Article
Environmental Studies
Francesc Maynou
Summary: The study investigated the formation of ex-vessel price of hake and red shrimp in the Catalonia bottom trawl fishery in the NW Mediterranean through an inverse demand approach. It found that the quantity and scale composition of landings have a significant impact on the daily prices fetched at auction. Changes in landing quantities and size structures will affect sale prices differently due to the quantity and scale flexibilities identified in the inverse demand model.
Article
Geography, Physical
Simon Faye, Andre Rochon, Guillaume St-Onge, Isabel Vilanova, Anne de Vernal, Pierre-Arnaud Desiage
Summary: We used pollen and dinocyst assemblages from sedimentary sequences in the San Jorge Gulf to study the vegetation history of the extra-Andean/eastern Patagonia region and the variations in the Southern Westerly Wind Belt (SWWB) during the Late Pleistocene and Holocene. We found that before 14 cal ka BP, the vegetation was dominated by halophytic plants related to arid coastal conditions. After 14 cal ka BP, shrub and herb vegetation developed in the Patagonian steppe under semi-arid conditions. Changes in Nothofagus pollen abundances and marine palynomorphs indicated a transition at 14 cal ka BP, suggesting strong westerlies and sea-level rise. Dinocyst assemblages provided information on changes in summer sea-surface temperature (SST) and annual net primary productivity. The early Holocene was characterized by warmer conditions and high SWWB intensity, while the middle Holocene showed increased heterotrophic taxa and gradual cooling of surface water. After 4 cal ka BP, pollen data indicated a decrease in SWWB intensity, correlated with glacier advances and lower summer SST in the San Jorge Gulf.
QUATERNARY SCIENCE REVIEWS
(2023)
Article
Biodiversity Conservation
Stefanos Kalogirou, Charalampos Dimitriadis, Christos D. Maravelias, Dimitrios Poursanidis, Mihalis Margaritis, Helen Miliou, Leif Pihl
Summary: Small-scale fisheries in the Mediterranean and Black seas have a significant impact on the social and economic aspects, but also affect the bycatch species. The study on catch dynamics and the number of bycatch species can provide insights into more sustainable management measures.
Article
Geosciences, Multidisciplinary
N. Sanchez-Carnero, D. Rodriguez-Perez
Summary: The study discusses the factors influencing benthic habitats and the research methods used, emphasizing the importance of multibeam echosounders in providing data for seabed classification. The data acquired in the Robredo area reveals the substrate characteristics and bottom structure complexity, leading to important insights into the benthic geohabitats. The results show that Robredo has two subareas with different substrate types, indicating the significance of bottom structure complexity in seabed classification.
GEO-MARINE LETTERS
(2021)
Article
Fisheries
Kyle W. Shertzer, Erik H. Williams, Skyler R. Sagarese
Summary: To achieve accurate stock assessments, it is important to consider discard mortality in fisheries. There are three common approaches to modeling discards in assessments: lumping them with landings, treating them as their own fleet, or linking them with landings through a retention function. Simulation studies and a case study of red grouper in the U.S. Gulf of Mexico show that modeling discards explicitly can lead to different outcomes and have implications for management advice.
Article
Fisheries
Christopher D. Stallings, Oscar Ayala, Tiffanie A. Cross, Beverly Sauls
Summary: Fish that are caught but then released, either due to fishing regulations or catch-and-release efforts, are at risk of dying, especially for species that are affected by barotrauma when brought up from deep waters. To minimize the effects of barotrauma, venting tools are commonly used to release trapped air and allow fish to return to their original depth. Another method being promoted is recompression, where fish are rapidly descended to their capture depth or a depth where they can swim on their own. This study examined the survival rates of red snapper and red grouper after being released using venting or recompression methods, and found that recompression to deeper depths resulted in higher tag return rates, indicating lower discard mortality.
FISHERIES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Marcos E. Bahia, L. Mariana Longo, Claudia L. Ravazzoli, Nicolas Scivetti, Leonardo Benedini, Paulo Marcos, Daniel A. Gregori
Summary: This study analyzed the subsurface structure of the San Jorge Gulf basin in Argentina using gravimetric data integrated with geological information, revealing gravity lows and highs in the western flank and basement horst-like structures. The 3D gravity model showed the geometry of the basin's eastern sector and indicated that the gravimetric method could be a fast, economic, robust, and reliable exploration method for the area. Additionally, the method proved useful for detecting potential structures of interest that had not been identified previously.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Zoology
Nicolas Cetra, Andera Roche
Summary: This article introduces the San Matias gulf in Argentinean Patagonia as a marine biodiversity hotspot and focuses on the study of nudibranchs. The research identifies 15 species of nudibranchs, including two new family records for Argentina: Coryphellidae and Dotidae. Additionally, the study expands the known geographic range of five species and records the presence of warm water species such as Doto uva and Coryphella cf. verta in the area. The distribution range of Rostanga pulchra and Diaulula hispida also extends to the north of Argentine Patagonia.
