A5060244823- Marine and fisheries research
- Marine animal studies overview
- Underwater Acoustics Research
- Oceanographic and Atmospheric Processes
- Ichthyology and Marine Biology
- Marine Bivalve and Aquaculture Studies
- Coral and Marine Ecosystems Studies
- Isotope Analysis in Ecology
- Fish Ecology and Management Studies
- Atmospheric and Environmental Gas Dynamics
- Gas Sensing Nanomaterials and Sensors
- Crustacean biology and ecology
- Identification and Quantification in Food
- Methane Hydrates and Related Phenomena
- Marine and coastal ecosystems
- Synthesis and Characterization of Heterocyclic Compounds
- Marine and coastal plant biology
- Copper-based nanomaterials and applications
- Synthesis and biological activity
- Turtle Biology and Conservation
- Nonlinear Optical Materials Research
- Flow Measurement and Analysis
- ZnO doping and properties
NOAA National Marine Fisheries Service Pacific Islands Fisheries Science Center
2008-2023
NOAA National Marine Fisheries Service
2007-2023
Babeș-Bolyai University
2023
National Oceanic and Atmospheric Administration
2011
Abstract In the pelagic foodweb, micronekton at mid-trophic level (MTL) are one of lesser known components ocean ecosystem despite being a major driver spatial dynamics their predators, which many exploited species (e.g. tunas). The Spatial Ecosystem and Population Dynamics Model is modelling approach that includes representation several epi- mesopelagic MTL functional groups. these groups driven by physical (temperature currents) biogeochemical (primary production, euphotic depth)...
Satellite tagging data for short-finned pilot whales (Globicephala macrorhynchus) and Blainville's beaked (Mesoplodon densirostris) were used to identify core insular foraging regions off the Kona (west) Coast of Hawai'i Island. Ship-based active acoustic surveys oceanographic model output in generalized additive models (GAMs) mixed characterize oceanography these examine relationships between whale density environment. The highest located 1000 2500 m isobaths 250 2000 isobaths,...
Seamounts may influence the distribution of marine mammals through a combination increased ocean mixing, enhanced local productivity and greater prey availability. To study effects seamounts on presence acoustic behaviour cetaceans, we deployed high-frequency recording package summit Cross Seamount during April October 2005. The most frequently detected cetacean vocalizations were echolocation sounds similar to those produced by ziphiid mesoplodont beaked whales together with buzz-type...
Abstract The American Samoa fishing ground is a dynamic region with strong mesoscale eddy activity and temporal variability on scales of <1 week. Seasonal interannual in activity, induced by baroclinic instability that fueled horizontal shear between the eastward‐flowing South Equatorial Counter Current (SECC) westward‐flowing (SEC), seems to play an important role performance longline fishery for albacore. Mesoscale Exclusive Economic Zone (EEZ) peaks from March April, when kinetic...
Abstract The diversity and abundance of fish inhabiting complex reef habitats poses some challenges to surveys based on optical techniques, especially for schooling which are difficult enumerate with such methods. Acoustic often used effectively estimate the distribution but suffer from boundary effects limited species discrimination. To reconcile these drawbacks, we present an integrated acoustic–optical survey method, fishes in a subtropical habitat Shark Bay, Western Australia, exploiting...
Abstract The South Equatorial Counter Current (SECC) strongly influences the American Samoa Exclusive Economic Zone (EEZ) and changes strength on a seasonal ENSO cycle. A strong SECC is associated with predominantly anticyclonic eddy field as well increased micronekton biomass catch‐per‐unit‐effort (CPUE) for albacore tuna, economically important target species of local longline fishery. carries chlorophyll ‐rich waters from upwelling regions at north coast New Guinea towards EEZ, most...
Knowledge of the dynamics micronekton at seamounts is critical to understanding ecological role these ecosystems. Active acoustic techniques are an effective tool monitor distribution and movements pelagic organisms. We carried out several day- nighttime active surveys over a 3-year period (2009-2011) characterize spatial temporal backscatter on two (Condor Gigante) in Azores surrounding open-waters. The highest mean volume backscattering strength (MVBS) was consistently found water column...
To fill data gaps on movements, behaviors and habitat use both near- offshore, two programs were initiated to deploy satellite tags basking sharks. Basking sharks are large filter feeding that second in size only whale Similar many megafauna populations, available suggest populations below historic levels. In the northeast Pacific Ocean, limited information comes from nearshore habitats where they forage. From 2010-2011, four tagged with pop-off archival deployments ranging 9-240 days. The...
Abstract Bigeye tuna (BET) and yellowfin (YFT) are economically important target species of pelagic fisheries worldwide, especially for tropical Pacific nations whose economies food sources heavily affected by commercial sustenance fishing. The El Niño‐Southern Oscillation (ENSO) has a strong effect on the oceanographic conditions in equatorial Pacific, including BET YFT habitat fishing grounds. For optimal management, effects environmental variability such as ENSO stocks performance must be...
Seamounts are globally ubiquitous features with potential for increased biodiversity and biomass, including those of economically important fish. Although their ecological economical importance is well known, the mechanisms supporting seamount-associated communities not understood. In this study, effects an intermediate depth seamount (Cross Seamount) on micronekton communities, forage bigeye tuna, investigated. Relative biomass composition estimates were calculated from multi-frequency...
Here is described the influence of deposition parameters ZnO thin films doped with Ga and co-doped (Ga + Nd) upon structural, morphological, optical electrical properties. The transparent conductive were fabricated by radiofrequency (RF) magnetron sputtering using a power 100 W distance 6 cm. was performed on glass substrates heated at 150 °C time 90 min. doping structure analyzed x-ray diffraction (XRD). Optical transmission measurements showed an 85% transparency in visible range for...
The North Pacific Subtropical Frontal Zone (STFZ) seasonally aggregates economically important fish and protected species. aggregation of top predators is hypothesized to be a response convergent flow at the prominent thermohaline Front (STF) in STFZ sharp northward increase primary productivity, Transition Chlorophyll (TZCF), which thought link productivity via secondary tertiary consumers. Given existing data gaps our knowledge on forage biomass, distribution, composition area,...
Abstract Despite worldwide economic importance of lutjanid snappers, there are critical data gaps hindering accurate abundance estimates these species, thereby impeding stock management efforts. Development an active acoustics method could fill many gaps, significantly benefiting assessment snapper species that form typically mixed-species assemblages in non-trawlable regions. These methods well suited for resource surveys but require the ability to derive size from target strength (TS) and...