Filters: Tags: Evolutionary Ecology (X)
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A central question of invasion biology is how an exotic species invades new habitats following its initial establishment. Three hypotheses to explain this expansion are: (1) the existence of ‘general purpose’ genotypes, (2) the in situ evolution of novel genotypes, and (3) the dispersal of existing specialized genotypes into habitats for which they are pre-adapted. Bromus tectorum is a selfing exotic winter annual grass that has achieved widespread dominance in semiarid western North America and that is actively invading salt desert habitats. We examined mechanisms driving this invasion in three complementary studies. In reciprocal seeding experiments with ten populations from saline playa, salt desert shrubland,...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Evolutionary Ecology,
SSR marker,
cheatgrass,
downy brome,
invasion,
Related plants often produce seeds that are dispersed in very different ways, raising questions of how and why plants undergo adaptive shifts in key aspects of their reproductive ecology. Here we analyze the evolution of seed dispersal syndromes in an ancient group of plants. Ephedra (Gymnospermae; Gnetales; Ephedraceae) is a genus containing &50 species in semiarid ecosystems worldwide and with three distinct types of cones. We collected mature cones and seeds of ten species of Ephedra in southwestern United States and measured nine morphological traits for each species. Principal component analysis and other data characterized three types of Ephedra cones and seeds. Species with dry, winged cone bracts are dispersed...
Categories: Publication;
Types: Citation,
Journal Citation;
Tags: Evolutionary Ecology,
endozoochory,
frugivory,
rodent caching,
scatter hoarding,
Categories: Publication;
Types: Citation;
Tags: Climate-change ecology,
Ecological genetics,
Evolutionary Ecology,
Fish,
Invasive species,
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