Abstract
Abstract. The eastern coastline of James Bay (Eeyou Istchee) is known to be home to beds of subarctic eelgrass (Zostera marina L.). These eelgrass beds provide valuable habitat and food source for coastal and marine animals and contribute valuable ecosystem services such as stabilization of the shoreline all along the coast. Despite reports from Cree communities that eelgrass bed health has declined, limited research has been performed to assess and map the spatial distribution of eelgrass within the bay. This study aims to address that issue by evaluating the capability of Landsat-8 Operational Land Imager (OLI) imagery to establish a baseline map of eelgrass distribution in 2019 in the relatively turbid waters of Eeyou Istchee. Three images acquired in September 2019 were merged and classified using Random Forests into the following classes: Eelgrass, Turbid Water, Highly Turbid Water, and Optically Deep Water. The resulting classified image was validated against 108 ground truth data that were obtained from both the eelgrass health and Hydro-Quebec research team. The resulting overall accuracy was 78.7%, indicating the potential of the Random Forests classifier to estimate baseline eelgrass coverage in James Bay using Landsat-8 imagery. This project is part of a Cree driven project, the Coastal Habitat Comprehensive Research Program (CHCRP). The CHCRP aims to combine Cree's traditional knowledge with Western science to better understand environmental changes in the coastal ecosystems and ecosystem services of eastern James Bay. The study is funded by a MITACS grant sponsored by Niskamoon Corporation, an indigenous non-profit organization.
Highlights
Zostera marina L., more commonly known as eelgrass, is a marine flowering plant found in a wide range of coastal marine environments across the Northern Hemisphere (Murphy et al, 2011)
3.1 Class Separability Training areas were delineated for each class (Eelgrass, Turbid Water, Highly Turbid Water, Clear Water) from the image mosaic on September 16 as well as the image obtained on August 26, 2019
Our study presents preliminary results on combining local indigenous knowledge and Landsat-8 Operational Land Imager (OLI) imagery for mapping eelgrass beds in water with high turbidity
Summary
Zostera marina L., more commonly known as eelgrass, is a marine flowering plant found in a wide range of coastal marine environments across the Northern Hemisphere (Murphy et al, 2011). In Eeyou Istchee, eelgrass beds are critical food for waterfowl (Nienhuis, Groenendijk, 1986), for the Canada Geese (Branta canadensis) and Atlantic Brant (B. bernicla rota), as documented by the Cree hunter experience and described in Dignard et al (1991), COMEX (2013), and Royer (2016). To this day, migratory waterfowl hunting is an important activity in coastal communities and contributes to maintaining traditional food security
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