Article
Environmental Sciences
Milene Alexandra Guerreiro, Filipe Martinho, Joana Baptista, Filipe Costa, Miguel Angelo Pardal, Ana Ligia Primo
Summary: The study found seasonal variations in larval and juvenile fish communities in the Mondego estuary and its adjacent coastal area, influenced by environmental factors like temperature. Juvenile recruitment patterns for different species suggest a different nursery function between the estuary and coastal area for early life stages.
MARINE ENVIRONMENTAL RESEARCH
(2021)
Article
Environmental Sciences
Macarena Diaz-Astudillo, Ramiro Riquelme-Bugueno, Kim S. Bernard, Gonzalo S. Saldias, Reinaldo Rivera, Jaime Letelier
Summary: This study analyzed the population dynamics of krill in the Humboldt Current System and found that factors such as temperature, oxygen levels, and upwelling have significant impacts on krill abundance. Additionally, the distribution and biomass of the Peruvian anchovy are also found to interact with the abundance of Humboldt krill. The research results reveal the potential effects of climate change and extreme events on the distribution and trophic interactions of krill in this system.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Biology
Ryan K. Logan, Jeremy J. Vaudo, Bradley M. Wetherbee, Mahmood S. Shivji
Summary: Niche partitioning among three closely related pelagic predators in the vertically compressed Eastern Tropical Pacific (ETP) was studied using recreational fisheries data, satellite tracking, and stable isotope analysis. Although there was high spatial and temporal overlap among the species, diving behavior resulted in spatial partitioning and low trophic overlap. Expanding oxygen minimum zones may increase interspecific competition and limit available vertical habitats for predator guilds.
PROCEEDINGS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
(2023)
Review
Fisheries
Adriana Gonzalez-Pestana, Joanna Alfaro-Shigueto, Jeffrey C. Mangel
Summary: This study reviews the predator-prey relationships within the Northern Humboldt Current System off Peru, focusing on the diet of species that prey on anchoveta, jumbo squid, squat lobster, and mesopelagic fish. The results indicate the conservation status of these predators and highlight the need to incorporate recent diet studies into ecological models. The impact of environmental factors, such as ENSO, on these interactions is also discussed.
FISHERIES RESEARCH
(2022)
Article
Geochemistry & Geophysics
Frederik Gaeng, Philipp Boening, Volker Bruchert, Niko Lahajnar, Katharina Pahnke
Summary: This study investigates the source and accumulation mechanisms of trace elements in sediments of the Namibian shelf and continental shelf anoxic zones. The results show that Zr is a sensitive tracer of dust input and/or sediment reworking, and the combination of Zr, organic matter, and P enrichments can differentiate different sediment environments. Uranium is mainly incorporated into apatite under oscillating oxic to sulfidic conditions, and its use as an indicator of suboxic conditions is questionable. The lithogenic fractions of Ba and Ni are found to be elevated, and their authigenic contents can be calculated to obtain more realistic values. Furthermore, the increase in the authigenic Ni/TOC ratio with sediment depth suggests better preservation and retention of Ni, supporting its use as a productivity indicator for upwelling sediments.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2023)
Article
Marine & Freshwater Biology
Paula M. Ruz-Moreno, Pamela Hidalgo, Marcela Cornejo-D'Ottone, Pamela Fierro-Gonzalez, Javier Babbonney, Kam W. Tang
Summary: Expansion and shallowing of the Oxygen Minimum Zone (OMZ) in coastal upwelling systems can result in dire consequences for ecosystem structure and productivity. A study on the copepod Acartia tonsa collected in northern Chile revealed that hypoxia significantly affected its survival and vital rates.
JOURNAL OF SEA RESEARCH
(2023)
Article
Environmental Sciences
G. V. M. Gupta, R. Jyothibabu, Ch Ramu, A. Yudhistir Reddy, K. K. Balachandran, V Sudheesh, Sanjeev Kumar, N. V. H. K. Chari, Kausar F. Bepari, Prachi H. Marathe, B. Bikram Reddy, Anil Kumar Vijayan
Summary: This study reveals for the first time that the world's largest hypoxic-anoxic zone along the west coast of India is formed through a natural process, with the extent and persistence of coastal oxygen deficiency depending on the degree of deoxygenation of source waters for the upwelling, confined to the central shelf region.
