Post-breeding migration of Night Herons Nycticorax nycticorax tracked by GPS/GSM transmitters

Ledwoń, Mateusz; Betleja, Jacek

doi:10.1007/s10336-014-1131-z

Cited by 10 publications

(5 citation statements)

References 10 publications

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“…Also, stopover duration is often determined by the distance from the previous stopover, number of stopover opportunities en route, and the quality of the stopover site. Across heron species, stopover duration appears to be directly related to distance between stopovers and indirectly related to the number of available stopover sites (van der Winden et al 2010, Ledwoń and Betleja 2015, Stier et al 2017. Often, stopover duration is inversely related to stopover quality (Russell et al 1994), with high-quality sites allowing for optimal foraging conditions and efficient acquisition of energy.…”

Section: Discussionmentioning

confidence: 99%

Migratory stopover sites used by Reddish Egrets: prioritization for conservation

Koczur¹,

Ballard²

2022

ACE

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The conditions encountered during the migratory period, particularly at stopover sites, can influence individual survival, reproductive success, and population stability; therefore, knowledge of migration ecology is important for developing conservation strategies. We monitored stopover site use by Reddish Egrets (Egretta rufescens) marked with satellite transmitters between their breeding area in southern Texas, USA, and wintering sites in Mexico and El Salvador. The duration of time spent at stopover sites varied among individuals and seasons, ranging from 1 to 64 days at a particular site. Three of the four individuals that were tracked for multiple seasons flew farther between stopover sites during autumn migration compared to spring, and the average distance between stopovers ranged from 192 to 580 km among individuals. Laguna San Andres in Tamaulipas, Mexico, appeared to be the most important stopover site based on the proportion of the marked population that used it. Understanding the stopover ecology and habitat use of migratory individuals will help direct conservation efforts for the species. Haltes migratoires utilisées par les Aigrettes roussâtres : priorisation pour la conservationRÉSUMÉ. Les conditions rencontrées pendant la période de migration, en particulier sur les haltes migratoires, peuvent influencer la survie des individus, le succès de reproduction et la stabilité de la population. Par conséquent, il est important de connaitre l'écologie de la migration si l'on veut élaborer des stratégies de conservation. Nous avons suivi l'utilisation des sites de repos par des Aigrettes roussâtres (Egretta rufescens) marquées au moyen d'émetteurs satellites entre leur aire de nidification dans le sud du Texas, aux États-Unis, et leurs sites d'hivernage, au Mexique et au Salvador. La durée de séjour aux haltes a varié selon les individus et les saisons, s'échelonnant de 1 à 64 jours sur un site particulier. Trois des quatre individus qui ont été suivis pendant plusieurs saisons volaient plus loin entre les sites de repos pendant la migration d'automne par rapport à celle du printemps, et la distance moyenne entre les haltes allait de 192 à 580 km selon les individus. La lagune San Andres à Tamaulipas, au Mexique, s'avère le site de repos le plus important d'après la proportion de la population marquée qui l'utilise. La compréhension de l'écologie aux haltes et de l'utilisation de l'habitat des individus migrateurs aidera à orienter les efforts de conservation de l'espèce.

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Section: Discussionmentioning

confidence: 99%

Migratory stopover sites used by Reddish Egrets: prioritization for conservation

Koczur¹,

Ballard²

2022

ACE

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“…We captured a migrating White-eared Night Heron on the night of 29 October 2019 (Fig. 1) and used a backpack harness to attach a GPS/GSM transmitter (Hangzhou Yuehai Technology Ltd., China) to this heron (Ledwoń and Betleja 2014; Xu et al . 2022).…”

Section: Methodsmentioning

confidence: 99%

“…The points at stopover sites that were representative of the mean position were calculated using the mean longitude and latitude of all sites (Kölzsch et al 2015). We defined stopover sites as places where the distance between two points exceeded 50 km and where the heron remained for > 12 hr (Ledwoń and Betleja 2014). In addition, we conducted field surveys to characterize the extent of human disturbance at wintering, stopover, and summering sites around the GPS locations and identify the current conservation risks for the White-eared Night Heron.…”

Section: Methodsmentioning

confidence: 99%

Northward Migration Route of one White-Eared Night Heron (Gorsachius magnificus) Revealed by GPS/GSM Tracking

Jia,

Liu,

et al. 2023

Waterbirds

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The White-eared Night Heron (Gorsachius magnificus) is a poorly known species. Little ecological research has been conducted on this species, and its migration route in particular is poorly understood. Clarification of the migratory routes of this species can enhance our understanding of its distribution and aid its conservation. Here, we identified the wintering and summering sites and characterized the migration route of one White-eared Night Heron by GPS/GSM tracking. Our results indicated that the Nanting River on the China–Myanmar border is the wintering site for this individual, and the Shizhuang River in Nanzhang, Hubei Province, China is the summering site. The heron migrated along the mountains and rested near rivers and reservoirs. This study is the first to reveal the migration route of the White-eared Night Heron. Our findings suggest that this species in Yunnan, Hubei, and Guizhou Provinces is not a resident bird. Generally, these data will aid the conservation of this species, including the development of action plans and the establishment of local nature reserves along its migration route and at wintering, summering, and stopover sites.

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“…The largely nocturnal migratory movements exhibited by reddish egrets is a common strategy among birds to minimize predation risk and maximize foraging time for species that are visual foragers and rely on daylight hours to forage (Alerstam 2009). It is a strategy that has been documented in other herons, including night-herons Nycticorax nycticorax (Ledwoń and Betleja 2015) and purple herons Ardea purpurea (Winden et al 2010), as well as other closely related waterbirds (Huschle et al 2013).…”

Section: Timing Of Migrationmentioning

confidence: 99%

Drivers of partial migration in the reddish egret Egretta rufescens

Koczur,

Ballard

2023

Journal of Avian Biology

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The reddish egret Egretta rufescens is North America's rarest Ardeidae and is listed as ‘Near Threatened' by the IUCN, as endangered in Mexico, and as a species of conservation concern throughout much of its range in the United States. Little is known about the migratory behavior of the reddish egret. Individuals that were banded during the breeding season in Texas, USA, have been resighted away from breeding areas; however, records are limited and the extent of migration is unknown. Using GPS transmitters, we found reddish egrets breeding in southern Texas exhibited a partial migration strategy, with 39% of the marked population migrating from breeding sites. We assessed the dominance, body size, and arrival time hypotheses to better understand the drivers of partial migration. We did not find support for the body size hypothesis and found mixed support for the dominance hypothesis; both males and females migrated, and migratory status of individuals did not change across the years of study. Long‐distance migrants were also larger than resident individuals. We found some support for the arrival time hypothesis; residents began breeding earlier than long‐distance migrants and had moderately greater nest success. However, within long‐distance migrants, an earlier arrival to breeding areas did not necessarily equate to earlier nesting or greater nest success. This study is the first to examine the migratory behavior of adult reddish egrets and assesses the dominance, body size, and arrival time hypotheses as explanations for partial migration in this species. Further, the results of this study emphasize the need for international conservation efforts.

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Post-breeding migration of Night Herons Nycticorax nycticorax tracked by GPS/GSM transmitters

Cited by 10 publications

References 10 publications

Migratory stopover sites used by Reddish Egrets: prioritization for conservation

Migratory stopover sites used by Reddish Egrets: prioritization for conservation

Northward Migration Route of one White-Eared Night Heron (Gorsachius magnificus) Revealed by GPS/GSM Tracking

Drivers of partial migration in the reddish egret Egretta rufescens

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