Immature Survival and Age at First Breeding of Damara Terns: Conservation from a Non-Breeding Perspective

Braby, Justine; Braby, Sigrid J.; Braby, Rodney; Altwegg, Res

doi:10.5253/078.099.0208

Cited by 10 publications

(8 citation statements)

References 31 publications

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“…Also, variation in estimated pre-breeding survival is partly introduced by the age at which chicks are ringed, which also varies in the different published studies. Chicks ringed closer to fledging provide a higher estimate of survival to recruitment than chicks ringed soon after hatching, indicating that substantial mortality occurs between hatching and fledging (Robinson 2010;Braby et al 2011). Our pre-breeding survival estimate (0.54) is much higher than the only other estimate obtained for a tern of the same genus-the Black Tern in Wisconsin, USA (\0.02 %; Shealer 2007).…”

Section: Pre-breeding Survivalmentioning

confidence: 58%

“…Spendelow et al 2002;Lebreton et al 2003, Monticelli et al 2008b, Braby et al 2011Feare and Doherty 2011;Braby et al 2012). The data presented here are the first estimates of survival for this species.…”

Section: Adult Survivalmentioning

confidence: 73%

“…In general, our data indicate that most individuals start breeding around their third and fourth calendar year, with the proportion of experienced breeders being 37 % in the third year, 62 % in the fourth calendar year and 77 % in the fifth calendar year. Agespecific breeding probabilities have also been estimated in other tern species, indicating that most Whiskered Terns would appear to start breeding about 1 year earlier than members of the genera Sterna and Onychoprion (Ludwigs and Becker 2002;Spendelow et al 2002;Lebreton et al 2003;Braby et al 2011;Feare and Doherty 2011).…”

Section: First Time Breedingmentioning

confidence: 99%

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Adult and pre-breeding survival estimates of the Whiskered Tern Chlidonias hybrida breeding in southern Poland

Ledwoń

Neubauer

Betleja³

2013

J Ornithol

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We present the first-ever survival estimates of the Whiskered Tern Chlidonias hybrida, based on the analysis of capture-recapture data (403 adults and 1,484 chicks ringed) collected between 1993 and 2011 in an increasing breeding population in southern Poland. Data were modelled using multistate models with an unobservable state, accounting for the period during which young terns remain at their winter quarters. Model-averaged prebreeding and breeding survival were estimated to be 0.54 [standard error (SE) 0.28] and 0.80 (SE = 0.05), respectively. All models were in agreement that the relative proportion of breeders was nearly zero in the second calendar year, increasing to reach values close to 0.8 in the fifth calendar year, which confirms the observation of a much delayed maturation of the Whiskered Tern. Our data indicate that most Whiskered Tern start to breed about 1 year earlier than members of genera Sterna and Onychoprion. However, the precision of the estimates for the parameter describing the transition probability from the unobservable pre-breeding to the observable breeding state was extremely poor; therefore, these estimates should be treated as tentative until more data are collected. The three best-supported models indicated significant annual variation in recapture probability. The results also suggested that forced exchange of breeding colonies is frequent in the study area; consequently, a large proportion of birds ringed as chicks are breeding in colonies other than their respective natal colony. This exchange is best explained not by the trapping and ringing activity but by human management of the environment, such as water level changes in dam reservoirs and carp Cyprinus carpio farming at fish ponds, both of which result in breeding habitats becoming unstable and periodically unavailable, possibly forcing birds to change breeding sites.Keywords Whiskered Tern Á Chlidonias hybrida Á Capture-mark-recapture modelling Á Apparent survival Á Age at first breeding Á Fidelity Á Bird trapping

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Section: Pre-breeding Survivalmentioning

confidence: 58%

Section: Adult Survivalmentioning

confidence: 73%

Section: First Time Breedingmentioning

confidence: 99%

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Adult and pre-breeding survival estimates of the Whiskered Tern Chlidonias hybrida breeding in southern Poland

