REPRODUCTION AND IMMUNE HOMEOSTASIS IN A LONG-LIVED SEABIRD, THE NAZCA BOOBY (<i>Sula granti</i>)

Apanius, Victor; Westbrock, Mark A.; Anderson, David J.

doi:10.1525/om.2008.65.1.1

Cited by 25 publications

(32 citation statements)

References 145 publications

(159 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A related study (Apanius et al 2007) on this same popu- Apanius et al (2007) found parents of daughters spent 8.4% and 5.5% more time at sea for daughters than for sons at offspring ages 70 and 90 days, respectively, after the appearance of SSD and while offspring were still sustaining growth with their food intake (Fig. 1).…”

Section: Discussionmentioning

confidence: 74%

“…Supporting the idea that potentially long-lived Nazca booby parents would provide extra care to daughters if they also remained under a low-cost ceiling, data from 2002-2003 on parent mass loss and immunoglobin G showed no evidence of excess costs to self-maintenance from raising daughters (Apanius et al 2007). Together, these studies indicate that Nazca booby daughters have greater food requirements than do sons, and parents meet those excess demands when food availability allows both satisfied daughters and uncompromised self-maintenance.…”

Section: Discussionmentioning

confidence: 93%

“…We used canonical discriminant function analysis to integrate data on mass of food delivered, feeding frequency, and parental mass changes to test the null hypothesis of equal parental effort for sons and daughters, providing data for one extreme of the longevity spectrum. Finally, we compare the results with those from the same population in a different year (Apanius et al 2007), providing a perspective incorporating environmental heterogeneity.…”

Section: Annual Adult Survival Referencesmentioning

confidence: 99%

See 2 more Smart Citations

Offspring growth and parental care in sexually dimorphic Nazca boobies (Sula granti)

2007

View full text Add to dashboard Cite

A review of studies on nestling bird food requirements indicates that degree of sexual size dimorphism reliably predicts disparity in sex-specific food requirements, but that parents often fail to meet the excess requirement of the larger sex. We studied a population of Nazca boobies (Sula granti Rothschild, 1902), a sexually dimorphic pelagic seabird, to determine whether parents provide more care to daughters, the larger sex. Daughters grew to a larger size than did sons during the nestling period, but did not reach the mean size of adult females, while sons exceeded the size of adult males. Estimates of parental effort exerted for sons versus daughters indicated similar levels of effort, and that females fledged in poorer condition than males did in the study year, one of intermediate breeding conditions. Results from another study conducted during better breeding conditions indicated little limitation on growth of either sex. Together, these studies are consistent with a ceiling on parental effort in a long-lived species that allows consistent self-maintenance for parents, but causes poor performance in the costlier sex under poor breeding conditions. Complementary studies of short-lived species are needed to evaluate our suggested linkage between parental effort, self-maintenance, and sexual size dimorphism.Résumé : Une rétrospective des besoins alimentaires des oiseaux nicheurs indique que l'importance du dimorphisme de la taille en fonction du sexe permet de prédire la disparité dans les besoins alimentaires spécifiques au sexe, mais que les parents n'arrivent souvent pas à satisfaire les besoins des oiseaux du sexe de plus grande taille. Nous avons étudié une population de fous de Nazca (Sula granti Rothschild, 1902), un oiseau marin pélagique à dimorphisme sexuel prononcé, afin de déterminer si les parents fournissent plus de soin à leur progéniture femelle, le sexe de plus grande taille. Les poussins femelles atteignent une taille plus importante que les poussins mâles durant la période de nidification, mais sans parvenir à la taille moyenne des femelles adultes, alors que les poussins mâles dépassent la taille des mâles adultes. Nos estimations indiquent que les parents fournissent un niveau d'effort semblable pour leurs progénitures mâle et femelle; durant l'année de notre étude, une année de conditions de reproduction moyennes, les femelles ont quitté le nid en moins bonne condition que les mâles. Les résultats d'une étude antérieure faite durant de meilleures conditions de reproduction montre peu de restriction de la croissance chez les deux sexes. Ensemble, ces deux études semblent indiquer l'existence d'un plafond à l'effort parental chez les espèces à forte longévité, qui permet le maintien des parents eux-mêmes, mais qui cause une performance réduite du sexe le plus onéreux lorsque les conditions de reproduction sont mauvaises. Des études complémen-taires chez des espèces à faible longévité seraient nécessaires pour confirmer le lien que nous faisons entre l'effort parental, le maintien de soi d...

