Current Search: Volin, John C. (x)
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- Title
- Does residential landscape type affect nitrogen runoff and leaching?.
- Creator
- Erickson, John Erickson., Florida Atlantic University, Volin, John C.
- Abstract/Description
-
Intensely maintained turfgrass landscapes have some potential for loss of fertilizer nitrogen (N) in both runoff and leaching. Lower maintenance vegetation used in mixed-species landscapes may reduce N leaching and runoff, which is important for reducing environmental pollution of surface and ground waters. However, few studies have examined this paradigm. Therefore, we constructed a field-scale facility to compare fertilizer N runoff and leaching between St. Augustinegrass (Stenotaphrum...
Show moreIntensely maintained turfgrass landscapes have some potential for loss of fertilizer nitrogen (N) in both runoff and leaching. Lower maintenance vegetation used in mixed-species landscapes may reduce N leaching and runoff, which is important for reducing environmental pollution of surface and ground waters. However, few studies have examined this paradigm. Therefore, we constructed a field-scale facility to compare fertilizer N runoff and leaching between St. Augustinegrass (Stenotaphrum secundatum (Walt.) Kuntze cv. 'Floratam') and a mixed-species landscape designed by the Florida Yards and Neighborhoods (FYN) program. A blended granular fertilizer was applied at a rate of 300 and 150 kg N ha-1 yr -1 on the turfgrass and mixed-species, respectively. During the 12-month study only one minor runoff event occurred (<0.2 cm) and N losses were insignificant. Annual N leaching losses were significantly greater on the mixed-species landscape, resulting in 4.80 g N m-2 compared to 0.41 g N m-2 for the St. Augustinegrass.
Show less - Date Issued
- 2000
- PURL
- http://purl.flvc.org/fcla/dt/15761
- Subject Headings
- Nitrogen fertilizers, Grasses--Fertilizers--Florida, Soils--Nitrogen content, Soils--Leaching
- Format
- Document (PDF)
- Title
- Butterfly populations in the Florida Big Cypress Swamp: Can they be used as bioindicators?.
- Creator
- DaCosta, Michelle A., Florida Atlantic University, Volin, John C.
- Abstract/Description
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The need for biological monitoring is increasing in importance as conservation programs are established for natural areas. The primary purpose of this study was to gain basic information on butterfly assemblages that would be useful in developing the use of butterflies as bioindicators. I examined the diversity and seasonal abundance of adult butterflies in seven locations comprising seven habitat types in the Big Cypress Seminole Indian Reservation in southern Florida; two wet meadows, two...
Show moreThe need for biological monitoring is increasing in importance as conservation programs are established for natural areas. The primary purpose of this study was to gain basic information on butterfly assemblages that would be useful in developing the use of butterflies as bioindicators. I examined the diversity and seasonal abundance of adult butterflies in seven locations comprising seven habitat types in the Big Cypress Seminole Indian Reservation in southern Florida; two wet meadows, two pine flatwoods, two ecotones, and a disturbed roadside were studied. One ecotone occurred between a wet meadow and a dry hammock, the other between a pine flatwoods and a wet prairie marsh community. Forty-three butterfly species were found during the one-year study. Several butterfly species were found to be potential indicators in most of the habitats studied. Overall, butterfly diversity did not differ significantly among habitats or between seasons, although seasonal differences in abundance were apparent.
Show less - Date Issued
- 2001
- PURL
- http://purl.flvc.org/fcla/dt/12741
- Subject Headings
- Indicators (Biology)--Florida--Big Cypress Swamp, Butterflies--Florida--Big Cypress Swamp, Biological monitoring--Florida--Big Cypress Swamp
- Format
- Document (PDF)
- Title
- Can rewatering reverse the effects of regional drainage on forest communities of the Big Cypress Swamp?.
- Creator
- Park, Scott Michael T., Florida Atlantic University, Volin, John C.