ENVIRONMENTAL RESEARCH LETTERS
(2021)
Article
Environmental Sciences
Praxedes Munoz, Alexis Castillo, Jorge Valdes, Boris Dewitte
Summary: This study investigates the temporal variability of bottom oxygen conditions along the Chilean continental margin in the last 2000 years, revealing a close relationship between the upper part of the OMZ and climatic oscillations. The results show a weakening trend in the upper boundary of the OMZ in recent decades, which is interpreted as a cumulative effect of ventilation processes at different time scales.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Environmental Sciences
Christian Furbo Reeder, Damian L. Arevalo-Martinez, Joan A. Carreres-Calabuig, Tina Sanders, Nicole R. Posth, Carolin Regina Loscher
Summary: This study provides a detailed analysis of diazotrophic diversity in the North BUS OMZ and the Angola tropical zone (ATZ), revealing the presence of various diazotrophs in the OMZ but no active N-2 fixation. The results show regional variations in the role and diversity of diazotrophs in OMZs, which are crucial for understanding the nitrogen cycle in OMZ waters and predicting the future development of OMZ biogeochemistry in a changing ocean.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Anja Engel, Carolina Cisternas-Novoa, Helena Hauss, Rainer Kiko, Frederic A. C. Le Moigne
Summary: This study provides evidence of hypoxia-tolerant zooplankton feeding on sinking particles in the extensive Oxygen Minimum Zone (OMZ) off Peru, and shows significant control of carbon export by these organisms. These findings challenge the assumption of consistently efficient biological carbon pump in OMZs and highlight the importance of considering mesopelagic organisms in studying oceanic carbon sequestration.
COMMUNICATIONS EARTH & ENVIRONMENT
(2023)
Article
Environmental Sciences
Marco Torri, Anna Maria Pappalardo, Venera Ferrito, Salvatore Gianni, Grazia Maria Armeri, Carlo Patti, Francesca Mangiaracina, Girolama Biondo, Marilena Di Natale, Marianna Musco, Tiziana Masullo, Carmelo Bennici, Stefania Russo, Aldo Nicosia, Marcello Tagliavia, Antonio Mazzola, Bernardo Patti, Angela Cuttitta
Summary: Cyclothone braueri is a widely distributed fish species in the mesopelagic zone, with a significant impact on ecological processes. The study revealed geographically distinct morphotypes of C. braueri related to different nutritional conditions, with body depth emerging as an appropriate morphometric parameter for detecting larval condition. Molecular analysis showed moderate genetic divergence in the fish population, with recurring phylogroups not geographically separated.
MARINE ENVIRONMENTAL RESEARCH
(2021)
Article
Ecology
Alexis Castillo, Tatiana Hromic, Roberto A. Uribe, Jorge Valdes, Abdel Sifeddine, Lyta Quezada, Sue-Ellen Vega, Ariel Arencibia, Javier Diaz-Ochoa, Marcos Guinez
Summary: This study assesses the influence of organic matter and subsurface oxygenation on living calcareous benthic foraminifera in a coastal upwelling ecosystem off Inglesa Bay, Northern Chile. The results show that local environmental conditions govern the structure and composition of these foraminifera assemblages. Three distinct foraminiferal associations were identified, each strongly linked to nutritive organic matter and subsurface oxygenation.
REGIONAL STUDIES IN MARINE SCIENCE
(2021)
Article
Oceanography
Shawn Dove, Maik Tiedemann, Heino Ove Fock
Summary: This study provides a comprehensive view of larval fish species distributions in the eastern Central and North Atlantic, identifying five assemblages and four groups of species based on hydrographic parameters. Tropical species prefer high sea surface temperatures, while Temperate species are associated with high chlorophyll-a concentrations.
