Phenotypic plasticity of Daphnia life history traits in response to predator kairomones: genetic variability and evolutionary potential

1997 ◽  
pp. 89-99
Author(s):  
Anke Weber ◽  
Steven Declerck
Keyword(s):  
Life History ◽  
Phenotypic Plasticity ◽  
Genetic Variability ◽  
Life History Traits ◽  
Evolutionary Potential

Genetic Variability in Two Tree Species, Acer platanoides L. and Betula pendula Roth, With Contrasting Life-history Traits

2003 ◽  
Vol 18 (4) ◽  
pp. 320-331 ◽  
Author(s):  
Gösta Eriksson ◽  
Sanna Black-samuelsson ◽  
Martin Jensen ◽  
Tor Myking ◽  
Mari Rusanen ◽  
...  
Keyword(s):  
Life History ◽  
Genetic Variability ◽  
Tree Species ◽  
Betula Pendula ◽  
Life History Traits ◽  
Acer Platanoides ◽  
Betula Pendula Roth

scholarly journals Phenotypic plasticity in fish life-history traits in two neotropical reservoirs: Petit-Saut Reservoir in French Guiana and Brokopondo Reservoir in Suriname

2009 ◽  
Vol 7 (4) ◽  
pp. 683-692 ◽  
Author(s):  
Bernard de Mérona ◽  
Jan Mol ◽  
Régis Vigouroux ◽  
Paulo de Tarso Chaves
Keyword(s):  
Life History ◽  
Phenotypic Plasticity ◽  
Fish Species ◽  
French Guiana ◽  
Life History Traits ◽  
Relative Length ◽  
Maximum Length ◽  
Batch Fecundity ◽  
Long Time ◽  
Petit Saut

Fish species are known for their large phenotypic plasticity in life-history traits in relation to environmental characteristics. Plasticity allows species to increase their fitness in a given environment. Here we examined the life-history response of fish species after an abrupt change in their environment caused by the damming of rivers. Two reservoirs of different age, both situated on the Guiana Shield, were investigated: the young Petit-Saut Reservoir in French Guiana (14 years) and the much older Brokopondo Reservoir in Suriname (44 years). Six life-history traits in 14 fish species were studied and compared to their value in the Sinnamary River prior to the completion of Petit-Saut Reservoir. The traits analyzed were maximum length, absolute and relative length at first maturation, proportion of mature oocytes in ripe gonad, batch fecundity and mean size of mature oocytes. The results revealed a general increase of reproductive effort. All species showed a decrease in maximum length. Compared to the values observed before the dam constructions, eight species had larger oocytes and three species showed an increased batch fecundity. These observed changes suggest a trend towards a pioneer strategy. The changes observed in Petit-Saut Reservoir also seemed to apply to the 30 years older Brokopondo Reservoir suggesting that these reservoirs remain in a state of immaturity for a long time.

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