A5016052842- Marine animal studies overview
- Fish Ecology and Management Studies
- Marine and fisheries research
- Ichthyology and Marine Biology
- Wildlife Ecology and Conservation
- Coral and Marine Ecosystems Studies
- Diffusion and Search Dynamics
- Avian ecology and behavior
- Arctic and Antarctic ice dynamics
- Animal Behavior and Reproduction
- Species Distribution and Climate Change
- Marine Bivalve and Aquaculture Studies
- Animal Vocal Communication and Behavior
- Environmental DNA in Biodiversity Studies
- Fish Biology and Ecology Studies
- Water Quality Monitoring Technologies
- Bayesian Methods and Mixture Models
- Oceanographic and Atmospheric Processes
- Cryospheric studies and observations
- Fish biology, ecology, and behavior
- Marine and coastal plant biology
- Time Series Analysis and Forecasting
- Advanced Database Systems and Queries
- Evolution and Genetic Dynamics
- Target Tracking and Data Fusion in Sensor Networks
CSIRO Oceans and Atmosphere
2015-2024
Commonwealth Scientific and Industrial Research Organisation
2013-2024
Health Sciences and Nutrition
2022
Technical University of Denmark
2011
University of Tasmania
2008-2010
Secretariat of the Pacific Community
2008
University of Hawaiʻi at Mānoa
2008
Summary Due to the substantial progress in tracking technology, recent years have seen an explosion amount of movement data being collected. This has led a huge demand for statistical tools that allow ecologists draw meaningful inference from large sets. The class hidden Markov models (HMMs) matches intuitive understanding animal is driven by underlying behavioural modes and proven be very useful analysing data. For involve regular sampling unit negligible measurement error, these usually...
1. Linking the movement and behaviour of animals to their environment is a central problem in ecology. Through use electronic tagging tracking (ETT), collection situ data from free-roaming now commonplace, yet statistical approaches enabling direct relation observations environmental conditions are still development. 2. In this study, we examine hidden Markov model (HMM) for behavioural analysis data. HMMs allow prediction latent states while directly accounting serial dependence prevalent...
Abstract In the Southern Ocean, wide‐ranging predators offer opportunity to quantify how animals respond differences in environment because their behavior and population trends are an integrated signal of prevailing conditions within multiple marine habitats. elephant seals particular, can provide useful insights due circumpolar distribution, long distant migrations performance extended bouts deep diving. Furthermore, across range, seal populations have very different trends. this study, we...
Like many species, movement patterns of southern elephant seals (Mirounga leonina) are being influenced by long-term environmental change. These migrate up to 4,000 km from their breeding colonies, foraging for months in a variety Southern Ocean habitats. Understanding how vary with features and these relationships differ among individuals employing different strategies can provide insight into performance at population level. We apply new fast-estimation tools fit mixed effects within...
Abstract Animal tracking data are indispensable for understanding the ecology, behaviour and physiology of mobile or cryptic species. Meaningful signals in these can be obscured by noise due to imperfect measurement technologies, requiring rigorous quality control as part any comprehensive analysis. State–space models powerful tools that separate signal from noise. These ideal error‐prone location inferring where animals what they doing when record transmit other information. However,...
Conservation concerns exist for many sharks but robust estimates of abundance are often lacking. Improving population status is a performance measure species under conservation or recovery plans, yet the lack data permitting estimation size means efficacy management actions can be difficult to assess, and achieving goal removing from listing challenging. For potentially dangerous species, like white shark, balancing public safety demands politically socially complex, leading vigorous debate...
Satellite telemetry data are a key source of animal distribution information for marine ecosystem management and conservation activities. We used two decades from the East Antarctic sector Southern Ocean. Habitat utilization models spring/summer period were developed six highly abundant, wide‐ranging meso‐ top‐predator species: Adélie Pygoscelis adeliae emperor Aptenodytes forsteri penguins, light‐mantled albatross Phoebetria palpebrata , fur seals Arctocephalus gazella southern elephant...
Summary Use of accelerometers is now widespread within animal biologging as they provide a means measuring an animal's activity in meaningful and quantitative way where direct observation not possible. In sequential acceleration data, there natural dependence between observations behaviour, fact that has been largely ignored most analyses. Analyses data serial explicitly modelled have relied on hidden Markov models ( HMM s). Depending the aim analysis, can be used for state prediction or to...
