Seasonal selection is a general feature of Drosophila melanogaster genetic variation, occurring in North American and European populations and affecting large proportions of the genome.

Seasonal variation in resources causes opposing episodes of selection on body size, which interact with density dependence to influence population dynamics.

Phylogenetic and computational methods reveal that at least two seasonal coronaviruses are evolving adaptively in the region of the viral spike protein exposed to the human humoral immune system.

Observational field analyses demonstrate that within a species, variation in animal weapon size corresponds to individual differences in the costs and benefits of weaponry.

The combination of phenotypic measures of antigenic drift and genotypic measures of functional constraint improves the accuracy of long-term seasonal influenza A/H3N2 forecasts.

First influenza infections determine susceptibility to future seasonal influenza infection throughout life, and may impact vaccine effectiveness.

Antigenic drift in influenza’s major surface proteins, hemagglutinin and neuraminidase, contributes to variability in epidemic magnitude across seasons but is less influential than subtype interference in shaping annual outbreaks.

The timing of surveillance for pfhrp2/3-deletions within a transmission season impacts estimates of the proportion of false-negative RDTs due to deletions, which may cause premature decisions to change RDT.

Molecular analyses reveal the neuroendocrine control of seasonal life-history transitions in birds.

Four types of declarative memory rely on different weightings of similar component processes, according to fMRI and subjective ratings.