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Remote identification of the invasive tunicate Didemnum vexillum using reflectance spectroscopy

机译：使用反射光谱法远程鉴定有创的被膜Dedemnum vexillum

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摘要

Benthic coverage of the invasive tunicate Didemnum vexillum on Georges Bank is largely unknown. Monitoring of D. vexillum coverage is vital to understanding the impact this invasive species will have on the productive fishing grounds of Georges Bank. Here we investigate using reflectance spectroscopy as a method for remote identification of D. vexillum. Using two different systems, a NightSea Dive-Spec and a combination of LED light sources with a hyperspectral radiometer, we collected in-situ measurements of reflectance from D. vexillum colonies. In comparison to reflectance spectra of other common benthic substrates, D. vexillum appears to have a unique spectral signature between 500 and 600 nm. Measuring the slope of the spectrum between these wavelengths appears to be the most robust method for spectral identification. Using derivative analysis or principal component analysis, the reflectance spectra of D. vexillum can be identified among numerous other spectra of common benthic substrates. An optical system consisting of a radiometer, light source, and camera was deployed on a remotely operated vehicle to test the feasibility of using reflectance to assess D. vexillum coverage. Preliminary results, analyzed here, prove the method to be successful for the areas we surveyed and open the way for its use on large-scale surveys.
机译：在Georges Bank上，侵入性被膜Dedemnum vexillum的底栖生物覆盖率尚不清楚。监测葡萄柚的覆盖范围对于了解这种入侵物种将对乔治银行的生产性捕鱼场造成的影响至关重要。在这里，我们调查使用反射光谱作为远程鉴定D. vexillum的方法。我们使用两种不同的系统，即NightSea Dive-Spec和将LED光源与高光谱辐射计结合使用，从现场收集了D. vexillum菌落的反射率测量值。与其他常见底栖底物的反射光谱相比，维氏假单胞菌似乎在500至600 nm之间具有独特的光谱特征。测量这些波长之间的光谱斜率似乎是最可靠的光谱识别方法。使用导数分析或主成分分析，可以在常见底栖生物的众多其他光谱中识别出D. vexillum的反射光谱。一个由辐射计，光源和照相机组成的光学系统被部署在远程操作的车辆上，以测试使用反射率来评估维氏螺旋体覆盖率的可行性。初步结果在此进行了分析，证明了该方法在我们所调查的领域中是成功的，并为大规模调查中的使用开辟了道路。

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