Apparent signal of competition limiting diversification after ecological transitions from marine to freshwater habitats

被引:91
作者
Betancur-R, Ricardo [1 ]
Orti, Guillermo [1 ]
Stein, Ariel M. [1 ]
Marceniuk, Alexandre P. [2 ]
Pyron, R. Alexander [1 ]
机构
[1] George Washington Univ, Dept Biol Sci, Washington, DC 20052 USA
[2] Fed Univ Para, Inst Estudos Costeiros, BR-68600000 Braganca, Para, Brazil
关键词
Adaptive radiation; Ariidae; disparification; diversification; ecological opportunity; freshwaters; habitat transitions; marine; morphological evolution; phylogeny; GEOGRAPHIC RANGE EVOLUTION; MODEL ADAPTIVE RADIATION; MOLECULAR PHYLOGENETICS; BODY-SIZE; OPPORTUNITY; FISHES; RATES; HISTORY; CONTINENTS; EXTINCTION;
D O I
10.1111/j.1461-0248.2012.01802.x
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Adaptive radiations are typically triggered when a lineage encounters a significant range of open niche space (ecological opportunity), stemming from colonisation of new areas, extinction of competitors or key innovations. The most well-known of these is the colonisation of new areas, through either dispersal into new regions or the invasion of novel ecological regimes. One aspect of ecological opportunity that has rarely been studied, however, is the extent to which pre-existent competitors act to limit diversification in newly colonised adaptive zones. Herein, we show that in multiple geographically independent invasions of freshwaters by marine Sea Catfishes (Ariidae), rates of both morphological disparification and lineage diversification are inversely related to the presence and diversity of other freshwater fish lineages. Only in one region (Australia-New Guinea) with an otherwise depauperate freshwater fauna, has an ariid invasion gained any substantial traction. This is true at both regional and community scales, suggesting that competitive constraints may be an important factor regulating adaptive radiation.
引用
收藏
页码:822 / 830
页数:9
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