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
(2021)
Article
Microbiology
Aurele Vuillemin
Summary: Productive oxygen minimum zones are regions dominated by heterotrophic denitrification fueled by sinking organic matter, which result in the loss and overall geochemical deficit in inorganic fixed nitrogen in the water column, thereby impacting global climate in terms of nutrient equilibrium and greenhouse gases.
FRONTIERS IN MICROBIOLOGY
(2023)
Article
Multidisciplinary Sciences
Cristian A. Vargas, Sebastian I. Cantarero, Julio Sepulveda, Alexander Galan, Ricardo De Pol-Holz, Brett Walker, Wolfgang Schneider, Laura Farias, Marcela Cornejo D'Ottone, Jennifer Walker, Xiaomei Xu, Joe Salisbury
Summary: Geochemical and stable isotope measurements in the anoxic marine zone off northern Chile show that microbial processes mediating sulfur and nitrogen cycling significantly impact the carbonate chemistry. In 2015, sulfur-driven autotrophic denitrification dominated, while in 2018, heterotrophic processes were prevalent. Variations in sulfur- and nitrogen-mediated carbon fixation rates in the AMZ waters contribute significantly to POC exported to deeper waters.
NATURE COMMUNICATIONS
(2021)
Article
Marine & Freshwater Biology
Everton Giachini Tosetto, Barbara Barkokebas Silva, Xiomara Franchesca Garcia Diaz, Sigrid Neumann-Leitao, Arnaud Bertrand
Summary: The structure of thaliacean community in western boundary current system is influenced by the circulation and thermohaline features. Pyrosoma atlanticum is highly abundant over the continental slope under the influence of the strong North Brazilian Undercurrent, while Doliolida spp. dominate offshore under the influence of the central branch of South Equatorial Current.
Article
Environmental Sciences
Alejandro Ariza, Matthieu Lengaigne, Christophe Menkes, Anne Lebourges-Dhaussy, Aurore Receveur, Thomas Gorgues, Jeremie Habasque, Mariano Gutierrez, Olivier Maury, Arnaud Bertrand
Summary: The study found that global marine organisms will be seriously compromised by the end of the 21st century if the current greenhouse gas emission scenario continues. Low and mid latitudes are expected to lose animal biomass, while higher latitudes will have existing temperate fauna, consistent with results from ecosystem simulations.
NATURE CLIMATE CHANGE
(2022)
Article
Environmental Sciences
Alina N. Dossa, Alex Costa da Silva, Fabrice Hernandez, Habib M. A. Aguedjou, Alexis Chaigneau, Moacyr Araujo, Arnaud Bertrand
Summary: The southwestern tropical Atlantic is a region with complex ocean dynamics that favor the formation and development of mesoscale eddies. The study reveals that there is a significant variation in the characteristics and formation mechanisms of eddies in the region. The majority of mesoscale eddies are generated within the region, with specific seasons and environmental conditions playing a role in their formation and propagation.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Environmental Sciences
Leandro Nole Eduardo, Arnaud Bertrand, Flavia Lucena-Fredou, Barbara Teixeira Villarins, Julia Rodrigues Martins, Gabriel Vinicius Felix Afonso, Theodore Wells Pietsch, Thierry Fredou, Fabio Di Dario, Michael Maia Mincarone
Summary: This study provides the first comprehensive research on the biodiversity of mesopelagic fishes in the southwestern Tropical Atlantic. The research includes a complete list of fish species in the region and important aspects of different groups. The findings reveal the existence of at least 200 species, including potentially new species and new records. The study also highlights the depth distribution patterns of mesopelagic fishes, with deep-sea species dominating during the day and more species migrating to shallower depths at night.
