Index Catalog // Hyrax

LidarBoX: a 3D-printed, Open-source Altimeter System to Improve Photogrammetric Accuracy for off-the-shelf Drones

O Criador:: Bierlich, K. C., Wengrove, Drummond, Bird, Clara N., Davidson, Robert, Chandler, Todd, Torres, Leigh G., and Cantor, Mauricio
Abstract:: Drones provide a privileged birds’-eye view for collecting high-resolution imagery formorphometric and behavioral sampling of animals. Biologically meaningful measurements extracted from overhead images require an accurate estimate of altitude, but current commercial drones include inaccurate barometer estimates. Recent proposals for coupling altimeter systems to drones have provided customized, open-source solutions,...
Resource Type:: Article

The role of allochrony in influencing interspecific differences in foraging distribution during the non-breeding season between two congeneric crested penguin species

O Criador:: Green, Cara-Paige, Ratcliffe, Norman, Mattern, Thomas, Thompson, David, Lea, Mary-Anne, Wotherspoon, Simon, Borboroglu, Pablo Garcia, Ellenberg, Ursula, Morrison, Kyle W., Pütz, Klemens, Sagar, Paul M., Seddon, Philip J., Torres, Leigh G., and Hindell, Mark A.
Abstract:: Mechanisms promoting coexistence between closely related species are fundamental for maintaining species diversity. Mechanisms of niche differentiation include allochrony which offsets the peak timing of resource utilisation between species. Many studies focus on spatial and temporal niche partitioning during the breeding season, few have investigated the role allochrony plays in...
Resource Type:: Article

Do gray whales count calories? Comparing energetic values of gray whale prey across two different feeding grounds in the eastern North Pacific

O Criador:: Hildebrand, Lisa, Bernard, Kim S., and Torres, Leigh G.
Abstract:: Predators must consume enough prey to support costly events, such as reproduction. Meeting high energetic requirements is particularly challenging for migrating baleen whales as their feeding seasons are typically restricted to a limited temporal window and marine prey are notoriously patchy. We assessed the energetic value of the six most...
Resource Type:: Article

Assessment of fecal steroid and thyroid hormone metabolites in eastern North Pacific gray whales

O Criador:: Lemos, Leila S., Olsen, Amy, Smith, Angela, Chandler, Todd E., Larson, Shawn, Hunt, Kathleen, and Torres, Leigh G.
Abstract:: Baleen whale fecal samples have high potential for endocrine monitoring, which can be used as a non-invasive tool to identify the physiological response to disturbance events and describe population health and vital rates. In this study, we used commercial enzyme-linked immunosorbent assays to validate and quantify fecal steroid (progestins, androgens...
Resource Type:: Article

Intra‐ and inter‐annual variation in gray whale body condition on a foraging ground

O Criador:: Soledade Lemos, Leila, Burnett, Jonathan D., Chandler, Todd E., Sumich, James L., and Torres, Leigh G.
Abstract:: Baleen whales store energy gained on foraging grounds to support reproduction and other metabolic needs while fasting for long periods during migration. Whale body condition can be used to monitor foraging success, and thus better understand and anticipate individual‐ and population‐level trends in reproduction and survival. We assessed the body...
Resource Type:: Article

Skin Deep: An Assessment of New Zealand Blue Whale Skin Condition

O Criador:: Barlow, Dawn R., Pepper, Acacia L., and Torres, Leigh G.
Abstract:: Skin condition assessment of wildlife can provide insight into individual and population health. Yet, logistics can limit skin condition assessment of large whales. We developed a standardized, quantitative protocol using photographs to assess skin condition of blue whales in New Zealand, and demonstrate the value gained by testing hypotheses, documenting...
Resource Type:: Article

Acoustic monitoring reveals the times and tides of harbor porpoise (Phocoena phocoena) distribution off central Oregon, U.S.A.

O Criador:: Holdman, Amanda K., Haxel, Joseph H., Klinck, Holger, and Torres, Leigh G.
Abstract:: Harbor porpoises (Phocoena phocoena) are commonly observed in Oregon's nearshore marine environment yet knowledge of their ecosystem use and behavior remains limited, generating concerns for potential impacts on this species from future coastal development. Passive acoustic monitoring was used to investigate spatial and temporal variations in the presence and foraging...
Resource Type:: Article

Estimating morphometric attributes of baleen whales with photogrammetry from small UASs: A case study with blue and gray whales

O Criador:: Burnett, Jonathan D., Lemos, Leila, Barlow, Dawn, Wing, Michael G., Chandler, Todd, and Torres, Leigh G.
Abstract:: Small unmanned aircraft systems (sUASs) are fostering novel approaches to marine mammal research, including baleen whale photogrammetry, by providing new observational perspectives. We collected vertical images of 89 gray and 6 blue whales using low cost sUASs to examine the accuracy of image based morphometry. Moreover, measurements from 192 images...
Resource Type:: Article

Drone Up! Quantifying Whale Behavior From a New Perspective Improves Observational Capacity

O Criador:: Torres, Leigh G., Nieukirk, Sharon L., Lemos, Leila, and Chandler, Todd E.
Abstract:: During traditional boat-based surveys of marine megafauna, behavioral observations are typically limited to records of animal surfacings obtained from a horizontal perspective. Achieving an aerial perspective has been restricted to brief helicopter or airplane based observations that are costly, noisy, and risky. The emergence of commercial small unmanned aerial systems...
Resource Type:: Article

Drone Up! Quantifying Whale Behavior From a New Perspective Improves Observational Capacity

O Criador:: Lemos, Leila, Chandler, Todd E., Torres, Leigh G., and Nieukirk, Sharon L.
Abstract:: During traditional boat-based surveys of marine megafauna, behavioral observations are typically limited to records of animal surfacings obtained from a horizontal perspective. Achieving an aerial perspective has been restricted to brief helicopter or airplane based observations that are costly, noisy, and risky. The emergence of commercial small unmanned aerial systems...
Resource Type:: Article

Hyrax

LidarBoX: a 3D-printed, Open-source Altimeter System to Improve Photogrammetric Accuracy for off-the-shelf Drones

The role of allochrony in influencing interspecific differences in foraging distribution during the non-breeding season between two congeneric crested penguin species

Do gray whales count calories? Comparing energetic values of gray whale prey across two different feeding grounds in the eastern North Pacific

Assessment of fecal steroid and thyroid hormone metabolites in eastern North Pacific gray whales

Intra‐ and inter‐annual variation in gray whale body condition on a foraging ground

Skin Deep: An Assessment of New Zealand Blue Whale Skin Condition

Acoustic monitoring reveals the times and tides of harbor porpoise (Phocoena phocoena) distribution off central Oregon, U.S.A.

Estimating morphometric attributes of baleen whales with photogrammetry from small UASs: A case study with blue and gray whales

Drone Up! Quantifying Whale Behavior From a New Perspective Improves Observational Capacity

Drone Up! Quantifying Whale Behavior From a New Perspective Improves Observational Capacity

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