Phenological-synchrony
Guides
Dieunomia
Dieunomia is a genus of sweat bees in the family Halictidae, containing approximately nine described species. These bees are among the largest in their family, second only to the genus Nomia. They are relatively uncommon and exhibit specialized ecological relationships with their pollen sources.
Dieunomia triangulifera
Dieunomia triangulifera is a solitary sweat bee (Halictidae) specialized on sunflower pollen. It occurs in the central United States, where it forms large nesting aggregations of up to 150,000 nests. The species exhibits tight phenological synchrony with its host plant Helianthus annuus, emerging and provisioning nests to coincide with peak pollen availability. Males engage in attempted forced matings at emergence, while actual courtship occurs later.
Zeiraphera
larch bud moths, spruce bud moths
Zeiraphera is a genus of tortricid moths in the subfamily Olethreutinae, comprising approximately 35 described species distributed across the Holarctic region. The genus includes economically significant forest pests, notably the larch bud moth (Z. diniana) and spruce bud moth (Z. canadensis), which undergo periodic population outbreaks causing defoliation of coniferous hosts. Several species exhibit complex ecological traits including host race formation, pheromone polymorphism, and long-distance wind-mediated dispersal. The genus is characterized by larval feeding on conifer needles and a tendency toward cyclic population dynamics in certain species.