Index Catalog // ScholarsArchive@OSU

The effects of scattering-layer composition, animal size, and numerical density on the frequency response of volume backscatter

Creator:: Benoit-Bird, Kelly J.
Abstract:: Land-associated, sound-scattering layers of mesopelagic micronekton surround the Hawaiian Islands. These animals undergo diel migrations during which they split into multiple, distinct layers that have differences in animal density, taxonomic composition, and size. A video-camera system capable of quantitatively estimating the biological constituency of the layers was combined with a...
Resource Type:: Article
Full Text:: untitled The effects of scattering-layer composition, animal

Bottom-up regulation of a pelagic community through spatial aggregations - not biomass

Creator:: Benoit-Bird, Kelly J. and McManus, Margaret A.
Abstract:: The importance of spatial pattern in ecosystems has long been recognized. However, incorporating patchiness into our understanding of forces regulating ecosystems has proven challenging. We used a combination of continuously sampling moored sensors complemented by shipboard sampling to measure the temporal variation, abundance, and vertical distribution of four trophic levels...
Resource Type:: Article
Full Text:: - regulating structure at each trophic step in this ecosystem, as well as the foraging behaviour of the top

Nocturnal light and lunar cycle effects on diel migration of micronekton

Creator:: Benoit-Bird, Kelly J., Au, Whitlow W. L., and Wisdom, Daniel W.
Abstract:: The roles of nocturnal light and lunar phase in the diel migration of micronekton from a nearshore scattering layer were examined. Migration patterns were measured over six complete lunar cycles using moored upwardlooking echosounders while nocturnal surface irradiance was recorded. We hypothesized that animals would remain at a constant isolume...
Resource Type:: Article
Full Text:: and animal density within the layer. Changes in layer depth and animal density were amplified a small

Phonation behavior of cooperatively foraging spinner dolphins

Creator:: Benoit-Bird, Kelly J. and Au, Whitlow W. L.
Abstract:: Groups of spinner dolphins have been shown to cooperatively herd small prey. It was hypothesized that the strong group coordination is maintained by acoustic communication, specifically by frequency-modulated whistles. Observations of groups of spinner dolphins foraging at night within a sound-scattering layer were made with a multibeam echosounder while the...
Resource Type:: Article
Full Text:: requires that the animal be capable of carrying the instrument pack- age and is relatively invasive. Both

Prey Patch Patterns Predict Habitat Use by Top Marine Predators with Diverse Foraging Strategies

Creator:: Benoit-Bird, Kelly J., Battaile, Brian C., Heppell, Scott A., Hoover, Brian, Irons, David, Jones, Nathan, Kuletz, Kathy J., Nordstrom, Chad A., Paredes, Rosana, Suryan, Robert M., Waluk, Chad M., and Trites, Andrew W.
Abstract:: Spatial coherence between predators and prey has rarely been observed in pelagic marine ecosystems. We used measures of the environment, prey abundance, prey quality, and prey distribution to explain the observed distributions of three co-occurring predator species breeding on islands in the southeastern Bering Sea: black-legged kittiwakes (Rissa tridactyla), thick-billed...
Resource Type:: Article
Full Text:: Benoit-Bird et al. [27]. Ethics Statement All research was conducted in accordance with the Animal Care

Active acoustic examination of the diving behavior of murres foraging on patchy prey

Creator:: Benoit-Bird, Kelly J., Kuletz, Kathy, Heppell, Scott, Jones, Nathan, and Hoover, Brian
Abstract:: During the 2008 and 2009 breeding seasons of murres Uria spp., we combined visual observations of these predators with active acoustics (sonar), fish trawls, zooplankton net tows, and hydrographic measurements in the area surrounding breeding colonies in the southeastern Bering Sea. We acoustically detected thousands of bubble trails that were...
Resource Type:: Article
Full Text:: observations and information from collaborating animal tagging teams. Sampling Visual surveys were conducted

Foraging behavior of northern fur seals closely matches the hierarchical patch scales of prey

Creator:: Benoit-Bird, Kelly J., Battaile, Brian C., Nordstrom, Chad A., and Trites, Andrew W.
Abstract:: Marine prey often occur in hierarchical mosaics whereby small, high-density patches are nested inside of larger, lower density aggregations. We tested the extent to which the foraging behavior of a marine predator (northern fur seal Callorhinus ursinus) could be explained by the hierarchical patch structure of a dominant prey species...
Resource Type:: Article
Full Text:: Sea, St. Paul from 10 July to 19 September, 2009. Each animal was fitted with a Wildlife Computers

Cooperative prey herding by the pelagic dolphin, Stenella longirostris

Creator:: Benoit-Bird, Kelly J. and Au, Whitlow W. L.
Abstract:: Sonar techniques were used to quantitatively observe foraging predators and their prey simultaneously in three dimensions. Spinner dolphins foraged at night in highly coordinated groups of 16–28 individuals using strict four-dimensional patterns to increase prey density by up to 200 times. Herding exploited the prey’s own avoidance behavior to achieve...
Resource Type:: Article
Full Text:: dolphin position, the single strongest echo from each animal was utilized, probably from its lungs, cre

Controlled and in situ target strengths of the jumbo squid Dosidicus gigas and identification of potential acoustic scattering sources

Creator:: Benoit-Bird, Kelly J., Gilly, William F., and Au, Whitlow W. L.
Abstract:: This study presents the first target strength measurements of Dosidicus gigas, a large squid that is a key predator, a significant prey, and the target of an important fishery. Target strength of live, tethered squid was related to mantle length with values standardized to the length squared of −62.0, −67.4,...
Resource Type:: Article
Full Text:: at the posterior of the animal at the left of the photo and two loops tied together and then to the

Coordinated nocturnal behavior of foraging jumbo squid Dosidicus gigas

Creator:: Benoit-Bird, Kelly J. and Gilly, William F.
Abstract:: We used split-beam acoustic techniques to observe free-swimming of jumbo squid Dosidicus gigas during 4 cruises in the Gulf of California. Four-dimensional spatio-temporal data revealed that at night in shallow water, jumbo squid were using ascending, spiral-like swimming paths to emerge from extremely dense aggregations, and were likely foraging on...
Resource Type:: Article
Full Text:: advan- tage (Partridge 1982). The most striking examples of self-organized animal aggregations in the

ScholarsArchive@OSU

The effects of scattering-layer composition, animal size, and numerical density on the frequency response of volume backscatter

Bottom-up regulation of a pelagic community through spatial aggregations - not biomass

Nocturnal light and lunar cycle effects on diel migration of micronekton

Phonation behavior of cooperatively foraging spinner dolphins

Prey Patch Patterns Predict Habitat Use by Top Marine Predators with Diverse Foraging Strategies

Active acoustic examination of the diving behavior of murres foraging on patchy prey

Foraging behavior of northern fur seals closely matches the hierarchical patch scales of prey

Cooperative prey herding by the pelagic dolphin, Stenella longirostris

Controlled and in situ target strengths of the jumbo squid Dosidicus gigas and identification of potential acoustic scattering sources

Coordinated nocturnal behavior of foraging jumbo squid Dosidicus gigas

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