Rapid growth, early maturation and short generation time in African annual fishes

EvoDevo

Martin Reichard¹  Matej Polačik¹  Radim Blažek¹ 

[1] Institute of Vertebrate Biology, Academy of Sciences of the Czech Republic, Květná 8 60365, Brno, Czech Republic

关键词: Savanna;    Reaction norm;    Vertebrate;    Diapause;    Killifish;    Generation time;    Rapid maturation;    Explosive growth;    Annual fish;    Extreme life history;   

Others  :  806296
DOI  :  10.1186/2041-9139-4-24

 received in 2013-03-19, accepted in 2013-06-27,  发布年份 2013

【 摘 要 】

Background

Extreme environmental conditions can give rise to extreme adaptations. We document growth, sexual maturation and fecundity in two species of African annual fish inhabiting temporary savanna pools.

Results

Nothobranchius kadleci started to reproduce at the age of 17 days and size of 31 mm and Nothobranchius furzeri at 18 days and 32 mm. All four study populations demonstrated rapid growth rates of up to 2.72 mm/day (23.4% of their total length). Both species may produce diapausing embryos or embryos that are able to hatch in as few as 15 days, resulting in a minimum generation time as short as only one month. Incubation on the surface of damp peat moss results in high embryo survival (73%) and a high proportion of rapidly developing embryos (58%) that skip diapauses and hatch in less than 30 days. We further demonstrated that rapid growth and maturation do not compromise subsequent fecundity.

Conclusions

Our data suggest that both species have the most rapid sexual maturation and minimum generation time of any vertebrate species, and that rapid maturity does not involve paedogenesis.

【 授权许可】

   
2013 Blažek et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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