Examples of facultative

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Separating facultative wheat environments from true winter wheat environments remains problematic.
These habitats are usually considered as nutrient poor14,15, giving rise to the need for obligate and facultative symbiotic interactions between coexisting organisms and epiphytes.
Furthermore, the apparently facultative loss of canopy in partly deciduous species is best explained as a direct response to moisture stress.
In these cases, the bees may be opportunistic visitors or facultative pollinators.
Alternatively the effects may be a result of some facultative response to environmental cues to optimize the ability to exploit any resource peaks.
In the case of some and probably most males and females, facultative responsiveness makes great evolutionary sense.
Direct evidence for facultative adoption of less prudent host exploitation strategies (which require that new parasites can detect existing infections) has been difficult to obtain.
Were that the case, one might again expect genes that fostered fixed mating strategies as well as facultative ones.
Why facultative progenesis is not more widespread remains a mystery.
We propose a heuristic explanation for cycling under facultative selfing and discuss its possible relevance.
The paper covers all types of wheat including bread and durum, as well as winter, facultative and spring wheat.
The question is then: why has facultative progenesis not evolved in all trematodes?
This alleged facultative phytophagy in soldier bugs should reflect the composition of digestive enzymes produced by these predators with a mixed diet.
Work is underway to apply cluster analysis on site-specific agroclimatic data to identify criteria that better distinguish among spring, facultative and winter wheat environments.
Thus even in the absence of facultative alterations in parasite reproductive rates, mixed-strain infections may be more virulent than single-strain infections.
Cycling under facultative selfing is caused by the following mechanism.
But one other dimension also has an explanation in terms of frequency, namely facultative expression.

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