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Articles 91 - 96 of 96
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Effects Of Multiple Ecological Drivers On Recruitment And Succession Of Coral Reef Macroalgal Communities, Alain Duran
Effects Of Multiple Ecological Drivers On Recruitment And Succession Of Coral Reef Macroalgal Communities, Alain Duran
FIU Electronic Theses and Dissertations
The study evaluated the effects of herbivory pressure, nutrient availability and potential propagule supply on recruitment and succession of coral reef macroalgal communities. Recruitment and succession tiles were placed in a nutrient-herbivory factorial experiment and macroalgal abundances were evaluated through time. Proportional abundances of macroalgal form-functional groups on recruitment and succession tiles were similar to field established communities within treatments, evidencing possible effects of adult macroalgae as propagule supply. Macroalgal abundance of recruitment tiles increased with nutrient loading and herbivory reduction combined whereas on succession tiles nutrient loading increased abundance of articulated-calcareous only when herbivores were excluded. Macroalgal field established …
Root:Shoot Ratio And Specific Leaf Area Along An Elevational Gradient In The Peruvian Andes, Catherine Heidy Bravo Avila
Root:Shoot Ratio And Specific Leaf Area Along An Elevational Gradient In The Peruvian Andes, Catherine Heidy Bravo Avila
FIU Electronic Theses and Dissertations
Andean montane forests are one of the most diverse ecosystems on Earth, but are also highly vulnerable to climate change. Therefore, the link between plant distribution and ecosystem productivity is a critical point to investigate in these ecosystems. Are the patterns in productivity observed in montane forest due to species turnover along the elevational gradients? Methodological constraints keep this question unanswered. Also, despite their importance, belowground biomass remains poorly quantified and understood. I measured two plant functional traits in seedlings, root:shoot ratio and specific leaf area, to identify different strategies in growth and biomass allocation across elevations. A tradeoff in …
The Interactive Effects Of Predators, Resources, And Disturbance On Freshwater Snail Populations From The Everglades, Clifton B. Ruehl
The Interactive Effects Of Predators, Resources, And Disturbance On Freshwater Snail Populations From The Everglades, Clifton B. Ruehl
FIU Electronic Theses and Dissertations
The origins of population dynamics depend on interplay between abiotic and biotic factors; the relative importance of each changing across space and time. Predation is a central feature of ecological communities that removes individuals (consumption) and alters prey traits (non-consumptive). Resource quality mitigates non-consumptive predator effects by stimulating growth and reproduction. Disturbance resets predator-prey interactions by removing both. I integrate experiments, time-series analysis, and performance trials to examine the relative importance of these on the population dynamics of a snail species by studying a variety of their traits. A review of ninety-three published articles revealed that snail abundance was much …
Seed Dispersal And Reproduction Patterns Among Everglades Plants, Ronald E. Mossman
Seed Dispersal And Reproduction Patterns Among Everglades Plants, Ronald E. Mossman
FIU Electronic Theses and Dissertations
In this study three aspects of sexual reproduction in Everglades plants were examined to more clearly understand seed dispersal and the allocation of resources to sexual reproduction— spatial dispersal process, temporal dispersal of seeds (seedbank), and germination patterns in the dominant species, sawgrass (Cladium jamaicense). Community assembly rules for fruit dispersal were deduced by analysis of functional traits associated with this process. Seedbank ecology was investigated by monitoring emergence of germinants from sawgrass soil samples held under varying water depths to determine the fate of dispersed seeds. Fine-scale study of sawgrass fruits yielded information on contributions to variation in sexually …
The Effect Of Male-Male Competition And Its Underlying Regulatory Mechanisms On The Electric Signal Of The Gymnotiform Fish Brachyhypopomus Gauderio, Vielka Lineth Salazar
The Effect Of Male-Male Competition And Its Underlying Regulatory Mechanisms On The Electric Signal Of The Gymnotiform Fish Brachyhypopomus Gauderio, Vielka Lineth Salazar
FIU Electronic Theses and Dissertations
Sexually-selected communication signals can be used by competing males to settle contests without incurring the costs of fighting. The ability to dynamically regulate the signal in a context-dependent manner can further minimize the costs of male aggressive interactions. Such is the case in the gymnotiform fish Brachyhypopomus gauderio, which, by coupling its electric organ discharge (EOD) waveform to endocrine systems with circadian, seasonal, and behavioral drivers, can regulate its signal to derive the greatest reproductive benefit. My dissertation research examined the functional role of the EOD plasticity observed in male B. gauderio and the physiological mechanisms that regulate the enhanced …
Life History And Reproductive Ecology Of Sistrurus Miliarius Barbouri : The Dusky Pygmy Rattlesnake In Long Pine Key, Everglades National Park, Teresa C. Defrancesco
Life History And Reproductive Ecology Of Sistrurus Miliarius Barbouri : The Dusky Pygmy Rattlesnake In Long Pine Key, Everglades National Park, Teresa C. Defrancesco
FIU Electronic Theses and Dissertations
The life history and reproductive ecology of the pygmy rattlesnake, Sistrurus miliarius barbouri was studied from January, 1984 to June, 1987 at Long Pine Key, Everglades national Park. This sample exhibits no sexual dimorphism except for relative to hail lengths; mean adult size was about 47 cms. Females do however comprise the majority of the snakes over 50 cms. S.m. barbouri show no habitat preference between the four habitat types. They are active year-round theater clearly second half of the year snakes. The species activity peak is in October which marks the end of the wet season and the climax …