- Abstract/Description
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The impact of five years of rewatering on a desiccated forested wetland within the Everglades Big Cypress Swamp was investigated. It was found that rewatering generally resulted in a shift in species composition along a hydrological gradient. This was particularly evident in the seedling and herbaceous layer of the cypress domes, the most hydric community studied, where obligate and facultative wetland species had their highest species richness. Overall there were no detectable differences in...
Show moreThe impact of five years of rewatering on a desiccated forested wetland within the Everglades Big Cypress Swamp was investigated. It was found that rewatering generally resulted in a shift in species composition along a hydrological gradient. This was particularly evident in the seedling and herbaceous layer of the cypress domes, the most hydric community studied, where obligate and facultative wetland species had their highest species richness. Overall there were no detectable differences in the number of non-indigenous species in rewatered compared to reference sites. Results from this short-term study showed that rewatering may potentially reverse the trend of increasing coverage by non-obligate wetland plants that have established in the past century as a result of regional desiccation.
Show less - Date Issued
- 2002
- PURL
- http://purl.flvc.org/fcla/dt/12887
- Subject Headings
- Forested wetlands--Florida--Big Cypress Swamp, Hydrology--Florida--Big Cypress Swamp, Ecosystem management--Florida--Big Cypress Swamp
- Format
- Document (PDF)
- Title
- Can Everglades forested wetlands significantly reduce nutrient concentrations in surface waters?.
- Creator
- Cole, Dara Michelle., Florida Atlantic University, Volin, John C.
- Abstract/Description
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To improve water quality as part of a large restoration effort, constructed herbaceous wetlands will be used as filters of high nutrient water. In this study, I tested whether mixed forested wetlands could also be used as nutrient filters. I examined water quality parameters within a forested slough isolated from direct anthropogenic disturbance and within an impounded forest wetland receiving direct agricultural effluent. Among the water quality parameters, TP and K concentrations in the...
Show moreTo improve water quality as part of a large restoration effort, constructed herbaceous wetlands will be used as filters of high nutrient water. In this study, I tested whether mixed forested wetlands could also be used as nutrient filters. I examined water quality parameters within a forested slough isolated from direct anthropogenic disturbance and within an impounded forest wetland receiving direct agricultural effluent. Among the water quality parameters, TP and K concentrations in the forested slough were particular low. Although all nutrients, except TKN, were higher in the impounded wetland, nutrient concentrations within the wetland were lower at interior sites as compared to inflow water. Based on the use of chloride as a conservative tracer, this reduction resulted predominantly from biological and chemical processes, while physical processes played a minimal role. This study established that mixed forested wetlands can significantly reduce high nutrient levels in surface water.
Show less - Date Issued
- 2001
- PURL
- http://purl.flvc.org/fcla/dt/12772
- Subject Headings
- Wetland ecology--Florida--Everglades, Restoration ecology--Florida--Everglades, Everglades (Fla )
- Format
- Document (PDF)
- Title
- Effects of Hydrology and Applied Gibberellic Acid and Paclobutrazol on the Growth of the Invasive Exotic Lygodium Microphyllum (Old World Climbing Fern).
- Creator
- Gandiaga, Sonia, Volin, John C., Florida Atlantic University
- Abstract/Description
-
I conducted a greenhouse study in order to examine the effects of hydrology and its interaction with gibberellic acid (GA3) on the invasive exotic Lygodium microphyllum (Old World climbing fern) growth and physiology. Three hydrological (flood, drought and field capacity) and three hormonal (gibberellic acid, paclobutrazol and water) treatments were studied using a 3x3 factorial experimental design. Plants under flooded conditions had a significantly lower relative growth rate compared to...
Show moreI conducted a greenhouse study in order to examine the effects of hydrology and its interaction with gibberellic acid (GA3) on the invasive exotic Lygodium microphyllum (Old World climbing fern) growth and physiology. Three hydrological (flood, drought and field capacity) and three hormonal (gibberellic acid, paclobutrazol and water) treatments were studied using a 3x3 factorial experimental design. Plants under flooded conditions had a significantly lower relative growth rate compared to plants under field capacity or drought. Plants under flooded conditions showed a significantly lower specific leaf area and area-based photosynthetic rate than plants under field capacity and drought treatments, resulting in significantly lower massbased photosynthesis. Overall, the variation in growth response to treatments was most explained by mass-based photosynthesis (r^2=0.66). Treatments with gibberellic acid or paclobutrazol (GA inhibitor) resulted in no differences in growth as compared to untreated plants.
