Breeding cycle of the Southern Bald Ibis, Geronticus calvus

Kopij, Grzegorz; Kok, O. B.; Nuttall, Rick

doi:10.1080/00306525.2000.9639838

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…For the period 1988Bohm (1999b reported that 76.4% of eggs hatched in zoos resulted in fledged young which would convert to an overall breeding success of more than two young per pair. Three studies of the closely related Southern Bald Ibis from different areas show productivity figures of between 0.29 and 0.84 chicks/pair (Allan 1985, Manry 1985, Kopij 1998, again lower than the average in the present study.…”

Section: Discussioncontrasting

confidence: 81%

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The status and recent breeding performance of the critically endangered Northern Bald Ibis Geronticus eremita population on the Atlantic coast of Morocco

Bowden

Aghnaj

Smith

et al. 2003

Ibis

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The main wild population of the Northern Bald Ibis Geronticus eremita breeds on the Atlantic coast of Morocco in the Agadir region. This paper describes the numbers of breeding pairs over the last two decades, the recent breeding performance, the causes of egg and chick losses and their conservation implications. Since 1980 there has been no overall decline in numbers with, over the last 5 years, 59–74 pairs breeding and a peak prebreeding population of around 220 birds. In contrast with the now extinct Northern Bald Ibis populations in Turkey and elsewhere in Morocco, the birds are present in the Agadir region throughout the year and do not appear to migrate from the area outside the breeding season. Breeding performance is highly variable from one year to the next but does not appear to be related to rainfall in the vicinity of the colonies as has been reported elsewhere. It is suggested that coastal fogs in this region may buffer the adverse impacts of low rainfall and may in part account for the year‐round residency of the birds. The main causes of breeding failures have been loss of eggs to predators and, most importantly, poor chick survival as a result of starvation and predation. Conservation action to date has focused on reducing the negative influences on breeding success but it is recognized that for such a long‐lived bird adult survival is also likely to be an important limiting factor on the population size.

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Section: Discussioncontrasting

confidence: 81%

“…The Southern Bald Ibis often nests in smaller colonies and appears to be more adept at exploiting cultivated habitats (Kopij 2001). It also has a much less synchronized breeding season than G. eremita, laying eggs over a 3-month period (Kopij 1998), thus allowing further adaptability.…”

Section: Discussionmentioning

confidence: 99%

The status and recent breeding performance of the critically endangered Northern Bald Ibis Geronticus eremita population on the Atlantic coast of Morocco

Bowden

Aghnaj

Smith

et al. 2003

Ibis

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“…Nest predators can indeed markedly reduce breeding success ofthese birds (Kopij 1995(Kopij , 1998a. The early morning departure of most Southern Bald Ibises to feed (Kopij et al 1999) can also playa role in this regard.…”

Section: Discussionmentioning

confidence: 97%

“…Data Book (Barnes 2000). Ecological requirements of the species are still poorly understood, and this knowledge is of crucial importance to any conservation measures (Kopij 1998a). This is especially true in regard to food requirements.…”

Section: Introductionmentioning

confidence: 99%

Feeding ecology of the Southern Bald Ibis, Geronticus calvus, in the Free State, South Africa

Kopij¹

2001

Ostrich

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“…There are probably differences between species and also the sex of particular species. For example, Kopij (1998) found that males of Geronticus eremita (Linnaeus, 1758) (Pelecaniformes: Threskiornithidae) spent 23.3% of time preening during the non‐breeding season and only 2.5% in the breeding season, whereas females spent equally 4.9% and 8.6% of time by preening in the non‐breeding and breeding season, respectively. Conversely, Metzmacher (1990) reported that for females of Passer hispaniolensis (Temminck, 1820) (Passeriformes: Passeridae) preening decreased during incubation, whereas for males the length of this activity did not appear to fluctuate during breeding the period.…”

Section: Discussionmentioning

confidence: 99%

Chewing lice of passerine birds in reed beds in Slovakia, with a special focus onPanurus biarmicus

Sychra

Ošlejšková

Skoupá

et al. 2022

Medical Vet Entomology

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A total of 1185 passerine birds representing five species were examined for chewing lice in reed beds in southwestern Slovakia in spring (April) 2008, 2009 and 2016. Additional collecting focused only on chewing lice from Panurus biarmicus (Linnaeus, 1758) (Passeriformes: Panuridae) was carried out in spring (April), summer (July) and autumn (October) 2019. A total of 283 (24%) birds were parasitized by 10 species of chewing lice of four genera: Penenirmus, Menacanthus, Philopterus, and Brueelia. Most birds showed only very light (1–10 lice/host; 74%) to light infestations (11–20 lice/host; 16%). The authors found significantly higher prevalences and mean abundances of chewing lice on residents/short‐distance migrants, that is, P. biarmicus, Acrocephalus melanopogon (Temminck, 1823) (Passeriformes: Acrocephalidae), than on long‐distance migratory birds, that is, Acrocephalus scirpaceus (Hermann, 1804), Acrocephalus schoenobaenus (Linnaeus, 1758) (Passeriformes: Acrocephalidae), Locustella luscinioides (Savi, 1824) (Passeriformes: Locustellidae). No significant difference was found in the total mean intensity of chewing lice between these two groups of birds. Ischnoceran lice were more prevalent and abundant than amblyceran lice on residents and short‐distance migrants, whereas the opposite was found on bird species that migrate long distances. A total of 146 (58%, n = 251) P. biarmicus were parasitized by 1490 chewing lice. Males of P. biarmicus showed higher prevalence and mean abundance than females with gradually descending values of prevalence, mean abundance and mean intensity from spring to autumn. The knowledge of the occurrence and population dynamics of lice on wild passerine birds can be useful in endangered species conservation programs and can also be applied to captive passerine birds, which may be analogous to resident birds in this sense.

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Breeding cycle of the Southern Bald Ibis, Geronticus calvus

Cited by 5 publications

References 2 publications

The status and recent breeding performance of the critically endangered Northern Bald Ibis Geronticus eremita population on the Atlantic coast of Morocco

The status and recent breeding performance of the critically endangered Northern Bald Ibis Geronticus eremita population on the Atlantic coast of Morocco

Feeding ecology of the Southern Bald Ibis, Geronticus calvus, in the Free State, South Africa

Chewing lice of passerine birds in reed beds in Slovakia, with a special focus onPanurus biarmicus

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