Decline in Common Milkweed along Roadsides Around Ottawa, Canada

IF 1.3 4区 环境科学与生态学 Q3 ECOLOGY
S. Lalonde, J. L. McCune, S. Rivest, Heather M. Kharouba
{"title":"Decline in Common Milkweed along Roadsides Around Ottawa, Canada","authors":"S. Lalonde, J. L. McCune, S. Rivest, Heather M. Kharouba","doi":"10.1080/11956860.2021.1943930","DOIUrl":null,"url":null,"abstract":"ABSTRACT Over the past two decades, monarch butterfly populations have been declining. This decline has been partly attributed to the extensive loss of breeding habitat through the reduction of common milkweed (Asclepias syriaca, the larval host plant) through herbicides. While the decline of milkweed has been well documented in the US, less is known about its decline in Canada. To take a first step in quantifying its potential decline, we compared roadside milkweed abundance at sites around Ottawa, Ontario, Canada in 2018, to a county-wide estimate of milkweed abundance in 1943 and 1944. We also evaluated the effect of roadside characteristics on milkweed abundance at these sites. Current milkweed density in the Ottawa region is 33–86% lower than it was 75 years ago. We found milkweed at 67% of our 100 sites and found less milkweed at sites with a higher number of lanes in the road adjacent to the roadside. Interestingly, mowing indices were not significant predictors of milkweed abundance. Here we document the first quantitative evidence for milkweed decline over the past 75 years in Canada, which has likely contributed to the decline of breeding monarchs in Canada.","PeriodicalId":51030,"journal":{"name":"Ecoscience","volume":"29 1","pages":"25 - 37"},"PeriodicalIF":1.3000,"publicationDate":"2021-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/11956860.2021.1943930","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ecoscience","FirstCategoryId":"93","ListUrlMain":"https://doi.org/10.1080/11956860.2021.1943930","RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ECOLOGY","Score":null,"Total":0}
引用次数: 2

Abstract

ABSTRACT Over the past two decades, monarch butterfly populations have been declining. This decline has been partly attributed to the extensive loss of breeding habitat through the reduction of common milkweed (Asclepias syriaca, the larval host plant) through herbicides. While the decline of milkweed has been well documented in the US, less is known about its decline in Canada. To take a first step in quantifying its potential decline, we compared roadside milkweed abundance at sites around Ottawa, Ontario, Canada in 2018, to a county-wide estimate of milkweed abundance in 1943 and 1944. We also evaluated the effect of roadside characteristics on milkweed abundance at these sites. Current milkweed density in the Ottawa region is 33–86% lower than it was 75 years ago. We found milkweed at 67% of our 100 sites and found less milkweed at sites with a higher number of lanes in the road adjacent to the roadside. Interestingly, mowing indices were not significant predictors of milkweed abundance. Here we document the first quantitative evidence for milkweed decline over the past 75 years in Canada, which has likely contributed to the decline of breeding monarchs in Canada.
加拿大渥太华附近路边常见Milkweed的减少
摘要在过去的二十年里,帝王蝶的数量一直在下降。这种下降在一定程度上归因于通过除草剂减少常见的乳草(Asclepias syraca,幼虫寄主植物),导致繁殖栖息地的广泛丧失。虽然马利筋的减少在美国已经有了很好的记录,但在加拿大,人们对它的减少知之甚少。为了迈出量化其潜在下降的第一步,我们将2018年加拿大安大略省渥太华附近的路边乳草丰度与1943年和1944年全县乳草丰度的估计值进行了比较。我们还评估了路边特征对这些地点乳草丰度的影响。渥太华地区目前的乳草密度比75年前低了33-86%。我们在100个地点中的67%发现了乳草,在路边车道数较多的地点发现的乳草较少。有趣的是,割草指数并不是乳草丰度的重要预测因素。在这里,我们记录了过去75年来加拿大乳草数量下降的第一个定量证据,这可能是加拿大繁殖君主数量下降的原因之一。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 求助全文
来源期刊
Ecoscience
Ecoscience 环境科学-生态学
CiteScore
2.80
自引率
0.00%
发文量
13
审稿时长
>36 weeks
期刊介绍: Écoscience, is a multidisciplinary journal that covers all aspects of ecology. The journal welcomes submissions in English or French and publishes original work focusing on patterns and processes at various temporal and spatial scales across different levels of biological organization. Articles include original research, brief communications and reviews.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
确定
请完成安全验证×
copy
已复制链接
快去分享给好友吧!
我知道了
右上角分享
点击右上角分享
0
联系我们:info@booksci.cn Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术官方微信