Index Catalog // ScholarsArchive@OSU

Creator:: Smirnov, M. Yu and Egbert, G. D.
Abstract:: We describe a new algorithm for robust principal component analysis (PCA) of electromagnetic (EM) array data, extending previously developed multivariate methods to include arrays with large data gaps, and only partial overlap between site occupations. Our approach is based on a criss-cross regression scheme in which polarization parameters and spatial...
Resource Type:: Article

Creator:: Monigle, Patrick W., Nabelek, John, Braunmiller, Jochen, and Carpenter, N. Seth
Abstract:: Low-angle normal faulting is widely discussed as a possible mechanism for continental extension, however, unambiguous evidence for seismogenic low-angle normal faulting is lacking. Here, we investigate seismicity along a short segment of the Pumqu-Xianza Rift (PXR) in southern Tibet, where the HiCLIMB seismic array recorded over 500 earthquakes between 2004...
Resource Type:: Article

Creator:: Egbert, Gary D.
Abstract:: We describe novel hybrid algorithms for inversion of electromagnetic geophysical data, combining the computational and storage efficiency of a conjugate gradient approach with an Occam scheme for regularization and step-length control. The basic algorithm is based on the observation that iterative solution of the symmetric (Gauss-Newton) normal equations with conjugate...
Resource Type:: Article

Creator:: Putman, Nathan F., Scanlan, Michelle M., Pollock, Amanda M., O'Neil, Joseph P., Couture, Ryan B., Stoner, Joseph S., Quinn, Thomas P., Lohmann, Kenneth J., and Noakes, David L.
Abstract:: Organisms use a variety of environmental cues to orient their movements in three-dimensional space. Here, we show that the upward movement of young Chinook salmon (Oncorhynchus tshawytscha) emerging from gravel nests is influenced by the geomagnetic field. Fish in the ambient geomagnetic field travelled farther upwards through substrate than did...
Resource Type:: Article

Creator:: Bayley, Peter B., Castello, Leandro, Batista, Vandick S., and Fabre, Nidia N.
Abstract:: The influence of the flood pulse on fish populations has been posited, but infrequently tested or quantified. Here, we tested the effect of habitat on population size, using Prochilodus nigricans as a case study species. Floodplain habitat was based on the littoral zone area occupied by P. nigricans to feed....
Resource Type:: Article
Full Text:: . Published by the Royal Society under the terms of the Creative Commons Attribution License http

Creator:: Prudic, Kathleen L., Stoehr, Andrew M., Wasik, Bethany R., and Monteiro, Antónia
Abstract:: Some eyespots are thought to deflect attack away from the vulnerable body, yet there is limited empirical evidence for this function and its adaptive advantage. Here, we demonstrate the conspicuous ventral hindwing eyespots found on Bicyclus anynana butterflies protect against invertebrate predators, specifically praying mantids. Wet season (WS) butterflies with...
Resource Type:: Article
Full Text:: plasticity. Proceedings of the Royal Society B: Biological Sciences, 282(1798), 20141531. doi:10.1098/rspb

Creator:: Putman, Nathan F., Mansfield, Katherine L., He, Ruoying, Shaver, Donna J., and Verley, Philippe
Abstract:: The inaccessibility of open ocean habitat and the cryptic nature of small animals are fundamental problems when assessing the distribution of oceanic-stage sea turtles and other marine animals sharing similar life-history traits. Most methods that estimate patterns of abundance cannot be applied in situations that are extremely data limited. Here,...
Resource Type:: Article

Creator:: Putman, Nathan F., Meinke, Amanda M., and Noakes, David L. G.
Abstract:: We used simulated magnetic displacements to test orientation preferences of juvenile steelhead trout (Oncorhynchus mykiss) exposed to magnetic fields existing at the northernmost and southernmost boundaries of their oceanic range. Fish reared in natural magnetic conditions distinguished between these two fields by orienting in opposite directions, with headings that would...
Resource Type:: Article

Creator:: Caluwaerts, Ken, Despraz, Jérémie, Işçen, Atil, Sabelhaus, Andrew P., Bruce, Jonathan, Schrauwen, Benjamin, and SunSpiral, Vytas
Abstract:: To better understand the role of tensegrity structures in biological systems and their application to robotics, the Dynamic Tensegrity Robotics Lab at NASA Ames Research Center, Moffett Field, CA, USA, has developed and validated two software environments for the analysis, simulation and design of tensegrity robots. These tools, along with...
Resource Type:: Article
Full Text:: simulation and hardware validation. Journal of the Royal Society Interface, 11(98), 20140520. doi:10.1098

Creator:: Ebert, Thomas A., Hernández, José Carlos, and Clemente, Sabrina
Abstract:: A wide variety of organisms show morphologically plastic responses to environmental stressors but in general these changes are not reversible. Though less common, reversible morphological structures are shown by a range of species in response to changes in predators, competitors, or food. Theoretical analysis indicates that reversible plasticity increases fitness...
Resource Type:: Article
Full Text:: of jaw allometry in a sea urchin. Proceedings of the Royal Society B: Biological Sciences, 281(1779

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