References
- Alvarez MBX, Carrera-Treviño R, Hobson KA. 2019. Mortality of monarch butterflies (Danaus plexippus) at two highway crossing “hotspots” during autumn migration in Northeast Mexico. Front Ecol Evol. 7:273. doi:https://doi.org/10.3389/fevo.2019.00273.
- Arnholt AT, Evans B. 2017. BSDA: basic statistics and data analysis. R package version 1.2.0. [accessed 2021 Feb 26]. https://cran.r-project.org/web/packages/BSDA/index.html.
- Baum KA, Mueller EK. 2015. Grassland and roadside management practices affect milkweed abundance and opportunities for monarch recruitment. In: Oberhauser KS, Nail KR, Altizer S, editors. Monarchs in a changing world: biology and conservation of an iconic butterfly. Ithaca (NY): Cornell University Press; p. 197–202.
- Baum KA, Sharber WV. 2012. Fire creates host plant patches for monarch butterflies. Biol Lett. 8(6):968–971. doi:https://doi.org/10.1098/rsbl.2012.0550.
- Berkman B. 1949. Milkweed: a war strategic material and a potential industrial crop for sub-marginal lands in the United States. Econ Bot. 3(3):223–239. doi:https://doi.org/10.1007/BF02859094.
- Bernes C, Bullock JM, Jakobsson S, Rundlöf M, Verheyen K, Lindborg R. 2017. How are biodiversity and dispersal of species affected by the management of roadsides? A systematic map. Environ Evid. 6(1):1–16. doi:https://doi.org/10.1186/s13750-017-0103-1.
- Bhowmik PC. 1994. Biology and control of common milkweed (Asclepias syriaca). Rev Weed Sci. 6:227–250.
- Bhowmik PC, Bandeen JD. 1976. The biology of Canadian weeds: 19. Asclepias syriaca L. Can J Plant Sci. 56(3):579–589. doi:https://doi.org/10.4141/cjps76-094.
- Borders B, Lee-Mäder E. 2014. Milkweeds: a conservation practitioner’s guide. Portland (OR): The Xerces Society for Invertebrate Conservation; p. 143.
- Boyle JH, Dalgleish HJ, Puzey JR. 2019. Monarch butterfly and milkweed declines substantially predate the use of genetically modified crops. Proc Natl Acad Sci USA. 116(8):3006–3011. doi:https://doi.org/10.1073/pnas.1811437116.
- Brower LP, Taylor OR, Williams EH, Slayback DA, Zubieta RR, Ramírez MI. 2012. Decline of monarch butterflies overwintering in Mexico: is the migratory phenomenon at risk? Insect Conserv Divers. 5(2):95–100. doi:https://doi.org/10.1111/j.1752-4598.2011.00142.x.
- Brower LP, Williams EH, Dunford KS, Dunford JC, Knight AL, Daniels J, Cohen JA, Van Hook T, Saarinen E, Standridge MJ, et al. 2018. A long-term survey of spring monarch butterflies in north-central Florida. J Nat Hist. 52(31–32):2025–2046. doi:https://doi.org/10.1080/00222933.2018.1510057.
- Burnham KP, Anderson DR. 1998. Model selection and multimodel inference: a practical information-theoretic approach. 2nd ed. New York (NY): Springer.
- Canadensys. 2020. Asclepias syriaca Linnaeus. [accessed 2021 Feb 26]. https://data.canadensys.net/vascan/taxon/2711.
- Coffin AW. 2007. From roadkill to road ecology: a review of the ecological effects of roads. J Transp Geogr. 15(5):396–406. doi:https://doi.org/10.1016/j.jtrangeo.2006.11.006.
- COSEWIC. 2010. COSEWIC assessment and status report on the Monarch Danaus plexippus in Canada. Ottawa (ON): Committee on the Status of Endangered Wildlife in Canada; vii + 43 pp.
- COSEWIC. 2016. COSEWIC assessment and status report on the Monarch Danaus plexippus in Canada. Ottawa (ON): Committee on the Status of Endangered Wildlife in Canada; xiii + 59 pp.
- Daniels J, Kimmel C, McClung S, Epstein S, Bremer J, Rossetti K. 2018. Better understanding the potential importance of Florida roadside breeding habitat for the monarch. Insects. 9(4):137. doi:https://doi.org/10.3390/insects9040137.
