Effects on coral populations but what is a coral

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Effects on coral populations – but what is a coral anyway (symbiotic mutualism) Scleractinian coral: polyp, builds skeleton from calcium carbonate (clear) Zooxantheallae: algae residing on coral scleractinian skeleton – provide energy source, mediates nutrient uptake. Provides colour Coral provides protection, supply of carbon dioxide, and energy at night through predation Bleaching – algae leave, or pigments are reduced Takeaways - Forest disturbances can vary by type, frequency, scale and intensity - Species composition, age and geography can affect disturbance impact and succession – abiotic and biotic factors - There are different models of succession – they each have value in giving explanation to patterns we see depending on the context - Disturbance is a critical part of ecosystem processes, evolution etc. – the spatial land temporal scale of the disturbance relative to the system processes is key - Don’t rule out micro-site influences Terms: disturbance, succession, primary succession, facilitation, chronosequence, tolerance model, inhibition model, random model. Concepts - Some ways to characterize disturbances - Some ways to observe succession - The different models of succession. Are there any examples you can describe to show where each theory can be observed? Some limitations of early theories? - Some disturbances an ecosystem may endure – some challenged or opportunities that they may create Midterm Review
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What is biogeography? :the study of the past and present geographic distribution of plants, animals and other organisms. It’s about understanding the patterns and processes that govern the distribution of life on Earth Ecological Biogeography - To understand the present distribution and variation of life Historical Biogeography - To understand the origins, distributions and extinction of life - As a result of interactions betwee life and their environments - Environments can be defined by abiotic (physical environment) or biotic characteristics Importance of Scale - Scale determines the lens that we view (understand) both environments and organisms Critical Foundations 1. Life on earth varies from one place to another 2. The variations we see have patterns - Non-random - Predictable Distribution and abundance (Both pattern and process) – global biodiversity Georges-Louis Leclerc, Comte de Buffon Refuted Linneaus: - Speculated that source of organisms was in N. Europe, species spread when conditions were favorable, then isolated with change in climate - Required species to migrate across inhospitable habitats - Different parts of globe (isolated regions) with similar climactic and environmental conditions often inhabited by distinct kinds of plants and animals – Buffon’s Law - Dynamic earth and climate - Dynamic species – they either improved or degenerated Developments in 1800’s : generalized morphogeographic rules (study of geographic variation and adaptation – physiological ecology and allometry). Endotherm vs ectotherm Bergmann’s Rule – endothermic (warm-blooded) races from cooler climates have larger body
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