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123 results for “breeding success”
Fig. 3 in An exceptional influx and successful breeding of Pantala flavescens on the Island of Malta (Maltese Archipelago) (Odonata: Libellulidae)
Fig. 3 – The Fiddien puddle in early October, 2020 (from where nearly all exuviae were collected).
Fig. 1 in An exceptional influx and successful breeding of Pantala flavescens on the Island of Malta (Maltese Archipelago) (Odonata: Libellulidae)
Fig. 1 – The main reservoir at Chadwick Lakes in late September, 2020.
Fig. 6 in An exceptional influx and successful breeding of Pantala flavescens on the Island of Malta (Maltese Archipelago) (Odonata: Libellulidae)
Fig. 6 – Pair copula over Fiddien puddle on 17th October, 2020.
Fig. 2 in An exceptional influx and successful breeding of Pantala flavescens on the Island of Malta (Maltese Archipelago) (Odonata: Libellulidae)
Fig. 2 – The inner reservoir at Chadwick Lakes in early November, 2020.
Figure 2 in Breeding success of the Stone Curlew Burhinus oedicnemus in Nag Valley (1999-2001), Kharan, Pakistan
Figure 2. The nest of the Stone Curlew on bare ground in Nag Valley.
Figure 3 in Nest characteristics and breeding success of Sarus Crane, Antigone antigone (Linnaeus, 1758) (Aves: Gruidae) in different habitats at Dhanauri Wetland, Uttar Pradesh, India
Figure 3. Nest of Sarus Crane in perennial wetland.
Figure 4 in Nest characteristics and breeding success of Sarus Crane, Antigone antigone (Linnaeus, 1758) (Aves: Gruidae) in different habitats at Dhanauri Wetland, Uttar Pradesh, India
Figure 4. Female individual maintaining nest.
Figure 6 in Nest characteristics and breeding success of Sarus Crane, Antigone antigone (Linnaeus, 1758) (Aves: Gruidae) in different habitats at Dhanauri Wetland, Uttar Pradesh, India
Figure 6. Correlation between mean water depth and nest height.
Figure 1 in Nest characteristics and breeding success of Sarus Crane, Antigone antigone (Linnaeus, 1758) (Aves: Gruidae) in different habitats at Dhanauri Wetland, Uttar Pradesh, India
Figure 1. Camera trap (in red circle) used during the study.
From individual to population level: Temperature and snow cover modulate fledging success through breeding phenology in Greylag geese (Anser anser)
<p>Local weather conditions may be used as environmental cues by animals to optimize their breeding behaviour, and could be affected by climate change. We measured associations between climate, breeding phenology, and reproductive output in greylag geese (<i>Anser anser</i>) across 29 years (1990-2018). The birds are individually marked, which allows accurate long-term monitoring of life-history parameters for all pairs within the flock. We had three aims: (1) identify climate patterns at a local scale in Upper Austria, (2) measure the association between climate and greylag goose breeding phenology, and (3) measure the relationship between climate and both clutch size and fledging success. Ambient temperature increased 2°C across the 29-years study period, and higher winter temperature was associated with earlier onset of egg-laying. Using the hatch-fledge ratio, average annual temperature was the strongest predictor for the proportion of fledged goslings per season. There is evidence for an optimum time window for egg-laying (the earliest and latest eggs laid had the lowest fledging success). These findings broaden our understanding of environmental effects and population-level shifts which could be associated with increased ambient temperature and can thus inform future research about the ecological consequences of climate changes and reproductive output in avian systems.</p>
Data from: Annual variation in breeding success in boreal forest grouse
<ol> <li>Knowledge of the temporal variation in reproductive success and its key driving factors is crucial in predicting animal population persistence. Few studies have examined the effects of a range of explanatory factors operating simultaneously on the same population over a long period.</li> <li>Based on 41 years of monitoring (1979–2019), we tested prevailing hypotheses about drivers of annual variation in breeding success in two sympatric species of boreal forest grouse – the capercaillie (<em>Tetrao</em> <em>urogallus</em>) and the black grouse (<em>T</em>. <em>tetrix</em>) – in a 40 km<sup>2</sup> boreal forest landscape.</li> <li>From counts in early August, we measured breeding success (chicks/hen) along with potential determining factors. We formulated five main hypotheses on causes of variation (hen condition, chick weather, chick food, predation, demographic characteristics), and derived 13 associated explanatory variables for analysis. We first tested the five hypotheses separately and then used model selection (AICc) to rank the best predictive models irrespective of hypotheses. Lastly, we used path analysis to illuminate potential causal relationships. </li> <li>Barring demographic characteristics, all hypotheses were supported, most strongly for chick food and predation. Among predictor variables, chick food (insect larvae and bilberry fruit crops), vole and fox abundances, the winter-NAO index, and temperature after hatching, had the strongest effect sizes in both species. Precipitation after hatching had no detectable effect. Model selection indicated bottom-up factors to be more important than predation, but confounding complicated interpretation. Path analysis suggested that the high explanatory power of bilberry fruiting was due not only to its direct positive effect on chick food quality but also to an indirect positive effect on vole abundance, which buffers predation. The two components of breeding success – proportion of hens with broods and number of chicks per brood – were uncorrelated, the former having the strongest effect. The two components had different ecological correlates that often varied asynchronously, resulting in overall breeding success fluctuating around low to moderate levels.</li> <li>Our study highlights the complexity of key explanatory drivers and the importance of considering multiple hypotheses of breeding success. Although chick food appeared to equal or surpass predation in explaining the annual variation in breeding success, predation may still be the overall limiting factor. Comparative and experimental studies of confounded variables (bilberry fruiting, voles and larvae) are needed to disentangle causes of variation in breeding success of boreal forest grouse.</li> </ol>
Data from: Cascading effects of climate variability on the breeding success of an edge population of an apex predator
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Warm winters lead to early breeding, increased breeding effort, but lower reproductive success, in a threatened habitat specialist
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Code and data for: Familiarity breeds success: pairs that meet earlier experience increased breeding performance in a wild bird population
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No difference in reproductive investment or success across urban and rural breeding pairs in an urban-adapted songbird
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Data from: It’s not all about temperature: breeding success also affects nest design
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Data from: Associations between human non-motorized recreational activity on nest box occupation, exploratory behaviour, and breeding success in a passerine bird
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Data from: Annual variation in breeding success in boreal forest grouse
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Data from: Carry-over effects of seasonal migration on reproductive success through breeding site retention in a partially migratory bird
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Apparent breeding success drives long-term population dynamics of a migratory swan
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