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Full-Text Articles in Life Sciences
Tb147: Simulating The Development Of Mexican Bean Beetle Immature Stages, Epilachna Varivestis Mulsant (Coleoptera: Coccinellidae), On Dry Beans, Yuqing Fan, Francis A. Drummond, Eleanor Groden
Tb147: Simulating The Development Of Mexican Bean Beetle Immature Stages, Epilachna Varivestis Mulsant (Coleoptera: Coccinellidae), On Dry Beans, Yuqing Fan, Francis A. Drummond, Eleanor Groden
Technical Bulletins
A computer model was developed to simulate and predict the phenology of Mexican bean beetle (MBB), Epilachna varivestis Mulsant, populations on dry beans, Phaseolus vulgaris. Time-varying distributed developmental rates of the egg, four larval instars, and pupal stages were simulated with degree day models, based on a standardized cumulative probability distribution function from a range of constant temperature experiments. Predictions from the simulation model provided a good fit to the observed constant temperature data and field experiments. Using temperature data in the form of daily maximums and minimums, the model can be used to predict the occurrence of immature MBB …
Tb146: The Eccentric Bogs Of Maine: A Rare Wetland Type In The United States, Ronald B. Davis, Dennis S. Anderson
Tb146: The Eccentric Bogs Of Maine: A Rare Wetland Type In The United States, Ronald B. Davis, Dennis S. Anderson
Technical Bulletins
The specific objectives of this project were to (1) map the distribution in Maine of eccentric bogs; (2) map the surface physical features and vegetation of a large sample of Maine's eccentric bogs; (3) determine for these bogs the vascular plant, bryophyte, and lichen flora; types and structure of vegetation; peat interstitial water chemistry; relationships between vegetation-flora and water chemistry; subsurface features relating to origins and development; and (4) evaluate the bogs for their unique and exemplary characteristics an d recommend certain of them to the Maine Critica l Areas Program for designation as Critical Areas.
Tb142: Mayflies Of Maine: An Annotated Faunal List, Steven K. Burian, K. Elizabeth Gibbs
Tb142: Mayflies Of Maine: An Annotated Faunal List, Steven K. Burian, K. Elizabeth Gibbs
Technical Bulletins
The purpose of this study is to determine the composition and distribution of the mayfly fauna and to reference all pertinent taxonomic, ecologic, and biologic data.
Tb139: Stand Age And Density Effects On Volume And Specific Gravity Of Black Spruce, Robert K. Shepard, James E. Shottafer, William C. Bragg
Tb139: Stand Age And Density Effects On Volume And Specific Gravity Of Black Spruce, Robert K. Shepard, James E. Shottafer, William C. Bragg
Technical Bulletins
Ten dominant or codominant trees were sampled from a 29-year-old black spruce stand, released at age 19, and ten of comparable dbh from a 77-year-old, unthinned stand. A variety of characteristics, including taper, volume, and specific gravity of the bole, as well as the change in specific gravity with age at breast height, were determined for trees from both stands. The older trees had significantly less taper, shorter crowns, approximately 1.9 times more merchantable volume and 10% higher specific gravity. The juvenile period for specific gravity was approximately 60 years. The higher specific gravity and merchantable volume of the older …
Tb143: Reproductive Phenologies Of Selected Flowering Plants In Eastern Maine Forests, R. W. Hansen, S. B. Hansen, E. A. Osgood
Tb143: Reproductive Phenologies Of Selected Flowering Plants In Eastern Maine Forests, R. W. Hansen, S. B. Hansen, E. A. Osgood
Technical Bulletins
This technical bulletin documents both flowering and fruiting patterns during the spring and summer of 1982 of plant species found in eastern Maine forests.