- Dee JR, Adams HD, Palmer MW. 2018. Belowground annual ring growth coordinates with aboveground phenology and timing of carbon storage in two tallgrass prairie forb species. Am J Bot. 105(12):1975–1985. doi:https://doi.org/10.1002/ajb2.1198.
- Dee JR, Baum KA. 2019. Mowing frequency influences number of flowering stems but not population age structure of Asclepias viridis, an important monarch host plant. Am Midl Nat. 182(1):35. doi:https://doi.org/10.1674/0003-0031-182.1.27.
- Evetts LL, Burnside OC. 1972. Germination and seedling development of common milkweed and other species. Weed Sci. 20(4):371–378. doi:https://doi.org/10.1017/S004317450003589X.
- Evetts LL, Burnside OC. 1975. Effect of early competition on growth of common milkweed. Weed Sci. 23(1):1–3. doi:https://doi.org/10.1017/S0043174500062391.
- Fischer SJ, Williams EH, Brower LP, Palmiotto PA. 2015. Enhancing monarch butterfly reproduction by mowing fields of common milkweed. Am Midl Nat. 173(2):229–240. doi:https://doi.org/10.1674/amid-173-02-229-240.1.
- Flockhart DTT, Pichancourt JB, Norris DR, Martin TG. 2015. Unravelling the annual cycle in a migratory animal: breeding-season habitat loss drives population declines of monarch butterflies. J Anim Ecol. 84(1):155–165. doi:https://doi.org/10.1111/1365-2656.12253.
- Follak S, Schleicher C, Schwarz M. 2018. Roads support the spread of invasive Asclepias syriaca in Austria. Die Bodenkultur J Land Manag Food Environ. 69(4):257–265. doi:https://doi.org/10.2478/boku-2018-0022.
- Forman RTT, Alexander LE. 1998. Roads and their major ecological effects. Annu Rev Ecol Syst. 29:207–231. doi:https://doi.org/10.1146/annurev.ecolsys.29.1.207.
- Fox G, Wang Y. 2016. An economic analysis of rural land use policies in Ontario. Fraser Institute; [accessed 2021 Feb 27]. https://www.fraserinstitute.org/studies/an-economic-analysis-of-rural-land-use-policies-in-ontario.
- Fox J, Weisberg S. 2019. An R companion to applied regression. 3rd ed. Thousand Oaks (CA): Sage.
- Gleason HA, Cronquist AJ. 1991. Manual of vascular plants of Northeastern United States and adjacent Canada. 2nd ed. Bronx (NY): New York Botanical Garden.
- Government of Canada. 2003. Species profile (Monarch). Species at Risk Public Registry; [accessed 2021 Feb 27]. https://wildlife-species.canada.ca/species-risk-registry/species/speciesDetails_e.cfm?sid=294.
- Groh H, Dore WG. 1945. A milkweed survey in Ontario and adjacent Quebec. Sci Agric. 25(8):463–481.
- Hartig F. 2019. DHARMa: residual diagnostics for hierarchical (multi-level/mixed) regression models. R Package version 0.2.2. [accessed 2021 Feb 27]. https://cran.r-project.org/package=DHARMa.
- Hartzler RG. 2010. Reduction in common milkweed (Asclepias syriaca) occurrence in Iowa cropland from 1999 to 2009. Crop Prot. 29(12):1542–1544. doi:https://doi.org/10.1016/j.cropro.2010.07.018.
- Hartzler RG, Buhler DD. 2000. Occurrence of common milkweed (Asclepias syriaca) in cropland and adjacent areas. Crop Prot. 19(5):363–366. doi:https://doi.org/10.1016/S0261-2194(00)00024-7.
- Hopwood J. 2010. Invertebrate conservation guidelines – pollinators and roadsides: managing roadsides for bees and butterflies. Portland (OR): The Xerces Society for Invertebrate Conservation. [accessed 2021 Feb 27]. https://www.linncounty.org/DocumentCenter/View/58/Managing-Roadsides-for-Bees-and-Butterflies-PDF.
- James G, Witten D, Hastie T, Tibshirani R. 2017. An introduction to statistical learning. 8th ed. New York (NY): Springer.
- Kantola T, Tracy JL, Baum KA, Quinn MA, Coulson RN. 2019. Spatial risk assessment of eastern monarch butterfly road mortality during autumn migration within the southern corridor. Biol Conserv. 231:150–160. doi:https://doi.org/10.1016/j.biocon.2019.01.008.
