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Christian Che-Castaldo

Christian Che-Castaldo
Mount St. Helens Institute

Doctor of Philosophy

About

28
Publications
2,151
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332
Citations
Introduction
Skills and Expertise
Education
August 2005 - July 2014
University of Maryland, College Park
Field of study
  • Behavior Ecology Evolution Systematics Program

Publications

Publications (28)
Article
Full-text available
Conservation of seabirds in remote polar regions requires accurate information on the location of breeding sites, which is often limited by logistical constraints of surveying large areas. On the Antarctic Peninsula, many seabird colonies are visited briefly but regularly by commercial cruise vessels, a platform from which we were able to collect p...
Article
Full-text available
The plant stress and plant vigor hypotheses are widely used to explain the distribution and abundance of insect herbivores across their host plants. These hypotheses are the subject of contentious debate within the plant herbivore research community, with several studies finding simultaneous support for both hypotheses for the same plant‐herbivore...
Article
Full-text available
Obtaining inferences on disease dynamics (e.g., host population size, pathogen prevalence, transmission rate, host survival probability) typically requires marking and tracking individuals over time. While multistate mark–recapture models can produce high-quality inference, these techniques are difficult to employ at large spatial and long temporal...
Article
Population forecasting, in which past dynamics are used to make predictions of future state, has many real-world applications. While time series of animal abundance are often modeled in ways that aim to capture the underlying biological processes involved, doing so is neither necessary nor sufficient for making good predictions. Here we report on a...
Article
Lack of demographic data for most of the world's threatened species is a widespread problem that precludes viability‐based status assessments for species conservation. A commonly suggested solution is to use data from species that are closely related or biologically similar to the focal species. This approach assumes that similar species and popula...
Article
Full-text available
Colonially-breeding seabirds have long served as indicator species for the health of the oceans on which they depend. Abundance and breeding data are repeatedly collected at fixed study sites in the hopes that changes in abundance and productivity may be useful for adaptive management of marine resources, but their suitability for this purpose is o...
Article
Conservation managers rely on accurate estimates of disease parameters, such as pathogen prevalence and infection intensity, to assess disease status of a host population. However, these disease metrics may be biased if low-level infection intensities are missed by sampling methods or laboratory diagnostic tests. These false negatives underestimate...
Article
The Mapping Application for Penguin Populations and Projected Dynamics (MAPPPD) is a web-based, open access, decision-support tool designed to assist scientists, non-governmental organisations and policy-makers working to meet the management objectives as set forth by the Commission for the Conservation of Antarctic Marine Living Resources (CCAMLR)...
Article
Full-text available
Emerging infectious diseases can cause host community disassembly, but the mechanisms driving the order of species declines and extirpations following a disease outbreak are unclear. We documented the community disassembly of a Neotropical tadpole community during a chytridiomycosis outbreak, triggered by the generalist fungal pathogen, Batrachochy...
Article
• Females often outnumber males in Salix populations, although the mechanisms behind female bias are not well understood and could be caused by both genetic and ecological factors. We investigated several ecological factors that could bias secondary sex ratios of Salix sitchensis colonizing Mount St. Helens after the 1980 eruption.• We determined w...
Presentation
Full-text available
Background/Question/Methods Sitka willow (Salix sitchensis) is a foundational species that has recently become common on primary successional sites of Mount St. Helens Pumice Plain, a 15 km2 landscape formed and sterilized by pyroclastic flows in 1980. Willow is the only common colonizing species with substantial vertical structure, providing hab...
Presentation
Background/Question/Methods Recent studies of primary succession on Mt. St. Helens have focused on the hypothesis that insect herbivory is a major factor influencing the pace and pattern of early primary succession, not a minor mechanism as implied in nearly all work to date. Evaluating this hypothesis necessitates collecting data on plant-insect...
Presentation
Background/Question/Methods Dioecious woody plants in riparian zones often exhibit highly biased sex ratios, which may be explained by sex differences in water use efficiency and resource requirements. The sex ratio in willows (Salix sitchensis) colonizing primary successional sites at Mount St. Helens is slightly biased (54% female), but highly b...
Article
One of the major challenges in managing the Colorado potato beetle, Leptinotarsa decemlineata (Say) is its remarkable ability to develop resistance to virtually every insecticide that has ever been used against it. Resistance is particularly common throughout northeastern USA as far north as Maine. The first instances of resistance to imidacloprid...
Article
This paper examines the diffusion paths of selected integrated pest management (IPM) techniques for 24 fruit crops in nine states, forecasts when the adoption of IPM techniques will reach 75% of the fruit-bearing acres, and examines the determinants of the rate of diffusion. The adoption of IPM techniques follows the logistic functional form and 75...

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