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In this talk, I will discuss carbon, water, and energy exchanges from a tall, old-growth forest ecosystem. This well-studied forest has a complicated vertical structure, large aboveground biomass, and a great deal of epiphytic cover. My group has measured canopy temperatures and carbonyl sulfide (OCS) concentrations at this site to better understand the dynamics of leaf and canopy energy balance, photosynthesis, and conductance. Canopy photosynthesis is inferred from OCS fluxes and compared with estimates derived from eddy flux measurements.
Charles Darwin was a brilliant naturalist who recognized many biological connections through his observations of the natural world. Darwin would no doubt revel in our ability to draw biological inferences from DNA sequences. Of course, we also know that biological inference and biological content are easily conflated and that genomics can only take us so far without proper authentication via empirical biology.
Montane ecosystems of the Cascades Range provide a simple, naturally replicated system to test a wide range of evolutionary and ecological processes, from the origin of cold-specialized species to the role of ecological diversification in community assembly. My research focuses on groups of insects that are dispersal limited microhabitat specialists of snowfield and riparian ecosystems. Based on extensive sampling and genetic data, I discuss biogeographic models that explain the origin, current distribution and pattern of endemism in these insects.
Our understanding of food web dynamics has come a long way since Bob Paine reinvigorated the study of species interaction networks. Our mathematical theory for predator-prey interactions and food web stability in particular has progressed in leaps-and-bounds. Nevertheless, I will argue that we — as both theoreticians and empiricists — are largely ignoring the interactions of generalist predators by assuming that the (more feasible) study of specialist predators will suffice. Despite my academic grandfather’s call for man
The latitudinal gradient in species diversity is one of the most obvious ecological patterns on the planet, yet the mechanisms underlying this pattern remain unresolved and controversial. The fundamental problem relates to linking latitudinal variation in the environment to the processes that lead to the evolution of reproductive isolation and species formation.
The “bush tomatoes” (Solanum) of the Australian Monsoon Tropics continue to generate questions related to reproductive ecology, species boundaries, biogeography, and breeding systems evolution. This talk will summarize work done on this unusual group of plants in the Martine lab, often inclusive of undergraduate students, through a holistic research strategy that includes fieldwork, herbarium collections, greenhouse culture, and molecular approaches.
How predictable is nature? This question is central to ecology, regardless of whether the goal is to comprehend nature from an empirical perspective, to seek a more general theoretical understanding, or to provide practical insight into the management of natural systems. In the first part of this talk (Past) I introduce the PalEON project and discuss how millennial-scale hindcasts of the Northern US are being used to reconstruct presettlement conditions and validate terrestrial ecosystem models.