Behavioural syndromes may either indicate constraints to the independent evolution of behaviours or suites of functionally integrated behaviours favoured by selection [ 12], i.e. coping strategies.
This set a relationship between the maximum long shoot number and the overall branch size, and may indicate allometric constraints to the way a tree is constructed.
Lack of evidence of random assortment between two loci may indicate functional constraints on the CSP protein that limit the possible amino acid combinations that are viable.
Consistent relationships may indicate physiological constraints, while labile relationships could have different interpretations depending on the organizational level (e.g. species-specific selection pressures, individual-specific immune strategies, season-specific responses).
This may indicate credit constraint issues, but also is consistent with a price effect from the lowering of the ' opportunity cost' of staying on.
Thus, the increasing influence of mutation drift on codon usage along the clade may indicate gradually relaxed constraints and reduced expression levels on the rbcL gene, finally correlating with a loss of photosynthesis in the colorless Cryptomonas paramaecium strains.
Sequence conservation among different species, especially species that are set apart by hundreds of million years of evolution, may indicate strong selection constraint and probably functional implications.
Such a selection pressure may indicate that strong functional constraints have a bearing on the evolution of the C2-PLDs, supporting the notion that this group of the PLDs have important and essential roles in the regulation of plant cellular processes.
This conservation of vif motifs may indicate a significant evolutionary constraint that has been operating on this viral gene even among distinct lineages.
The semi-dispersed gene cluster seen in Drosophila and T. castaneum may indicate that the functional constraint holding lozenge in the gene cluster has been lost or modified in the Coleopteran and Dipteran lineages.
