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Full-Text Articles in Life Sciences

Investigation Of Seed And Seedling Predation And Natural History Of Bushveld Savanna Rodents, Christopher Banotai Oct 2017

Investigation Of Seed And Seedling Predation And Natural History Of Bushveld Savanna Rodents, Christopher Banotai

Masters Theses & Specialist Projects

There is currently a decline in large, old trees within many ecosystems where they play important ecological and economic roles. One ecosystem suffering from this decline is the bushveld savanna of South Africa. One particularly important species in decline is the ecologically, economically, and culturally significant marula tree (Sclerocarya birrea subsp. caffra). This species’ decline is characterized by a steep drop in recruitment of seedlings into the population. Rodents are known to influence plant communities across many ecosystems through herbivory of adult plants as well as predation of seeds and seedlings. This research provides a record of rodent species present …


Examining Movement And Habitat Selection Of Everglades Fishes In Response To Seasonal Water Levels, Gregory J. Hill Mar 2017

Examining Movement And Habitat Selection Of Everglades Fishes In Response To Seasonal Water Levels, Gregory J. Hill

FIU Electronic Theses and Dissertations

Fish distribution patterns and seasonal habitat use play a key role in the food web dynamics of aquatic ecosystems, including the Florida Everglades. In this study I examined the fine scale habitat shifts and movements of spotted sunfish, Lepomis punctatus across varying seasons and hydrologic conditions using in-situ field enclosures and Passive Integrated Transponder (PIT) systems. Data on fish use of three dominant Everglades marsh habitats and activity level were recorded continuously from January to August, 2015. Fish were more active and had the highest use of higher elevation habitats when water levels rose during an experimental reversal in mid-April. …


Stopped In Their Tracks: Assessing The Effects Of Anthropogenic Barriers On Gopherus Polyphemmus, Bridget Vincent, Katelyn S. Lanctot, Rhett M. Rautsaw, Scott A. Martin, M. Rebecca Bolt, Richard A. Siegel Jan 2017

Stopped In Their Tracks: Assessing The Effects Of Anthropogenic Barriers On Gopherus Polyphemmus, Bridget Vincent, Katelyn S. Lanctot, Rhett M. Rautsaw, Scott A. Martin, M. Rebecca Bolt, Richard A. Siegel

Bridget Vincent

Roads are known to hinder gene flow and fragment habitat for terrestrial organisms, including Gopher Tortoises (Gopherus polyphemus). However, railroad tracks may cause similar problems as tortoises often become trapped in the tracks and face mortality from overheating and dehydration. To test the effect railroad tracks have on Gopher Tortoises, 12 adult tortoises familiar with the tracks and 12 unfamiliar with the tracks were placed in a 20 meter stretch of inactive track at the Kennedy Space Center. Additionally, 12 tortoises were placed in a control area of equal size. Behavior and crossing attempts were recorded for one …