Undetected but Widespread: the Cryptic Invasion of Non-Native Cattail (Typha) in a Pacific Northwest Estuary

Abstract

Paper summary generated by OpenAI: This study investigates the cryptic invasion of non-native narrow-leaved cattail (Typha angustifolia) and its hybrid (Typha × glauca) in the Fraser River Estuary, revealing their widespread presence despite previous undetection. Utilizing spectral imagery analysis and species distribution modeling, the research estimates that these invasive species currently occupy approximately 4 or 50 hectares of tidal marshes. The findings indicate that T. × glauca is more abundant, potentially benefiting from heterosis, and highlight the challenges of managing such cryptic invasions due to their morphological similarity to native cattails. The study emphasizes the need for targeted monitoring and early eradication efforts in ecologically sensitive areas, as the invasion is predicted to expand further.