Details

Autor(en) / Beteiligte

• Gómez-Bahamón, Valentina
• Márquez, Roberto
• Jahn, Alex E.
• Miyaki, Cristina Yumi
• Tuero, Diego T.
• Laverde-R, Oscar
• Restrepo, Silvia
• Cadena, Carlos Daniel

Titel

Speciation Associated with Shifts in Migratory Behavior in an Avian Radiation

Ist Teil von

• Current biology, 2020-04, Vol.30 (7), p.1312-1321.e6

Ort / Verlag

England: Elsevier Inc

Erscheinungsjahr

2020

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• Migratory animals move up to thousands of kilometers every year [1]. Losses of migration (i.e., migratory drop-offs) occur when individuals of a migratory species stop migrating and establish founder sedentary populations, a phenomenon documented in birds [2–5] and butterflies [6]. In theory, losses—and also gains—of migration might promote speciation if sedentary and migratory populations become reproductively isolated [7–9]. Because migratory and sedentary strategies involve alternative physiological, behavioral, and morphological traits [10–13], divergence along multiple axes of organismal function is expected to accompany switches in migratory behavior, potentially accelerating speciation. We present evidence of speciation driven by a migratory drop-off in the fork-tailed flycatcher (Tyrannus savana) resulting in reproductive isolation likely driven by changes in breeding schedules (allochronic speciation [13–15]) and geographic isolation of breeding grounds (allopatric speciation [16]). Phylogenetic analyses across New World flycatchers (Tyrannidae) showed that an association between speciation and drop-offs is also observable at a macroevolutionary scale. Loss of migration was significantly more frequent than its gain, and speciation rates of migratory and partially migratory lineages (i.e., species having both migratory and sedentary populations) exceeded those of sedentary lineages. Models of trait evolution indicated that partial migration is an intermediate step between migratory and sedentary states in this family. Given that partial migration is widespread across migratory animals (e.g., of all migratory birds, ca. 51% are partially migratory [5]), speciation via switches in migratory behavior might be an important yet overlooked mechanism of animal diversification. •Loss of migration promoted speciation in fork-tailed flycatchers (Tyrannus savana)•Divergence is associated with the presence or absence of migratory behavior•Loss of migration resulting in speciation has likely happened across flycatchers Gómez-Bahamón et al. show that speciation is associated with changes in migratory behavior in fork-tailed flycatchers (Tyrannus savana). Divergence occurred through loss of migratory behavior of a single lineage. This mode of speciation likely occurred across New World flycatchers (Tyrannidae).