A5018859861- Ichthyology and Marine Biology
- Fish Ecology and Management Studies
- Marine animal studies overview
- Marine and fisheries research
- Fish biology, ecology, and behavior
- Coral and Marine Ecosystems Studies
- Fish Biology and Ecology Studies
- Identification and Quantification in Food
- Underwater Acoustics Research
- Environmental DNA in Biodiversity Studies
- Turtle Biology and Conservation
- Wildlife Ecology and Conservation
- Animal Vocal Communication and Behavior
- Underwater Vehicles and Communication Systems
- Species Distribution and Climate Change
- Marine Ecology and Invasive Species
- Isotope Analysis in Ecology
- Geographies of human-animal interactions
- Aquaculture disease management and microbiota
- Animal Behavior and Reproduction
- Microbial Community Ecology and Physiology
- Genomics and Phylogenetic Studies
- Target Tracking and Data Fusion in Sensor Networks
- Magnetic and Electromagnetic Effects
- Primate Behavior and Ecology
Oregon State University
2020-2025
Oregon Department of Fish and Wildlife
2020-2025
Pacific University
2012-2024
Stanford University
2012-2024
Oregon State Hospital
2022
The University of Western Australia
2020
Virginia Tech
2020
Zoological Society of London
2020
The London College
2020
University of Delaware
2020
Advances in electronic tagging and genetic research are making it possible to discern population structure for pelagic marine predators once thought be panmictic. However, reconciling migration patterns gene flow define the resolution of discrete management units remains a major challenge, vital conservation priority threatened species such as oceanic sharks. Many have been flagged international protection, yet effective assessments actions hindered by lack knowledge about geographical...
Knowledge of the three-dimensional movement patterns elasmobranchs is vital to understand their ecological roles and exposure anthropogenic pressures. To date, comparative studies among species at global scales have mostly focused on horizontal movements. Our study addresses knowledge gap vertical movements by compiling first synthesis habitat use from data obtained deployment 989 biotelemetry tags 38 elasmobranch species. Elasmobranchs displayed high intra- interspecific variability in...
Space-based tracking technology using low-cost miniature tags is now delivering data on fine-scale animal movement at near-global scale. Linked with remotely sensed environmental data, this offers a biological lens habitat integrity and connectivity for conservation human health; global network of sentinels change.
The white shark (Carcharodon carcharias) is a wide-ranging apex predator in the northeastern Pacific (NEP). Electronic tagging has demonstrated that sharks exhibit regular migratory pattern, occurring at coastal sites during late summer, autumn and early winter moving offshore to oceanic habitats remainder of year, although purpose these migrations remains unclear. this study was use stable isotope analysis (SIA) provide insight into trophic ecology behaviors NEP. Between 2006 2009, 53 were...
Mark-recapture techniques can be used to estimate white shark (Carcharodon carcharias) population abundance. These frameworks are based on assumptions that marks conserved and animals present at the sampling location over entire duration of study. Though these have been validated across short-time scales for sharks, long-term studies trends dependent being valid longer periods. We use 22 years photographic data from aggregation sites in central California support dorsal fin morphology as...
The decline of sharks in the global oceans underscores need for careful assessment and monitoring remaining populations. northeastern Pacific is home range a genetically distinct clade white ( Carcharodon carcharias ). Little known about conservation status this demographically isolated population, concentrated seasonally at two discrete aggregation sites: Central California (CCA) Guadalupe Island, Mexico. We used photo-identification dorsal fins sequential Bayesian mark–recapture algorithm...
An understanding of the role that large marine predators play in structuring trophic flow and nutrient cycling ecosystems requires knowledge their fine-scale (m-km) movement behaviours. In this study, biologging tags were used to reveal new insights into three-dimensional ecology tiger sharks (Galeocerdo cuvier) at Ningaloo Reef, Western Australia. Tags deployed on 21 April-May 2017 for durations 5-48 hours recorded both physical parameters such as depth temperature, and, through use...
Elucidating how mobile ocean predators utilize the pelagic environment is vital to understanding dynamics of oceanic species and ecosystems. Pop-up archival transmitting (PAT) tags have emerged as an important tool describe animal migrations in environments where direct observation not feasible. Available PAT tag data, however, are for most part limited geographic position, swimming depth environmental temperature, making effective behavioral challenging. However, novel analysis approaches...
Marine protected areas (MPAs) have become an increasingly important tool to protect and conserve marine resources. However, there remains much debate about how effective MPAs are, especially in terms of their ability mobile species such as teleost chondrichthyan fishes. We used satellite acoustic tags assess the a large oceanic MPA, British Indian Ocean Territory MPA (BIOT MPA), seven pelagic reef-associated tagged 26 animals from six (Blue Marlin, Reef Mantas, Sailfish, Silky Sharks,...