- Kasten K, Stenoien C, Caldwell W, Oberhauser KS. 2016. Can roadside habitat lead monarchs on a route to recovery?. J Insect Conserv. 20(6):1047–1057. doi:https://doi.org/10.1007/s10841-016-9938-y.
- Kaul AD, Wilsey BJ. 2019. Monarch butterfly host plant (milkweed Asclepias spp.) abundance varies by habitat type across 98 prairies. Restor Ecol. 27(6):1274–1281. doi:https://doi.org/10.1111/rec.12993.
- Khalid N, Hussain M, Young HS, Boyce B, Aqeel M, Noman A. 2018. Effects of road proximity on heavy metal concentrations in soils and common roadside plants in Southern California. Environ Sci Pollut Res. 25(35):35257–35265. doi:https://doi.org/10.1007/s11356-018-3218-1.
- Knight SM, Norris DR, Derbyshire R, Flockhart DTT. 2019. Strategic mowing of roadside milkweeds increases monarch butterfly oviposition. Glob Ecol Conserv. 19:e00678. doi:https://doi.org/10.1016/j.gecco.2019.e00678.
- Malcolm SB, Cockrell BJ, Brower LP. 1993. Spring recolonization of eastern North America by the monarch butterfly: successive brood or single sweep migration?. In: Malcolm SD, Zaluchi MP, editors. Biology and conservation of the monarch butterfly. Los Angeles (CA): Natural History Museum of Los Angeles County; p. 253–267.
- Marrs RH, Williams CT, Frost AJ, Plant RA. 1989. Assessment of the effects of herbicide spray drift on a range of plant species of conservation interest. Environ Pollut. 59(1):71–86. doi:https://doi.org/10.1016/0269-7491(89)90022-5.
- McKenna DD, McKenna KM, Malcom SB, Berenbaum MR. 2001. Mortality of lepidoptera along roadways in Central Illinois. J Lepid Soc. 55(2):63–68.
- Mitchell TS, Agnew L, Meyer R, Sikkink KL, Oberhauser KS, Borer ET, Snell-Rood EC. 2020. Traffic influences nutritional quality of roadside plants for monarch caterpillars. Sci Total Environ. 724:138045. doi:https://doi.org/10.1016/j.scitotenv.2020.138045.
- Oberhauser K, Peterson AT. 2003. Modeling current and future potential wintering distributions of eastern North American monarch butterflies. Proc Natl Acad Sci USA. 100(SUPPL.2):14063–14068. doi:https://doi.org/10.1073/pnas.2331584100.
- Olszyk D, Pfleeger T, Lee EH, Plocher M. 2015. Glyphosate and dicamba herbicide tank mixture effects on native plant and non-genetically engineered soybean seedlings. Ecotoxicology. 24(5):1014–1027. doi:https://doi.org/10.1007/s10646-015-1442-8.
- Pitman GM, Flockhart DTT, Norris DR. 2018. Patterns and causes of oviposition in monarch butterflies: implications for milkweed restoration. Biol Conserv. 217:54–65. doi:https://doi.org/10.1016/j.biocon.2017.10.019.
- Pleasants J. 2017. Milkweed restoration in the Midwest for monarch butterfly recovery: estimates of milkweeds lost, milkweeds remaining and milkweeds that must be added to increase the monarch population. Insect Conserv Divers. 10(1):42–53. doi:https://doi.org/10.1111/icad.12198.
- Pleasants JM, Oberhauser KS. 2013. Milkweed loss in agricultural fields because of herbicide use: effect on the monarch butterfly population. Insect Conserv Divers. 6(2):135–144. doi:https://doi.org/10.1111/j.1752-4598.2012.00196.x.
- R Core Team. 2018. R: a language and environment for statistical computing. Vienna (AT): R Foundation for Statistical Computing.
- Ries L, Fletcher RJ, Battin J, Sisk TD. 2004. Ecological responses to habitat edges: mechanisms, models, and variability explained. Annu Rev Ecol Evol Syst. 35:491–522. doi:https://doi.org/10.1146/annurev.ecolsys.35.112202.130148.
- Sacchi CF. 1987. Variability in dispersal ability of common milkweed, Asclepias syriaca, seeds. Oikos. 49(2):198. doi:https://doi.org/10.2307/3566026.
- Semmens BX, Semmens DJ, Thogmartin WE, Wiederholt R, López-Hoffman L, Diffendorfer JE, Pleasants JM, Oberhauser KS, Taylor OR. 2016. Quasi-extinction risk and population targets for the Eastern, migratory population of monarch butterflies (Danaus plexippus). Sci Rep-UK. 6(1):1–7.
