35 resultados para succession and diversity


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Newsletter produced by Iowa Civil Right Commission for the community about the community.

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Many prairie restoration projects are hampered by a lack of knowledge on how to restore the high diversity found in prairies, while at the same time preventing the establishment of a large weedy component. Methods are needed to increase diversity and abundance of native species while minimizing exotic species invasions in both 1) newly planted restorations and 2) established restorations. We established an experiment in Story and Monona counties in 2005 to determine the effects of different native cover crop species and timing of seeding on the establishment of new prairie restorations. We found that adding a 30-species prairie mix in early spring led to diverse native communities, but adding the mix in the late summer or the following year after cover crops established led to low diversity communities dominated by exotics. The identity of cover crops affected communities less than timing of seed additions. A second seed addition added to ash after a spring fire in the seventh year (Monona County site) increased recruitment from the prairie mix slightly, but the increase was not enough to cause convergence in the treatments. Surprisingly, the second seed addition increased diversity only in communities that were already the most diverse (i.e., in plots seeded with the prairie mix in early spring before cover crops established). These results imply that 1) cover crops are not effective for establishing prairie and 2) over seeding into established plots may not be an easy and efficient way to increase native recruitment and lower weedy species abundances. Therefore, focusing on establishing high levels of recruitment and diversity and excluding weedy species during the critical time early in establishment should be a priority for new projects.

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Newsletter produced by the Iowa Civil Rights Commission

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Newsletter produced by the Iowa Civil Rights Commission

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Newsletter produced by the Iowa Civil Rights Commission

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Newsletter produced by the Iowa Civil Rights Commission

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Newsletter produced by the Iowa Civil Rights Commission

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Newsletter produced by the Iowa Civil Rights Commission

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Newsletter produced by the Iowa Civil Rights Commission

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Booklet produced by the Iowa Civil Rights Commission

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Booklet produced by the Iowa Civil Rights Commission

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Booklet produced by the Iowa Civil Rights Commission

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Booklet produced by the Iowa Civil Rights Commission for individuals who own, design, build, or develop multi-family housing.

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In accordance with 19B.5 of the Code of Iowa, the 2005 Affirmative Action in Iowa report illustrates the progress made during fiscal year 2005 to balance the State's worforce, the challenges that the State must address and the effort that the Department of Administratie Services must lead in order to remove barriers that limit the hiring, retention and advancement of females, minorities and persons with disabilities in the State's workforce. Highlighted in the report are four departments that initiated proactive and innovative measures to address their workplace equal opportunity, affirmative action and diversity programs. Additionally, the Department of Administrative Services-Human Resources Enterprise outlines its plan to build on its past efforts as well as pursue new initiatives to partner with advocacy groups and reach out to the commuity more directely to enhance employment opportunities for females, minorities and persons with disabilities in State of Iowa employment.

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In accordance with 19B.5 of the Code of Iowa, the 2005 Affirmative Action in Iowa report illustrates the progress made during fiscal year 2005 to balance the State's worforce, the challenges that the State must address and the effort that the Department of Administratie Services must lead in order to remove barriers that limit the hiring, retention and advancement of females, minorities and persons with disabilities in the State's workforce. Highlighted in the report are four departments that initiated proactive and innovative measures to address their workplace equal opportunity, affirmative action and diversity programs. Additionally, the Department of Administrative Services-Human Resources Enterprise outlines its plan to build on its past efforts as well as pursue new initiatives to partner with advocacy groups and reach out to the commuity more directely to enhance employment opportunities for females, minorities and persons with disabilities in State of Iowa employment.