Orientador: Angelo Pires do Prado / Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Biologia / Made available in DSpace on 2018-08-04T01:37:12Z (GMT). No. of bitstreams: 1 Maia_IvanildaCerqueira_M.pdf: 170154 bytes, checksum: 003448dc78ec303062274bbf02b63778 (MD5) Previous issue date: 2004 / Resumo: Os sistemas de produção animal em confinamento são ambientes artificiais que favorecem o aparecimento da comunidade de artrópodes, devido à oferta de recursos que beneficiam o desenvolvimento desses organismos em acúmulo de esterco. Muitos ácaros encontram condições adequadas de sobrevivência nesses ambientes. Neste trabalho estudamos a dinâmica da associação forética entre ácaros e coleópteros predadores, analisando a ocorrência, abundância das famílias de ácaros associadas a histerídeos, bem como a diversidade acarofauna, a ocorrência de forésia entre os mesmos, através do estudo das infrapopulações e infracomunidades e dos índices de prevalência, dominância e uniformidade em granja de aves poedeiras em São João da Boa Vista - SP. Foram usadas duas metodologias de coletas para este estudo: amostras coletadas manualmente do esterco e armadilhas de solo. Foram realizadas oito coletas nas estações do ano 2002 e 9 coletas no ano de 2001. Foram encontradas 4 espécies de ácaros associadas aos histerídeos. A família Ascidae foi registrada como sendo nova associação com histerídeos no esterco de granjas. A prevalência de ácaros foréticos predominou em Hololepta quadridentata / Abstract: Animal production systems under confinement are artificial agroecosystems which favor the development of an exuberant arthropod fauna, due to their high manure offer. These environments may provide adequate survival conditions for a number of mites. The purpose of this work was to study the phoretic association dynamics between mites and predaceous coleopterans, also focusing on the occurrence and abundance of histerids-associated mite families, as well as their infrapopulations and infracommunities, related indexes of constancy, dominance and prevalence. The sampling methodology included hand-collected manure samples and pitfalltraps. Eight gathering activities occurred in different seasons in 2002, and 9 gathering activities during the period of 2001. Associated to histerids 4 mites species were found. A new association has been found between histerids and the Ascidae family in poultry farms manure. Phoretic mites prevalence was prevailing in Hololepta quadridentata / Mestrado / Parasitologia / Mestre em Parasitologia

1 Abstract: Multimodal signaling is quite common in nature. Even if we focus only on signaling among prey and its predator, we can still find many examples of communication combining more than one modality (vision, hearing, smell, taste). This thesis is about multimodal warning visual and olfactory signaling between true bugs (Heteroptera) and their avian predators. Aldehydes are an important compound of repellent secretion of most true bug species. They are considered to have defence effects against predators. In our experiments, we tested the effect of aldehydes mixture on behaviour of predators - naive hand-reared and experienced wild-caught adult great tits (Parus major) - towards several kinds of prey - aposematic true bugs Pyrrhocoris apterus, nonaposematic true bugs Pyrrhocoris tibialis and red painted mealworms (Tenebrio molitor larvae). We were focusing on the effect of aldehydes on initial reaction, learning process and predator's memory. Aldehydes elicited innate wariness in naive hand- reared great tits towards aposematic P. apterus, but not towards P. tibialis. Therefore it seems possible, that aldehydes act as a signal of unpalatability for naive predators, but only in multimodal combination with visual warning signal. Similar effect of aldehydes was not found in experiments with wild-caught...

Aposematic species of true bugs (Heteroptera) have multimodal signalization, which warns potential predators. This signalization consists of optical (coloration), chemical (unpalatable or repugnant substance) and acoustic (stridulation) warning signals. The aim of this thesis was to test whether the selected chemical substances have antipredatory function towards avian predators. Antipredatory function is anticipated in the chemical substances that form the majority in secretion in many taxa of true bugs (aldehydes and tridecane). In experiments with wild-caught great tits (Parus major) and blue tits (Cyanistes caeruleus) we tested if chemical substances and age of birds have influence on the latency related to the first manipulation with the prey. It was found that both species of tits reacted aversively to the mixture of aldehydes (2-decenal, 2-octenal, 2-hexenal) and to the total secretion of metathoracic glands of Graphosoma lineatum, whereas the mixture of the aldehydes with tridecane did not have any effect. The effect of age was not significant. We also tested the influence of immediate experience with striated shieldbug Graphosoma lineatum on naive great tits and their reactions to the prey with olfactoric signal of the shieldbug. Additionally, we investigated whether tested chemicals cause...