- Simard MJ, Benoit DL. 2011. Effect of repetitive mowing on common ragweed (Ambrosia artemisiifolia L.) pollen and seed production. Ann Agr Env Med. 18(1):55–62.
- Snell-Rood EC, Espeset A, Boser CJ, White WA, Smykalski R. 2014. Anthropogenic changes in sodium affect neural and muscle development in butterflies. Proc Natl Acad Sci USA. 111(28):10221–10226. doi:https://doi.org/10.1073/pnas.1323607111.
- Spooner PG, Lunt ID, Briggs SV. 2004. Spatial analysis of anthropogenic disturbance regimes and roadside shrubs in a fragmented agricultural landscape. Appl Veg Sci. 7(1):61. doi:https://doi.org/10.1111/j.1654-109X.2004.tb00596.x.
- Statistics Canada. 2013. Eighth census of Canada,1941. Cat no CS98-1941-PDF. Vol. 2. [accessed 2020 Nov 17]. http://publications.gc.ca/site/eng/9.833108/publication.html.
- Statistics Canada. 2016. The changing landscape of Canadian metropolitan areas - Human activity and the environment 2015. [accessed 2020 Nov 17]. https://www150.statcan.gc.ca/n1/pub/16-509-x/2016001/1427-eng.htm.
- Statistics Canada. 2017. Ontario [Province] and Canada [Country] (table). Census profile. 2016 census. Stat Canada Cat no 98-316-X2016001. [accessed 2020 Nov 17]. https://www12.statcan.gc.ca/census-recensement/2016/dp-pd/prof/index.cfm?Lang=E.
- Taylor D. [date unknown]. Common milkweed (Asclepias syriaca L.). United States Department of Agriculture; [accessed 2020 Nov 17]. https://www.fs.fed.us/wildflowers/plant-of-the-week/asclepias_syriaca.shtml.
- Thogmartin WE, Wiederholt R, Oberhauser K, Drum RG, Diffendorfer JE, Altizer S, Taylor OR, Pleasants J, Semmens D, Semmens B, et al. 2017. Monarch butterfly population decline in North America: identifying the threatening processes. R Soc Open Sci. 4(9):170760. doi:https://doi.org/10.1098/rsos.170760.
- Timmons FL. 2005. A history of weed control in the United States and Canada. Weed Sci. 53(6):748–761. doi:https://doi.org/10.1614/0043-1745(2005)053[0748:AHOWCI]2.0.CO;2.
- Welsh AH, Cunningham RB, Chambers RL. 2000. Methodology for estimating the abundance of rare animals: seabird nesting on North East Herald Cay. Biometrics. 56(1):22–30. doi:https://doi.org/10.1111/j.0006-341X.2000.00022.x.
- Wulfsohn D. 2010. Sampling techniques for plants and soil. Landbauforschung Völkenrode. Special Issue 340:3–30.
- Zalai M, Poczok L, Dorner Z, Körösi K, Pálinkás Z, Szalai M, Pintér O. 2017. Developing control strategies against common milkweed (Asclepias syriaca L.) on ruderal habitats. Herbologia. 16(2):69–84.
- Zalucki MP, Lammers JH. 2010. Dispersal and egg shortfall in monarch butterflies: what happens when the matrix is cleaned up?. Ecol Entomol. 35(1):84–91. doi:https://doi.org/10.1111/j.1365-2311.2009.01160.x.
- Zaya DN, Pearse IS, Spyreas G. 2017. Long-term trends in midwestern milkweed abundances and their relevance to monarch butterfly declines. Bioscience. 67(4):343–356. doi:https://doi.org/10.1093/biosci/biw186.
- Zeileis A, Kleiber C, Jackman S. 2008. Regression models for count data in R. J Stat Softw. 27(8):1–25. doi:https://doi.org/10.18637/jss.v027.i08.
- Zhang Y, Guindon B, Sun K. 2010. Measuring Canadian urban expansion and impacts on work-related travel distance: 1966-2001. J Land Use Sci. 5(3):217–235. doi:https://doi.org/10.1080/1747423X.2010.500684.
- Zhou T, Luo X, Hou Y, Xiang Y, Peng S. 2020. Quantifying the effects of road width on roadside vegetation and soil conditions in forests. Landscape Ecol. 35(1):69–81. doi:https://doi.org/10.1007/s10980-019-00930-8.