Frequency of multiple brooding in Ring Ouzels, including first documented cases of triple brooding

Sim, Innes M.W.; Rebecca, Graham W.; Wilkinson, Nicholas

doi:10.1080/00063657.2012.707637

Cited by 3 publications

(3 citation statements)

References 16 publications

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“…This difference in productivity between the British uplands and the Alps has most likely its source in the number of broods achieved per reproductive season. While double brooding has never been observed in our two focal Alpine populations, it concerns more than half of the breeding females in the Scottish highlands, with even triple-brooding observed in rare cases (Sim et al, 2012). Yet, an increased reproductive effort probably entails higher intrinsic costs (Bennett and Owens, 2002;Martin, 2004;Dobson, 2007) that are paid back in the form of reduced adult survival in Scottish ring ouzels.…”

Section: Comparison Across the Rangementioning

confidence: 57%

“…Besides a subspecies occurring in the Middle East (T. t. amicorum in the Caucasus and Turkey), two other subspecies of ring ouzel are distinguished across the distribution range (Keller et al, 2020) (Burfield, 2002). Double brooding is common in the United Kingdom (e.g., 63% in Scotland; Sim et al, 2012), whereas it is apparently rare in Fennoscandia (Burfield, 2002). Demographic parameters from a population in Scotland are presented in Table 1 (Sim et al, 2011).…”

Section: Study Species and Study Sitesmentioning

confidence: 99%

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Variation in Demography and Life-History Strategies Across the Range of a Declining Mountain Bird Species

Barras

Blache²,

Schaub

et al. 2021

Front. Ecol. Evol.

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Species- and population-specific responses to their environment may depend to a large extent on the spatial variation in life-history traits and in demographic processes of local population dynamics. Yet, those parameters and their variability remain largely unknown for many cold-adapted species, which are exposed to particularly rapid rates of environmental change. Here, we compared the demographic traits and dynamics for an emblematic bird species of European mountain ecosystems, the ring ouzel (Turdus torquatus). Using integrated population models fitted in a Bayesian framework, we estimated the survival probability, productivity and immigration of two populations from the Western European Alps, in France (over 11 years) and Switzerland (over 6 years). Juvenile apparent survival was lower and immigration rate higher in the Swiss compared to the French population, with the temporal variation in population growth rate driven by different demographic processes. Yet, when compared to populations in the northwestern part of the range, in Scotland, these two Alpine populations both showed a much lower productivity and higher adult survival, indicating a slower life-history strategy. Our results suggest that demographic characteristics can substantially vary across the discontinuous range of this passerine species, essentially due to contrasted, possibly locally evolved life-history strategies. This study therefore raises the question of whether flexibility in life-history traits is widespread among boreo-alpine species and if it might provide adaptive potential for coping with current environmental change.

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Section: Comparison Across the Rangementioning

confidence: 57%

Section: Study Species and Study Sitesmentioning

confidence: 99%

Variation in Demography and Life-History Strategies Across the Range of a Declining Mountain Bird Species

Barras

Blache²,

Schaub

et al. 2021

Front. Ecol. Evol.

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“…Ouzels vigorously defend the immediate vicinity of nests, but disputes outside this area are rare (Burfield 2002). A successful breeding cycle requires 29-30 days (16-17 days for egg laying/incubation plus 13 days until fledging; Burfield 2002), and Brit-ish ouzels regularly make two, rarely three, breeding attempts per season (Sim et al 2012). The number of 'early' and 'late' pairs were defined as those laying eggs within 30 days of the first laying date recorded in the population, and on or after day 31, respectively, in each year (Sim et al 2011).…”

Section: Study Area and Speciesmentioning

confidence: 99%

Food supplementation does not increase demographic rates in a passerine species of conservation concern

Sim¹,

Wilkinson²,

Scridel³

et al. 2015

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Numerous studies have examined the effects of the provision of supplementary food on aspects of avian reproductive success, but far fewer have gone on to examine the potential positive effects of food supplementation on the demographic rates which are key for population growth rate. Testing for potential effects of food shortage on vital rates is likely to be particularly important in species of high conservation concern, where populations are particularly small, isolated or decreasing rapidly. Here we test the effects of the provision of supplementary food on reproductive success, body condition at fledging and post-fledging survival of ring ouzels (Turdus torquatus), a species of high conservation concern in the UK. However, food supplementation had no detectable effect on any of these parameters. There was no significant difference in return rates of fed and unfed fledglings in the year following hatching, and most post-fledging mortality was apparently caused by predation by raptors and mustelids. We conclude that the supply of invertebrate food sources for nestlings was not a major limiting factor in our study area, at least during this two-year study. Further studies are required to quantify the precise mix of habitats used by ring ouzels, at the appropriate scale, which provide concealment from predators and access to food supplies throughout the spring and summer months.

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Postfledging survival, movements, and dispersal of Ring Ouzels (Turdus torquatus)

Sim

Ludwig

Grant

et al. 2013

The Auk

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Recent evidence suggests that avian population growth rates may be constrained by low postfledging survival. Therefore, quantifying postfledging mortality and understanding the ecological factors that influence it are fundamental for assessing the relative importance of this life-history stage for population growth and identifying the ecological drivers of population dynamics. We radiotracked  juvenile Ring Ouzels (Turdus torquatus), a species of high conservation concern in the United Kingdom, to test hypotheses regarding the timing and causes of postfledging mortality and to quantify the timing and magnitude of local movements and dispersal. Juveniles fledged from early-season broods had higher survival during each -day period over  days postfledging (. ± . [SE]) than juveniles fledged from late-season broods (. ± .). Most mortality occurred within the first  weeks postfledging, and predation by raptors and mammals was the main apparent cause of mortality, accounting for % and % of deaths, respectively. Juvenile survival decreased at the age of independence from parental care. Juveniles traveled increasing distances from their nests with time after fledging, and those that fledged early in the season dispersed outside the study area at significantly older ages than those that fledged late in the season.

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Frequency of multiple brooding in Ring Ouzels, including first documented cases of triple brooding

Cited by 3 publications

References 16 publications

Variation in Demography and Life-History Strategies Across the Range of a Declining Mountain Bird Species

Variation in Demography and Life-History Strategies Across the Range of a Declining Mountain Bird Species

Food supplementation does not increase demographic rates in a passerine species of conservation concern

Postfledging survival, movements, and dispersal of Ring Ouzels (Turdus torquatus)

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