Sex-specific difference in migration schedule as a precursor of protandry in a long-distance migratory bird

Pedersen, Lykke; Jakobsen, Nina Munkholt; Strandberg, Roine; Thorup, Kasper; Tøttrup, Anders P.

doi:10.1007/s00114-019-1637-6

Cited by 10 publications

(6 citation statements)

References 75 publications

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“…Cownose rays are not known to undertake a resting period between pregnancies (Poulakis 2013), and our data suggest males may travel into the upper regions of the Chesapeake Bay around the time of parturition by females, potentially improving access to mating opportunities. This behavior is in direct contrast to breedingrelated sex-specific migration behavior seen in birds, for which the earlier arrival of males at breeding grounds compared to females is much more prevalent (Pedersen et al 2019). However, this is likely related to differences in physiology of reproduction between groups.…”

Section: Discussionmentioning

confidence: 88%

Environmental associations of cownose ray (Rhinoptera bonasus) seasonal presence along the U.S. Atlantic Coast

et al. 2021

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Identifying the mechanistic drivers of migration can be crucial in shaping conservation and management policies. The cownose ray (Rhinoptera bonasus) is a relatively poorly understood elasmobranch species that occurs along the U.S. Atlantic coast and undergoes large-scale seasonal migrations. To better understand the drivers and timing of cownose ray seasonal migration in order to inform potential management measures, we analyzed telemetry detections of 51 mature cownose rays (38 female, 13 male) tagged with acoustic transmitters in the Maryland and Virginia portions of Chesapeake Bay. Detections within their summer habitat in Chesapeake Bay and winter habitat in the vicinity of Cape Canaveral, Florida, were matched with publicly available sea surface temperature (SST) data recorded by data buoys near the areas of tag detections and with local photoperiod and day of year. These variables were used in boosted regression tree models of ray presence (all rays combined, females only, and males only) in each seasonal habitat. Models were developed for presence during the entire summer and winter season, and for the time periods of arrival and departure from both summer and winter habitats. Seasonal presence in both summer and winter habitats was associated with distinct temperature, photoperiod, and date ranges, with temperature as the most influential variable in seasonal models. In models of arrival and departure periods, southward migration (departure from Chesapeake Bay and arrival off Cape Canaveral) was strongly associated with SST for all rays and arrival in the Chesapeake Bay region after northward migration was most strongly associated with day of year. The most influential variable during the period of northward departure from Cape Canaveral differed between males (day of year) and females (SST). This suggests that mature female northward migration may be driven by temperature while male northward migration may be driven by endogenous cues. These findings provide detailed information on the timing of cownose ray arrival at, presence in, and departure from seasonal habitats and provide potential justification for including the species in cross-taxa comparative studies on migratory behavior.

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Section: Discussionmentioning

confidence: 88%

Environmental associations of cownose ray (Rhinoptera bonasus) seasonal presence along the U.S. Atlantic Coast

et al. 2021

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“…An endogenous basis for protandry has been demonstrated in laboratory studies, where it has been shown that males exhibit spring migratory activity (“zugunruhe”) before females in response to photoperiod cues (Coppack & Pulido, 2009; Terrill & Berthold, 1990; Widmer, 1999) and even under constant photoperiod and environmental conditions (Maggini & Bairlein, 2012). In addition, light‐level geolocators have shown that males initiate spring migration before females and that this is the reason for their earlier arrival at breeding grounds, giving support for the existence of a sex‐differential selection pressure operating on spring migration (Briedis et al, 2019; Pedersen et al, 2019; Schmaljohann et al, 2016). Recently, candidate genes for sex‐specific timing of migration were identified in the willow warbler (Bazzi et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

Increase in protandry over time in a long‐distance migratory bird

Hedlund

Fransson

Kullberg

et al. 2022

Ecology and Evolution

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Protandry is a widespread life‐history phenomenon describing how males precede females at the site or state of reproduction. In migratory birds, protandry has an important influence on individual fitness, the migratory syndrome, and phenological response to climate change. Despite its significance, accurate analyses on the dynamics of protandry using data sets collected at the breeding site, are lacking. Basing our study on records collected during two time periods, 1979 to 1988 and 2006 to 2016, we aim to investigate protandry dynamics over 38 years in a breeding population of willow warblers (Phylloscopus trochilus). Change in the timing of arrival was analyzed in males and females, and protandry (number of days between male and female arrival) was investigated both at population level and within breeding pairs. Our results show advancement in the arrival time at the breeding site in both sexes, but male arrival has advanced to a greater extent, leading to an increase in protandry both at the population level and within breeding pairs. We did not observe any change in sex ratio that could explain the protandry increase, but pronounced temperature change has occurred and been reported in the breeding area and along the migratory route. Typically, natural selection opposes too early arrival in males, but given warmer springs, this counteracting force may be relaxing, enabling an increase in protandry. We discuss whether our results suggest that climate change has induced sex‐specific effects, if these could be evolutionary and whether the timing of important life‐history stages such as arrival at the breeding site may change at different rates in males and females following environmental shifts.

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“…Tracking data from the southern Scandinavian and Spanish population (30 individuals, 45 tracks) have been analysed before and published with a different purpose (Tøttrup et al , b, , Pedersen et al , ). Data used in the current study are available from the Movebank Data Repository: (https://doi.org/10.5441/001/1.4bt7365c) (Pedersen et al ).…”

Section: Methodsmentioning

confidence: 99%

Remarkably similar migration patterns between different red‐backed shrike populations suggest that migration rather than breeding area phenology determines the annual cycle

Pedersen

Onrubia

Vardanis

et al. 2020

Journal of Avian Biology

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The regular fluctuation of resources across the Globe guides movements of migratory animals. To ensure sufficient reproductive output and maintain viable population sizes, migratory animals should match arrival at breeding areas with local peaks in resource availability. It is generally assumed that breeding phenology dictates the timing of the annual cycle, but this is poorly studied. Here, we use light-level geolocator tracking data to compare the annual spatiotemporal migration patterns of a longdistance migratory songbird, the red-backed shrike, Lanius collurio, breeding at widely different latitudes within Europe. We find that populations use remarkably similar migration routes and are highly synchronized in time. Additional tracks from populations breeding at the edges of the European range support these similar migration patterns. When comparing timing of breeding and vegetation phenology, as a measure of resource availability across populations, we find that arrival and timing of breeding corresponds to the peak in vegetation greenness at northern latitudes. At lower latitudes birds arrive simultaneously with the more northerly breeding populations, but after the local greenness peak, suggesting that breeding area phenology does not determine the migratory schedule. Rather, timing of migration in red-backed shrikes may be constrained by events in other parts of the annual cycle.

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Sex-specific difference in migration schedule as a precursor of protandry in a long-distance migratory bird

Cited by 10 publications

References 75 publications

Environmental associations of cownose ray (Rhinoptera bonasus) seasonal presence along the U.S. Atlantic Coast

Environmental associations of cownose ray (Rhinoptera bonasus) seasonal presence along the U.S. Atlantic Coast

Increase in protandry over time in a long‐distance migratory bird

Remarkably similar migration patterns between different red‐backed shrike populations suggest that migration rather than breeding area phenology determines the annual cycle

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