FRONTIERS IN MARINE SCIENCE
(2022)
Article
Meteorology & Atmospheric Sciences
Limbert Torrez-Rodriguez, Katerina Goubanova, Cristian Munoz, Aldo Montecinos
Summary: In this study, an ensemble of three Regional Climate Models (RCMs) was evaluated to assess their skills and limitations in reproducing the near-surface temperature and precipitation over the complex terrain of Subtropical Chile. The simulations showed reasonable agreement with observed spatio-temporal characteristics, but exhibited a prominent cold bias at high elevations. The results highlight the importance of improving the density and quality of observational networks for an accurate assessment and calibration of RCMs.
Article
Fisheries
Josafa Reis-Junior, Arnaud Bertrand, Thierry Fredou, Jonas Vasconcelos, Katia C. Aparecido, Paulo J. Duarte-Neto
Summary: Functional morphology investigates the relationships between morphological characters and external factors, such as environmental, physical and ecological features. In this study, geometric morphometrics techniques were used to assess the functional relationships between body shape and trophic ecology of a tropical demersal marine fish community. The results showed that shape variables can partially explain fish trophic level, with body elongation and size being important factors. These findings have important implications for understanding fish functional characteristics, particularly in trophic ecology.
JOURNAL OF FISH BIOLOGY
(2023)
Article
Environmental Sciences
Leandro Nole Eduardo, Flavia Lucena-Fredou, Sophie Lanco Bertrand, Alex Souza Lira, Michael Maia Mincarone, Guilherme Tavares Nunes, Thierry Fredou, Andrey Soares, Francois Le Loc'h, Latifa Pelage, Ralf Schwamborn, Paulo Travassos, Karla Martins, Simone M. A. Lira, Gabriela A. A. Figueiredo, Teodoro Vaske Junior, Frederic Menard, Arnaud Bertrand
Summary: This study evaluates the trophic linkage between epipelagic and mesopelagic ecosystems and finds a significant trophic difference between the two layers. It also shows that deep-sea species have a higher trophic specialization. The study also discusses the impacts of human activities on these species and their vulnerability in the Anthropocene.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Environmental Sciences
Habib Micael A. Aguedjou, Alexis Chaigneau, Isabelle Dadou, Yves Morel, Ezinvi Baloitcha, Casimir Y. Da-Allada
Summary: This study examines the impact of mesoscale eddies on air-sea heat and fresh water exchange in the tropical Atlantic Ocean using satellite altimetry data, SST, LHF, SHF, IRF and PR data. The findings reveal that approximately 40% of cyclonic eddies contribute to warm SST anomalies, while 40% of anticyclonic eddies contribute to cold SST anomalies. Eddies play a role in the variability of LHF, SHF, and IRF, with the largest contributions observed in the intertropical convergence zone and frontal SST areas.
Article
Engineering, Marine
Alexis Chaigneau, Francois Talomonwo Ouinsou, Herve Hotekpo Akodogbo, Gauthier Dobigny, Thalasse Tchemangnihode Avocegan, Fridolin Ubald Dossou-Sognon, Victor Olaegbe Okpeitcha, Metogbe Belfrid Djihouessi, Frederic Azemar
Summary: This study investigated the seasonal variation of zooplankton diversity and abundance in the Nokoue Lagoon in southern Benin. The results showed that salinity was the key factor driving the structure of zooplanktonic communities, which exhibited significant seasonal variation. It was found that during the high water period, rotifers were dominant, zooplanktonic diversity was highest, and abundances were quite high, while during the low water period, diversity decreased slightly. The study also revealed the potential influence of other factors such as riverine inputs or the presence of acadjas on the zooplankton community.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Environmental Sciences
Rodrigo Mogollon, Cinthia Arellano, Piero Villegas, Dante Espinoza-Morriberon, Jorge Tam
Summary: This study simulates the spillage of 1460 metric tons of oil off La Pampilla Refinery in central Peru, which resulted in a northward displacement of the oil slick along the coastline. The analysis revealed that evaporation and beaching processes were the main factors responsible for the removal of oil within 96 hours after the spill. The coastal areas from Ventanilla to Punta Chancay experienced significant impacts, with Ventanilla and Santa Rosa Beaches and the National Reserve System of Islands being heavily impacted in the first 24 hours.
