Regulation of parental effort in a long-lived seabird an experimental manipulation of the cost of reproduction in the antarctic petrel, Thalassoica antarctica

Sæther, Bernt‐Erik; Andersen, Reidar; Pedersen, Hans Christian

doi:10.1007/bf00216594

Cited by 132 publications

(110 citation statements)

References 19 publications

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“…Finally, generalizing from movement data collected on animals carrying devices must always be done with the caveat that natural behaviour may be altered, and early telemetry studies in procellariiforms have collectively shown negative impacts (Saether et al 1993, Phillips et al 2003. Our shortterm deployments utilising tape (not harness) attachments caused no immediate desertions and, when comparing experimental nests with controls, produced no significant effects on medium-term (breeding season) reproductive success or on provisioning (although there was a small difference in mean meal payload delivery).…”

Section: Discussionmentioning

confidence: 99%

Simultaneous multi-colony tracking of a pelagic seabird reveals cross-colony utilization of a shared foraging area

Dean¹,

Kirk²,

Fayet³

et al. 2015

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 99%

Simultaneous multi-colony tracking of a pelagic seabird reveals cross-colony utilization of a shared foraging area

Dean¹,

Kirk²,

Fayet³

et al. 2015

Mar. Ecol. Prog. Ser.

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“…For instance, female cervides may stop lactating during periods with bad weather (Gaillard and Yoccoz 2003), resulting in mortality of the offspring. Accordingly, shortlived bird species generally respond by increased foraging effort when the nutritional requirements are artificially increased (Wright and Cuthill 1989), but such a response sacrificing the probability of own survival in favor of offspring investment is rarely recorded in long-lived species (Saether et al 1993).…”

Section: Discussionmentioning

confidence: 99%

Life‐History Variation Predicts the Effects of Demographic Stochasticity on Avian Population Dynamics

Sæther

Engen

Møller

et al. 2004

The American Naturalist

125

113

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Comparative analyses of avian population fluctuations have shown large interspecific differences in population variability that have been difficult to relate to variation in general ecological characteristics. Here we show that interspecific variation in demographic stochasticity, caused by random variation among individuals in their fitness contributions, can be predicted from a knowledge of the species' position along a "slow-fast" gradient of life-history variation, ranging from high reproductive species with short life expectancy at one end to species that often produce a single offspring but survive well at the other end of the continuum. The demographic stochasticity decreased with adult survival rate, age at maturity, and generation time or the position of the species toward the slow end of the slow-fast life-history gradient. This relationship between life-history characteristics and demographic stochasticity was related to interspecific differences in the variation among females in recruitment as well as to differences in the individual variation in survival. Because reproductive decisions in birds are often subject to strong natural selection, our results provide strong evidence for adaptive modifications of reproductive investment through life-history evolution of the influence of stochastic variation on avian population dynamics.

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“…In conditions of deteriorating food availability, seabirds may maximize reproductive success by increasing breeding efforts and investing as much as possible in their offspring. Alternatively, individuals may have a fixed level of parental investment in a given reproductive period and may not invest above a given threshold that will negatively affect self-maintenance (Stearns 1992, Saether et al 1993, Navarro & González-Solís 2007. Provisioning behavior is generally considered to be a good measure of the breeding efforts of parents.…”

Section: Introductionmentioning

confidence: 99%

Foraging effort does not influence body condition and stress level in little auks

Jakubas¹,

Głuchowska²,

Wojczulanis‐Jakubas³

et al. 2011

Mar. Ecol. Prog. Ser.

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In conditions of deteriorating food availability, seabirds may maximize their breeding success by increasing reproductive effort, which compromises body condition, stress level, survival, and future reproductive success. We studied a small planktivorous alcid, the little auk Alle alle, in 2 breeding colonies in west Spitsbergen, Norway (Hornsund and Magdalenefjorden) with contrasting oceanographic conditions (Arctic and Atlantic environments, respectively). We hypothesized that the chick diet composition and parental foraging effort differs between these colonies, which results in intercolony variation in body mass and stress level of both adults and chicks. We found differences in sea temperature and salinity (both lower in Hornsund) and the abundance of Atlantic copepod Calanus finmarchicus (3.6 times less abundant in Hornsund) between foraging areas. Birds from both colonies foraged selectively on Calanus glacialis CV. Composition, total biomass and energy content of food loads were similar in both colonies, though food delivered to nestlings in Magdalenefjorden was more diverse. The frequency of feeds was also similar in both colonies. Parent little auks in Magdalenefjorden, however, performed longer foraging trips than in Hornsund (medians 183 vs. 124 min). Longer foraging trips suggest that these birds traveled longer distances to find abundant prey at the marginal sea ice zone and/or spent more time foraging close to the colony but in poorer foraging areas. Despite increased parental efforts in Magdalenefjorden, body mass and stress levels of adults and chicks were similar in both colonies. This suggests that little auks from northwest Spitsbergen did not reach a threshold requiring prioritization of self-maintenance over chick provisioning.

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Regulation of parental effort in a long-lived seabird an experimental manipulation of the cost of reproduction in the antarctic petrel, Thalassoica antarctica

Cited by 132 publications

References 19 publications

Simultaneous multi-colony tracking of a pelagic seabird reveals cross-colony utilization of a shared foraging area

Simultaneous multi-colony tracking of a pelagic seabird reveals cross-colony utilization of a shared foraging area

Life‐History Variation Predicts the Effects of Demographic Stochasticity on Avian Population Dynamics

Foraging effort does not influence body condition and stress level in little auks

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