Gerardo Camilo

Gerardo Camilo
Saint Louis University | SLU · Department of Biology

Doctor of Philosophy

About

59
Publications
18,466
Reads
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961
Citations
Additional affiliations
August 1995 - present
Saint Louis University
Position
  • Professor (Associate)

Publications

Publications (59)
Article
Full-text available
High morphological variation is often associated with species longevity, and it is hypothesized that urban-dwelling species may require more plasticity in functional traits such as body size in order to maximize fitness in heterogeneous environments. There has been published research regarding the functional trait diversity of urban bee pollinators...
Chapter
communication theory and principles applied to the pollinator crisis and UN Sustainable Development Goalds (SDGs)
Article
Full-text available
In vascular plants, larger seeds are generally associated with higher germination potential, healthier seedlings and overall higher rates of survivorship. How this relationship holds or what other physiological tradeoffs evolved in plants adapted to high-altitude environments, such as the tropical and subtropical highland Polylepis tree, remain unc...
Article
Full-text available
Hand-pollination experiments followed by epifluorescence microscopy of pistils of Uvularia grandiflora Smith (Colchicaceae) indicated a trend toward late-acting self-incompatibility. Pollen tube growth in pistil tissue of bagged but unmanipulated flowers (mechanical self-pollination) was insignificant. As each pistil produces three stigmatic lobes,...
Article
Full-text available
This study was done to test the palatability of leaves of mangroves growing in a highly and lowly polluted environment. We hypothesized that bottom-up transfer of pollutants from soil to leaves would influence herbivory due to the toxic effect of pollution. Exclusion experiment was done to test for leave herbivory in lowly and highly polluted plots...
Article
The aims of this study were to determine if a propofol constant rate infusion (CRI) in Speke's gazelle, Gazella spekei, would serve as an effective alternative maintenance anesthetic, result in shorter recovery times, and improve anesthetic recovery quality when compared with isoflurane. Eight adult gazelle were enrolled in this complete crossover...
Article
Background and Objective: Hydrocarbon pollution and seasonal changes cause defoliation and litter fall, respectively. It is hypothesized that increasing pollution and rapid seasonal changes can cause increased litter fall. The objectives of the study were (1) To determine the annual litter fall of leaves, fruits and flowers, (2) To determine the to...
Article
Full-text available
Background and Objective: Hydrocarbon pollution and seasonal changes cause defoliation and litter fall, respectively. It is hypothesized that increasing pollution and rapid seasonal changes can cause increased litter fall. The objectives of the study were (1) To determine the annual litter fall of leaves, fruits and flowers, (2) To determine the to...
Article
Full-text available
The pollination ecology of two sympatric varieties of Cypripedium parviflorum was compared to determine whether floral dimensions had an impact upon potential pollinator diversity. We observed, collected and compared 235 insects that entered the labella of sympatric populations of C. parviflorum vars. parviflorum and pubescens and compared the inse...
Article
Full-text available
Climate change influences the distribution of mangroves towards tropical or temperate regions of the world. We hypothesized that Rhizophora species organized along complex spatial and temporal temperature and precipitation gradient. To determine the affinity of different mangroves with climatic parameters, the response of eight Rhizophora species t...
Article
Full-text available
Concern over the declines of pollinator populations during the last decade has resulted in calls from governments and international agencies to better monitor these organisms. Recent studies of bee diversity in urban environments suggest that cities may contain significant amounts of bee species, even greater than surrounding agricultural areas, an...
Article
Full-text available
Premise of research. Anemophily is considered to be a mechanism that evolved to promote pollination success. However, reproductive output can decrease if pollen loads are scarce due to low abundance of compatible mates or floral infections. Here we analyze the effects of breeding system, pollen limitation, and a potential floral fungal infection on...
Article
Full-text available
Urban ecology research is changing how we view the biological value and ecological importance of cities. Lagging behind this revised image of the city are natural resource management agencies' urban conservation programs that historically have invested in education and outreach rather than programs designed to achieve high-priority species conserva...
Article
Full-text available
We compared pollinators, pollination rates and seed set of bicolour and concolour morphs in self-incompatible, Viola pedata over two seasons. The two populations grew on a wooded slope (CR) vs. an exposed glade (SNR) and were of unequal sizes. Both were burned in 2014. The number of flowers produced by concolour plants at SNR was higher in 2014 whi...
Research
Full-text available
