Colony Development and Density-Dependent Processes in Breeding Grey Herons

Shirai, Takeshi

doi:10.1155/2013/404065

Cited by 10 publications

(3 citation statements)

References 41 publications

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“…The new heron colonies established during our study period (post-2003) may be smaller in size in relation to older/source colonies (with the exception of Cattle Egret colonies) but fared better in the case of three species; a higher population increase in the case of Squacco and Purple Herons, and a lower population decrease in the case of the Grey Heron. Such a pattern has been reported before, with new/small colonies having a higher level of breeding success in terms of successful nests and number of fledglings per nest compared to larger colonies [62]. Nevertheless, not all new colonies survived.…”

Section: Drivers Of Heron Nesting Population Trendssupporting

confidence: 78%

Population Trend of Colonially Nesting Heron Species in Greece

Kazantzidis,

Naziridis,

Katrana

et al. 2024

Birds

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Heron colonies are dynamic components of wetlands. Therefore, their systematic monitoring is important for the management of both birds and wetlands. During the period 1988–2018, we counted breeding pairs of seven colonial breeding heron species at 65 colonies across 37 wetlands in Greece. We considered as annual variables of a population: (a) years since 1988, (b) Natura 2000 network inclusion, (c) protected area management authority overseeing, (d) wetland type (new or restored), and (e) new colonies (established after 2003). The Cattle Egret Bubulcus ibis and the Squacco Heron Ardeola ralloides had a positive breeding population trend. The Black-crowned Night Heron Nycticorax nycticorax, Little Egret Egretta garzetta, and Grey Heron Ardea cinerea had a negative trend, while the Purple Heron Ardea purpurea population was stable. The Great White Egret Ardea alba bred sporadically at only a few sites which precluded the evaluation of its population trend. The informative population variables differed among species, even of those at the same colony, which suggests trends are also affected by conditions at wintering grounds. The study highlights the need for the systematic monitoring of heron colonies and the protection of foraging/breeding areas in order to reverse the observed negative population trends.

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Section: Drivers Of Heron Nesting Population Trendssupporting

confidence: 78%

Population Trend of Colonially Nesting Heron Species in Greece

Kazantzidis,

Naziridis,

Katrana

et al. 2024

Birds

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“…Beyond the impacts of foraging success, nesting phenology may also be related to factors such as population size or structure (Votier et al 2009, Shirai 2013. Larger populations of Dalmatian pelicans Pelecanus crispus and great white pelicans Pelecanus onocrotalus nest earlier than smaller populations (Doxa et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Multidecadal trends in the nesting phenology of Pacific and Atlantic leatherback turtles are associated with population demography

Robinson¹,

Valentine²,

Tomillo³

et al. 2014

Endang. Species. Res.

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Knowledge of the mechanisms influencing phenology can provide insights into the adaptability of species to climate change. Here, we investigated the factors influencing multidecadal trends in the nesting phenology of the leatherback turtle Dermochelys coriacea at Playa Grande, Costa Rica, in the eastern Pacific Ocean and at Sandy Point, US Virgin Islands, in the western Atlantic Ocean. Between 1993 and 2013, the median nesting date (MND) at Playa Grande occurred later, at a rate of ~0.3 d yr . The opposing trends in the MND of each population were not explained by variation in the multivariate El Niño-Southern Oscillation index, North Atlantic Oscillation index, or Atlantic Multidecadal Oscillation index; however, the MND at Playa Grande was significantly correlated with nesting population size. We propose that changes in demography, linked to the population decline at Playa Grande, and the population recovery at Sandy Point may explain the contrasting trends in MNDs. If the observed trends in MND continue into the future, the nesting season at Playa Grande will coincide with increasingly adverse conditions for hatching success, exacerbating the already detrimental effects of climate change. Alternatively, shifts in the nesting phenology may make the Atlantic populations more resilient to climate change. Our findings highlight the increasing need for conservation efforts for eastern Pacific leatherback turtles to consider climate change mitigation practices.

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“…area of woodland consisting of Quercus acutissima, Q. serrata, Carpinus tschonoskii, Prunus jamasakura and Pinus densiflora. The colony was a single-species heronry consisting of 111 218 nests during the nine-year study period (Shirai 2013). Herons often foraged at the water sites in the roofless cages of zoo animals, and were captured with a large cage trap (2.0 m high, 6.5 m wide, 4.0 m long) set on the shores of a pond in a cage enclosure used for captive Red-crowned Cranes Grus japonensis and Oriental Storks Ciconia boyciana.…”

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

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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.

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Colony Development and Density-Dependent Processes in Breeding Grey Herons

Cited by 10 publications

References 41 publications

Population Trend of Colonially Nesting Heron Species in Greece

Population Trend of Colonially Nesting Heron Species in Greece

Multidecadal trends in the nesting phenology of Pacific and Atlantic leatherback turtles are associated with population demography

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

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