show abstract

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 93%

Section: Annual Adult Survival Referencesmentioning

confidence: 99%

See 1 more Smart Citation

Offspring growth and parental care in sexually dimorphic Nazca boobies (Sula granti)

2007

View full text Add to dashboard Cite

show abstract

“…Seabirds are generally long lived, and their reproductive output and offspring survival are often used as indicators of resource levels available to parents during breeding (Monaghan, Nager & Houston ; Weimerskirch et al . ; Apanius, Westbrock & Anderson ; Fairhurst et al . ).…”

Section: Introductionmentioning

confidence: 99%

Linking dietary shifts and reproductive failure in seabirds: a stable isotope approach

et al. 2013

View full text Add to dashboard Cite

Summary1. Diet-related breeding failure in seabirds has been attributed to declines in key prey abundance, the quality of prey and overall prey availability. However, identifying which aspect of diet is responsible for reproductive failure is challenging due to the practicalities of measuring prey utilization and the actual availability and abundance of those resources. 2. In this study, stable isotope-based Bayesian models, in combination with indices of resource availability, were used to assess the links between prey availability, seabird diet and reproductive success in a generalist, inshore top predator, the little penguin, Eudyptula minor. 3. The most probable causes for the sharp decrease in little penguin reproductive performance were diminished localized populations of anchovies, Engraulis australis, in combination with the scarcity of alternative prey. Low dietary diversity and the consumption of low trophic value prey were observed in this period. In the contrasting following year, penguins consumed increased levels of anchovy as well as a high diversity of prey. High dietary diversity and the consumption of high trophic value prey were observed in birds' pre-breeding and breeding diet and likely led to early breeding and high reproductive success. 4. Our results highlight that resource abundance and the availability of a variety of prey taxa are critical factors in enabling this inshore seabird to adjust to changes in environmental conditions and fluctuations in prey.5. An understanding of seabird diet is integral to their conservation and management. Monitoring seabird trophic niche dimensions and reproductive parameters can elucidate causes for population declines and can provide information about particular prey species and foraging locations that require protection.

show abstract

“…NAV behavior was observed on only one occasion during 46 person-years of field work in and around that colony. In Perú, however, blue-footed booby colony density was comparable to the density of the Nazca booby nests where we studied them in the colony at Punta Cevallos, Españ ola Island, Galápagos [27,28]. Ecological factors, such as high nesting density, may cause some populations to show NAV behavior while others do not.…”

Section: Introductionmentioning

confidence: 99%

Mirror-Induced Behavior in the Magpie (Pica pica): Evidence of Self-Recognition

2016

Animal Behavior

View full text Add to dashboard Cite

Background: Exposure to androgens early in development, while activating adaptive aggressive behavior, may also exert long-lasting effects on non-target components of phenotype. Here we compare these organizational effects of perinatal androgens in closely related Nazca (Sula granti) and blue-footed (S. nebouxii) boobies that differ in neonatal social system. The older of two Nazca booby hatchlings unconditionally attacks and ejects the younger from the nest within days of hatching, while blue-footed booby neonates lack lethal aggression. Both Nazca booby chicks facultatively upregulate testosterone (T) during fights, motivating the prediction that baseline androgen levels differ between obligately siblicidal and other species.

show abstract

REPRODUCTION AND IMMUNE HOMEOSTASIS IN A LONG-LIVED SEABIRD, THE NAZCA BOOBY (Sula granti)

Cited by 25 publications

References 145 publications

Offspring growth and parental care in sexually dimorphic Nazca boobies (Sula granti)

Offspring growth and parental care in sexually dimorphic Nazca boobies (Sula granti)

Linking dietary shifts and reproductive failure in seabirds: a stable isotope approach

Mirror-Induced Behavior in the Magpie (Pica pica): Evidence of Self-Recognition

Contact Info

Product

Resources

About