Show less - Date Issued
- 2007
- PURL
- http://purl.flvc.org/fau/fd/FA00000771
- Subject Headings
- Plants--Effect of gibberellic acid on, Plants, Flowering of, Ferns--Physiology, Growth (Plants)
- Format
- Document (PDF)
- Title
- Does Water Hyacinth (Eichornia Crassipes) Compensate to Defoliation? Implications for Effective Biocontrol.
- Creator
- Soti, Pushpa G., Volin, John C., Florida Atlantic University
- Abstract/Description
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The aim of this study was to determine the effects of nutrient supply and artificial defoliation on the growth rate of water hyacinth. The plants were subjected to two levels of nutrient (high and low) and three levels (0%, 10% and 80%) of defoliation treatment. The effect of the nutrient and repeated defoliation treatments was detem1ined after six weeks. Ten percent defoliation did not show any significant difference from control plants in biomass allocation or relative growth rate (RGR) in...
Show moreThe aim of this study was to determine the effects of nutrient supply and artificial defoliation on the growth rate of water hyacinth. The plants were subjected to two levels of nutrient (high and low) and three levels (0%, 10% and 80%) of defoliation treatment. The effect of the nutrient and repeated defoliation treatments was detem1ined after six weeks. Ten percent defoliation did not show any significant difference from control plants in biomass allocation or relative growth rate (RGR) in either nutrient concentration, while 80% defoliation caused a significant decrease in the final RGR under high and low nutrient treatments. High nutrient treatment resulted in higher RGR and allocation to asexual reproduction, resulting in higher biomass accumulation compared to the low nutrient treatment, which had higher root growth and allocation to sexual reproduction. My data provide evidence that water hyacinth can fully compensate to low levels of defoliation.
Show less - Date Issued
- 2008
- PURL
- http://purl.flvc.org/fau/fd/FA00000834
- Subject Headings
- Growth (Plants), Defoliation, Phytopathogenic microorganisms--Biological control
- Format
- Document (PDF)
- Title
- Hydrologic and topographic gradient effects on woody vegetation of tree islands in the Everglades Wildlife Management Area.
- Creator
- Anderson, Michael Robert., Florida Atlantic University, Volin, John C.
- Abstract/Description
-
Water management in the Everglades has been a challenge for managing agencies for quite some time. Presently, restoration efforts are underway to reestablish natural hydrological patterns such as flow, depth, and hydroperiod. Tree island health is of particular concern because of its importance to the functional integrity of the greater Everglades ecosystem. This study was designed to determine the effects of different hydrological patterns and elevations on native woody vegetation on tree...
Show moreWater management in the Everglades has been a challenge for managing agencies for quite some time. Presently, restoration efforts are underway to reestablish natural hydrological patterns such as flow, depth, and hydroperiod. Tree island health is of particular concern because of its importance to the functional integrity of the greater Everglades ecosystem. This study was designed to determine the effects of different hydrological patterns and elevations on native woody vegetation on tree islands. The study site was the Everglades Wildlife Management Area (EWMA) in the north central Everglades. The study site was broken up into two hydrological zones: dry zone and moderately wet zone. It was found that both hydrology and relative elevation were important predictors of woody species diversity and density. Average hydroperiod and ponding depth were the best sole predictors explaining up to 50% of the woody vegetation variability found within the tail and fringe community as well as the whole tree island.
Show less - Date Issued
- 2000
- PURL
- http://purl.flvc.org/fcla/dt/12709
- Subject Headings
- Ecosystem management--Florida--Everglades, Woody plants--Florida--Everglades, Everglades Wildlife Management Area (Fla )
- Format
- Document (PDF)
- Title
- Non-indigenous fishes in restored and natural wetlands on the Big Cypress Seminole Indian Reservation.
