Delayed start of full incubation is related to a delayed brood patch development in Magellanic Penguins<i>Spheniscus magellanicus</i>

Barrionuevo, Melina; Frere, Esteban

doi:10.1080/00063657.2016.1184617

Cited by 4 publications

(4 citation statements)

References 21 publications

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“…Haftorn 1981, Massaro et al . 2006, Barrionuevo & Frere 2016). Our results also showed that the later in the laying sequence the diurnal partial incubation started, the shorter it was, suggesting that females are able to speed up incubation behaviour later in the laying sequence.…”

Section: Discussionmentioning

confidence: 98%

Impacts of ambient temperature and clutch size on incubation behaviour onset in a female‐only incubator songbird

Diez‐Méndez¹,

Sanz²,

Barba

2021

Ibis

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Ambient temperature is assumed to be the major cue used by passerines to synchronize their laying and hatching dates to the expected peak of prey availability. While laying eggs, females are still able to fine‐tune their hatching date following increasing or decreasing patterns of ambient temperature, mostly via changes in incubation onset. The onset of incubation behaviour in relation to the laying sequence could have later consequences for the duration of the incubation period and the extent of hatching asynchrony. Clutch size is also known to affect incubation patterns and might therefore condition potential responses to changing temperatures. In this study we assessed the association of ambient temperature and clutch size with the onset of four different incubation behaviours: partial and full nocturnal incubation, and partial and full diurnal incubation. We also evaluated how the onset and duration of each incubation behaviour might predict the duration of diurnal full incubation and the extent of hatching asynchrony. To achieve our aims, we monitored incubation behaviour using temperature data loggers during the egg‐laying period in three Mediterranean Great Tit Parus major populations in three consecutive years. Our results showed that increasing temperatures were related to an advance of diurnal partial incubation, but not its duration or the onset of full incubation behaviour. We did not find any effect of ambient temperatures on nocturnal incubation. However, females lengthened nocturnal partial incubation and delayed the onset of nocturnal full and diurnal partial incubation when laying larger clutches. Longer diurnal incubation before clutch completion was associated with greater hatching asynchrony. Moreover, longer diurnal partial incubation shortened the duration of the full incubation period. In conclusion, increasing ambient temperatures during the egg‐laying period advanced diurnal partial incubation, indirectly shortening the full incubation period and increasing hatching asynchrony.

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Section: Discussionmentioning

confidence: 98%

Impacts of ambient temperature and clutch size on incubation behaviour onset in a female‐only incubator songbird

Diez‐Méndez¹,

Sanz²,

Barba

2021

Ibis

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“…Later in the night incubation phase, the brood patch is more developed, and incubation temperatures should be less sensitive to ambient temperature. A gradual increase in incubation temperatures early in the incubation phase has been noted in other species and have also been attributed to the progression of brood patch development (Etches et al , Barrett , Morton and Pereyra , St. Clair , Massaro et al , Barrionuevo and Frere ). Anecdotally, we noticed that wood ducks in our study generally began night incubation once there was a significant amount of down insulation present in the nest, possibly having been shed during the maturation of the brood patch.…”

Section: Discussionmentioning

confidence: 70%

“…This finding may be attributable to brood patch development. Early in the night incubation phase, the brood patch is relatively underdeveloped (Haftorn , St. Clair , Barrionuevo and Frere ) and incubation temperatures should be more sensitive to ambient conditions because the hen cannot yet fully regulate the clutch temperature. Later in the night incubation phase, the brood patch is more developed, and incubation temperatures should be less sensitive to ambient temperature.…”

Section: Discussionmentioning

confidence: 99%

Ambient temperature and female body condition are related to night incubation behavior in wood ducks Aix sponsa

