Biological timing
Daily clocks, seasonal signals and the timing of emergence and dormancy.
6 problemsEcology
Interactions among organisms and their environments.
Collections
Browse collectionsEcosystems and their environment
Species interactions, geographic patterns, symbiotic partnerships and carbon moving through the ocean.
22 problemsSymbiosis
Recognizing a partner, building a shared body and maintaining a compartment inherited from a partner.
6 problemsA few problems to explore
21 totalLatitudinal diversity gradient
Many groups contain more species near the equator than near the poles. Which ecological and evolutionary processes generate this large-scale pattern?
Species coexistence
Many species persist together despite competing for resources. Which mechanisms keep any one competitor from excluding the others in real, changing ecosystems?
Mast seeding
Some plants produce huge seed crops together, then little for years. How do weather cues and stored resources set that rhythm?
Bacterial speciation
Bacteria exchange DNA across lineages. How do distinct evolutionary populations form and remain separate?
Rangeomorph nutrition
Rangeomorphs were branching Ediacaran organisms. How did they obtain nutrients in the deep-sea settings where some lived?
Polyploid establishment
A plant with extra chromosome sets may have few compatible mates. Which conditions let a new polyploid population persist?