Article
Environmental Studies
Yessine Ben Arfa, Antonio Di Cintio, Luca Ceriola, Othmen Jarboui
Summary: The paper summarizes a three-year socio-economic study on the bottom trawl fleet in North Tunisia targeting deep water rose shrimp and European hake. The study found that the fishery's profitability and fragility are highlighted, with a strong reliance on international market demand. The indicators related to demographics and employment suggest a well-performing fishery, but with room for improvement. Factors such as the number of employed fishers, age of the fishing fleet, and number of fishing units accessing the fisheries characterize the fishery and pose challenges to its stability and further development.
Article
Chemistry, Applied
Carolina Pascual-Silva, Ailen Aleman, M. Pilar Montero, M. Carmen Gomez-Guillen
Summary: Phospholipids rich in omega-3 fatty acids from Argentine red shrimp waste were used to produce food-grade liposomes. The phospholipid fraction presented high stability and mainly consisted of phosphatidylcholine (PC) with a combination of different fatty acids. The resulting liposomes were approximately 140 nm in size, with high stability for 28 days at 4 degrees Celsius.
Article
Geography, Physical
Pierre-Arnaud Desiage, Guillaume St-Onge, Mathieu J. J. Duchesne, Jean-Carlos Montero-Serrano, Miguel J. J. Haller
Summary: This study provides a detailed description of the upper sedimentary succession in the Gulf of San Jorge, based on high-resolution seismic profiles and sediment cores. It confirms the existence of a paleo-fluvial network buried by estuarine deposits during marine transgression. The analysis suggests a rapid sea-level rise consistent with Meltwater Pulse 1A, highlighting the significant impact of sea-level rise on sedimentation in the gulf.
JOURNAL OF QUATERNARY SCIENCE
(2023)
Article
Geosciences, Multidisciplinary
V. S. Perez Loinaze, S. R. Giordano, C. O. Limarino
Summary: A lithofacial and palynological study was conducted on the Can?ad?on Seco Formation in the La Frieda Oeste x-1 well in the Golfo San Jorge Basin, revealing four main lithofacies and suggesting a Turonian?Coniacian age based on the palynological assemblage. The study indicates temperate to warm and humid conditions during a little known period in the evolution of angiosperms in the southern region of Gondwana.
JOURNAL OF SOUTH AMERICAN EARTH SCIENCES
(2021)
Article
Fisheries
Cheng-Han Tsai, Stephan B. Munch, Michelle D. Masi, Adam G. Pollack
Summary: The empirical dynamic modeling (EDM) approach, which compensates for unobserved interactions by using time delays of observed states, can improve the predictions for short-lived penaeid shrimp species. The abundance dynamics of these shrimp species were well-predicted by EDM, showed spatial similarity across the US Gulf of Mexico, and were characterized by nonlinear density-dependent interaction and temperature variability.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2023)
Article
Environmental Sciences
O. Magali Olmedo-Masat, Juan Pablo Pisoni, Daniel Rodriguez-Perez, Noela Sanchez-Carnero
Summary: In this study, we focused on persistent coastal oceanographic structures in the marine protected area of Patagonia Austral. Using satellite imagery from 80 Landsat-8 images, we identified over 20 structures that consistently appear in the same areas. Tidal currents were found to be the most significant factor in the formation and evolution of these structures.
Article
Biotechnology & Applied Microbiology
Diana Paula Quezada, Maria Lujan Flores, Osvaldo Leon Cordoba
Summary: The alga Undaria pinnatifida from Golfo San Jorge region was studied for its chemical profile and biological activity. The results showed it synthesized various bioactive metabolites, with differences according to the season. The alga exhibited potential as a source of bioactive molecules, and seasonal studies were important for determining the best collection season based on the metabolites to be studied.
JOURNAL OF APPLIED PHYCOLOGY
(2023)
