Indietroquiz 5
Termini in questo insieme (18)
phylogenetic diversity
the sum of branch lengths on a phylogenetic tree, measuring total evolutionary history
functional diversity
ecological distinctiveness of the community diversity of functional groups. the diversity of ecological roles and biological traits present in an ecosystem
facilitation
buffers against harsh environmental conditions and modifying local microclimates
resilience
measures how fast an ecosystem can recover after a disturbance
resistance
measures the ability of an ecosystem to remain unchanged after a disturbance
high resistance + high resilience =
high stability
ecosystem services
the direct and indirect benefits that humans receive from ecosystems
provisioning services
direct benefits gained by harvesting raw materials from ecosystems
regulating services
indirect benefits received from natural processes of ecosystems
cultural services
the direct and indirect benefits received from human interaction with ecosystems
supporting services
indirect processes that enable other ecosystem services
biogeography
variation in species diversity and distribution across the area
energy hypothesis
more solar energy per unit area in tropics, more photosynthesis results in higher NPP, supports more complex food webs and species
earth history hypothesis
based on patterns of continental drift, tropics are oldest, more species originated in the tropics, niche conservatism
evolutionary history hypothesis
low seasonality in the tropics which leads to faster generation times, faster generation times increases the speciation rate, more diversification=more species, low seasonality=decreased niche size
ecological interactions hypothesis
lack of seasonality increases specialization, increased specialization reduces average niche space, allowing more species to use resources
background extinction
lower average rate of extinction observed from regular evolutionary ecological processes
mass extinction
the rapid extinction of many diverse species around the world