Group dynamic movement is a fundamental aspect of many species' movements. The need to adequately model individuals' interactions with other group members has been recognised, particularly in order differentiate the role social forces individual from environmental factors. However, date, practical statistical methods which can include dynamics animal models have lacking. We consider flexible modelling framework that distinguishes group-level model, describing group's centre, and an...
We present a process‐based approach to estimate residency and behavior from uncertain temporally correlated movement data collected with electronic tags. The estimation problem is formulated as hidden Markov model (HMM) on spatial grid in continuous time, which allows straightforward implementation of barriers movement. Using the explicitly resolve space, location can be supplemented by or based entirely environmental (e.g. temperature, daylight). HMM method therefore analyze any type tag...
State-space models are important tools for quality control of error-prone animal movement data. The near real-time (within 24 h) capability the Argos satellite system aids dynamic ocean management human activities by informing when animals enter intensive use zones. This also facilitates observations from animal-borne sensors in operational forecasting models. Such data provision requires rapid, reliable to deal with locations. We formulate a continuous-time state-space model three types...
Recent studies have applied state–space models to satellite telemetry data in order remove noise from raw location estimates and infer the true tracks of animals. However, while resulting may appear plausible, it is difficult determine accuracy estimated positions, especially for position interpolated times between locations. In this study, we use two gray seals ( Halichoerus grypus ) carrying tags that transmitted Fastloc GPS positions via Argos satellites. This combination Service highly...
1. Seasonal long-distance migrations are often expected to be related resource distribution, and foraging theory predicts that animals should spend more time in areas with relatively richer resources. Yet for highly migratory marine species, data on feeding success difficult obtain. We analysed the temporal patterns of wild juvenile southern bluefin tuna from visceral warming recorded by archival tags implanted within body cavity. 2. Data collected during 1998-2000 totalled 6221 days,...
The harbour seal (Phoca vitulina) is a widespread marine predator in Northern Hemisphere waters. British populations have been subject to rapid declines recent years. Food supply or inter-specific competition may be implicated but basic ecological data are lacking and there few studies of foraging distribution habits. In this study, satellite tagging conducted at the major haul outs around Isles showed both that movements were highly variable among individuals strategy appears specialized...
The effects of climate change constitute a major concern in Arctic waters due to the rapid decline sea ice, which may strongly alter movements and habitat availability marine mammals. We tracked 98 bowhead whales by satellite over an 11-year period (2001-2011) Baffin Bay - West Greenland investigate environmental drivers (specifically surface temperature ice) involved whale's movements. Movement patterns differed according season, with aggregations found at higher latitudes during spring...
Abstract In Australian and New Zealand waters, current knowledge on white shark ( Carcharodon carcharias ) movement ecology is based individual tracking studies using relatively small numbers of tags. These describe a species that occupies highly variable complex habitats. However, uncertainty remains as to whether the proposed patterns are representative wider population. Here, we tagged 103 immature Australasian sharks (147–350 cm fork length) with both acoustic satellite transmitters...
The behavior of colony-based marine predators is the focus much research globally. Large telemetry and tracking data sets have been collected for this group animals, are accompanied by many empirical studies that seek to segment tracks in some useful way, as well theoretical optimal foraging strategies. However, relatively few detailed statistical methods inferring behaviors central place trips. In paper we describe an approach based on hidden Markov models, which splits trips into segments...
Foraging theory predicts that mobile predators should target high profitability areas with plentiful resources and minimize time spent moving between these areas. This has led to a focus in recent literature on the identification of “hotspots” important for migratory marine predators, i.e., regions where spend disproportionate amounts ostensibly due prey abundance; determination environmental features characteristic such We investigated factors predicting foraging success southern bluefin...
Management of species with wide-ranging migrations is a complex issue, made more challenging when the both protected and poses risk to humans. Understanding oceanic conditions associated shark habitat use can help develop mitigation strategies or warning systems that meet conservation human safety objectives. Using satellite tracks from 77 juvenile sub-adult white sharks tagged over 10 yr, we modelled individual movement patterns using hidden Markov models applied generalised additive...