Abstract Predatory behavior and top-down effects in marine ecosystems are well-described, however, intraguild interactions among co-occurring top predators remain less understood, but can have far reaching ecological implications. Killer whales white sharks prominent upper trophic level with highly-overlapping niches, yet their subsequent remained obscure. Using long-term electronic tagging survey data we reveal rare cryptic between these at a shared foraging site, Southeast Farallon Island...
Abstract Large, remote marine protected areas (MPAs) containing both reef and pelagic habitats, have been shown to offer considerable refuge populations of reef‐associated sharks. Many large MPAs are, however, impacted by illegal fishing activity conducted unlicensed vessels. While enforcement these reserves is often expensive, it would likely benefit from the integration ecological data on mobile animals they are designed protect. Consequently, shark in some continue decline, as remain a...
Acoustic tagging is typically used to gather data on the spatial ecology of diverse marine taxa, informing questions about spatio-temporal attributes such as residency and home range, but detection may also reveal unanticipated insights. Many species demonstrate predictable site fidelity, so a sudden cessation detections for multiple individuals be evidence an atypical event. During 2013 2014, we acoustically tagged 47 grey reef sharks (Carcharhinus amblyrhynchos) 48 silvertip...
Many marine species are difficult to study because components of their lifecycles occur solely or partially outside the observable realm researchers. Advances in biologging tags have begun give us glimpses into these unobservable states. However, many require rigid attachment animals, which normally requires catching and restraining animals. These methods become prohibitive with large, dangerous, rare species, such as large predatory sharks, can significant consequences for individual...
Silky sharks ( Carcharhinus falciformis ) represent a major component of global shark catch, both directly and as bycatch, populations are declining result. An improved understanding their movement ecology is needed to support conservation efforts. We deployed satellite acoustic tags (2013–2018) analyzed historical fisheries records (1997–2009), investigate the spatial silky in central Indian Ocean large Marine Protected Area (MPA; 640,000 km 2 around Chagos Archipelago. observed high...
Abstract Elasmobranchs are highly diverse in movement, sensory capacity, and behavioural responses to the environment, leading differences function nature of associations interactions between individuals, populations, species. The term “aggregation” has been widely variably used describe co-occurrence across elasmobranch species, but its defining criteria remain vague indeterminate. lack standardized terminology hinders comparisons studies, systems. It can cause misinterpretation about...
Environmental DNA (eDNA) methods are being increasingly used in proof-of-concept studies to detect shark species, many populations of which experiencing severe declines. These widely seen as the future biodiversity monitoring, but they have yet become established routine monitoring techniques for elasmobranch species. Here, we developed species-specific quantitative PCR assays detection grey reef (Carcharhinus amblyrhynchos) and silvertip albimarginatus). We assessed whether eDNA could infer...
ABSTRACT Elasmobranchs (i.e., sharks, skates, rays), known for their cognitive abilities and complex behaviours, often form aggregations that are thought to be crucial survival evolutionary success. However, understanding the drivers behind these remains challenging due dynamism of marine environment difficulty observing species directly. Here, we aim address challenges by introducing a methodological framework analysing catch data infer aggregation behaviour. Within this framework, outline...
Abstract A wide array of technologies are available for gaining insight into the movement wild aquatic animals. Although acoustic telemetry can lack fine‐scale spatial resolution some satellite tracking technologies, substantially longer battery life yield important long‐term data on individual behavior and low per‐unit cost. Typically, however, receiver arrays designed to maximize coverage at cost positional accuracy leading potentially detection gaps as individuals move out range between...
The white shark (Carcharodon carcharias) is a globally distributed, ecologically important top predator whose biology and population dynamics are challenging to study. Basic biological parameters remain virtually unknown in the Mediterranean Sea due its historically low density, dwindling size, lack of substantial sightings. White sharks considered Critically Endangered Sea, recent analyses suggest that has declined by 52% 96% from historical levels different sectors (Moro et al., 2020)....
Quantifying life history parameters of marine top predators such as sharks is challenging, observations are difficult. However, these critical for accurate population assessments and understanding dynamics. Using mark recapture at white shark foraging aggregation sites, we tested differences in survival between sexes estimated apparent sub-adult adult neritic waters off central California. We used six years mark-recapture data a model that accounted imperfect detection sex assignment....
Motion detecting archival data loggers such as accelerometers have become increasingly important in animal biotelemetry and offer unique insights into behavior, energetics, kinematics. However, challenges remain for successful deployment interpretation of from captive wild animals. Accelerometer sensors require being packaged an tag that has a firm attachment fixed (known) orientation to accurately measure the relevant motion animal. This requirement can lead handling stress techniques...
Abstract High population density should drive individuals to more frequently share space and interact, producing better-connected spatial social networks. Despite this widely-held assumption, it remains unconfirmed how local generally drives individuals’ positions within wild animal We analysed 34 datasets of simultaneous behaviour in >55,000 individual animals, spanning 28 species fish, reptiles, birds, mammals, insects. >80% systems exhibited strongly positive relationships between...