A5074413866- Ichthyology and Marine Biology
- Fish Ecology and Management Studies
- Marine and fisheries research
- Marine animal studies overview
- Fish Biology and Ecology Studies
- Fish biology, ecology, and behavior
- Identification and Quantification in Food
- Coral and Marine Ecosystems Studies
- Physiological and biochemical adaptations
- Marine and coastal plant biology
- Environmental DNA in Biodiversity Studies
- IPv6, Mobility, Handover, Networks, Security
- Mathematics Education and Programs
- Underwater Vehicles and Communication Systems
- Analytical Chemistry and Sensors
- Synthesis and Characterization of Heterocyclic Compounds
- Online and Blended Learning
- Isotope Analysis in Ecology
- Access Control and Trust
- Underwater Acoustics Research
- Open Education and E-Learning
- Cephalopods and Marine Biology
- Online Learning and Analytics
- Educational Technology and Assessment
- Energetic Materials and Combustion
California State University, Monterey Bay
2015-2024
Southern Adventist University
2023
Bear Valley
2009-2020
Inverness Research (United States)
2004-2011
Point Blue Conservation Science
2002
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...
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...
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...
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...
Spatial and temporal records of 146 predatory attacks by white sharks (Carcharodon carcharias) on four species pinnipeds, one bird, human at the South Farallon Islands, Central California, from late Aug. to early Dec. 198689 are presented. During each 3.5-mo period, were (1) unevenly distributed in bouts separated hiatuses predation, (2) paired temporally within same day, (3) similar times locations consecutive days, (4) all during daylight hours. Predation was observed most often 450 m...
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....
Context Gaining insights into seasonal aggregations of marine megafauna and how patterns vary among demographic groups is pivotal for evaluating anthropogenic risk exposure modeling populations ecosystem dynamics. In California, adult subadult white sharks recurrently aggregate on the coast near pinniped colonies in fall winter months, facilitating comprehensive long-term field studies. Aims this study, we used over 15 years passive acoustic telemetry data to compare dynamics coastal habitat...
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...
To assess long-term temporal trends in White Shark (Carcharadon carcharias) predation, and examine the relationship between C. carcharias pinnipeds, we examined a 17-year (1988–2004) data set of daily shark attack surveys from Southeast Farallon Island (SEFI), California. We modeled within-season among-year variation number observed attacks at SEFI. Within-season, probability was affected by hours effort, date, tide height, pinniped abundance. The seasonal peak predation did not vary...
Determining population trends is critical for evaluating management actions and prioritizing species protections. In this study, we used empirical data to produce an estimate of the trend sub-adult adult white sharks in central California. We unique dorsal fin morphology build a mark-recapture set modified Jolly-Seber model (POPAN formulation) annual abundance then investigate growth rates using parametric bootstrapping methods (males females). For all demographic groups combined, found...
Abstract An animal's movement is influenced by a plethora of internal and external factors, leading to individual‐ habitat‐specific characteristics. This plasticity thought allow individuals exploit diverse environments efficiently. We tested whether the characteristics white sharks Carcharodon carcharias differ across ontogeny among habitats along coast Central California. In doing so, we elucidate how changes in state (physiological coinciding with body size) (differing seascapes and/or...
Abstract Spatial segregation of animals by class (i.e., maturity or sex) within a population due to differential rates temporary emigration ( TE ) from study sites can be an important life history feature consider in assessment and management. However, such are poorly known; new quantitative approaches address these knowledge gaps needed. We present novel application multi‐event models that takes advantage two sources detections differentiate apparent absence quantify double‐marked...
Salmon sharks, Lamna ditropis, occur only in the North Pacific Ocean. These large sharks can grow to 250 cm total length and weigh 220 kg. They are endothermic, previous investigators reported red muscle temperatures of 8–11 C above ambient water temperature. We recorded up 15.6 ambient, along with additional organ temperatures.