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Articles 1 - 19 of 19
Full-Text Articles in Entire DC Network
Population Density, Habitat Dynamic And Aerial Survival Of Relict Cave Bivalves From Genus Congeria In The Dinaric Karst, Olga Jovanović Glavaš, Branko Jalžić, Helena Bilandžija
Population Density, Habitat Dynamic And Aerial Survival Of Relict Cave Bivalves From Genus Congeria In The Dinaric Karst, Olga Jovanović Glavaš, Branko Jalžić, Helena Bilandžija
International Journal of Speleology
Caves are some of the least-known ecosystems on Earth and long-term ecological studies and population size estimates are very rare. Genus Congeria is a Tertiary relict that comprises three species from Dinaric karst area; C. kusceri, C. jalzici and C. mulaomerovici, each with very limited distribution. They are the only known cave bivalves and in contrast to many other cave species, they form populations with high densities. We estimated that the population of C. kusceri in Jama u Predolcu is between 72,454 and 72,906 individuals. The highest density occurred between one and three meters depth, and reached maximum …
Evaluation Of Search And Rescue Planning Tools On The West Florida Shelf, Benjamin O'Loughlin
Evaluation Of Search And Rescue Planning Tools On The West Florida Shelf, Benjamin O'Loughlin
USF Tampa Graduate Theses and Dissertations
The Coast Guard conducts over 20,000 search and rescue cases a year with approximately 5% of them occurring within the coastal waters of the West Florida Shelf (WFS). Each search effort is planned using the Coast Guard’s Search and Rescue Optimal Planning System (SAROPS) which uses model inputs to create composite probability distributions based on the results of Monte Carlo projections of thousands of particle trajectories. However, SAROPS is limited by the quality of model inputs and their associated errors. This study utilizes observations from three surface drifter deployments on the WFS to evaluate the effectiveness of available surface current …
Hybrid Taguchi-Objective Function Optimization Approach For Automatic Cave Bird Detection From Terrestrial Laser Scanning Intensity Image, Mohammed O. Idrees, Biswajeet Pradhan
Hybrid Taguchi-Objective Function Optimization Approach For Automatic Cave Bird Detection From Terrestrial Laser Scanning Intensity Image, Mohammed O. Idrees, Biswajeet Pradhan
International Journal of Speleology
This paper proposes an optimized Taguchi-objective function segmentation-based image analysis to detect bird nests in a cave from high resolution terrestrial laser scanning intensity images. First, the Taguchi orthogonal array was used to design 25 experiments with three segmentation parameters: scale, shape, and compactness, each having five variable factor levels. Then, a plateau objective function was computed for each experiment using their respective level combinations. A merger of the factor level combination in the orthogonal array and the computed plateau objective function values was used to generate main effects and interaction plots for signal-to-noise ratios, which provided a measure of …
Coefficients De Diversité Des Populations Dans I'Écosystème Souterrain, R. R. Tercafs
Coefficients De Diversité Des Populations Dans I'Écosystème Souterrain, R. R. Tercafs
International Journal of Speleology
The evolution of faunal composition in a subterranean cavity of simple structure (Trou des Nutons, Chaudfontaine, Belgium) has been studied. Quantitative comparisons have been carried on in the two most important parts of the cave - the external zone and the deep zone - using diversity and similarity coefficients. It has been found that the external zone presents a great redistribution of the fauna while the deep zone is more stable. However, the whole cave community stays relatively constant during time.
Molecular Response Of Spartina Alterniflora To The Deepwater Horizon Oil Spill, Mariano Alvarez
Molecular Response Of Spartina Alterniflora To The Deepwater Horizon Oil Spill, Mariano Alvarez
USF Tampa Graduate Theses and Dissertations
Although the “genome as a blueprint” metaphor has been pervasive in biology, recent advances in molecular biology have revealed a complex network of regulatory machinery that dynamically regulated molecular processes in response to environmental conditions. However, these patterns, as well as the evolutionary processes that underlie them, remain understudied in natural conditions. In 2010, the Deepwater Horizon oil spill released an estimated 4.9 million barrels of oil into the Gulf of Mexico, making landfall on salt marsh habitat dominated by the foundation species Spartina alterniflora. Despite the severe impacts to phenotype and fitness, S. alterniflora proved remarkably resilient in …
Development And Validation Of A Remote Sensing Model To Identify Anthropogenic Boreholes That Provide Dry Season, Refuge Habitat For Anopheles Vector Mosquitoes In Sub-Saharan Africa, James Pkemoi Kukat
USF Tampa Graduate Theses and Dissertations
A lack of surveillance systems is an impediment to public health intervention for perennial vector-borne disease transmission in northern tropical savanna region of Kenya. The population in this area are mostly poor nomadic pastoralists with little acquired functional immunity to Plasmodium falciparum, due to infrequent challenges with the parasite. A common characteristic in tropical savanna climatic zone is the availability of riverbeds that have anthropogenic boreholes that provide malaria vector mosquitoes, such as Anopheles gambiae s.l and Anopheles funestus, with aquatic refuge habitats for proliferation and endemic transmission to proximity human households during the dry-season. Unfortunately, currently there …
Quantifying The Association Between Active Tuberculosis Incidence And Migrant Farm Worker Populations Among Florida Counties, 2009-2013: An Ecological Study, Ryan Nicolas Ortega
