"weak fitness" is a correct and usable phrase in written English
You can use it to describe someone who is not very physically fit. For example, "John has weak fitness due to his sedentary lifestyle."
However, our results suggest that competitive ability is a rather weak fitness component in nature.
Their functions might be subtle and related to a weak fitness in the wild.
HBLC patients have weak fitness and as a result the peripheral tissues need to increase their consumption of BCAA.
When the time limit was high, the previously neutral performance trade-off gave rise to a weak fitness trade-off.
Lastly, where selection on maladaptive gene complexes in hybridized populations is weak, fitness might not have returned to prehybridization levels.
Mutations with weak fitness effects respond to selection when the effective population size (N e ) is large, but evolve via genetic drift when N e is small.
Thus the population of P. ridibundus females grows and eventually out-competes the other species, despite the weaker fitness of P. ridibundus females compared both to P. esculentus (δ h =0.2) and to P. lessonae (δ e =0.2 and δ e =0.4), see Figure 2. Of course a population of only P. ridibundus females cannot survive.
The weak adjusted fitness of the highland maize in the midland site was strongly related to the low proportion of plants producing good quality seed under those conditions.
This suggests a weak metabolic fitness cost for the QS and contrasts with a deletion in the pfs gene, the enzyme upstream of luxS responsible for the degradation of SAH (fig. 1) that carries major fitness costs to the cell (fig. 3).
They subsequently concluded that a low heritability of FA or a weak FA-fitness association could still be the result of a much stronger effect in DI.
Weak links The fitness of Ryan Shawcross is a concern.
