O-Ring Logistical Model

Gut parasite infection and pesticide exposure affect bumble bee health and pollination behavior. These stressors are common in commercial tomato greenhouses, where growers deploy bumble bees for pollination. To investigate the effects of these stressors on bumble bee pollination in greenhouses, we sampled commercial bumble bee colonies for the presence of three common gut-parasites (Crithidia, Apicystis, Nosema) within three commercial tomato greenhouses that were sampled during 12-week periods of two growing seasons. We then sampled the nest material of these same colonies to detect and quantify compounds that are active ingredients in pesticides. Using grower-collected data, we monitored tomato anther bruising as a proxy for bee pollination activity, and recorded pesticide applications within the greenhouses. We found that parasite infection prevalence was correlated with total pesticide application and bumble bee colony density, but these relationships were parasite-specific. Crithidia prevalence increased with total pesticide use and decreased with bumble bee colony density. Crithidia infection was also negatively associated correlated with decreased pollination activity. In contrast, Apicystis infection decreased with total pesticide use, but increased with colony density, and was positively associated with pollination activity. We never detected Nosema in any colony. Pollination activity was not directly predicted by pesticide quantity. Nest-compound exposure revealed frequent detection of multiple pesticide compounds. We further found compound-specific associations with pathogen infection probability. Our results highlight that gut parasites, as mediated through pesticide exposure, have important effects on bumble bee pollination, but these effects are pathogen- and pesticide-specific.

Ema Šimkovicová

A análise da interseção entre a Av. Ernesto Neugebauer e a R. Dona Teodora compara diferentes configurações semafóricas nos horários de pico. No cenário base, veículos vindos do Leste usam a mesma fase para seguir em frente ou converter à direita. No cenário proposto, esses movimentos passam a ter fases separadas, permitindo mais tempo de verde para a conversão à direita e aumentando a capacidade do fluxo da Rua Dona Teodora no sentido Leste–Oeste.

A Geospatial Analyst’s Workflow, Steps 1–6: Acquisition, Preprocessing, Exploratory Analysis, Association, Regression, and Validation

zadanie2

This report analyzes professional tennis match data extracted from the Live Tennis API Open Dataset. The analysis explores critical match dynamics, including comeback probabilities after losing the first set, service hold vs. break percentages across tour tiers, and sample size distributions.