Pollinator health (species richness and abundance) is in decline globally and recognized as a crisis by governments, scientists, and the public. Specifically, bees (Hymenoptera: Apoidea) are critical both ecologically and economically to wild and managed crops worldwide. The potential causes of reduced pollinator richness and abundance are linked t...
Article
Full-text available
Bees (Hymenoptera: Apoidea) are critical to crop production globally. In the last decade, significant declines in managed and native bee health have been documented, and it is now widely considered a “crisis.” The potential causes of reduced wild bee health (species richness and abundance) relate to land-use decisions, practices, and management inc...
Article
Full-text available
Nutrient cycling often moves between litter fall and decomposition. It is hypothesized that hydrocarbon pollution will slow down mangrove litter decomposition because of the reduction in microbial activities. We studied decomposition rates at different levels of pollution (i.e. high and low) and amongst different mangrove species (i.e. red, white a...
Article
Full-text available
The Niger Delta mangrove is the third largest in the world and the largest in Africa. Since the 1960s oil and gas exploration has become an important economic activity, resulting in significant alteration of the landscape via pollution, urbanization and invasion. Landsat images of six different years (1984, 1986, 2000, 2003, 2005 and 2007) were use...
Article
Full-text available
Years of oil and gas exploration and spread of exotic nypa palm has converted the mangroves into a disturbed system. It is hypothesized that polluted soils will have adverse effect on the growth of mangrove and Nypa palm seedlings. This hypothesis was tested using a reciprocal transplant experiment on soils with different levels of pollution. Soil...
Article
Full-text available
Orchid species that are food mimics produce fewer fruits than species offering rewards, but few studies have shown the impact of environmental factors (e.g. anthropogenic activity, frost and herbivores) on their reproductive success over several seasons. In this study, we focused on the sole population of the endangered Calanthe yaoshanensis as it...
Conference Paper
Background/Question/Methods Urban biodiversity is a rising area of interest but little is known about bee diversity and how it responds to urban and inner-city environments. With urbanization increasing worldwide, and bee populations declining is essential that we understand how these factors are related. Previous studies have tried to understand...
Conference Paper
Background/Question/Methods Pollinators are an important component of ecosystems, providing an essential service for plant reproduction, including food production. Among pollinators, bees are some of the most efficient and diverse members. This diversity allow for a range of species to go from generalists, like honey bees, to highly specialized,...
Article
The ability to safely and effectively manage reproduction is central to the success of AZA captive-breeding programs. Although the AZA Wildlife Contraception Center routinely monitors contraceptive safety, there have been no studies that compare the effects of contraceptive use to separation of males from females, the other option for preventing re...
Article
Full-text available
In the Andean highlands, Polylepis woodlands are a rare and unique ecosystem of the treeline. Although human activities have caused the loss of extensive forested areas and decreased woodland regeneration, few systematic and quantitative assessments have been carried out in Polylepis forests. This study compares differences in habitat characteristi...
Article
Full-text available
Fenología reproductive de Polylepis tomentella (Rosaceae) en Chuquisaca (Bolivia) Fenología reproductiva de la kewiña (Polylepis tomentella, Rosaceae) en la puna semihúmeda de Chuquisaca (Bolivia) Reproductive phenology of kewiña (Polylepis tomentella, Rosaceae) in the semi-humid puna of Chuquisaca (Bolivia) Resumen En el presente estudio evaluamos...
Conference Paper
Background/Question/Methods The urban core of many traditional, post-industrial cities has been steadily emptying (e.g., Cleveland, Detroit, St. Louis, Pittsburgh), something that represents a major challenge to a city’s sustainability. Migration to the suburbs has also led to significant socioeconomic disparities within the urban core, further c...
Conference Paper
Background/Question/Methods The typical sustainability policy vision paints a vibrant urban landscape that combines “green” with wholly sustainable communities that are idealized visions of the real world. Alternatively, for many post-industrial cities that once served important economic functions, the concept of sustainability is highly elusive....
Conference Paper
Full-text available
Background/Question/Methods Successful sexual reproduction in wind-pollinated tree species depends on multiple demographic and reproductive traits. Reproductive success can also be negatively affected by anthropogenic disturbance, which can alter pollen movement and pollination efficiency. In this study, we examined several aspects of the pollinat...
Chapter
Full-text available
This chapter describes the geologic, geographic, and ecological context of the location of Luquillo Mountains, particularly the factors affecting the response mechanisms of terrestrial and aquatic ecosystems to disturbance. It describes the existing conditions of the physical environment, chemical environment, and the biota of the Luquillo Mountain...
