Effects of a non-native biocontrol weevil, Larinus planus, and other emerging threats on populations of the federally threatened Pitcher’s thistle, Cirsium pitcheri

2012 ◽  
Vol 155 ◽  
pp. 202-211 ◽  
Author(s):  
Kayri Havens ◽  
Claudia L. Jolls ◽  
Julie E. Marik ◽  
Pati Vitt ◽  
A. Kathryn McEachern ◽  
...  
Keyword(s):  
Federally Threatened ◽  
Cirsium Pitcheri ◽  
Pitcher's Thistle ◽  
Larinus Planus

Conservation genetics of Pitcher’s thistle (Cirsium pitcheri), an endangered Great Lakes endemic

Botany ◽  
2010 ◽  
Vol 88 (3) ◽  
pp. 250-257 ◽  
Author(s):  
Martha Gauthier ◽  
Emily Crowe ◽  
Lindsey Hawke ◽  
Neil Emery ◽  
Paul Wilson ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Great Lakes ◽  
Genetic Data ◽  
Nuclear Data ◽  
Population Connectivity ◽  
Chloroplast Microsatellite ◽  
Management Plans ◽  
Low Levels ◽  
Cirsium Pitcheri ◽  
Pitcher's Thistle

Pitcher's thistle ( Cirsium pitcheri Torr. ex Eaton (Torr. & Gray)) is a Great Lakes endemic that in Canada is designated as threatened at both the provincial (Ontario) and national levels. Management plans will benefit from conservation genetic data, which can provide insight into population genetic diversity and differentiation. We obtained genetic data from nuclear and chloroplast microsatellite markers from 17 populations of C. pitcheri around the Great Lakes. The nuclear data revealed overall low levels of diversity, high levels of inbreeding, and low levels of population connectivity. The chloroplast data identified a single haplotype, which is consistent with reduced genetic diversity following postglacial colonization. The high levels of inbreeding within populations will likely pose a serious threat to populations in the short term; these have resulted from a combination of low connectivity between populations, and small and fluctuating population sizes. Future management of C. pitcheri populations should consider human-mediated dispersal of plants or seeds among sites.

Population ecology of Cirsium pitcheri on Lake Huron sand dunes I. Impact of white-tailed deer

1996 ◽  
Vol 74 (9) ◽  
pp. 1439-1444 ◽  
Author(s):  
Tracy Phillips ◽  
M. A. Maun
Keyword(s):  
Sand Dunes ◽  
Dry Weight ◽  
The United States ◽  
Tissue Loss ◽  
Growth And Survival ◽  
Good Ability ◽  
Monocarpic Perennial ◽  
Cirsium Pitcheri ◽  
Pitcher's Thistle ◽  
Flowering Ability

Cirsium pitcheri is a monocarpic perennial endemic to the shorelines of the Great Lakes, primarily Lakes Huron and Michigan. Its populations are being reduced by anthropogenic impact and deer grazing throughout much of its range. Several of its once abundant populations at some locations have been extirpated. The species is listed as threatened and endangered in Canada and the United States, respectively. Greenhouse studies were conducted to determine the effects of simulated herbivory by white-tailed deer on the survival, growth, and compensatory ability of plants. We found mat Cirsium pitcheri possessed good ability to compensate for tissue loss. However, simulated intensive browsing resulted in significant reductions in root dry weight. Since the flowering ability of monocarpic perennials such as Cirsium pitcheri is dictated by the amount of stored root reserves, such reductions in root biomass may delay the onset of flowering, reduce overwinter survival, and affect the future growth and survival of this threatened species. Keywords: white-tailed deer, browsing, defoliation, compensation, Cirsium pitcheri, Pitcher's thistle.

Restoration of The Federally Threatened Mead's Milkweed (Asclepias meadii)

2001 ◽  
Vol 19 (4) ◽  
pp. 235-241 ◽  
Author(s):  
Marlin Bowles ◽  
Jenny McBride ◽  
Timothy Bell
Keyword(s):  
Federally Threatened
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