- Creator
- Dunker, Kristine J., Florida Atlantic University, Volin, John C.
- Abstract/Description
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This study documented assemblages of native and non-indigenous fishes in restored and natural wetlands within the Big Cypress Swamp. Within the restored wetland, non-indigenous fishes constituted only a minor component of the entire fish community in the restored wetland, although large fish assemblages were dominated by non-indigenous fishes. Among assemblages of species with similar ecologies, nonindigenous species may impact native species in the restored wetland. Within the natural...
Show moreThis study documented assemblages of native and non-indigenous fishes in restored and natural wetlands within the Big Cypress Swamp. Within the restored wetland, non-indigenous fishes constituted only a minor component of the entire fish community in the restored wetland, although large fish assemblages were dominated by non-indigenous fishes. Among assemblages of species with similar ecologies, nonindigenous species may impact native species in the restored wetland. Within the natural wetlands, non-indigenous fishes became more conspicuous during the second year of this study. Hydroperiod and water depth were important factors influencing fish communities in both study habitats. Attempts to block access of non-indigenous fishes from canals into the restored wetland appeared to limit invasions of non-indigenous species, although it did not entirely exclude them. Two new non-indigenous fish species in the Big Cypress Swamp, Hoplosternum littorale and Belonesox belizanus were also documented.
Show less - Date Issued
- 2003
- PURL
- http://purl.flvc.org/fcla/dt/13055
- Subject Headings
- Nonindigenous aquatic pests--Florida--Big Cypress Swamp, Pest introduction--Prevention, Wetland ecology--Florida--Big Cypress Swamp
- Format
- Document (PDF)
- Title
- The effect of hydroperiod on the growth of the crayfish species Procambarus alleni and Procambarus fallax: Two keystone species in the Florida Everglades.
- Creator
- Gardner, Matthew D., Florida Atlantic University, Volin, John C.
- Abstract/Description
-
The Everglades ecosystem is home to two species of freshwater crayfish: the Everglades crayfish Procambarus alleni and the slough crayfish Procambarus fallax. These species play a key ecological role by transporting energy from primary producers to higher trophic levels. Understanding the factors that regulate crayfish growth is an essential step in restoring their productivity in the Everglades ecosystem. In order to determine the effect of hydroperiod on crayfish growth, I collected...
Show moreThe Everglades ecosystem is home to two species of freshwater crayfish: the Everglades crayfish Procambarus alleni and the slough crayfish Procambarus fallax. These species play a key ecological role by transporting energy from primary producers to higher trophic levels. Understanding the factors that regulate crayfish growth is an essential step in restoring their productivity in the Everglades ecosystem. In order to determine the effect of hydroperiod on crayfish growth, I collected crayfish from the Florida Everglades and subjected them to one of three hydroperiod treatments. The growth of both crayfish species in reduced hydroperiod treatments was significantly less than those in long hydroperiod treatments. Procambarus alleni had a significantly faster initial growth rate than P. fallax, which may give it a competitive advantage in shorter hydroperiod marshes and help explain the distributions of these two species. The results of this study indicate that lengthening hydroperiods in the Everglades ecosystem may have a positive effect on crayfish productivity.
Show less - Date Issued
- 2006
- PURL
- http://purl.flvc.org/fcla/dt/13361
- Subject Headings
- Ecosystem management--Florida--Everglades National Park, Everglades National Park (Fla ), Crayfish--Habitat--Florida--Everglades National Park, Wetland ecology--Florida--Everglades National Park
- Format
- Document (PDF)
- Title
- The effects of flow on the taxonomic composition of Everglades periphyton.
- Creator
- Hiaasen, Barbara A., Florida Atlantic University, Volin, John C.
