Application of current ultrastructural eggshell quality assessment in captive breeding programmes: Observations on hatched and unhatched eggs of the Saker falcon (Falco cherrug)

1999 ◽  
Vol 40 (sup001) ◽  
pp. 23-24
Author(s):  
A. Edmond ◽  
M.M. Bain ◽  
S.E. Solomon ◽  
N.C. Fox
Keyword(s):  
Quality Assessment ◽  
Captive Breeding ◽  
Eggshell Quality ◽  
Breeding Programmes ◽  
Saker Falcon ◽  
Falco Cherrug

scholarly journals Re-introduction of the Saker Falcon (Falco cherrug) in Bulgaria - preliminary results from the ongoing establishment phase by 2020

2021 ◽  
Vol 9 ◽  
Author(s):  
Ivanka Lazarova ◽  
Rusko Petrov ◽  
Yana Andonova ◽  
Ivaylo Klisurov ◽  
Andrew Dixon
Keyword(s):  
Captive Breeding ◽  
Current Phase ◽  
Unified Approach ◽  
Breeding Performance ◽  
Active Nest ◽  
Preliminary Results ◽  
Saker Falcon ◽  
History Of ◽  
Falco Cherrug ◽  
Establishment Phase

Considered extinct as breeding species in the early 2000s, the Saker Falcon was recovered when the first active nest from the new history of the species in Bulgaria was discovered in 2018, formed of two birds that were re-introduced back in 2015. Currently, there is only one confirmed wild breeding pair in the country - the male from 2015 with a female changed in 2020, released again as a part of the programme, in 2016. This is a report on the preliminary results and analysis of the ongoing establishment phase of the re-introduction of the Saker Falcon (Falco cherrug) in Bulgaria - first ever performed for this species in the country and globally. The period studied is 2015-2020. Following the re-introduction activities started in 2011, the current phase is defined by standardised methodology and a unified approach. Analysed and presented are methods for captive breeding and hacking, the breeding performance of the falcons, the number of released individuals, data from the post-fledging dependence period and a model of population growth.

scholarly journals Implications of captive breeding for the reintroduction of the Saker falcon (Falco cherrug) in Bulgaria

2021 ◽  
Vol 13 (3) ◽  
Author(s):  
R. Petrov ◽  
Y. Andonova ◽  
Y. Gancheva ◽  
I. Klisurov
Keyword(s):  
Captive Breeding ◽  
Detailed Comparison ◽  
Ex Situ ◽  
European Origin ◽  
Threefold Increase ◽  
Wildlife Rehabilitation ◽  
In The Wild ◽  
Saker Falcon ◽  
Falco Cherrug ◽  
Rearing Methods

Abstract. The Saker falcon (Falco cherrug) is a globally endangered species recovered in 2018 in Bulgaria. The only known active pair currently breeding in the wild in the country is made up of captive-bred and released birds, part of the first reintroduction programme for the species in Bulgaria and globally. As part of the project, sourced Saker falcons of known European origin are bred ex situ, the juveniles are parent-reared and released in the wild by means of the hacking method. The aim of this study was to evaluate the success and effectiveness of the captive breeding and rearing methods. The objective of the study was to investigate, compare and assess the results from fertilization, hatching, survival and hacking of captive bred Saker falcons registered over a 10-year period (2011-2021) at the Wildlife Rehabilitation and Breeding Centre (WRBC) Green Balkans, with a more detailed comparison of the breeding activities carried out in 2020 and 2021 (as the reintroduction programme was restarted in 2020). The results show more than threefold increase in output of laid eggs with the employment of the double clutching method in 2020 and 2021, and an overall 65% release rate of the hatched in the WRBC Saker falcons, for the investigated period.

Saker Falcon (Falco cherrug)

2020 ◽  
Author(s):  
Jaume Orta ◽  
Peter F. D. Boesman ◽  
Chris Sharpe ◽  
Jeffrey S. Marks
Keyword(s):  
Saker Falcon ◽  
Falco Cherrug

scholarly journals Effect of captivity on morphology: negligible changes in external morphology mask significant changes in internal morphology

2018 ◽  
Vol 5 (5) ◽  
pp. 172470 ◽  
Author(s):  
Stephanie K. Courtney Jones ◽  
Adam J. Munn ◽  
Phillip G. Byrne
Keyword(s):  
Sexual Dimorphism ◽  
Captive Breeding ◽  
Morphological Changes ◽  
External Morphology ◽  
Wild Animals ◽  
Internal Morphology ◽  
In Captivity ◽  
Two Generations ◽  
Breeding Programmes ◽  
Source Populations

Captive breeding programmes are increasingly relied upon for threatened species management. Changes in morphology can occur in captivity, often with unknown consequences for reintroductions. Few studies have examined the morphological changes that occur in captive animals compared with wild animals. Further, the effect of multiple generations being maintained in captivity, and the potential effects of captivity on sexual dimorphism remain poorly understood. We compared external and internal morphology of captive and wild animals using house mouse ( Mus musculus ) as a model species. In addition, we looked at morphology across two captive generations, and compared morphology between sexes. We found no statistically significant differences in external morphology, but after one generation in captivity there was evidence for a shift in the internal morphology of captive-reared mice; captive-reared mice (two generations bred) had lighter combined kidney and spleen masses compared with wild-caught mice. Sexual dimorphism was maintained in captivity. Our findings demonstrate that captive breeding can alter internal morphology. Given that these morphological changes may impact organismal functioning and viability following release, further investigation is warranted. If the morphological change is shown to be maladaptive, these changes would have significant implications for captive-source populations that are used for reintroduction, including reduced survivorship.

Thyroid cystadenocarcinoma in a saker falcon (Falco cherrug)

2001 ◽  
Vol 149 (9) ◽  
pp. 277-278 ◽  
Author(s):  
J. H. Samour ◽  
J. L. Naldo ◽  
U. Wernery ◽  
J. Kinne
Keyword(s):  
Saker Falcon ◽  
Falco Cherrug

Complete mitochondrial genome of the Saker falcon, Falco cherrug (Falco, Falconidae)

2015 ◽  
Vol 27 (5) ◽  
pp. 3226-3227 ◽  
Author(s):  
Jing Lu ◽  
Jiang Lu ◽  
Xiang-Feng Li ◽  
Hui Jiang
Keyword(s):  
Mitochondrial Genome ◽  
Complete Mitochondrial Genome ◽  
Saker Falcon ◽  
Falco Cherrug

scholarly journals Causes of hatching failure in endangered birds

2012 ◽  
Vol 8 (6) ◽  
pp. 964-967 ◽  
Author(s):  
N. Hemmings ◽  
M. West ◽  
T. R. Birkhead
Keyword(s):  
Endangered Species ◽  
Captive Breeding ◽  
Wild Birds ◽  
Embryonic Tissue ◽  
Embryo Mortality ◽  
Fertility Status ◽  
Breeding Programmes

About 10 per cent of birds' eggs fail to hatch, but the incidence of failure can be much higher in endangered species. Most studies fail to distinguish between infertility (due to a lack of sperm) and embryo mortality as the cause of hatching failure, yet doing so is crucial in order to understand the underlying problem. Using newly validated techniques to visualize sperm and embryonic tissue, we assessed the fertility status of unhatched eggs of five endangered species, including both wild and captive birds. All eggs were classified as ‘infertile’ when collected, but most were actually fertile with numerous sperm on the ovum. Eggs of captive birds had fewer sperm and were more likely to be infertile than those of wild birds. Our findings raise important questions regarding the management of captive breeding programmes.

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