A5065334236- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Geophysics and Gravity Measurements
- Animal Ecology and Behavior Studies
- Isotope Analysis in Ecology
- Ecology and Vegetation Dynamics Studies
- Fire effects on ecosystems
- Soil Carbon and Nitrogen Dynamics
- Wildlife Ecology and Conservation
- Forest Ecology and Biodiversity Studies
- Pacific and Southeast Asian Studies
University of Alberta
2023
University of Cape Town
2020-2021
Auckland University of Technology
2016-2017
Responses of the terrestrial biosphere to rapidly changing environmental conditions are a major source uncertainty in climate projections. In an effort reduce this uncertainty, wide range global change experiments have been conducted that mimic future ecosystems, manipulating CO2 , temperature, and nutrient water availability. Syntheses results across provide more general sense ecosystem responses change, help discern influence background such as vegetation type determining responses....
Abstract Burrowing seabirds that nest on islands transfer nutrients from the sea, disturb soil through burrowing, damage tree foliage when landing, and thereby modify surface litter. However, are in decline worldwide, as their community‐ ecosystem‐level impacts, primarily due to invasive predatory mammals. The direct indirect effects of seabird communities ecosystems inherently complex. Here we employed network analysis, a means simplifying ecological complexity, better understand loss may...
The progressive removal of invasive mammals from the Mercury Islands has led to over 25 years field study designed test processes restoration and natural recovery these seabird-driven island ecosystems.Resulting this work, four key questions can now be identified as fundamental designing programmes.The are: what is regional context (biogeography); how does each ecosystem operate (ecosystem function); have species changed (response effects); progress towards a goal defined (outcome...
Fire and herbivory are important natural disturbances in grassy biomes. Both drivers likely to influence belowground microbial communities but no studies have unravelled the long-term impact of both fire on bacterial fungal communities. We hypothesized that soil change through disturbance-induced shifts properties (e.g. pH, nutrients) while vegetation modification (biomass species composition). To test these ideas, we characterised physico-chemical (pH, acidity, C, N, P exchangeable cations...
Soil arthropods are important components of savannas, contributing to nutrient cycling and thus primary productivity. To investigate how fire mammalian herbivores influence arthropod food webs, we used two long term herbivore exclosures (ca. 20 y) burning trials 5-y return) located along rivers in Kruger National Park, South Africa. Herbivory will usually have negative effects on soil although this can be variable, dependent multiple aspects habitat structure cycling. We hypothesised that...