A5044258399- Marine and fisheries research
- Marine animal studies overview
- Fish Ecology and Management Studies
- Marine Bivalve and Aquaculture Studies
- Underwater Acoustics Research
- Isotope Analysis in Ecology
- Ichthyology and Marine Biology
- Coral and Marine Ecosystems Studies
- Marine Biology and Ecology Research
- Identification and Quantification in Food
- Environmental DNA in Biodiversity Studies
- Fish Biology and Ecology Studies
- Avian ecology and behavior
- Maritime Navigation and Safety
- Underwater Vehicles and Communication Systems
- Genetic diversity and population structure
- Data Quality and Management
- Research Data Management Practices
- Marine and coastal plant biology
- Marine Invertebrate Physiology and Ecology
- Morphological variations and asymmetry
- Maritime and Coastal Archaeology
- Marine and coastal ecosystems
- Polar Research and Ecology
- Species Distribution and Climate Change
National Institute of Water and Atmospheric Research
2014-2024
Memorial University of Newfoundland
2001-2002
GTx (United States)
2002
University of Otago
1997-1998
Deepwater fisheries for orange roughy (Hoplostethus atlanticus) and oreos (Pseudocyttus maculatus) in New Zealand waters have been established 2030 years.Over time the become more focused on seamounts, where aggregations of fish can occur spawning or feeding.The catch particular from these features has increased about 30% total 1985 to 80% by 1995, since stabilized at 6070%.There active searching seamount habitat, 2000 known seamounts appropriate depth range had fished.In there are...
Abstract Global models predict that Antarctica has little suitable habitat for macroalgae and Antarctic therefore make a negligible contribution to global carbon fixation. However, coastal surveys are rare at southern polar latitudes (beyond 71° S), here we report diverse abundant macroalgal assemblages in un-navigated habitats of the Ross Sea from 71.5°–74.5° S. We found extensive living depths >70 m specimens crustose coralline algae as deep 125 m. Using light modelling published...
Humans have transformed ecosystems through habitat modification, harvesting, species introduction, and climate change. Changes in distribution composition are often thought to induce biotic homogenization, defined as a decline spatial beta diversity time. However, it is unclear whether homogenization common ocean if changes exhibit linear or more complex dynamics. Here, we assessed patterns of its converse (differentiation) across than 175,000 samples 2,006 demersal fish from 34 regions...
FISHGLOB brings together experts in, and users of, fish monitoring data to support biodiversity research conservation across oceans.
Abstract We model the presence of rare Antarctic blue whales ( Balaenoptera musculus intermedia ) in relation to swarm characteristics their main prey species, krill Euphausia superba ). A combination visual observations and recent advances passive acoustic technology were used locate whales, whilst simultaneously using active underwater acoustics characterise distribution, size, depth, composition density swarms. Krill whale examined at a range spatiotemporal scales investigate sub...
ESP3 is an open-source software to process single-beam and split-beam echosounder data. Multiple displays, analysis tools parameterizable algorithms are available the user scrutinise their data, a scripting module allows applying these entire surveys in batch processing. The infrastructure designed handle large datasets with efficiency consistency. With ESP3, one can implement robust workflows combining automated methods expert decision-making produce quantitative of acoustic backscatter....
Abstract O'Driscoll, R. L., Gauthier, S., and Devine, J. A. 2009. Acoustic estimates of mesopelagic fish: as clear day night? – ICES Journal Marine Science, 66: 1310–1317. The pelagic ecosystem on the Chatham Rise east New Zealand has been monitored annually using acoustic surveys since 2001. Most backscatter comes from diurnally migrating fish, which are major prey hoki (Macruronus novaezelandiae) other valuable commercial species. Mesopelagic schools layers typically occur at 100–400 m...
The diet of Antarctic silverfish Pleuragramma antarcticum was evaluated by examining stomach contents specimens collected in the Ross Sea (71°–77° S; 165°–180° E) January to March 2008. (50–236 mm standard length, L S ) and prey items were analysed for stable‐isotopic composition carbon nitrogen. According index relative importance ( I RI ), which incorporates frequency occurrence, mass number items, most important copepods (81% over all specimens), predominantly Metridia gerlachei...