Some populations of newts (Taricha granulosa) possess large quantities of the neurotoxin tetrodotoxin (TTX) in their skin and eggs. Many populations of garter snake (Thamnophis sirtalis) are resistant to this toxin and can consume large numbers of newts with no negative effects. Despite the wealth of information acquired on the interaction between newts and their predator, garter snakes, very little research has been conducted on possible interactions between newts and other predators. I conducted a suite of experiments examining for the presence of other predators on newts, specifically focusing on predators of their eggs and larvae. I found a single predator, caddisfly larvae were capable of consuming the toxic eggs. Larval caddisflies are extremely abundant at one study site (775,000 caddisfly larvae per pond), and appear to be resistant to the negative effects of ingesting tetrodotoxin. After hatching, larval newts retain substantial quantities of TTX and most are unpalatable to predatory dragonfly naiads. Ovipositing female newts respond to the presence of caddisflies by depositing their eggs at the top of the water column where they are out of the reach of most predatory caddisflies. When caddisflies do consume a newt egg, some of the toxin is retained in their body tissues. Finally, caddisflies consume more newt eggs when those eggs contain less toxin versus eggs that contain large amounts of TTX. This may cause newt eggs that contain low quantities of TTX to more likely to die of predation which could ultimately drive an increase in toxicity of the adult population over time. Collectively, these findings indicate an additional player, caddisfly larvae, is a major predator of newts and could be involved in the evolution of tetrodotoxin toxicity in newts.

The Nilgiri tahr (Hemitragus hylocrius) is an endangered mountain ungulate endemic to the Western Ghats in South India. I studied the status and ecology of the Nilgiri tahr in the Mukurthi National Park, from January 1993 to December 1995. To determine the status of this tahr population, I conducted foot surveys, total counts, and a three-day census and estimated that this population contained about 150 tahr. Tahr were more numerous in the north sector than the south sector of the park. Age-specific mortality rates in this population were higher than in other tahr populations. I conducted deterministic computer simulations to determine the persistence of this population. I estimated that under current conditions, this population will persist for 22 years. When the adult mortality was reduced from 0.40 to 0.17, the modeled population persisted for more than 200 years. Tahr used grasslands that were close to cliffs (p <0.0001), far from roads (p <0.0001), far from shola forests (p <0.01), and far from commercial forestry plantations (p <0.001). Based on these criteria I mapped the suitability of tahr habitat using a GIS and estimated that only 20% of the park area had >50% chance of being used by tahr. I used the GIS to simulate several management options to improve the quality of tahr habitat. Suitable habitat for tahr increased two-fold when roads within the park were closed to vehicular access. Similarly, removal of commercial forestry plantations also resulted in a two-fold increase of suitable habitat, and finally when both road access was restricted and commercial forests were removed, suitable tahr habitat increased three-fold. I used micro-histological analysis on tahr fecal pellets to determine food habits. Grasses constituted 64.2% of their diet. Five plant species (Eulalia phaeothrix, Chrysopogon zeylanicus, Ischaemum rugosum, Andropogon sp., and Carex sp.) accounted for 84.6% of the tahr' diet. These species were found in higher densities in the grasslands of the north sector than the south sector of the park (p <0.001). Predators such as leopard (Panthera pardus) and tiger (Panthera tigris), killed and consumed tahr. Tahr constituted 56% of the leopards' diet and 6% of the tigers' diet. I estimated that leopards and tigers in the park killed and consumed 30 to 60 tahr per year, and this accounted for 19% to 38% of the tahr population. The tahr population in the park has undergone a decline, possible causes for this decline includes high mortality from predation and poaching and loss of habitat. / Ph. D.

