Limits...
Hand-rearing, release and survival of African penguin chicks abandoned before independence by moulting parents.

Sherley RB, Waller LJ, Strauss V, Geldenhuys D, Underhill LG, Parsons NJ - PLoS ONE (2014)

Bottom Line: Hand-rearing of abandoned penguin chicks is recommended as a conservation tool to limit mortality and to bolster the population at specific colonies.The feasibility of conservation translocations for the creation of new colonies for this species using hand-reared chicks warrants investigation.Any such programme would be predicated on adequate disease surveillance programmes established to minimise the risk of disease introduction to wild birds.

View Article: PubMed Central - PubMed

Affiliation: Animal Demography Unit and Marine Research Institute, University of Cape Town, Rondebosch, Western Cape, South Africa; Bristol Zoological Society, Bristol Zoo Gardens, Bristol, United Kingdom.

ABSTRACT
The African penguin Spheniscus demersus has an 'Endangered' conservation status and a decreasing population. Following abandonment, 841 African penguin chicks in 2006 and 481 in 2007 were admitted to SANCCOB (Southern African Foundation for the Conservation of Coastal Birds) for hand-rearing from colonies in the Western Cape, South Africa, after large numbers of breeding adults commenced moult with chicks still in the nest. Of those admitted, 91% and 73% respectively were released into the wild. There were veterinary concerns about avian malaria, airsacculitis and pneumonia, feather-loss and pododermatitis (bumblefoot). Post-release juvenile (0.32, s.e.  = 0.08) and adult (0.76, s.e.  = 0.10) survival rates were similar to African penguin chicks reared after oil spills and to recent survival rates recorded for naturally-reared birds. By December 2012, 12 birds had bred, six at their colony of origin, and the apparent recruitment rate was 0.11 (s.e.  = 0.03). Hand-rearing of abandoned penguin chicks is recommended as a conservation tool to limit mortality and to bolster the population at specific colonies. The feasibility of conservation translocations for the creation of new colonies for this species using hand-reared chicks warrants investigation. Any such programme would be predicated on adequate disease surveillance programmes established to minimise the risk of disease introduction to wild birds.

Show MeSH

Related in: MedlinePlus

Time-dependent encounter (or resighting) probabilities for banded, hand-reared African penguins released by SANCCOB in 2006 and 2007.Resightings were made over the period 2007 to 2012. Encounter probabilities are based on model 2, Table 4. Error bars show the 95% confidence intervals.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4206437&req=5

pone-0110794-g002: Time-dependent encounter (or resighting) probabilities for banded, hand-reared African penguins released by SANCCOB in 2006 and 2007.Resightings were made over the period 2007 to 2012. Encounter probabilities are based on model 2, Table 4. Error bars show the 95% confidence intervals.

Mentions: Model selection on the resighting data favoured the model with a constant recruitment probability and time-dependent encounter rates (Model 2, Table 4). Apparent survival was 0.32±0.08 (95% CI: 0.18–0.49) in the first year after release (juvenile survival) and 0.76±0.10 (0.51–0.90) in subsequent years (adult survival). Encounter rates were low initially at 0.01±0.01 (0.00–0.06) in 2007 and 0.06±0.02 (0.03–0.12) in 2008, but increased to 0.31±0.11 (0.14–0.55) in 2011, before falling back in 2012 (Figure 2). The recruitment probability was 0.11±0.03 (0.06–0.19) and there was no support for a change in this parameter over time or within the age structure we identified (Table 4).


Hand-rearing, release and survival of African penguin chicks abandoned before independence by moulting parents.

Sherley RB, Waller LJ, Strauss V, Geldenhuys D, Underhill LG, Parsons NJ - PLoS ONE (2014)

Time-dependent encounter (or resighting) probabilities for banded, hand-reared African penguins released by SANCCOB in 2006 and 2007.Resightings were made over the period 2007 to 2012. Encounter probabilities are based on model 2, Table 4. Error bars show the 95% confidence intervals.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4206437&req=5

pone-0110794-g002: Time-dependent encounter (or resighting) probabilities for banded, hand-reared African penguins released by SANCCOB in 2006 and 2007.Resightings were made over the period 2007 to 2012. Encounter probabilities are based on model 2, Table 4. Error bars show the 95% confidence intervals.
Mentions: Model selection on the resighting data favoured the model with a constant recruitment probability and time-dependent encounter rates (Model 2, Table 4). Apparent survival was 0.32±0.08 (95% CI: 0.18–0.49) in the first year after release (juvenile survival) and 0.76±0.10 (0.51–0.90) in subsequent years (adult survival). Encounter rates were low initially at 0.01±0.01 (0.00–0.06) in 2007 and 0.06±0.02 (0.03–0.12) in 2008, but increased to 0.31±0.11 (0.14–0.55) in 2011, before falling back in 2012 (Figure 2). The recruitment probability was 0.11±0.03 (0.06–0.19) and there was no support for a change in this parameter over time or within the age structure we identified (Table 4).

Bottom Line: Hand-rearing of abandoned penguin chicks is recommended as a conservation tool to limit mortality and to bolster the population at specific colonies.The feasibility of conservation translocations for the creation of new colonies for this species using hand-reared chicks warrants investigation.Any such programme would be predicated on adequate disease surveillance programmes established to minimise the risk of disease introduction to wild birds.

View Article: PubMed Central - PubMed

Affiliation: Animal Demography Unit and Marine Research Institute, University of Cape Town, Rondebosch, Western Cape, South Africa; Bristol Zoological Society, Bristol Zoo Gardens, Bristol, United Kingdom.

ABSTRACT
The African penguin Spheniscus demersus has an 'Endangered' conservation status and a decreasing population. Following abandonment, 841 African penguin chicks in 2006 and 481 in 2007 were admitted to SANCCOB (Southern African Foundation for the Conservation of Coastal Birds) for hand-rearing from colonies in the Western Cape, South Africa, after large numbers of breeding adults commenced moult with chicks still in the nest. Of those admitted, 91% and 73% respectively were released into the wild. There were veterinary concerns about avian malaria, airsacculitis and pneumonia, feather-loss and pododermatitis (bumblefoot). Post-release juvenile (0.32, s.e.  = 0.08) and adult (0.76, s.e.  = 0.10) survival rates were similar to African penguin chicks reared after oil spills and to recent survival rates recorded for naturally-reared birds. By December 2012, 12 birds had bred, six at their colony of origin, and the apparent recruitment rate was 0.11 (s.e.  = 0.03). Hand-rearing of abandoned penguin chicks is recommended as a conservation tool to limit mortality and to bolster the population at specific colonies. The feasibility of conservation translocations for the creation of new colonies for this species using hand-reared chicks warrants investigation. Any such programme would be predicated on adequate disease surveillance programmes established to minimise the risk of disease introduction to wild birds.

Show MeSH
Related in: MedlinePlus