Ledwoń

Neubauer

Betleja³

2013

J Ornithol

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“…Nisbet and Cam 2002;Szostek and Becker 2012; other seabirds: e.g. Breton et al 2006;Braby et al 2011;Emmerson and Southwell 2011;Pardo et al 2013). This indicates that first-time breeders, irrespective of age, were not subject to lower survival through an elevated cost of reproduction, (at least not immediately, long-term costs might apply: e.g.…”

Section: Annual Survival Ratesmentioning

confidence: 98%

Survival and local recruitment are driven by environmental carry-over effects from the wintering area in a migratory seabird

Szostek

Becker

2015

Oecologia

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We estimated annual apparent survival rates, as well as local recruitment rates in different age groups and for different breeding status in the common tern Sterna hirundo using mark-recapture analysis on a long-term individual-based dataset from a breeding colony in Germany. Strong inter-annual variability in survival rates became apparent, especially in prospectors. Local recruitment also varied strongly between years and age groups. To explain these fluctuations, we linked survival and recruitment estimates to several environmental covariates expected to be limiting during the wintering period and migration, including the global climate indices of North Atlantic Oscillation and Southern Oscillation, fish abundance indices, and marine primary productivity in the West African wintering area. Contrary to expectations, global indices did not seem to be linked strongly to vital rates. Results showed that primary productivity had the strongest effect on annual survival, especially in young and inexperienced individuals. Primary productivity in the wintering area was also strongly associated with the probability of recruitment in the following breeding season, indicating that conditions during winter can have carry-over effects on the life cycle of individuals.

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“…One incubating adult caught on 19 January 2010 was thought to be two years old; it exhibited three series of primary moult and had a brownish crown rather than the full black crown of the other breeding adults. The age at first breeding of Damara Terns was estimated to be 3-4 years (Braby et al 2011a), although one individual aged two years was found incubating in Namibia. Age at first breeding may be at two years in the closely related Little Tern Sternula albifrons, although it is normally later (Cramp 1983).…”

Section: Biology Of the Eastern Cape Damara Tern Populationmentioning

confidence: 99%

The status of the Damara Tern in the Eastern Cape, South Africa

Whittington

Tree

Connan

et al. 2015

Ostrich

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The Eastern Cape population of the Damara Tern Sternula balaenarum was estimated to be 25-29 pairs in the 2008/09 and 2009/10 breeding seasons. The population appears to be stable and has probably increased slightly since the early 1990s. An eastward shift of the majority of nest sites in the Alexandria dunefields of 5-10 km was recorded since the early 1990s. Breeding Damara Terns caught at night and colour-flagged in the Alexandria dunefields averaged 12% heavier than the average mass of birds handled in Namibia and egg masses ranged from 11% to 22% heavier than 21 fresh egg masses recorded in Namibia. Adult Damara Terns caught at night while incubating, were ringed and marked with coloured leg-flags. All chicks located were also ringed and leg-flagged. A stable isotope analysis of scapular feathers suggested that breeding adults from the Eastern Cape may moult in similar areas to the Namibian population, i.e. West Africa. Small numbers of Damara Terns were recorded during the winter in the Eastern Cape. Although these included no colour-flagged birds, the numbers of birds marked were probably too low to draw any definite conclusions regarding the origin of over-wintering Damara Terns.

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Immature Survival and Age at First Breeding of Damara Terns: Conservation from a Non-Breeding Perspective

Abstract: BioOne Complete (complete.BioOne.org) is a full-text database of 200 subscribed and open-access titles in the biological, ecological, and environmental sciences published by nonprofit societies, associations, museums, institutions, and presses.

Cited by 10 publications

References 31 publications

Adult and pre-breeding survival estimates of the Whiskered Tern Chlidonias hybrida breeding in southern Poland

Adult and pre-breeding survival estimates of the Whiskered Tern Chlidonias hybrida breeding in southern Poland

Survival and local recruitment are driven by environmental carry-over effects from the wintering area in a migratory seabird

The status of the Damara Tern in the Eastern Cape, South Africa

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