- Abstract/Description
-
Analysis of the relationship of velocity to taxonomic composition of periphyton-based stormwater treatment areas, in conjunction with other metrics, is a valuable tool for evaluating the phosphorus removal efficiency of this Everglades restoration advanced treatment technology. Periphyton taxonomic composition, biomass, water and tissue total phosphorus (TP), pH, and temperature were analyzed in three slow velocity (0.22 cm s-1) and three fast velocity (2.0 cm s-1) mesocosms. Loading rate,...
Show moreAnalysis of the relationship of velocity to taxonomic composition of periphyton-based stormwater treatment areas, in conjunction with other metrics, is a valuable tool for evaluating the phosphorus removal efficiency of this Everglades restoration advanced treatment technology. Periphyton taxonomic composition, biomass, water and tissue total phosphorus (TP), pH, and temperature were analyzed in three slow velocity (0.22 cm s-1) and three fast velocity (2.0 cm s-1) mesocosms. Loading rate, retention time and surface area were kept constant, with velocity the single variable between treatments. There was no significant difference in taxonomic composition, water TP, tissue TP, or temperature between the slow and fast treatments. However, dominant eutrophic and oligotrophic indicator genera exhibited significant and consistent changes in relative abundance related to location along the treatment path. Biomass accrual was 30% greater in the fast treatment and TP uptake was positively correlated with increased velocity.
Show less - Date Issued
- 2003
- PURL
- http://purl.flvc.org/fcla/dt/13056
- Subject Headings
- Periphyton--Florida--Everglades, Water--Phosphorus content--Florida--Everglades
- Format
- Document (PDF)
- Title
- The effects of flow on phosphorus uptake by periphyton.
- Creator
- Simmons, Steven P., Florida Atlantic University, Volin, John C.
- Abstract/Description
-
Everglades restoration includes construction of six Stormwater Treatment Areas (STAs) totaling over 16,000 hectares. These filter marshes are designed to remove excess phosphorus from agricultural runoff and urban wastewater before it reaches the Everglades. Optimizing flow through these wetlands may be important in increasing the efficiency of nutrient removal and achieving lower outflow phosphorus concentrations. We measured periphyton growth and phosphorus uptake in two sets of replicated...
Show moreEverglades restoration includes construction of six Stormwater Treatment Areas (STAs) totaling over 16,000 hectares. These filter marshes are designed to remove excess phosphorus from agricultural runoff and urban wastewater before it reaches the Everglades. Optimizing flow through these wetlands may be important in increasing the efficiency of nutrient removal and achieving lower outflow phosphorus concentrations. We measured periphyton growth and phosphorus uptake in two sets of replicated mesocosms in post-STA treatment water. Flow rates for the study were 1.0 cm s^-1 and 0.11 cm s^-1. Unique mesocosm design allowed for simultaneous control of loading rate, retention time and surface area, leaving flow rate as the single variable between treatments. Periphyton biomass accrual was 25% greater in the faster treatment. Measurements of dissolved oxygen were positively correlated with biomass accrual and there was no significant difference in the export of biomass between treatments.
Show less - Date Issued
- 2001
- PURL
- http://purl.flvc.org/fcla/dt/12764
- Subject Headings
- Periphyton, Water--Phosphorus content--Florida--Everglades
- Format
- Document (PDF)
- Title
- The distribution of the non-indigenous invasive Old World climbing fern, Lygodium microphyllum, in southern Florida: The relationship to abiotic and biotic variables.
- Creator
- Stewart, Joy Elaine., Florida Atlantic University, Volin, John C.
- Abstract/Description
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Old World Climbing Fern, Lygodium microphyllum is an aggressive nonindigenous plant that is on the verge of becoming a major ecological threat in South Florida. Currently, specific habitat characteristics that contribute to success or failure of its establishment are unknown. I studied the pattern of distribution of the fern in Florida's Big Cypress Swamp. Two similar forested wetland sites with high incidence of L. microphyllum infestation were assessed in order to identify broad-scale...
