Forest Transitions and Buried Glacial Outwash within the Beech-Maple Region of Michigan, USA

1989 ◽  
Vol 71 (3/4) ◽  
pp. 137
Author(s):  
Sheridan L. Dodge
Keyword(s):  
Glacial Outwash ◽  
Forest Transitions

The relationship of reproductive biology to the rarity of endemic Aster curtus (Asteraceae)

1999 ◽  
Vol 77 (1) ◽  
pp. 140-149 ◽  
Author(s):  
David E Giblin ◽  
Clement W Hamilton
Keyword(s):  
Pacific Northwest ◽  
Reproductive Biology ◽  
Fluorescent Microscopy ◽  
Pollen Grains ◽  
Field Trials ◽  
Rare Plants ◽  
Glacial Outwash ◽  
Compatible Cross ◽  
Species Rarity ◽  
Filled Seeds

The fecundity of rare plants is a commonly used indicator of performance at the population or species level. However, accurately interpreting reproductive output requires an understanding of a particular species's breeding system. The purpose of this study was to determine if reproductive biology contributes to the restricted distribution of Aster curtus Cronq. We hypothesized that (i) A. curtus, like many Asteraceae species, is self-incompatible, and (ii) that pollinations between patches produce significantly more filled seeds than pollinations within patches. Fluorescent microscopy of pistils harvested after greenhouse pollination showed A. curtus to be partially self-compatible. Cross-pollination resulted in significantly more pollen grains per stigma and significantly greater pollen germination than self-pollination. Similarly, field pollination trials showed that between-patch crosses produced significantly more filled seeds than within-patch crosses. Nevertheless, within-patch pollinations produced substantial levels of filled seed. Results from the greenhouse and field trials suggest that the reproductive biology of A. curtus contributes little to its rarity. Understanding why A. curtus is rare has important implications to the conservation of the glacial outwash prairie. Moreover, the data from this research can be used in further developing predictive models for plant species rarity based on reproductive biology.Key words: Aster, endemic, Pacific Northwest, rarity, reproductive biology, self-incompatibility.

scholarly journals Geology and Aquifer Sensitivity of Quaternary Glacial Deposits Overlying a Portion of the Mahomet Buried Bedrock Valley Aquifer System

Hydrology ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 69
Author(s):  
Andrew Watson ◽  
Eric W. Peterson ◽  
Dave Malone ◽  
Lisa Tranel
Keyword(s):  
Land Surface ◽  
Late Quaternary ◽  
Geologic Mapping ◽  
Quaternary Deposits ◽  
Aquifer System ◽  
Geologic Materials ◽  
Lithostratigraphic Units ◽  
Glacial Outwash ◽  
Aquifer Sensitivity ◽  
Geologic Data

To characterize the distribution of Holocene and Late Quaternary deposits and to assess the contamination potential of the Mahomet Aquifer, surficial geologic and aquifer sensitivity maps of the Gibson City East 7.5-Minute Quadrangle were created. Geologic data, extent, and thickness of the geologic materials were coupled with LiDAR topographic data and analyzed using ESRI’s ArcGIS 10.6.1. Aquifer sensitivity to contamination was calculated based on the depth to the first aquifer unit, aquifer thickness, and the lithology of the aquifer materials. The surficial geologic mapping identified five lithostratigraphic units: the Cahokia Formation, the Equality Formation, the Henry Formation, and the Yorkville and Batestown Members of the Lemont Formation. The southeast to northwest trending Illiana Morainic System is the most prominent feature in the study area and delineates the maximum extent of the glaciers during the Livingston Phase of glaciation. Postglacial deposits of the Cahokia Formation, alluvium, interfinger, and overlie with glacial outwash of the Henry Formation along channels and drainage ways downslope of the moraine. The areas of least sensitivity are located over the Illiana Morainic System, whereas the greatest potential to contamination occurs where the thickest deposits of the Henry Formation and Cahokia Formation lie at or just below the land surface.

Phylogenetic relationships in two African Cedreloideae tree genera (Meliaceae) reveal multiple rain/dry forest transitions

2019 ◽  
Vol 37 ◽  
pp. 1-10 ◽  
Author(s):  
Franck K. Monthe ◽  
Jérémy Migliore ◽  
Jérôme Duminil ◽  
Gaël Bouka ◽  
Boris B. Demenou ◽  
...  
Keyword(s):  
Phylogenetic Relationships ◽  
Dry Forest ◽  
Forest Transitions

Temporal shifts in butterfly diversity: responses to natural and anthropic forest transitions

2019 ◽  
Vol 24 (2) ◽  
pp. 353-363
Author(s):  
G. M. Lourenço ◽  
P. Luna ◽  
R. Guevara ◽  
W. Dáttilo ◽  
A. V. L. Freitas ◽  
...  
Keyword(s):  
Butterfly Diversity ◽  
Forest Transitions ◽  
Temporal Shifts
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