Grimaudo

Hope

DuRant

et al. 2020

Journal of Avian Biology

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For many animals, parental care behavior is an important aspect of their life history that affects both parents and offspring. In birds, one of the most important parental care behaviors is incubation, which is costly to the parent but directly influences embryonic development and fitness of offspring. Some birds exhibit the intriguing behavior of partially incubating their eggs prior to clutch completion for only a portion of each day. This partial incubation is characterized by lower incubation temperatures and constancy than during full‐time incubation, which typically begins at clutch completion. Partial incubation may preserve the viability of eggs laid early in the laying sequence, shorten the length of the full incubation period, and/or provide a favorable microclimate to the incubating parent. It might also reduce the probability of nest predation, nest site takeover by another bird, brood parasitism, and/or predation of the adult. Although there is evidence that partial incubation is an adaptive behavior and that time invested in this behavior varies among individuals of the same species, nothing is known about what may drive this inter‐individual variation. To investigate how environmental and parental characteristics may be related to partial incubation behavior, we studied the partial incubation behavior of wood ducks Aix sponsa using artificial egg temperature loggers within nest boxes. Our results suggest that females with greater mass relative to their structural size invest more time in partial incubation. Additionally, the incubation temperature and length of on‐bouts of partial incubation increased over the course of the partial incubation period, and ambient temperature during on‐bouts was positively related to incubation temperature. Ultimately, our study suggests that characteristics of both the environment and parent may influence the partial incubation behavior of wood ducks, and improves our understanding of an important, but understudied, aspect of avian parental care.

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“…Parsons [13] suggested that the small size of the first egg was related to a lower physiological efficiency of females at the up-start of egg laying, while other studies support a physiological and hormonal, genetically based, explanation to the overall pattern of intraclutch egg-size variation [see 4]. Alternative but not mutually exclusive hypotheses, have related intraclutch egg-size variation to the depletion of resources in laying females with egg number, to incubation strategy, to facilitation of hatching synchrony and to differential investment in eggs with highest probability of hatching [8,10,11,[14][15][16][17][18][19][20][21][22]. Despite the long-term focus on intraclutch egg-size variation, neither adaptive nor non-adaptive explanations have proved to fully explain the observed egg size patterns.…”

Section: Introductionmentioning

confidence: 99%

Condition dependent strategies of egg size variation in the Common Eider Somateria mollissima

Christensen

Balsby

2020

PLoS ONE

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We analysed intraclutch egg-size variation over the laying sequence in relation to clutch size, and the relation between clutch size and female body condition, in the Common Eider Somateria mollissima during an 8-year period. The aim was to assess if eiders adjusted egg size within the laying sequence depending on clutch sizes in response to body condition, as such an adjustment could have adaptive implications on reproductive success through a size advantage for the hatchlings. The analyses were performed on a population level; and then at the individual level using data from recaptured females that changed clutch size between years. Based on 1,099 clutches from 812 individual females, population clutch size averaged 4.13 eggs (range: 1-6), with 4-and 5-egg clutchesconstituting c.70% of all clutches, taking turns in being the most represented clutch size. Clutch size was positively related to female pre-laying body condition at both the population and individual levels. Egg size varied significantly within and between clutch sizes and changes were significantly related to the laying sequence. First eggs were significantly larger in 4-egg clutches and second eggs marginally smaller than in 5-egg clutches, a pattern also found among individual females changing clutch size between years. The relationship between female pre-laying body condition and clutch size, and the intraclutch egg-size pattern indicate that both clutch size and egg size are actively adapted to the pre-breeding body condition of the female. As egg size potentially optimise reproductive success through a size advantage in hatchlings, the observed pattern of intraclutch egg-size variation suggests that female eiders possesses a finely tuned conditional dependent mechanism that may optimize reproductive output in years were females are in suboptimal body condition for breeding.

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Delayed start of full incubation is related to a delayed brood patch development in Magellanic PenguinsSpheniscus magellanicus

Cited by 4 publications

References 21 publications

Impacts of ambient temperature and clutch size on incubation behaviour onset in a female‐only incubator songbird

Impacts of ambient temperature and clutch size on incubation behaviour onset in a female‐only incubator songbird

Ambient temperature and female body condition are related to night incubation behavior in wood ducks Aix sponsa

Condition dependent strategies of egg size variation in the Common Eider Somateria mollissima

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