Show moreOld World Climbing Fern, Lygodium microphyllum is an aggressive nonindigenous plant that is on the verge of becoming a major ecological threat in South Florida. Currently, specific habitat characteristics that contribute to success or failure of its establishment are unknown. I studied the pattern of distribution of the fern in Florida's Big Cypress Swamp. Two similar forested wetland sites with high incidence of L. microphyllum infestation were assessed in order to identify broad-scale hydrological and physiographic conditions that may favor high susceptibility to L. microphyllum invasion. On each site, species richness, abundance and distribution of herbs, shrubs and trees were characterized. In addition, several parameters including elevation, substrate depth, percentage substrate water content, percentage substrate organic content, substrate texture, and photosynthetically active radiation were quantified. The patterns of distribution of L. microphyfum indicated that presence of the fern was dependent on relatively low elevation, relatively deep substrate and moderately high substrate water content.
Show less - Date Issued
- 2002
- PURL
- http://purl.flvc.org/fcla/dt/12890
- Subject Headings
- Ferns--Florida, Lygodium, Ecosystem management, Invasive plants--Florida
- Format
- Document (PDF)
- Title
- The reproductive biology of Lygodium microphyllum and L. japonicum, two invasive fern species in Florida.
- Creator
- Lott, Michael Stephen, Florida Atlantic University, Volin, John C.
- Abstract/Description
-
Lygodium microphyllum and L. japonicum are two non-indigenous invasive climbing ferns which are currently spreading through Florida. The reproductive biology of both species was examined to determine if their reproductive strategy partially explains this spread. Gametophytes of both species were grown in vitro as isolates and pairs to examine reproductive strategies. L. microphyllum appeared to be capable of both outcrossing and selfing, while in L. japonicum intragametophytic selfing...
Show moreLygodium microphyllum and L. japonicum are two non-indigenous invasive climbing ferns which are currently spreading through Florida. The reproductive biology of both species was examined to determine if their reproductive strategy partially explains this spread. Gametophytes of both species were grown in vitro as isolates and pairs to examine reproductive strategies. L. microphyllum appeared to be capable of both outcrossing and selfing, while in L. japonicum intragametophytic selfing appeared to be the primary mode of sexual reproduction. Outcrossing in L. microphyllum appeared to be the result of an antheridiogen system that affected sexual expression of neighboring gametophytes and subsequent sporophyte production. Seventy-eight percent of L. microphyllum isolates produced sporophytes while over ninety percent of the L. japonicum isolates produced sporophytes. The high selfing rates achieved by both species likely facilitated their spread through Florida, while the outcrossing ability of L. microphyllum may increase its adaptability and invasive potential.
Show less - Date Issued
- 2001
- PURL
- http://purl.flvc.org/fcla/dt/12770
- Subject Headings
- Ferns--Florida, Lygodium, Plants--Reproduction
- Format
- Document (PDF)
- Title
- Utilization distribution as a predictor in modeling black rhino (Diceros bicornis) habitat in Africa's southern Rift Valley.
- Creator
- van der Heiden, Craig., Florida Atlantic University, Volin, John C.
- Abstract/Description
-
An innovative technique of evaluating resource selection for black rhino (Diceros bicornis) was used to assess the population utilization distribution (PUD) within a rhino sanctuary in Liwonde National Park, Malawi. The PUD enabled an evaluation of responses to habitat variables over a spatial gradient of resource selection. A Geographic Information System (GIS) was constructed using vegetation, browse availability, roads, rivers, water holes and satellite imagery. Linear models were...
Show moreAn innovative technique of evaluating resource selection for black rhino (Diceros bicornis) was used to assess the population utilization distribution (PUD) within a rhino sanctuary in Liwonde National Park, Malawi. The PUD enabled an evaluation of responses to habitat variables over a spatial gradient of resource selection. A Geographic Information System (GIS) was constructed using vegetation, browse availability, roads, rivers, water holes and satellite imagery. Linear models were developed to quantify habitat variables within the black rhino sanctuary and park. The sanctuary model was calibrated within a known core area (R^2=0.42, P<0.001), validated in a second area (R^2=0.56, P<0.001) within the sanctuary and, subsequently, used to predict potential black rhino habitat within the remaining sanctuary boundaries. The model for the entire Liwonde National Park predicted additional black rhino habitat (R^2=0.25, P<0.05). Population utilization distribution was found to be a powerful conservation tool for determining suitable black rhino habitat.
