Marine Protected Areas (MPAs) require efficient monitoring tools to assess habitats and biodiversity, particularly in remote or understudied regions. This study demonstrates the utility of towed video-diver technique combined with high-resolution video for rapidly surveying benthic associated taxa. Applied Arredondo, a shallow bay within an MPA Atlantic Patagonia, method covered 14,000 m2 through eight transects, utilizing just 180 min dive time ~300 analysis. Substrate types their taxa were...

Artificial reefs are submerged human-made objects. In particular, the artificial wrecks intentionally obsolete ships. Once deployed, these rapidly colonized by diverse benthic communities. Currently, this effect is positively valued recreational diving industry, which uses colonization as one of main arguments to promote deployment wrecks. However, there increasing evidence that not a substitute for natural and may alter complex ecological processes such food web structure increase...

Abstract Globally, sharks are impacted by a wide range of human activities, resulting in many populations being depleted. Trophy large-sized the Argentinean coast, sand-tiger Carcharias taurus , copper Carcharhinus brachyurus and sevengill shark Notorynchus cepedianus under intense sport artisanal fishing since 50's decade. However, current historical information for assessment its status is scarce. The aim this work was to analyze conservation these species through gathering expert...

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 603:147-160 (2018) - DOI: https://doi.org/10.3354/meps12715 Habitat use, seasonality and demography of an apex predator: sevengill shark Notorynchus cepedianus in northern Patagonia Alejo J. Irigoyen1,*, Agustín M. De Wysiecki1, Gastón Trobbiani1, Nelson Bovcon2, Cynthia A. Awruch1,3, Federico Argemi4, Andrés...

Underwater visual census (UVC) is the most common approach for estimating diversity, abundance and size of reef fishes in shallow clear waters. Abundance estimation through UVC particularly problematic species occurring at low densities and/or highly aggregated because their high variability both spatial temporal scales. The statistical power experiments involving techniques may be increased by augmenting number replicates or area surveyed. In this work we present test efficiency an method...

In the last years, technological advances enhanced utilization of baited underwater video (BUV) to monitor diversity, abundance, and size composition fish assemblages. However, attempts use static single-camera devices estimate length were limited due high errors, originated from variable distance between fishes reference scale included in scene. this work, we present a novel simple method obtain accurate estimates carnivorous by using single downward-facing camera station. The distinctive...

Essential habitats support specific functions for species, such as reproduction, feeding or refuge. For highly mobile aquatic identifying essential within the wider distribution range is central to understanding species ecology, and underpinning effective management plans. This study examined movement space use patterns of sevengill sharks ( Notorynchus cepedianus ) in Caleta Valdés (CV), a unique coastal habitat northern Patagonia, Argentina. Seasonal residency were evident, with higher...

Abstract The amount of energy an animal uses to move may constitute a significant fraction its budget, so detailed descriptions wild activity budgets can help understand the ecology species, both at individual and population levels. rocky‐reef fishes inhabiting northern Patagonian gulfs Argentina are important economic recreational resources for which no or available. This fish assemblage reach high aggregated biomasses (exceeding several hundreds kilogrammes distributed along few hundred...

Abstract The habitat use, seasonality and demography of the broadnose sevengill shark Notorynchus cepedianus were investigated in central Patagonia, where a data gap exists for species. Catch effort video‐derived indices indicated high relative abundance sharks during warm months. Video stations revealed differences spatial use by sharks, being more frequently observed inner section bay. Complementary tagging efforts evidenced both seasonal residence pattern site fidelity between consecutive...

Studies of benthic abundance and biodiversity are essential for fisheries management environmental impact assessments. In the case commercial species, such as Tehuelche scallop (Aequipecten tehuelchus), accurate information on stocks their densities is crucial. The standard survey method used to estimate scallops in San José Gulf, Argentina Patagonia, based visual counts obtained by divers labor-intensive limited diving depths. This study introduces a light low-cost video remote system,...

Abstract This study addresses the challenge of advancing habitat use knowledge widely distributed marine species populations when regional data is scarce. To achieve this, we an innovative approach based on ecological niche models (ENMs) calibrated with global presence to estimate species, allowing for indirect predictions suitable habitats and potential distribution in one or more regions interest. The method leverages a range occurrence records, including scientific papers, government...

Knowing the movement patterns of a certain species has substantial implications for its management and conservation, particularly in that migrate hundreds to thousands kilometers each year (e.g., many chondrichtyans). The objective this paper was study seasonal abundance Golfo Nuevo migratory school sevengill shark across Argentine shelf through conventional capture-recapture plan. A total 13 228 sharks were tagged during full annual cycle. From analysis catch per unit effort we found...

ABSTRACT Knowledge of the spatial and temporal distribution patterns chondrichthyans is critical for their effective management. In this study we report analyze a large-scale latitudinal migration (~ 1,425 km) female school shark in Southwestern Atlantic shelf where it currently classified as Critically Endangered. During austral summer (February 15, 2015), ninety-four sharks were captured (75 females 19 males) tagged with fin tags Nuevo Gulf 42°43’S, 64°53’W, Argentina). A 112 cm total...

Baited Remote Underwater Video Stations (BRUVS) complemented with fishing methods were used to describe the fish assemblage and its seasonal pattern in two marine inlets from Patagonia. The combined results for BRUVS sessions identified 13 species. Our agree biogeographic schemes proposed southern Southwest Atlantic. species belonging Argentine Biogeographic Province presented a peak of maximum abundance (Notorynchus cepedianus Galeorhinus galeus) or recorded during warm months only...

Worldwide, the utilization of underwater video technologies has increased exponentially over last decades for scientific and commercial purposes. The high quality diversity coupled with cost reduction equipment's facilitated its among scientists. Remote Operated Vehicles (ROVs) Drift Cameras (DC) are most used remote operated vehicles. In Argentina, despite reductions use vehicles is still scarce. On this work, a DC equipped novel system to measure objects presented, together data...