Island- and lake-like parallel adaptive radiations replicated in rivers.
Proc Biol Sci
; 285(1870)2018 01 10.
Article
in En
| MEDLINE
| ID: mdl-29298932
ABSTRACT
Parallel adaptive radiations have arisen following the colonization of islands by lizards and lakes by fishes. In these classic examples, parallel adaptive radiation is a response to the ecological opportunities afforded by the colonization of novel ecosystems and similar adaptive landscapes that favour the evolution of similar suites of ecomorphs, despite independent evolutionary histories. Here, we demonstrate that parallel adaptive radiations of cichlid fishes arose in South American rivers. Speciation-assembled communities of pike cichlids (Crenicichla) have independently diversified into similar suites of novel ecomorphs in the Uruguay and Paraná Rivers, including crevice feeders, periphyton grazers and molluscivores. There were bursts in phenotypic evolution associated with the colonization of each river and the subsequent expansion of morphospace following the evolution of the ecomorphs. These riverine clades demonstrate that characteristics emblematic of textbook parallel adaptive radiations of island- and lake-dwelling assemblages are feasible evolutionary outcomes even in labile ecosystems such as rivers.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Adaptation, Biological
/
Cichlids
/
Rivers
/
Biological Evolution
Limits:
Animals
Country/Region as subject:
America do sul
/
Uruguay
Language:
En
Journal:
Proc Biol Sci
Journal subject:
BIOLOGIA
Year:
2018
Document type:
Article
Affiliation country:
Estados Unidos