Show less - Date Issued
- 2005
- PURL
- http://purl.flvc.org/fcla/dt/13296
- Subject Headings
- Habitat selection--Statistical methods, Liwonde National Park (Malawi), Rift Valley Province (Kenya), Wildlife conservation--Africa, Habitat (Ecology)
- Format
- Document (PDF)
- Title
- Mitochondrial DNA damage in C. elegans sperm as a function sperm activity.
- Creator
- Willis, Joel P., Florida Atlantic University, Volin, John C., LaMunyon, Craig W.
- Abstract/Description
-
Several models for the evolution of maternal inheritance of mitochondria predict that the sperm mitochondria undergo oxidative damage and pose a threat to the developing embryo. Here, I test the hypothesis that the sperm are damaged by reactive oxygen species generated by aerobic sperm activity. In my first experiment, I found no significant difference in fecundity between worms fertilized by old versus young sperm, suggesting that the sperm nuclear genome is not affected by the extent of...
Show moreSeveral models for the evolution of maternal inheritance of mitochondria predict that the sperm mitochondria undergo oxidative damage and pose a threat to the developing embryo. Here, I test the hypothesis that the sperm are damaged by reactive oxygen species generated by aerobic sperm activity. In my first experiment, I found no significant difference in fecundity between worms fertilized by old versus young sperm, suggesting that the sperm nuclear genome is not affected by the extent of sperm activity. In my second experiment, I found that sperm mitochondrial DNA has deletions, indicating damage, but this damage does not accumulate with sperm activity. However, problems with PCR amplification resulted in little experimental data, preventing a conclusive test of the hypothesis.
Show less - Date Issued
- 2003
- PURL
- http://purl.flvc.org/fcla/dt/13083
- Subject Headings
- Caenorhabditis elegans, Worms--Spermatozoa, Worms--Genetics
- Format
- Document (PDF)
- Title
- Forest wetland response to nutrient enrichment on the Big Cypress Seminole Indian Reservation.
- Creator
- Jacobs, Alyssa B., Florida Atlantic University, Volin, John C., Charles E. Schmidt College of Science, Department of Biological Sciences
- Abstract/Description
-
The Big Cypress Swamp and the Everglades of South Florida are inherently oligotrophic ecosystems that in recent decades have been subjected to increasing agricultural nutrient inputs. While extensive research regarding deleterious effects of nutrient impacts has been conducted in the phosphorus-deficient Everglades, there is a lack of research in Big Cypress Swamp. This 12-month field study assessed the responsiveness of Taxodium distichum, Fraxinus caroliniana, and herbaceous vegetation to...
Show moreThe Big Cypress Swamp and the Everglades of South Florida are inherently oligotrophic ecosystems that in recent decades have been subjected to increasing agricultural nutrient inputs. While extensive research regarding deleterious effects of nutrient impacts has been conducted in the phosphorus-deficient Everglades, there is a lack of research in Big Cypress Swamp. This 12-month field study assessed the responsiveness of Taxodium distichum, Fraxinus caroliniana, and herbaceous vegetation to increased nutrient levels in Big Cypress Swamp. Six nutrient treatments (Control, N, P, K, 2K, and PxK) were applied to the soil surrounding these trees. F. caroliniana had higher photosynthetic rates with 2K treatments and higher growth rates with PxK treatments. T. distichum had higher Leaf Area Index in the P and PxK treatment but did not exhibit other responses to treatment. Herbaceous vegetation showed little response to treatments. This study concluded that potassium may be co-limiting in this ecosystem.
Show less - Date Issued
- 2004
- PURL
- http://purl.flvc.org/fcla/dt/13129
- Subject Headings
- Wetland ecology--Florida, Restoration ecology--Florida, Everglades (Fla ), Big Cypress Swamp (Fla ), Seminole Tribe of Florida, Discrimination learning
- Format
- Document (PDF)