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2 results for “beachgrass”
A novel hybrid beachgrass is invading U.S. Pacific Northwest dunes with potential ecosystem consequences
<p>Invasive plants formed via hybridization, especially those that modify the structure and function of their ecosystems, are of particular concern given the potential for hybrid vigor. In the U.S. Pacific Northwest, two invasive, dune-building beachgrasses, <em>Ammophila arenaria</em> (European beachgrass) and <em>A. breviligulata</em> (American beachgrass) have hybridized and formed a new beachgrass taxa (<em>Ammophila arenaria</em> × <em>A. breviligulata</em>) but little is known about its distribution, spread, and ecological consequences. Here we report on surveys of the hybrid beachgrass conducted across a 250-km range from Moclips, Washington to Pacific City, Oregon in 2021 and 2022. We detected nearly 300 hybrid individuals, or an average of 8–14 hybrid individuals per km of surveyed foredune. The hybrid was more common at sites within southern Washington and northern Oregon where <em>A. breviligulata</em> is abundant (75–90% cover) and <em>A. arenaria</em> is sparse and patchy. The hybrid displayed morphological traits such as shoot density and height that typically exceeded its parent species suggesting hybrid vigor. We measured an average growth rate of 30% over one year, with individuals growing faster at the leading edge of the foredune, nearest the beach. We also found a positive relationship between hybrid abundance and that of <em>A. arenaria</em>, suggesting that <em>A. arenaria</em> density may be a controlling factor for hybridization rate. The hybrid showed similar sand deposition and associated plant species richness patterns compared to its parent species, although longer-term studies are needed. Finally, we found hybrid individuals within and near conservation habitat of two Endangered Species Act-listed, threatened bird species, the western snowy plover (<em>Charadrius alexandrinus nivosus</em>) and the streaked horned lark (<em>Eremophila alpestris strigata</em>), a concern for conservation management. Documenting this emerging hybrid beachgrass provides insights into how hybridization affects the spread of novel species and the consequences for communities in which they invade.</p>
A novel hybrid beachgrass is invading U.S. Pacific Northwest dunes with potential ecosystem consequences
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