MARINE POLLUTION BULLETIN
(2023)
Article
Multidisciplinary Sciences
Ramilla Assuncao, Anne Lebourges-Dhaussy, Alex C. C. da Silva, Gildas Roudaut, Alejandro Ariza, Leandro N. N. Eduardo, Syumara Queiroz, Arnaud Bertrand
Summary: Ocean dynamics play a crucial role in shaping the structure of pelagic ecosystems by driving nutrient income and subsequent trophic interactions. However, fine-scale studies on the biophysical interactions along depth are limited. In this study, we assessed the vertical structure of oceanographic variables and the distribution of acoustic biomass to improve our understanding of these relationships. The results highlight the importance of chlorophyll-a, oxygen, current, and stratification as drivers for the distribution of sound scattering biota, with their relative importance varying depending on the area, depth range, and diel cycle.
Article
Multidisciplinary Sciences
Everton Giachini Tosetto, Sigrid Neumann-Leitao, Moacyr Araujo, Djoirka Minto Dimoune, Arnaud Bertrand, Miodeli Nogueira Jr
Summary: This study investigates the impact of the Amazon River freshwater plume on planktonic cnidarians in the Western Atlantic. The results show that the plume shapes marine habitats, creating a highly productive surface layer compressed by a deeper oxygen minimum zone. Planktonic cnidarian assemblages are diverse and abundant within the plume, while dominant species dominate outside the plume. The Amazon River plume is a crucial physical feature that significantly affects the dynamics of habitat structure in the Western Equatorial Atlantic Ocean.
Review
Oceanography
Cristina Gonzalez-Garcia, Susana Agusti, Jim Aiken, Arnaud Bertrand, Gabriel Bittencourt Farias, Antonio Bode, Claire Carre, Rafael Goncalves-Araujo, Derek S. Harbour, Maria Huete-Ortega, Pedro A. M. C. Melo, Enrique Moreno-Ostos, Andrew P. Rees, Jaime Rodriguez, Sonia da Silva, Mikhail Zubkov, Emilio Maranon
Summary: Phytoplankton size structure, as indicated by the slope of the size-abundance spectrum, plays a vital role in determining trophic structure and functioning in pelagic ecosystems. Previous studies have primarily focused on specific open-ocean or coastal environments, thus neglecting the overall variability in phytoplankton size structure across wide ranges of biomass and productivity. In this study, we provide a comprehensive overview of the basin-scale variability in phytoplankton biomass and size-abundance spectrum slope across the Atlantic Ocean, revealing consistent latitudinal patterns and an inverse relationship between cell size and abundance. These findings have implications for understanding and predicting shifts in phytoplankton size structure in response to climate change.
PROGRESS IN OCEANOGRAPHY
(2023)
Review
Oceanography
Jorge Flores-Valiente, Christophe Lett, Francois Colas, Laure Pecquerie, Arturo Aguirre-Velarde, Fanny Rioual, Jorge Tam, Arnaud Bertrand, Patricia Ayon, Saidou Sall, Nicolas Barrier, Timothee Brochier
Summary: In the northern Humboldt Current system (NHCS), the impact of environment on the early-life stages of Peruvian anchovy remains challenging. Climate variability modulates currents velocity, temperature and food availability, affecting early-life stages drift, growth and survival. To investigate these impacts, an individual-based model including larval retention processes and a Dynamic Energy Budget (DEB) bioenergetic module for larval growth was developed.
PROGRESS IN OCEANOGRAPHY
(2023)
Article
Environmental Studies
L. Pelage, A. Bertrand, S. C. W. Siqueira, A. C. A. P. Araujo, K. V. A. Avelino, C. Lopes da Silva, T. Fredoua
Summary: Global change has a significant impact on small-scale fisheries in Brazil, and acquiring local user knowledge is crucial for enhancing their sustainability. In Rio Formoso, a fisher's association plays a vital role in conserving coastal ecosystems and raising awareness about anthropogenic activities. This study examines fishers' perceptions of global change and highlights the threats and social challenges they face.