Atlas of the rare vascular plants of Ontario

Argus, George W.

doi:10.5962/bhl.title.51429

Cited by 30 publications

(74 citation statements)

References 12 publications

(18 reference statements)

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“…gonquin, and the flora has affinities to the Atlantic coastal plain of eastern North America. The open sandy shores of Axe Lake support species such as: Rhexia virginica, Xyris caroliniana, ]uncus militaris, Nymphoides cordata, Muhlenbergia uniflora, and Rhynchospora capitellata, which are considered rare in Ontario (Argus and White 1977). These and other species are largely restricted to the Georgian Bay area of Ontario (Keddy and Reznicek 1982), with other disjunct concentrations on the southern end of Lake Michigan (Peattie 1922) and the sand barrens of northwestern Wisconsin (McLaughlin 1932).…”

Section: Description Of Study Areamentioning

confidence: 99%

Shoreline Vegetation in Axe Lake, Ontario: Effects of Exposure on Zonation Patterns

Keddy

1983

Ecology

252

124

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This ~tudy tests several hypotheses relating community structure to environmental disturbance, by test~ng for changes in the zonation patterns of lakeshore vegetation. Twenty-five transects wer~ e~~mmed at ~ifferent positi~ns along an exposure gradient. The range of water depths tolerated by mdividual spec1es (real1zed mche width) changed with exposure. Some (Lobelia dartmanna, Utricularia cornuta) reached their maximum on exposed shores, others (Drosera intermedia Cladium mariscoides) at i~ter~ediate exposure, and others (Pontederia cordata, Triadenumfraseri) on shelter~d shores. Spec1es nchness peaked significantly at intermediate levels of exposure (P < .0_1). In sp1te of chang~s iJ_J b~th species composition and richness, mean niche width did not change w1th ~xposu:e. The d1stnbutwn of the upper and lower limits of species along the gradient was exam1~ed_ usmg measures of boundary clustering. The lower and upper boundaries of species were b?th s1gmficantly c~ustered (P < .001), suggesting discrete communities exist on the shoreline gradient. As exposure mcreased, upper boundanes became more clustered (P < .002); lower boundaries ~ere u~1affected. The dis~ribut_ion of boundaries shifted landward with increasing exposure. This fact IS possibly related to an identical landward shift in the lower boundaries of shoreline shrubs which appear to have a major influence on the distribution of herbaceous shoreline vegetation. '.

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Section: Description Of Study Areamentioning

confidence: 99%

Shoreline Vegetation in Axe Lake, Ontario: Effects of Exposure on Zonation Patterns

Keddy

1983

Ecology

252

124

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“…As such, they are often the focus of conservation efforts, even though the species they represent may be quite common towards the range centre (Hunter & Hutchinson 1994). For example, about one-third of the rare vascular plants species of Ontario, Canada occur as disjunct populations (Argus et al . 1987) .…”

Section: Introductionmentioning

confidence: 99%

Population genetic consequences of geographic disjunction: a prairie plant isolated on Great Lakes alvars

Hamilton

Eckert

2007

Molecular Ecology

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Species may often exhibit geographic variation in population genetic structure due to contemporary and historical variation in population size and gene flow. Here, we test the predictions that populations on the margins of a species' distribution contain less genetic variation and are more differentiated than populations towards the core of the range by comparing patterns of genetic variation at five microsatellite loci between disjunct and core populations of the perennial, allohexaploid herb Geum triflorum. We sampled nine populations isolated on alvar habitat within the eastern Great Lakes region in North America, habitats that include disjunct populations of several plant species, and compared these to 16 populations sampled from prairie habitat throughout the core of the species' distribution in midwestern Canada and the USA. Alvar populations exhibited much lower within-population diversity and contained only a subset of alleles found in prairie populations. We detected isolation by distance across the species' range and within alvar and prairie regions separately. As predicted, genetic differentiation was higher among alvar populations than among prairie populations, even after controlling for the geographic distance between sampled populations. Low diversity and high differentiation can be accounted for by the greater contemporary spatial isolation of alvar populations. However, the genetic structure of alvar populations may also have been influenced by postglacial range expansion and contraction. Our results are consistent with alvar populations being founded during an expansion of prairie habitat during the warmer, hypsithermal period approximately 5000 bp and subsequently becoming stranded on isolated alvar habitat as the climate grew cooler and wetter.

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“…and the occurrence of at least 12 species on the rare and endangered list for Ontario (indicated in Table 4; Argus and White 1977). The low number of introduced species appears to be a reflection of two factors.…”

Section: Composition Of Walpole Island Prairiesmentioning

confidence: 97%

“…Absence of a value indicates that the species was not prevalent in the type, although it may have been present. An asterisk indicates that the species is on the rare and endangered list for Ontario(Argus and White 1977). DMs, drymesic sandy; Msl, mesic sandy loam; WMsl, wet-mesic sandy loam; Wl, wet loam.…”

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confidence: 99%

Composition and soil–environment analysis of prairies on Walpole Island, southwestern Ontario

Faber-Langendoen¹,

Maycock²

1987

Can. J. Bot.

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1987. Composition and soil-environment analysis of prairies on Walpole Island, southwestern Ontario. Can. J. Bot. 65: 2410-2419.Extensive prairie communities on Walpole Island Indian Reserve in Lake St. Clair, southwestern Ontario, were sampled for vegetation and soil profile characteristics. Two hundred and fifty-two species were found in the 20 stands. Dominant grasses included Calamagrostis canadensis, Andropogon gerardii, Sorghastmrn nutans, Panicum virgatum, Poa pratensis, and Spartina pectinata. Dominant forbs were Pycnanthemum virginianum, Liatris spicata, Fragaria virginiana, Lysirnachia quadriflora, and Viola papilionacea. Stands were ordered along a recognized moisture-substrate gradient divided into four segments; dry-mesic sandy, mesic sandy loam, wet-mesic sandy loam, and wet loam. Many species showed preferences for certain regions of the gradient. Species richness ranged between 44 and 91 species per stand. The composition of the vegetation was summarized for the four segments, using prevalent species lists. Effectiveness of the direct gradient analysis was assessed by ordination using reciprocal averaging and polar ordination. Percent sand, percent organic matter, and depth of A horizon were significant correlates of the primary axis. Frequent burning of the prairie by the Indians has effectively maintained these prairies. The composition of the Walpole Island prairies is similar to those in Michigan, Illinois, and Wisconsin, forming part of the eastern tallgrass prairie.

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Atlas of the rare vascular plants of Ontario

Cited by 30 publications

References 12 publications

Shoreline Vegetation in Axe Lake, Ontario: Effects of Exposure on Zonation Patterns

Shoreline Vegetation in Axe Lake, Ontario: Effects of Exposure on Zonation Patterns

Population genetic consequences of geographic disjunction: a prairie plant isolated on Great Lakes alvars

Composition and soil–environment analysis of prairies on Walpole Island, southwestern Ontario

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