Spectral Reflectance as a Method to Identify the Invasive Tunicate Didemnum vexillum

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Spectral Reflectance as a Method to Identify the Invasive Tunicate Didemnum vexillum

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Title: Spectral Reflectance as a Method to Identify the Invasive Tunicate Didemnum vexillum
Author: Leeuw, T; Boss, ES; Slade, WH
Abstract: The spatial extent of the bottom colonizing invasive tunicate Didemnum vexillum within Gulf of Maine is largely unknown. Current methods for mapping D. vexillum coverage, based on human analysis of images, provide poor spatial resolution and are labor intensive. Here we present an investigation into using measurement of the bottom spectral reflectance to identify D. vexillum. Using two different systems, a NightSea Dive-Spec and a combination of flashlight and a Satlantic hyperspecral radiometer, we collected in-situ measurements of reflectance from which we isolated the reflectance spectrum of D. vexillum. In comparison to other common bottom substrates, D. vexillum appears to be unique in its spectral signature between 500 nm and 675 nm. We have also found evidence that D. vexillum may fluoresce at 550 nm. These findings will be applied to map the distribution D. vexillum from surveys preformed by an autonomous underwater vehicle.
Description: American Academy of Underwater Sciences (http://www.aaus.org/)
URI: http://archive.rubicon-foundation.org/10176
Date: 2011

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