Stanford Advisors

All Publications

  • Salmon shark seasonal site fidelity demonstrates the influence of scale on identifying potential high-use areas and vulnerabilities MARINE ECOLOGY PROGRESS SERIES Arnoldi, N. S., Carlisle, A. B., Andrzejaczek, S., Castleton, M. R., Micheli, F., Schallert, R. J., White, T. D., Block, B. A. 2024; 735: 125-140

    View details for DOI 10.3354/meps14565

    View details for Web of Science ID 001214316400004

  • Multi-taxa marine isoscapes provide insight into large-scale trophic dynamics in the North Pacific PROGRESS IN OCEANOGRAPHY Arnoldi, N. S., Litvin, S. Y., Madigan, D. J., Micheli, F., Carlisle, A. 2023; 213
  • Emergent research and priorities for shark and ray conservation ENDANGERED SPECIES RESEARCH Jorgensen, S. J., Micheli, F., White, T. D., Van Houtan, K. S., Alfaro-Shigueto, J., Andrzejaczek, S., Arnoldi, N. S., Baum, J. K., Block, B., Britten, G. L., Butner, C., Caballero, S., Cardenosa, D., Chapple, T. K., Clarke, S., Cortes, E., Dulvy, N. K., Fowler, S., Gallagher, A. J., Gilman, E., Godley, B. J., Graham, R. T., Hammerschlag, N., Harry, A., Heithaus, M. R., Hutchinson, M., Huveneers, C., Lowe, C. G., Lucifora, L. O., MacKeracher, T., Mangel, J. C., Martins, A., McCauley, D. J., McClenachan, L., Mull, C., Natanson, L. J., Pauly, D., Pazmino, D. A., Pistevos, J. A., Queiroz, N., Roff, G., Shea, B. D., Simpfendorfer, C. A., Sims, D. W., Ward-Paige, C., Worm, B., Ferretti, F. 2022; 47: 171-203

    View details for DOI 10.3354/esr01169

    View details for Web of Science ID 000790066600013

  • An illicit artisanal fishery for North Pacific white sharks indicates frequent occurrence and high mortality in the Gulf of California CONSERVATION LETTERS Madigan, D. J., Arnoldi, N. S., Hussey, N. E., Carlisle, A. B. 2021

    View details for DOI 10.1111/conl.12796

    View details for Web of Science ID 000621570100001

  • Reverse diel vertical movements of oceanic manta rays off the northern coast of Peru and implications for conservation ECOLOGICAL SOLUTIONS AND EVIDENCE Andrzejaczek, S., Schallert, R. J., Forsberg, K., Arnoldi, N. S., Cabanillas-Torpoco, M., Purizaca, W., Block, B. A. 2021; 2 (1)
  • Eating or Meeting? Cluster Analysis Reveals Intricacies of White Shark (Carcharodon carcharias) Migration and Offshore Behavior PLOS ONE Jorgensen, S. J., Arnoldi, N. S., Estess, E. E., Chapple, T. K., Rueckert, M., Anderson, S. D., Block, B. A. 2012; 7 (10)


    Elucidating how mobile ocean predators utilize the pelagic environment is vital to understanding the dynamics of oceanic species and ecosystems. Pop-up archival transmitting (PAT) tags have emerged as an important tool to describe animal migrations in oceanic environments where direct observation is not feasible. Available PAT tag data, however, are for the most part limited to geographic position, swimming depth and environmental temperature, making effective behavioral observation challenging. However, novel analysis approaches have the potential to extend the interpretive power of these limited observations. Here we developed an approach based on clustering analysis of PAT daily time-at-depth histogram records to distinguish behavioral modes in white sharks (Carcharodon carcharias). We found four dominant and distinctive behavioral clusters matching previously described behavioral patterns, including two distinctive offshore diving modes. Once validated, we mapped behavior mode occurrence in space and time. Our results demonstrate spatial, temporal and sex-based structure in the diving behavior of white sharks in the northeastern Pacific previously unrecognized including behavioral and migratory patterns resembling those of species with lek mating systems. We discuss our findings, in combination with available life history and environmental data, and propose specific testable hypotheses to distinguish between mating and foraging in northeastern Pacific white sharks that can provide a framework for future work. Our methodology can be applied to similar datasets from other species to further define behaviors during unobservable phases.

    View details for DOI 10.1371/journal.pone.0047819

    View details for Web of Science ID 000310705300018

    View details for PubMedID 23144707

    View details for PubMedCentralID PMC3483152