Spatio-temporal models are widely applied to standardise research survey data and increasingly used generate density maps indices from other sources. We developed a spatio-temporal modelling framework that integrates (treated as “reference dataset”) sources (“non-reference datasets”) while estimating spatially varying catchability for the non-reference datasets. demonstrated it using two case studies. The first involved bottom trawl observer spiny dogfish ( Squalus acanthias) on Chatham...
Abstract Uncrewed surface vehicles (USVs) equipped with echosounders have the potential to replace or enhance acoustic observations from conventional research vessels (RVs), increase spatial and temporal coverage, reduce cost carbon emission. We discuss objectives, system requirements, infrastructure, regulations for using USVs conduct ecological experiments, acoustic-trawl surveys, long-term monitoring. present four example applications of lengths <8 m, highlight some advantages...
Abstract New Zealand seamounts support major fisheries for several deepwater fish species, including orange roughy (Hoplostethus atlanticus) and smooth oreo (Pseudocyttus maculatus). Although a high proportion of features in the depth range 500–1000 m have been fished, very little is known about ecological impacts bottom trawling on seamounts. The potential impact likely to be influenced by spatial extent frequency fishing. A new index presented assess relative intensity fishing effects...
Acoustic scattering experiments involving simultaneous acquisition of broadband echoes and video footage from several Antarctic krill were carried out to determine the effect animal orientation on echo spectral structure. A novel analysis technique, applied extract angle corresponding each insonification, revealed that spectra near broadside incidence relative incident acoustic wave exhibited widely spaced, deep nulls, whereas off-broadside had a more erratic structure, with closely spaced...
Abstract O'Driscoll, R. L., de Joux, P., Nelson, R., Macaulay, G. J., Dunford, A. Marriott, P. M., Stewart, C., and Miller, B. S. 2012. Species identification in seamount fish aggregations using moored underwater video. – ICES Journal of Marine Science, 69: 648–659. Acoustic surveys New Zealand deep-water seamounts often show up to 150 m high on the summit. Although bottom trawls slopes catch predominantly orange roughy (Hoplostethus atlanticus), species composition midwater plumes is...
Abstract Two surveys were carried out in the Ross Sea region during February and March 2004 2008 from New Zealand RV Tangaroa . Fishes sampled on continental shelf slope of Sea, adjacent seamounts to north, mainly using a large demersal fish trawl mesopelagic trawl. Parts stratified by depth at least three random trawls completed each stratum, enabling biomass estimates be calculated. Fish distribution data these two supplemented collections made observers toothfish fishery. A diverse...
Micronekton are a key component of the pelagic food web Chatham Rise east New Zealand. The is an important fishing area for hoki (Macruronus novaezelandiae), Zealand's largest finfish fishery, and predator on mesopelagic fish. Four fisheries oceanographic voyages provided multi-frequency acoustic data (18, 38, 70 120 200 kHz) midwater trawls, which were used to define classification tree separate micronektonic organisms. We carried out validation sensitivity analyses that showed we able...
FISHGLOB brings together experts in, and users of, fish monitoring data to support biodiversity research conservation across oceans.
Abstract The diet of capelin (Mallotus villosus Müller) from six areas off the Newfoundland and Labrador coast was compared over three seasons (January, May–June, August–September) in 1999. A total 1247 stomachs were examined. Of these, 837 (67 %) contained food. proportion empty higher winter (55 than spring (28 or autumn (20 %). Copepods major prey all seasons, occurring 90 % non-empty stomachs. Hyperiid amphipods, euphausiids, larvaceans chaetognaths also important, 30 %, 11 9% 7%...
Analysis of simulated data showed that potential contact statistics could be used to describe spatial pattern in sample density data. Potential is a new method, analogous Ripley's K function for mapped point analysis. can and association over range scales without grouping robust against the presence zeros. The statistical output ecologically interpretable, as measure degree between individuals. This technique was applied examine changes distribution Atlantic cod (Gadus morhua) off...