from Part V - Effects Due to Invading Species, Habitat Loss and Climate Change
Published online by Cambridge University Press: 05 March 2013
Episodic processes and faunal structure
Episodes of ecological perturbation and faunal turnover represent crises for global biodiversity and have occurred periodically across Earth’s history on a continuum linking deep evolutionary and shallow ecological time (Briggs, 1995; Hallam & Wignall, 1997; Hoberg & Brooks, 2008; Stigall, 2010). Major extinction events and biodiversity crises across the 540 million years of the Phanerozoic are equated with periods of maximum ecological disruption associated with geological, oceanographic and atmospheric (climatological) mechanisms which have influenced patterns and processes for diversification (dispersal and isolation), species diversity, community and faunal structure, turnover, and distribution on global to regional and landscape scales (Briggs, 1995; Stigall, 2012a, 2012b). Episodic or punctuated events set the stage for patterns of diversification and faunal associations downstream for extended periods of time (Eldredge & Gould, 1972; Eldredge et al., 2005). In essence, the cascading effects of ecological disruption may canalize faunal structure, eliminating evolutionary potential through differential extinction events, but concurrently may heighten faunal mixing and interchange through breakdown in ecological isolation during biotic expansion and geographic colonization (Rode & Lieberman, 2005; Hoberg & Brooks, 2010). Paradoxically, ecological crises may also be precursors for subsequent radiation and diversification in taxa which have persisted through events of maximal ecological perturbations (e.g., Hoberg & Brooks, 2008), and elevated rates for speciation are often linked to periods of rapid climatological and environmental change (Vrba, 1996). These processes and their influence on faunal structure and diversity are equivalent in evolutionary and ecological time and thus can serve as analogs for understanding and predicting the general outcomes of invasion and range shifts in contemporary communities and faunas (Hoberg, 2010; Hoberg & Brooks, 2010; Peterson, 2011; Stigall, 2012b).
To save this book to your Kindle, first ensure [email protected] is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.
Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.
Find out more about the Kindle Personal Document Service.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Dropbox.
To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.