Invasive Species Compendium

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Analysis of the invasion of water lilies (Eichhornia crassipes (Mart) Solms) in the Cointzio Dam, Michoacán, Mexico.

Abstract

Objective: to analyze the growth dynamics of the water lily (Eichhornia crassipes) in the Cointzio dam due to the water availability. Design/Methodology/Approach: a monthly series of 45 Sentinel 2 and Landsat satellite images were used, with which the percentage of invasion of the water lily in the total area of the reservoir was calculated. The relative coverage of the lily was analyzed looking for growth patterns over time, as well as the precipitation data, total reservoir area over time, and water storage data for the 2010-2020 period to broaden its context. Results: Three ascending and two descending patterns of the water lily coverage were identified; a 15-month upward growth pattern with slight inland slope changes; decreasing patterns are associated with decreased water storage. The largest lily covers were found in critical storage stages during the 2010-2020 period. Study limitations/implications: faced with climate change conditions, the filling pattern of the dam could change, aggravating problems related to the water supply. Conclusions: containment/mitigation efforts have a reduced effect because the lily easily recovers the covered area, growing about 400% between October 2017 and June 2018, therefore it is necessary to implement a containment strategy using the biophysical interactions of the basin in conjunction with social, political, economic and governance interactions.