Sentence examples for facultative in from inspiring English sources

This behaviour may be continuous in some species subjected to low oxygen concentrations and high water temperatures, or facultative in species subjected to occasional conditions unfavourable for aquatic respiration.

Nevertheless, the frequent coexistence of matures with two or more other adult voles of the opposite sex, and even the cohabitation of one male with two pregnant females, suggest that monogamy was facultative in our population.

More recently derived associations are typically facultative in nature; in these cases bacterial symbionts often provide ancillary benefits such as protection from natural enemies or enhanced tolerance towards conditional environmental stresses [18].

With one exception, Drosophila mangabeirai, parthenogenetic development is facultative in all species where it is observed.

In a similar way, Haeckel agreed that bounding membranes were facultative in protists [ 12, 32].

In contrast, other S/MARs appear to be transient and facultative in their attachment to the NM.

Relaxing both assumptions, we show that a genotype with facultative delay in reproduction in response to cues predicting population decline can invade a population of first-year reproducers and that facultative delay is an evolutionarily stable strategy (ESS).

Enzymes in the fermentation pathway such as the phosphotransferase system IIA, IIB and IIC components, form a connected component in the facultative network, in combination with COG3091, an uncharacterized protein conserved primarily within the Bacilli.

The results provide a suggested regional design parameter for facultative ponds in this region in terms of domestic wastewater.

H3K36me3 is mostly studied in the context of actively transcribed genes, but was recently suggested to be enriched in constitutive and facultative heterochromatin in mouse cells.

In summation, the functions of facultative symbionts in the guts of animals remain poorly understood, but it appears that even loose associations of individual hosts with specific bacteria can result in dramatically different host phenotypes.