Native shrubs senesce earlier and faster than non-native shrubs in a temperate deciduous woodland in south-eastern Wisconsin, USA.
Donnelly A, Jatmiko EM
Invasive Species
Invasive shrubs lining your local woodland trail are quietly stealing autumn sunlight from native wildflowers and tree seedlings by staying green three weeks longer — delaying the leaf-litter pulse that soil organisms and spring ephemerals depend on.
Researchers watched native and non-native shrubs in a small Wisconsin woodland for six years and found that the invasive shrubs keep their green leaves much longer into fall — about three weeks more than the native ones. Native shrubs drop their leaves gradually and earlier, while the non-natives hold on and then lose chlorophyll more abruptly. This matters because those extra weeks of green leaves change how much light reaches the forest floor and when dead leaves fall to feed the soil.
Key Findings
Non-native shrubs retain green leaves approximately 3 weeks longer into autumn than native shrubs, based on twice-weekly observations from 2018–2024.
Chlorophyll meter (SPAD) readings confirm prolonged chlorophyll retention in non-native shrubs, followed by a more abrupt decline compared to the gradual senescence seen in native species.
The extended growing season of non-native shrubs affects understory light availability timing and delays organic matter input for soil nutrient cycling.
chevron_right Technical Summary
Non-native shrubs in a Wisconsin woodland hold onto their green leaves about three weeks longer into autumn than native shrubs, which lose leaves earlier and more gradually. This extended growing season for invasives has real consequences for how light, nutrients, and habitat are distributed in forest understories.
Abstract Preview
Shrubs, both native and non-native, play a pivotal role in temperate deciduous forest dynamics by providing food and habitat for a range of organisms, contributing to nutrient and carbon cycling an...
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