The Horse and Deer Flies (Diptera: Tabanidae) of Rhode Island

Bartlett, Kristen; Alm, Steven R.; LeBrun, Roger A.; Ginsberg, Howard S.

doi:10.1603/0013-8746(2002)095[0547:thadfd]2.0.co;2

2002

DOI: 10.1603/0013-8746(2002)095[0547:thadfd]2.0.co;2

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The Horse and Deer Flies (Diptera: Tabanidae) of Rhode Island

Kristen Bartlett

Steven R. Alm

Roger A. LeBrun

et al.

Abstract: The Tabanidae of Rhode Island were surveyed using Rhode Island canopy traps placed at 20 locations in the state during the summers of 1999 and 2000. In total, 5,120 ßies were collected, which included 55 species in the genera Chrysops, Hybomitra, Tabanus, Merycomyia, and Stonemyia. Distributional and ecological information is provided for each species in Rhode Island.

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2017

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Seasonal Abundance ofTabanus calensand Other Tabanidae (Diptera) Near Snake Mountain, Addison County, Vermont

Freeman

2017

Northeastern Naturalist

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Introduction: Before lunar samples were returned to Earth, it was shown that linear polarization curves and albedo measurements of the moon and asteroids could be used to predict the regolith surface texture of these bodies [1]. The prediction that lunar mare regolith is texturally similar to finely pulverized lava basalts was confirmed by returned lunar samples [2].Our ultimate objective is to use Cassini Imaging Science Subsystem (ISS) Narrow Angle Camera (NAC) images of icy Saturnian satellites -acquired through broadband color and polarization filters -to measure the linear polarizations and corresponding albedos of icy terrains and to characterize implied surface textural properties. In this preliminary study, we demonstrate the sensitivity of ISS NAC polarization images for the analysis of icy satellite surfaces by testing if these images can detect Umov's law, a wellknown inverse relationship between the linear-polarization and albedo of regolith-covered surfaces [3]. Iapetus is our test satellite because its terrain provides a broad range of albedos over which we expect linear polarization to systematically vary. In particular, we will use Cassini Regio's stark contrast with Iapetus' remaining brighter surface to demonstrate Umov's law. Our hypothesis is that the linear polarization of all materials on Iapetus will vary inversely and monotonically with their corresponding albedo.Method: Each ISS NAC polarization observation is a three-image sequence obtained for 0, 60, and 90 degree orientations of the electric field vector, respectively. The polarization filters are used in combination with broadband color filters from a tandem filter wheel, so that changes in polarization with wavelength can be studied. Each image sequence is obtained at approximately constant phase angle. First, the images are radio-metrically calibrated so that pixel DN value represents radiance factors. Camera pointing information is updated using control points and limb locations on the satellite's surfaces. The separate images are spatially co-registered and combined using an algorithm that produces a linear polarization image and a corresponding total intensity (i.e. non-polarized) image [4].To produce albedo images, the total intensity image must be corrected for the gradient in shading

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Seasonal Abundance ofTabanus calensand Other Tabanidae (Diptera) Near Snake Mountain, Addison County, Vermont

Freeman

2017

Northeastern Naturalist

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The Horse and Deer Flies (Diptera: Tabanidae) of Rhode Island

Cited by 1 publication

References 6 publications

Seasonal Abundance ofTabanus calensand Other Tabanidae (Diptera) Near Snake Mountain, Addison County, Vermont

Seasonal Abundance ofTabanus calensand Other Tabanidae (Diptera) Near Snake Mountain, Addison County, Vermont

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