1 March 2017 Demography of Invasive Black and Pale Swallow-Wort Populations in New York
Lindsey R. Milbrath, Adam S. Davis, Jeromy Biazzo
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Vincetoxicum nigrum (Black Swallow-wort) and Vincetoxicum rossicum (Pale Swallow-wort) are perennial, twining vines introduced from Europe. Both species have become invasive in northeastern North America in a variety of habitats. To develop parameters for a population model for evaluating the control of swallow-worts, including biological control, we collected data from 5 life stages on 20 different demographic rates involving fecundity, germination, survival, and growth. We monitored 2 field and 2 forest populations of Pale Swallow-wort, and 2 field populations of Black Swallow-wort in New York State using a combination of marked individuals and sowing plots. Both species showed moderate to high rates of seed germination and high survival of seedlings, with the primary exception of a heavily shaded forest population. Survival generally continued to remain high postestablishment, although transitions to different life stages varied by species, location, and habitat. Black Swallow-wort became reproductive more quickly than Pale Swallow-wort. These data add to the knowledge of swallow-wort demography and may offer insights into the continued expansion and control of these invasive plants.

Lindsey R. Milbrath, Adam S. Davis, and Jeromy Biazzo "Demography of Invasive Black and Pale Swallow-Wort Populations in New York," Northeastern Naturalist 24(1), 37-53, (1 March 2017). https://doi.org/10.1656/045.024.0104
Published: 1 March 2017
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