We investigate an approach to apply Genetic Programming for the evolution of optimal escaping strategies of a team of caribou agents in the wolf-caribou predator prey problem (WCPPP) where the WCPPP is comprised of a team of caribou agents attempting to escape from a single yet superior (in terms of sensory abilities, raw speed, and maximum energy) wolf agent in a simulated twodimensional infinite toroidal world. We empirically verify our hypothesis that the incorporation of empathy in caribou agents significantly improves both the evolution efficiency of the escaping behavior and the effectiveness of such a behavior. This finding may be viewed as a verification of the survival value of empathy and the resulting compassionate behavior of the escaping caribou agents. Moreover, considering the fact that a single caribou cannot escape from the superior wolf, the ability of a team of empathic caribou agents to escape may also be viewed as an illustration of the emergent nature of a successful escaping behavior – in that the team-level properties are more than the mere sum of the properties of the individual entities. Within this context, we also present empirical results that verify the complex (nonlinear) nature of the relationship between the size of team of caribou agents and the efficiency of their escaping behavior. / 博士(工学) / Doctor of Philosophy in Engineering / 同志社大学 / Doshisha University

The interaction between pollinators and flowers affects the fitness of both pollinators and flowering plants, which can result in the co-evolution of pollinator and floral traits. Some pollination systems contain flower-dwelling ambush predators that attack visiting pollinators. This interaction could result in co-evolution of predator and pollinator traits as is typical in predator-prey systems. The presence of these predators could also have indirect negative fitness effects on flowering plants by killing or deterring pollinators. This raises the possibility that predator and floral traits also co-evolve. Furthermore, it is possible that this system is best described as a three-species game where predator, pollinator, and floral traits all co-evolve. The ultimate goal of my thesis is to explore this possibility. This is achieved in Chapter 5, which consists of a game theory model of the co-evolution of floral colour with predator and pollinator behavioural strategies. This model is novel, both within the pollination context described here and within a wider context. Furthermore this model is the first to propose that the evolution of floral colour might be affected by the presence of flower-dwelling ambush predators. This is particularly significant given that there has been little discussion about what floral traits might be adaptations to the presence of these predators. A secondary goal of this thesis is to explore how pollinators detect and respond to the presence of flower-dwelling ambush predators as an important subcomponent of predator-pollinator-flower co-evolutionary dynamic. Chapter 2 demonstrates that bumblebees avoid evidence of past predation events, and Chapter 3 demonstrates that the honeybee recruitment dance is affected by exposure to cues of predation risk in a way that should reduce the colony's exposure to predators. Chapter 4 is a model that suggests novel factors that might affect how a population of pollinators distributes itself between predator-free and predator-containing flowers. / Thesis / Doctor of Philosophy (PhD)

This research study was conducted to determine if there were significant differences or relationships between teachers' perceptions of knowledge of Internet dangers to students and factors such as demographics, self-reported comfort levels with Internet use, and with knowledge of policies and laws regarding Internet safety. Three hundred seventy-two teachers from three central Florida school districts were surveyed using an adapted survey developed by authors Patchin and Hinduja (2006) and Willard (2006, 2009). The world of the Internet is constantly changing, and students will encounter harassment and dangers while pursuing their interests on line. Recent research on the types of Internet dangers involving youth (Hinduja & Patchin, 2009; Juvonen & Gross, 2008, Leichtling, 2008; Lenhart, Madden & Hitlin, 2005; Li, 2007; Willard, 2009), and evidence supporting limited adult knowledge of Internet dangers to youth (Finkelhor, Mitchell & Wolak, 2000; Hinduja & Patchin, 2009; Patchin & Hinduja, 2006; Willard, 2006,2009) provided the conceptual framework for this study. Descriptive and inferential statistics were performed to investigate each research question. These statistics included one-way ANOVA, Scheffe post-hoc analysis, chi-square tests of independence, independent T-tests, and Kruskal-Wallis tests. These findings demonstrated that the null hypotheses were rejected for each research question. Significant differences were found between teachers' knowledge of Internet dangers and age, years of experience, level of school taught, and personal comfort with the Internet. Other significant relationships were found between personal Internet comfort and knowledge of laws and policies, specifically the Jeffrey Johnston Stand Up for All Students Act, and between male teachers and knowledge of victim behaviors. Gender was the only demographic variable found to be not significantly related to a teachers' knowledge of Internet dangers to students. The implications of these results validate the importance of more teacher training to increase knowledge of Internet dangers, policies and programs, as well as increase teachers' ability to identify victims and provide them with assistance. As technology expands, Internet dangers for children online expand and are a growing concern for parents, teachers, and administrators. Since technology will continue to grow, adults play a major role in educating children concerning the dangers of being online. However, adults struggle to play catch-up to the young digital natives, and are not really present to intervene when needed. We cannot cross the digital divide and help our students if we are not seeking out the information ourselves (Willard, 2009).