Cladogenesis
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Cladogenesis is an evolutionary splitting event in which each branch and its smaller branches forms a "clade", an evolutionary mechanism and a process of adaptive evolution that leads to the development of a greater variety of sister organisms. This event usually occurs when a few organisms end up in new, often distant areas or when environmental changes cause several extinctions, opening up ecological niches for the survivors. A great example of cladogenesis today is the Hawaiian archipelago, to which stray organisms traveled across the ocean via ocean currents and winds. Most of the species on the islands are not found anywhere else on Earth due to evolutionary divergence.
Cladogenesis is often contrasted with anagenesis, where gradual changes in an ancestral species lead to its eventual "replacement" by a novel form (i.e., there is no "splitting" of the phylogenetic tree).
Basic topics in evolutionary biology | |
|---|---|
| Evidence of evolution | |
| Processes of evolution | adaptation · macroevolution · microevolution · speciation |
| Population genetic mechanisms | natural selection · genetic drift · gene flow · mutation |
| Evolutionary developmental biology (Evo-devo) concepts | phenotypic plasticity · canalisation · modularity |
| Modes of evolution | anagenesis · catagenesis · cladogenesis |
| History | History of evolutionary thought · Charles Darwin · The Origin of Species · modern evolutionary synthesis · Evolutionary history of life |
| Other subfields | ecological genetics · human evolution · molecular evolution · phylogenetics · systematics |
| List of evolutionary biology topics · Timeline of evolution | |
