Relating Grey Heron survival rates to winter weather conditions

North, Philip M.

doi:10.1080/00063657909476612

Cited by 31 publications

(15 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is interesting that one of the models developed by North (1978) is based on the assumption that birds' journeys from the breeding colony may be made up of some movements in opposite directions (considering motion along a line) while other models consider motion in one direction only, yet both types of model appear to be compatible with the observed data. There is a need here to discriminate between the models, and to do this we would need to know whether or not there is any evidence that Razorbills move in opposite directions on the same journey from the breeding colony.…”

Section: Winter Quarters and Movements To Winter Quarterssupporting

confidence: 65%

“…Referring to the ideas of renewal theory (Cox 1962, North 1979, North and Morgan 1979, which typically is used to study problems connected with the failure and replacement of machine components, further insight into the mathematical description of the birds' movements can be gained. Here the distributions of 6.6 60 recovery distances correspond to the distributions of failure times in renewal theory, and the distance-specific stopping rate corresponds to the age-specific failure rate.…”

Section: Preliminary Analysismentioning

confidence: 99%

“…North (1978) derives a number of models for recoveries of birds not killed directly by man's actions, treating separately birds which are in their winter quarters and birds moving to their winter quarters, as above. In the models for birds moving to their winter quarters, the combined effect of a movement process and a death process is considered.…”

Section: Winter Quarters and Movements To Winter Quartersmentioning

confidence: 99%

See 2 more Smart Citations

An analysis of Razorbill movements away from the breeding colony

North

1980

Bird Study

Self Cite

View full text Add to dashboard Cite

Section: Winter Quarters and Movements To Winter Quarterssupporting

confidence: 65%

Section: Preliminary Analysismentioning

confidence: 99%

Section: Winter Quarters and Movements To Winter Quartersmentioning

confidence: 99%

See 1 more Smart Citation

An analysis of Razorbill movements away from the breeding colony

North

1980

Bird Study

Self Cite

View full text Add to dashboard Cite

“…Igualmente, en Reino Unido existe una población invernante y otra reproductora (RSPB, BTO, 2008). Las bajas temperaturas invernales son un factor de mortandad para estas y otras ardeidas (North, 1979;Pineau, 1992;Fleury com. pers., 2014) por lo que parece lógico pensar que lleguen a las costas del cantábrico aves que se han reproducido en latitudes más norteñas dentro de la vertiente atlántica.…”

Section: Discussionunclassified

Abundancia de garcilla bueyera Bubulcus ibis L. 1758 en Cantabria durante el periodo 2012-2015.

Val¹,

Sanz-Gil²

2017

Munibe, Cienc. nat.

View full text Add to dashboard Cite

ResumenLa garcilla bueyera (Bubulcus ibis L.) ha experimentado una gran expansión a nivel global en los últimos 100 años, llegando a colonizar la mayor parte del planeta a excepción del continente Antártico. Como especie nueva en Cantabria, el objetivo principal de este trabajo ha sido conocer su fenología y abundancia. En primer lugar se localizaron los dormideros, un total de 18, situados a lo largo de la mitad norte de la provincia, la mayoría en humedales de la franja costera. Posteriormente se realizaron los censos, siempre al atardecer, cuando las garcillas acuden a estos emplazamientos para pernoctar. Los resultados obtenidos indican una mayor abundancia y distribución de ejemplares durante el invierno (más de 6.000 individuos) que en la época estival (menos de 4.000), cuando más del 90 % de los ejemplares se concentra en las dos colonias de cría existentes. Existe una alta movilidad de la especie, ya que sin que apenas cambie la abundancia global encontramos que la abundancia de ejemplares dentro de cada dormidero es muy variable. Por otro lado, entre los dos dormideros principales más lejanos hay tan solo 75 km en línea recta, una distancia similar a lo que sabemos puede recorrer una garcilla bueyera diariamente (60-70 km). Con respecto al uso que hacen de los dormideros, se han registrado diferentes niveles de ocupación y fidelidad, que van desde los más de mil ejemplares pernoctando durante al menos dos meses seguidos, hasta aquellas localizaciones en las que aparecen menos de cien aves de manera puntual y su presencia no vuelve a registrarse en los meses posteriores. Podemos concluir que esta especie se ha consolidado como residente en Cantabria tras su reciente aparición hace poco más de veinte años, mostrando una gran capacidad a la hora de asentarse en el territorio y encontrar lugares de descanso y reproducción.Palabras clave: Garcilla bueyera, Bubulcus ibis, dormidero, población, expansión. AbstractThe range of the cattle egret has expanded greatly over the last 100 years, leading to its colonization of most of the planet, with the exception of the Antarctic. As a new species in Cantabria, the main objective of this study was to gather information on its abundance and phenology. Firstly, a total of 18 roosts were found in the northern half of the province, the majority of which were located within the coastal belt and near-shore wetlands. Later, a census was carried out at dusk, when the cattle egrets returned to their roosts to spend the night.The results obtained indicate a greater abundance and distribution of individuals during the winter months (more than 6,000 individuals) than in the summer period (less than 4,000 individuals), when more than 90% of the birds are concentrated within the two established breeding colonies. The species exhibits a high level of mobility, as, without significant changes in the overall population, we found that the cattle egrets´ presence/absence in roosts is highly variable. Moreover, between the two main roosts there are only 75 km, as the crow flies, which i...

