Tropical cyclones alter short-term activity patterns of a coastal seabird

Wilkinson, Bradley P.; Satgé, Yvan G.; Lamb, Juliet S.; Jodice, Patrick G. R.

doi:10.1186/s40462-019-0178-0

Cited by 15 publications

(9 citation statements)

References 43 publications

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“…The copyright holder for this preprint (which this version posted April 10, 2022. ; https://doi.org/10.1101/2022.04.07.487409 doi: bioRxiv preprint relation to storms have avoided the strongest winds, either by remaining on or close to land in the case of pelicans, juvenile frigate birds and boobies (11,16), or by circumnavigating the storm system (11,16), in agreement with optimal navigation theory (17).…”

Section: Discussionmentioning

confidence: 52%

Pelagic seabirds reduce risk by flying into the eye of the storm

Lempidakis

Shepard

Ross

et al. 2022

Preprint

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Cyclones can cause mass mortality of seabirds, sometimes wrecking thousands of individuals. The few studies to track pelagic seabirds during cyclones show they tend to circumnavigate the strongest winds. We tracked adult shearwaters in the Sea of Japan over 11 years and find that the response to cyclones varied according to the wind speed and direction. In strong winds, birds that were sandwiched between the storm and mainland Japan flew away from land and towards the eye of the storm, flying within ≤ 30 km of the eye and tracking it for up to 8 hours. This exposed shearwaters to some of the highest wind speeds near the eye wall (≤ 21 m s-1), but enabled them to avoid strong onshore winds in the storm's wake. Extreme winds may therefore become a threat when an inability to compensate for drift could lead to forced landings and collisions. Birds may need to know where land is in order to avoid it. This provides additional selective pressure for a map sense and could explain why juvenile shearwaters, which lack a map sense, instead navigating using a compass heading, are susceptible to being wrecked. We suggest that the ability to respond to storms is influenced by both flight and navigational capacities. This may become increasingly pertinent due to changes in extreme weather patterns.

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Section: Discussionmentioning

confidence: 52%

Pelagic seabirds reduce risk by flying into the eye of the storm

Lempidakis

Shepard

Ross

et al. 2022

Preprint

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“…Tracking of brown pelicans in the SAB has indicated that foraging adults rarely occur in waters further than 5–10 km offshore, instead relying on estuarine and nearshore environments rather than on pelagic systems for prey acquisition (Poli, 2015; Wilkinson et al, 2019). These habitats are heavily favored by developing menhaden as nurseries, and within these systems, menhaden appear to serve as a locally abundant resource for pelicans while they are present (Glass & Watts, 2009; Hartman & Brandt, 1995).…”

Section: Discussionmentioning

confidence: 99%

Support for the fasting endurance hypothesis of partial migration in a nearshore seabird

Wilkinson

Jodice

2023

Ecosphere

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Partial migration occurs when only a fraction of a population migrates instead of all individuals. Considered an evolutionary precursor to full migration, understanding why some individuals choose to undertake migration while others do not may serve to inform general migratory theory. While several hypotheses currently exist for explaining the maintenance of partial migration, empirical support for many is limited. To address this gap, we analyzed GPS data acquired from brown pelicans (Pelecanus occidentalis; n = 74), a partially migratory seabird, nesting on six colonies in the South Atlantic Bight over the course of four autumn migrations. We estimated that approximately 74% of pelicans nesting within the study area may be migratory on an annual basis, with the remainder staying within the surrounding marine ecoregion year-round. Mean date of migration initiation was 9 November, although movements occurred from September to December. Results from Cox's proportional hazards modeling indicated significant positive and negative effects of sea surface temperatures and body condition on migration rate, respectively. We suggest that the ontogenetic migration of the primary forage species of brown pelicans from estuarine to pelagic environments causes a seasonal reduction in prey and that pelicans in poor body condition are unable to meet the energetic demands potentially associated with this decrease in prey availability (i.e., the fasting endurance hypothesis of partial migration). Although we did not find evidence for a density-dependent migratory response, the effects of intraspecific competition on migration in pelicans also appear to warrant consideration.

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“…To assess the behavioral state-habitat associations across the local landscape, we fitted a mixed effect Bayesian multinomial logistic regression to evaluate how the prevalence of each state was influenced by LU/LC ( Wilkinson et al, 2019 ). This model estimated the probability of exhibiting each of the behavioral states with respect to a reference state while accounting for differences among individuals.…”

Section: Methodsmentioning

confidence: 99%

Biologging as an important tool to uncover behaviors of cryptic species: an analysis of giant armadillos (Priodontes maximus)

Cullen

Attias

Desbiez

et al. 2023

PeerJ

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Advances in biologging have increased the understanding of how animals interact with their environment, especially for cryptic species. For example, giant armadillos (Priodontes maximus) are the largest extant species of armadillo but are rarely encountered due to their fossorial and nocturnal behavior. Through the analysis of speed, turning angles, and accelerometer activity counts, we estimated behavioral states, characterized activity budgets, and investigated the state-habitat associations exhibited by individuals monitored with GPS telemetry in the Brazilian Pantanal from 2019 to 2020. This methodology is proposed as a useful framework for the identification of priority habitat. Using the non-parametric Bayesian mixture model for movement (M3), we estimated four latent behavioral states that were named ‘vigilance-excavation’, ‘local search’, ‘exploratory’, and ‘transit’. These states appeared to correspond with behavior near burrows or termite mounds, foraging, ranging, and rapid movements, respectively. The first and last hours of activity presented relatively high proportions of the vigilance-excavation state, while most of the activity period was dominated by local search and exploratory states. The vigilance-excavation state occurred more frequently in regions between forest and closed savannas, whereas local search was more likely in high proportions of closed savanna. Exploratory behavior probability increased in areas with high proportions of both forest and closed savanna. Our results establish a baseline for behavioral complexity, activity budgets, and habitat associations in a relatively pristine environment that can be used for future work to investigate anthropogenic impacts on giant armadillo behavior and fitness. The integration of accelerometer and GPS-derived movement data through our mixture model has the potential to become a powerful methodological approach for the conservation of other cryptic species.

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Tropical cyclones alter short-term activity patterns of a coastal seabird

Cited by 15 publications

References 43 publications

Pelagic seabirds reduce risk by flying into the eye of the storm

Pelagic seabirds reduce risk by flying into the eye of the storm

Support for the fasting endurance hypothesis of partial migration in a nearshore seabird

Biologging as an important tool to uncover behaviors of cryptic species: an analysis of giant armadillos (Priodontes maximus)

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