scholarly journals A metapopulation approach to Pitcher's thistle (Cirsium pitcheri) recovery in southern Lake Michigan dunes

1994 ◽  
pp. 194-218 ◽  
Author(s):  
A. Kathryn McEachern ◽  
Marlin L. Bowles ◽  
Noel B. Pavlovic
Keyword(s):  
Lake Michigan ◽  
Cirsium Pitcheri ◽  
Pitcher's Thistle

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.

Effects of invasive knapweed (Centaurea stoebe subsp. micranthos) on a threatened native thistle (Cirsium pitcheri) vary with environment and life stage

Botany ◽  
2015 ◽  
Vol 93 (9) ◽  
pp. 543-558 ◽  
Author(s):  
Tatyana A. Rand ◽  
Svata M. Louda ◽  
Kate M. Bradley ◽  
Kimberly K. Crider
Keyword(s):  
Invasive Plant ◽  
Lake Michigan ◽  
Life Stage ◽  
Seedling Emergence ◽  
Native Plant ◽  
Endemic Plant ◽  
Centaurea Stoebe ◽  
Seed Addition ◽  
Negative Effect ◽  
Cirsium Pitcheri

We examined the type and magnitude of invasive plant (Centaurea stoebe subsp. micranthos (Gugler) Hayek) effects on the demographic parameters of a rare plant (Cirsium pitcheri Torr. & A.Gray), using two seed addition experiments with three treatments in two dune habitats — lakeshore linear dunes and high perched dunes on Lake Michigan, USA. Treatments were near Centaurea stoebe subsp. micranthos, near a native plant, or in the open. Seedling emergence, establishment, and juvenile survivorship were significantly higher on perched dunes, with higher surface soil moisture, than on lakeshore dunes. Treatment effects varied significantly with habitat and life stage. Seedling establishment decreased near Centaurea stoebe subsp. micranthos on lakeshore dunes, but increased near any neighbor on perched dunes. However, juvenile survival was significantly lower near Centaurea stoebe. subsp. micranthos in both habitats. The probability of reaching the adult flowering stage was much lower, and occurred later, for plants near Centaurea stoebe subsp. micranthos, especially on lakeshore dunes. Thus, Centaurea stoebe subsp. micranthos had a strong negative effect on establishment, survival, and flowering of Cirsium pitcheri, but interaction intensity varied with habitat and life stage. The results suggest that coupling seed addition with watering and invasive plant removal could bolster populations of this rare endemic plant.

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.

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

Ultrastructure of Melosira resting cell rejuvenation

1984 ◽  
Vol 42 ◽  
pp. 734-735
Author(s):  
C. E. M. Bourne ◽  
L. Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Lake Michigan ◽  
Light And Electron Microscopy ◽  
Resting Cells ◽  
Planktonic Diatoms ◽  
Resting Cell ◽  
Vegetative Survival ◽  
Cytological Changes ◽  
Recent Attention ◽  
Freshwater Diatom

Much recent attention has been focused on vegetative survival forms of planktonic diatoms and other algae. There are several reports of extended vegetative survival of the freshwater diatom Melosira in lake sediments. In contrast to those diatoms which form a morphologically distinct resistant spore, Melosira is known to produce physiological resting cells that are indistinguishable in outward morphology from actively growing cells.We used both light and electron microscopy to document and elucidate the sequence of cytological changes during the transition from resting cells to actively growing cells in a population of Melosira granulata from Douglas Lake, Michigan sediments collected in mid-July of 1983.

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