Quantifying The Association Between Active Tuberculosis Incidence And Migrant Farm Worker Populations Among Florida Counties, 2009-2013: An Ecological Study, Ryan Nicolas Ortega
USF Tampa Graduate Theses and Dissertations
Nearly 20 studies conducted in the last 40 years indicate that tuberculosis (TB) represents a major health concern among migrant farm worker (MFW) populations, but their role in the transmission of TB within the broader community is poorly understood. To this end an ecological study was undertaken which examined 67 Florida counties between years 2009 through 2013. Its aims were as follows: (1) to describe the demographic, geographic, and temporal distribution of the incidence of active TB, (2) to examine the effect of agriculturally relevant seasonal periods on the incidence of active TB, and (3) to quantify the strength and …
Chemical Investigation Of Antarctic Marine Organisms & Their Role In Modern Drug Discovery, Jacqueline Lee Fries
Chemical Investigation Of Antarctic Marine Organisms & Their Role In Modern Drug Discovery, Jacqueline Lee Fries
USF Tampa Graduate Theses and Dissertations
The chemicals produced by biological systems, whether proteins, peptides, or terpenes, will always provide an intriguing topic for researchers. Invisibly controlling every aspect of nature, these molecules are responsible for life, evolution, and death. Specifically, here is described the secondary metabolites produced by Antarctic marine organisms as well as others, and how they are used to defend or attract other animals while potentially providing health benefits to mankind. This is done through collection, extraction, and separation of individual specimens. The respective mixtures of compounds after isolation are then analyzed via spectroscopic methods such as nuclear magnetic resonance spectroscopy, mass spectrometry, …
Late Holocene Palaeohydrological Changes In A Sphagnum Peat Bog From Nw Romania Based On Testate Amoebae, Andrei-Cosmin Diaconu, Roxana Grindean, Andrei Panait, Ioan Tanţău
Late Holocene Palaeohydrological Changes In A Sphagnum Peat Bog From Nw Romania Based On Testate Amoebae, Andrei-Cosmin Diaconu, Roxana Grindean, Andrei Panait, Ioan Tanţău
Studia UBB Geologia
This paper investigates the possibility of reconstructing the palaeohydrological changes in an active Sphagnum peat bog from north-western Romania using testate amoebae fauna and organic matter content determined by loss on ignition (LOI). In total 28 taxa of testate amoebae were identified of which 11 were frequent enough to present a remarkable ecological significance. Based on the relative abundance of these taxa nine zones were identified, crossing from very wet to dry climate conditions. The wet periods identified are characterized by taxa like Centropyxis cassis, Amphitrema flavum and Hyalosphenia papilio, while in the dry periods Difflugia pulex and …
Conservation Ecology Of Cave Bats, Neil M. Furey, Paul A. Racey
Conservation Ecology Of Cave Bats, Neil M. Furey, Paul A. Racey
KIP Articles
Caves and other subterranean sites such as mines are critical to the survival of hundreds of bat species worldwide, since they often provide shelter for most of a nation’s bat fauna. In the temperate zone, caves provide roosts for hibernation and for some species, breeding in summer, whereas in warmer regions, they support high species richness year round and enormous colonies that maintain substantial ecosystem services. Due to the solubility of the substrate, the highest densities of caves occur in karst landscapes. Given their importance for bats, relatively few studies have investigated factors involved in cave selection, although current evidence …
Assessing Future Vegetation Trends And Restoration Prospects In The Karst Regions Of Southwest China, Xiaowei Tong, Kelin Wang, Martin Brandt
Assessing Future Vegetation Trends And Restoration Prospects In The Karst Regions Of Southwest China, Xiaowei Tong, Kelin Wang, Martin Brandt
KIP Articles
To alleviate the severe rocky desertification and improve the ecological conditions in Southwest China, the national and local Chinese governments have implemented a series of Ecological Restoration Projects since the late 1990s. In this context, remote sensing can be a valuable tool for conservation management by monitoring vegetation dynamics, projecting the persistence of vegetation trends and identifying areas of interest for upcoming restoration measures. In this study, we use MODIS satellite time series (2001–2013) and the Hurst exponent to classify the study area (Guizhou and Guangxi Provinces) according to the persistence of future vegetation trends (positive, anti-persistent positive, negative, anti-persistent …
Characterization Of The Fishing Lines In Titiwai (=Arachnocampa Luminosa Skuse, 1890) From New Zealand And Australia, Janek Von Byern, Victoria Dorrer, David J. Merritt
Characterization Of The Fishing Lines In Titiwai (=Arachnocampa Luminosa Skuse, 1890) From New Zealand And Australia, Janek Von Byern, Victoria Dorrer, David J. Merritt
KIP Articles
Animals use adhesive secretions in a plethora of ways, either for attachment, egg anchorage, mating or as either active or passive defence. The most interesting function, however, is the use of adhesive threads to capture prey, as the bonding must be performed within milliseconds and under unsuitable conditions (movement of prey, variable environmental conditions, unfavourable attack angle, etc.) to be nonetheless successful. In the following study a detailed characterization of the prey capture system of the world-renowned glowworm group Arachnocampa from the macroscopic to the ultrastructural level is performed. The data reveal that the adhesive droplets consist mostly of water …