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Species Pairwise Associations Over Nine Years Of Secondary Succession: Assessing Alternative Explanations And Successional Mechanisms, Lara R. Rozzell
Species Pairwise Associations Over Nine Years Of Secondary Succession: Assessing Alternative Explanations And Successional Mechanisms, Lara R. Rozzell
All Graduate Theses and Dissertations, Spring 1920 to Summer 2023
The importance and mechanisms of species interactions are undetermined in most successional systems. I used correlations and null modeling to detect pairwise species associations between 33 plant species in the first nine years of secondary succession after logging and burning in a western Oregon Cascade forest. I tested for correlations between each species and soil nutrients, nonvegetative ground cover, and surrounding vegetation. More positive than negative associations were found at all sampling times. The proportion of positive associations decreased and negative associations increased through time. Up to 42% of associations at a sampling time were explicable by shared positive correlations …
The Ecology Of New World Rodent Borne Hemorrhagic Fevers, Darin S. Carroll, Emily Jentes, James N. Mills
The Ecology Of New World Rodent Borne Hemorrhagic Fevers, Darin S. Carroll, Emily Jentes, James N. Mills
Wildlife Damage Management Conference
Few, if any, human settlements are free of peridomestic rodent populations. The threat of rodent borne zoonotic diseases has been widely recognized since the bubonic plague outbreaks of the Middle Ages. In the last decades, outbreaks of human disease caused by the rodent borne hemorrhagic fever viruses, the arenaviruses (family Arenaviridae), and the hantaviruses (family Bunyaviridae, genus Hantavirus) have again generated interest in the general public and scientific community regarding the biology of these types of diseases. Recent studies have identified more than 30 new members of these two groups of viruses. Most are associated with rodents in the family …
Effects Of The Frog Eleutherodactylus Coqui On Invertebrates And Ecosystem Processes At Two Scales In The Luquillo Experimental Forest, Puerto Rico, Karen H. Beard
Karen H. Beard
Determining the ubiquity of top-down control effects of predators on their prey and ecosystem processes is important for understanding community and ecosystem-level consequences that may result from predator loss. We conducted experiments at two spatial scales to investigate the effects of terrestrial frogs (Eleutherodactylus coqui) on aerial and litter invertebrates, plant growth and herbivory, and litter decomposition. At both scales, frogs reduced aerial invertebrates and leaf herbivory, but had no effect on litter invertebrates. At the smaller scale, frogs increased foliage production rates, measured as the number of new leaves and new leaf area produced, by 80% and decomposition rates …
Quantitative Assessment Of Habitat Preferences For The Puerto Rican Terrestrial Frog, Eleutherdoctylus Coqui, Karen H. Beard, S. Mccullough, A. K. Eschtruth
Quantitative Assessment Of Habitat Preferences For The Puerto Rican Terrestrial Frog, Eleutherdoctylus Coqui, Karen H. Beard, S. Mccullough, A. K. Eschtruth
Wildland Resources Faculty Publications
We conducted a quantitative analysis of adult and juvenile Eleutherodactylus coqui (coquí) habitat preferences in Puerto Rico. The analysis consisted of two surveys: one to quantify potential habitat and another to quantify habitat use. Coquís were found to use most habitats available to them; however, adults and juveniles preferred different plant species, habitat structural components, and heights from the forest floor. Adult and juvenile coquís had opposite associations with many important plant species in the forest (e.g., Prestoea montana and Heliconia carabea) and habitat structural components. Adults had a negative association with leaves and a positive association with leaf litter. …