Chapter
Full-text available
This chapter describes the responses of the organisms, communities, and ecosystems to the variety of disturbances by utilizing the conceptual model discussed in Chapter 2. It also dwells on the concepts of residuals, legacies, and ecological space in the understanding of disturbances such as background treefalls, hurricanes, floods, drought, landsl...
Conference Paper
Background/Question/Methods With the recent surge in arboviruses throughout North America, mosquitoes have become more than a nuisance; they have become a serious health risk. Understanding the population biology of these disease vectors at both small and large scales (single and multiple populations) will be crucial to effectively assessing the r...
Conference Paper
Background/Question/Methods The human alteration of ecosystems constitutes a serious threat to tree species. This is more intense in developing countries where mountain forests provide firewood and area for farming. In the Neotropics, mountain forests have been highly impacted by small-scale activities such as selective logging, burning, and farmi...
Conference Paper
Full-text available
Introduction - Seed predation changes across spatial and temporal scales. We are yet to identify, however, the scale at which it operates (i.e., fruit, plant or population) and link it to factors responsible for scale variation (i.e., fruit traits). Scale-concordance occurs if regional correlations between plant traits and seed loss result from an...
Conference Paper
Background/Question/Methods With the recent surge in arboviruses throughout North America, mosquitoes have become more than a nuisance; they have become a serious health risk. Understanding the population biology of these disease vectors at both small and large scales (single and multiple populations) will be crucial to effectively assessing the r...
Conference Paper
Full-text available
Background/Question/Methods Seed predation is pervasive in tropical forest systems and an important cause of reproductive loss for many plant species. This can have a strong selective force on plants to increase defenses against seed predators. On the other hand, insects that are obligate seed predators must evolved mechanism to match those of th...
Data
Introduction - Seed predation changes across spatial and temporal scales. We are yet to identify, however, the scale at which it operates (i.e., fruit, plant or population) and link it to factors responsible for scale variation (i.e., fruit traits). Scale-concordance occurs if regional correlations between plant traits and seed loss result from an...
Article
Fatty acid analyses of seed lipids were performed for 28 populations representing three widely distributed Cuphea species. Locality and climatic data for all samples were also compiled. The objectives of this study were to examine the extent of variation in seed oil composition among the wild populations, and to discover any patterns of relationshi...
Article
Fresh fecal samples were collected from seven adult female reticulated giraffe (Giraffa camelopardalis reticulata). Samples were collected for several weeks before, during, and for a few weeks after gestation. Fecal samples were analyzed for progesterone levels by radioimmunoassay. There were significant differences in progesterone levels between p...
Technical Report
Este informe provee un análisis completo de los datos colectados durante el estudio sobre la cacería y las poblaciones de animales silvestres en el territorio indígena Kipla Sait Tasbaika (KST), llevado a cabo bajo la supervisión del Proyecto Biodiversidad del Zoológico de San Luis y en colaboración con la asociación indígena, KUNASPAWA, y los comu...
Conference Paper
Full-text available
Ethnobiology is the scientific study of dynamic relationships among peoples, biota, and environments. Ethnobiology is multidisciplinary; the Ethnobiology Working Group (see insert) includes representatives from systematics, population biology, ecology, mathematical biology, cultural anthropology, ethnography, archaeology, geography, pharmacology, n...
Article
The phasmid Lamponius nebulosus is described and information is provided about host plants, defensive behavior, and distribution.
Article
A simulation model, based on a series of Holling type II differential equations, was used to assess the effects of omnivory on the dynamics of individual populations at different trophic levels, as well as on the stability and persistence of food chains. Initial population densities were euqal to actual field estimates, whereas predation rates and...
Article
Previous studies on size patterns within frugivorous and insectivorous bat guilds from northeastern Brazil suggest significant ecological separation of species. Nonetheless, recent simulation studies indicate that stochastic processes alone, rather than competition or coevolution, account for the morphological structure of these communities. To eva...
Article
Although the importance of disturbance regimes in affecting ecosystem structure and function is becoming an accepted paradigm in ecology, the consequences of catastrophic events are poorly understood. On 18 September 1787 Hurricane Hugo struck Puerto Rico, with the center of the hurricane passing within ten kilometers of the Luquillo Experimental F...
Article
Thesis (Ph. D.)--Texas Tech University, 1992. Includes bibliographical references.

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