Invasive shrubs drain Brazil's palm swamps dry during drought
Alves NF, Costa JP, Morellato P, Oliveira PE
Invasive Species
Palm swamps like the Veredas of central Brazil anchor the dry-season water table that feeds streams across the savanna, and when invasive woody plants take over and drink more water at the end of the dry season, that lifeline for downstream communities and wildlife shrinks.
Researchers used drones to take monthly aerial photos of a palm swamp in Brazil's Cerrado savanna, tracking how green the vegetation stayed over a full year. They found that areas taken over by invading shrubs and trees stayed lush and green much longer into the dry season than the native palm-swamp plants, which means those invaders are pulling more water out of the ground when water is scarcest. On top of that, the invading plants all flower at roughly the same time, while native plants spread their flowering across the year, which could leave pollinators without food during long gaps.
Key Findings
Invaded areas had significantly higher greenness (GCC) than native Vereda vegetation year-round, with the biggest difference during dry-to-wet seasonal transitions.
Flowering among the 3 invasive woody species was highly synchronized (mean vector length r = 0.65), while native Vereda species showed diffuse, spread-out flowering (r = 0.27).
A roughly 3-month shift in peak flowering timing was observed between invasive and native groups, though the difference did not reach statistical significance.
chevron_right Technical Summary
Woody shrubs and trees invading a Brazilian palm swamp stay greener longer into the dry season than the native wetland plants they displace, and their flowering periods clump tightly together rather than spreading across the year. This compresses ecological timing, likely increasing water loss from the wetland at its most vulnerable moment.
Abstract Preview
Original paper
Woody plant encroachment alters the vegetative and reproductive phenology of a Vereda palm swamp in Cerrado.
Woody plant encroachment (WPE) is widespread in savanna and wetland ecosystems, yet its effects on phenological dynamics at fine spatial scales remain poorly quantified. Here, we assessed how woody...
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