show abstract

“…Grey Herons Ardea cinerea live for 11 18 years (Lack 1949, Verheyen & LeGrelle 1952, Olsson 1958, North 1979, North & Morgan 1979, and their colonies are usually maintained over long periods of time (e.g., Marquiss 1989, Fernández-Cruz & Campos 1993, suggesting that site fidelity would be beneficial in this species. Mortality of adult Grey Herons is rather low at 28 30 per year (Olsson 1958, Mead et al 1979, which allows for high mate fidelity.…”

Section: Introductionmentioning

confidence: 99%

Breeding Colony Fidelity and Long-term Reproductive History of Individually Marked Wild Grey Herons

Shirai

2013

Journal of the Yamashina Institute for Ornithology

View full text Add to dashboard Cite

Abstract. Site fidelity to the colony and breeding histories of individual Grey Herons Ardea cinerea were examined by intensive and long-term (nine years) observations of 50 fledglings and 19 adult birds banded with colour-patterned rings in a single-species colony in suburban Tokyo. In total, 38 (76.0 ) of 50 marked fledglings were never resighted in the natal colony. Of the 12 returning birds, four (33.3 ) began to breed at 2-years-old, two (16.7 ) at 3-years-old, one (8.3 ) at 4-years-old, and five (41.7 ) never bred. Two birds survived after 9 years from fledging. In total, 18 (94.7 ) of 19 adult birds were resighted in the next breeding season and most of them (15/18) bred there. Birds tend to stay at the same breeding colony once they had returned. Some birds exhibited site fidelity to the breeding nest every year, but others did not. Pair bonds remained stable in four pairs throughout years until one individual in a pair was lost. The number of chicks fledged per nest did not change with the age of the parent. Two broods in the same breeding season were observed in 7 (9.0 ) of 78 nests, in which at least one parent was marked. The maximum number of fledglings produced by a single male over the 9 years was 22. Of 23 birds that were resident for more than two years, four birds (all females) continued to stay at the colony site after the breeding season. However, 19 birds (eight males, three females, eight unsexed) left the colony after the late breeding season and were observed in outside locations, particularly at fixed feeding sites. The maximum distance of resighted, marked fledglings was 1,580 km southwest of the colony, 54 days after release.

show abstract

Relating Grey Heron survival rates to winter weather conditions

Cited by 31 publications

References 10 publications

An analysis of Razorbill movements away from the breeding colony

An analysis of Razorbill movements away from the breeding colony

Abundancia de garcilla bueyera Bubulcus ibis L. 1758 en Cantabria durante el periodo 2012-2015.

Breeding Colony Fidelity and Long-term Reproductive History of Individually Marked Wild Grey Herons

Contact Info

Product

Resources

About