Plasticity in foraging behaviour and diet buffers effects of inter-annual environmental differences on chick growth and survival in southern rockhopper penguins Eudyptes chrysocome chrysocome

Dehnhard, Nina; Ludynia, Katrin; Masello, Juan F.; Voigt, Christian C.; McGill, Rona A. R.; Quillfeldt, Petra

doi:10.1007/s00300-015-1887-5

Cited by 15 publications

(11 citation statements)

References 73 publications

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“…In our study, a decreased SST resulted in a considerably reduced foraging trip duration and foraging range. The same phenomenon, to a lesser extent, has been observed in SRP during the chick-rearing period (Dehnhard et al 2016). Furthermore, it could be shown that lower SST increased not only the likelihood of SRP individual survival over the winter months (Raya Rey et al 2007;Dehnhard et al 2013) but also individual body mass at the onset of the reproduction period (Dehnhard et al 2015a).…”

Section: Trip Duration and Sstmentioning

confidence: 72%

Plasticity in the foraging behavior of male Southern Rockhopper Penguins (Eudyptes chrysocome) during incubation in the Falkland/Malvinas Islands

Pütz¹,

Harris

Ratcliffe

et al. 2018

Polar Biol

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Environmental changes often affect the persistence of species or populations at different spatial and temporal scales. Thus, species must either adapt to these changes or experience negative impacts at the individual or population levels. Southern Rockhopper Penguins Eudyptes chrysocome are distributed throughout the Southern Ocean and have experienced substantial declines in the past which were linked to various anthropogenic and environmental factors. The aim of this study was to investigate the foraging behavior of male Southern Rockhopper Penguins at Berkeley Sound, East Falkland, Falkland/ Malvinas Islands, during incubation, a period at-sea which is crucial for replenishing body condition between two extended fasting periods ashore. Thus, birds are forced to forage efficiently during that time to balance their energy demands. We linked their at-sea distribution and foraging behavior to satellite-derived sea surface temperatures and temperature-depth profiles which were recorded by devices attached to the birds. While Southern Rockhopper Penguins usually travel several hundreds of km out into the open sea on multiple-day trips during incubation, we found in our study that most birds foraged close inshore, less than 9 km away from their colony, and regularly returned to their breeding site. We propose that this behavior occurred in response to the close proximity of the 8 °C SST isotherm and the vertical stratification of the waters therein. Also, while usually feeding pelagically in open waters, there are strong indications that Southern Rockhopper Penguins performed benthic or, at least, near-bottom dives to catch their prey during these short trips. The consequences of this behavioral plasticity in response to variations in sea temperatures and inferred prey availability are discussed, especially with regard to predicted global climate change.

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Section: Trip Duration and Sstmentioning

confidence: 72%

Plasticity in the foraging behavior of male Southern Rockhopper Penguins (Eudyptes chrysocome) during incubation in the Falkland/Malvinas Islands

Pütz¹,

Harris

Ratcliffe

et al. 2018

Polar Biol

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“…African Penguins, Spheniscus demersus, Pichegru et al 2013 andGentoo Penguins, Xavier et al 2017), we highlight that no difference in diet was observed between the sexes in the crèche stage in a study of the same population of Northern Rockhopper Penguins during the same breeding season (Booth and McQuaid 2013). Furthermore, Dehnhard et al (2016) observed similar foraging behaviour, in terms of dive depth, between crèche stage male and female Southern Rockhopper Penguins.…”

Section: Discussionmentioning

confidence: 55%

“…Dive data were analysed using MULTITRACE (Jensen software systems, Kiel, Germany). Prior to analysis, all data were corrected for a drifting surface level (recorded depth is adjusted so that the surface level is maintained at 0 m, Hagihara et al 2011) and the dive threshold at which a foraging dive was deemed to occur was set to ≥3 m (in accordance with other studies of Rockhopper Penguins: Cherel et al 1999;Cherel 2000, 2003;Dehnhard et al 2016;Whitehead et al 2016). Some birds were not recaptured after one foraging trip, and so consecutive trips were recorded over several days.…”

Section: Discussionmentioning

confidence: 99%

Foraging plasticity of breeding Northern Rockhopper Penguins, Eudyptes moseleyi, in response to changing energy requirements

et al. 2018

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“…N values compared to other known prey consumed by rockhopper penguins (such as fish) (Polito et al, 2011;Dehnhard et al, 2016). Even though the underlying mechanisms remain unclear, this shows that female diet affects eggs differentially at least for isotopic compositions (Prediction 4), and that females with a low contribution of krill in their diet differentiate resources more strongly between A-and B-yolks.…”

mentioning

confidence: 92%

“…Stable isotope analysis therefore represents an indirect method to assess foraging strategies, which can be used to determine the relative importance of feeding sources (Gauthier et al, 2003). For instance, penguins predominantly feeding on krill (with low δ 13 C and δ 15 N values) show low isotope values compared to penguins predominantly feeding on fish (with high δ 13 C and δ 15 N values) (Polito et al, 2011;Dehnhard et al, 2016). Krill also contains higher levels of lipophilic antioxidants (mostly astaxanthin) than fish (Tou et al, 2007).…”

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confidence: 99%

Extreme intra-clutch egg size dimorphism is not coupled with corresponding differences in antioxidant capacity and stable isotopes between eggs

Poisbleau

Beaulieu

Dehnhard

et al. 2017

Comparative Biochemistry and Physiology Part A: Molecular &

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Oviparous females need to allocate resources optimally to their eggs in order to maximize their fitness. Among these resources, dietary antioxidants, acquired by females and transferred to the eggs during egg formation, can greatly affect the development and survival of the embryo and chick. In crested penguins, incubation starts after the second and last egg is laid and, as opposed to many other bird species, this egg hatches first, thereby enhancing the survival of the chick. Here, we assessed whether antioxidant and isotopic composition could underlie these differences between eggs within clutches of southern rockhopper penguins (Eudyptes chrysocome chrysocome). The second-laid egg had higher total antioxidant capacity than the first-laid egg, although this was not due to higher antioxidant concentration but to its higher mass. This suggests that resources are allocated by females at a constant rate in both eggs within clutches. Accordingly, we found a strong correlation for isotopic compositions between eggs suggesting that resources were allocated similarly to each egg within the clutch. Overall, we found little evidence for a significant role of antioxidant and isotopic compositions to explain differences in terms of embryo/chick development between eggs in crested penguins. However, since our results suggest a constant rate of antioxidant transfer from females to eggs, limiting the mass of the first-laid egg might represent a strategy for females to spare antioxidant defences and preserve self-maintenance.

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Plasticity in foraging behaviour and diet buffers effects of inter-annual environmental differences on chick growth and survival in southern rockhopper penguins Eudyptes chrysocome chrysocome

Cited by 15 publications

References 73 publications

Plasticity in the foraging behavior of male Southern Rockhopper Penguins (Eudyptes chrysocome) during incubation in the Falkland/Malvinas Islands

Plasticity in the foraging behavior of male Southern Rockhopper Penguins (Eudyptes chrysocome) during incubation in the Falkland/Malvinas Islands

Foraging plasticity of breeding Northern Rockhopper Penguins, Eudyptes moseleyi, in response to changing energy requirements

Extreme intra-clutch egg size dimorphism is not coupled with corresponding differences in antioxidant capacity and stable isotopes between eggs

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