A B S T R A C TBackground: Increasing evidence indicates that climate change is affecting the timing of pollen season and concentrations of allergenic pollens. To date, pollen trends and their associations with meteorological variables have not been studied in most of the United States. Objective: The purpose of this study was to investigate the effects of weather and climate on pollen concentrations and pollen season timing in Denver, Colorado. Methods: We retrospectively analyzed tree, grass, and weed pollen counts and meteorological variables from 2010-2018 using linear and Poisson regression models. Results: Pollen season timing did not demonstrate uniform trends from 2010 to 2018. Certain species demonstrated earlier season start dates (linden, oak) or end dates (birch, maple), and others had later end dates (oak, grass). Only a few species demonstrated changes in season duration (linden, oak, maple, birch) and peak date (maple, birch). Pollen concentrations either remained stable or increased over the years. Temperature and carbon dioxide levels increased over the study period, with the exception of decreased temperature in August. Wind speed remained stable or decreased over the study period. Conclusion: This study illustrates the complex interactions between pollens and meteorology. Meteorological variables associated with climate change do appear to affect allergenic pollens, though the relationship is variable both amongst pollens and from year to year.
Die Population des Grauspechts (Picus canus) ist seit den 1990er-Jahren in der Schweiz um zwei Drittel zurückgegangen, weshalb er seit 2021 auf der Roten Liste als stark gefährdet geführt wird. Die Ursachen für den markanten Populationsrückgang sind bislang jedoch unklar. Um mehr über seine Habitatansprüche zu erfahren, wurden im Schweizer Jura in den Jahren 2020 bis 2022 insgesamt 55 Grauspecht-Individuen besendert. In diesem methodischen Beitrag stellen wir vor, wie wir mithilfe von Telemetriedaten und hochaufgelösten Fernerkundungsdaten ein Modell zur kleinräumigen Habitatpräferenz während der Brutzeit erstellen werden. Die in diesem Projekt gewonnenen Erkenntnisse sollen dabei helfen, Massnahmen für die Erhaltung und die Förderung dieser heimlichen Spechtart zu erarbeiten.
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