Advanced search options

Advanced Search Options 🞨

Browse by author name (“Author name starts with…”).

Find ETDs with:

in
/  
in
/  
in
/  
in

Written in Published in Earliest date Latest date

Sorted by

Results per page:

You searched for id:"oai:etd.ohiolink.edu:bgsu1510839367571419". One record found.

Search Limiters

Last 2 Years | English Only

No search limiters apply to these results.

▼ Search Limiters


Bowling Green State University

1. Nichter, Ashlee N. Population dynamics of hybrid ecosystems: Implications for marginal ecosystem conservation and management.

Degree: MS, Geology, 2017, Bowling Green State University

Many natural ecosystems are in decline due to anthropogenic disturbance and conversion for human development. Conservation efforts have focused on reserves as the primary location for conservation of native diversity however they are fragmented and embedded in a matrix of potentially inhospitable landscape features. Native ecosystems can also be found in marginal ecosystems, such as riparian buffers, ditches, and field margins, but have been overlooked as contributors to native diversity because thy are small and highly invaded. For my thesis I evaluated the conservation value of marginal ecosystems to support plant diversity compared to reserve areas. I used the point-intercept method to identify species presence along two 10 meter transects in 58 ditches and 26 reserves in northwest Ohio. I characterized diversity with 3 indices: species richness, Shannon diversity index, and rarity weighted richness. I used a Hotelling’s <i>t</i>-test to compare diversity between ditches and reserves. I evaluated local and regional land use using a modified Daubenmire frame, the National Land Cover Database, and the National Agricultural Statistics Service’s Cropland dataset to calculate cropland variation from 2006-2015. I used Geographically Weighted Regressions and linear regressions to assess the influence of local and regional land use on plant diversity and milkweed (<i>Asclepias</i> spp.) distribution. I found that ditches are similar to reserves in maintaining native diversity and contain native species exclusively found in ditches. Secondly, I found diversity is more influenced by local factors and, despite being different landscape contexts, there is no spatial pattern to diversity. Lastly, I found more area of high quality milkweed habitat exists in ditches than reserves. While there are many native species found in reserves, ditches are also highly invaded and ditches can be thought of as hybrid ecosystems. Although ditches are highly invaded, they are an extensive, highly interconnect network on the landscape; and therefore, represent a larger area on the landscape than reserves. Because of this, reserve design should broaden to include ditches in order to encompass complete regional diversity. Each of the chapters in this thesis are written as standalone papers and should be read independently. Advisors/Committee Members: Gregory, Andrew (Advisor).

Subjects/Keywords: Biology; Biostatistics; Botany; Conservation; Ecology; Environmental Science; Geomorphology; Geology; Land Use Planning; Plant Biology; Quantum Physics; Wildlife Conservation; agroecology; conservation; dark diversity; ditches; geobotany; hybrid ecosystems; landscape ecology; marginal ecosystems; novel ecosystems; Ohio; quantum mechanics; vegetation diversity

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nichter, A. N. (2017). Population dynamics of hybrid ecosystems: Implications for marginal ecosystem conservation and management. (Masters Thesis). Bowling Green State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510839367571419

Chicago Manual of Style (16th Edition):

Nichter, Ashlee N. “Population dynamics of hybrid ecosystems: Implications for marginal ecosystem conservation and management.” 2017. Masters Thesis, Bowling Green State University. Accessed December 14, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510839367571419.

MLA Handbook (7th Edition):

Nichter, Ashlee N. “Population dynamics of hybrid ecosystems: Implications for marginal ecosystem conservation and management.” 2017. Web. 14 Dec 2017.

Vancouver:

Nichter AN. Population dynamics of hybrid ecosystems: Implications for marginal ecosystem conservation and management. [Internet] [Masters thesis]. Bowling Green State University; 2017. [cited 2017 Dec 14]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510839367571419.

Council of Science Editors:

Nichter AN. Population dynamics of hybrid ecosystems: Implications for marginal ecosystem conservation and management. [Masters Thesis]. Bowling Green State University; 2017. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1510839367571419

.