía. No especifíca