A substantial eastern disjunction of Douglas’ Knotweed (Polygonum douglasii Greene, Polygonaceae) in New Brunswick, Canada

Q4 Agricultural and Biological Sciences

The Canadian Field-Naturalist Pub Date : 2024-01-15 DOI:10.22621/cfn.v137i1.3115

Sean Blaney, Gart Bishop, Stephen Clayden, James Goltz

引用次数: 0

Abstract

We report an isolated population of the native annual Douglas’ Knotweed (Polygonum douglasii Greene) from a dry, south-facing outcrop of conglomerate and sandstone at Big Bluff, near Sussex Corner, New Brunswick, Canada, consisting of about 2500 plants in 2018 and 2022. This occurrence is disjunct by ~450 km from the eastern limit of the known range of Douglas’ Knotweed in southwestern Maine, USA. The nearest known occurrence in Canada is in southern Quebec, ~660 km from Big Bluff. Several lines of evidence indicate that the population in New Brunswick is native. New state records for Wisconsin and Alaska found in online data sources are also verified.

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加拿大新不伦瑞克省道格拉斯结缕草（Polygonum douglasii Greene，蓼科）在东部的大量分离

我们报告了一个本地一年生道格拉斯结缕草（Polygonum douglasii Greene）的孤立种群，该种群位于加拿大新不伦瑞克省苏塞克斯角（Sussex Corner）附近的大悬崖（Big Bluff），地处干燥、朝南的砾岩和砂岩露头，2018年和2022年的植株数量约为2500株。该分布区与美国缅因州西南部道格拉斯结缕草已知分布区东部界限相距约 450 公里。加拿大最近的已知分布区位于魁北克南部，距离大悬崖约 660 公里。一些证据表明，新不伦瑞克省的种群是原生种。在线数据源中发现的威斯康星州和阿拉斯加州的新记录也得到了验证。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

The Canadian Field-Naturalist Agricultural and Biological Sciences-Ecology, Evolution, Behavior and Systematics

CiteScore

0.60

自引率

0.00%

发文量

期刊介绍： The Canadian Field-Naturalist (ISSN: 0008-3550) publishes scientific papers by amateur and professional naturalists and field biologists, reporting observations and results of investigations in any field of natural history, provided they are original, significant, and relevant to Canada.