Food resource utilisation by the Magellanic penguin evaluated through stable-isotope analysis: segregation by sex and age and influence on offspring quality

By Manuel Guillermo Forero, Keith A. Hobson, G. Bortolotti, J. Donázar, M. Bertellotti, G. Blanco. 2002

207 citations recorded by the source corpus.

Subfields: Ecology, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/9e1cc52975dab5484a21545619ca84b69198dd4a

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Citations in the corpus

Age and sexual differences in the exploitation of two anthropogenic food resources for an opportunistic seabird (2010, background): “…since sexual dimorphism in Audouin’s gull is very low (but see Gray and Hamer 2001); it is also expected that chicks will be fed with prey of a higher energetic content (in our case, small pelagic Wsh) than those consumed by adults (Pedrocchi et al. 1996; Forero et al. 2002; Navarro et al. 2009).”
Resource partitioning within a tropical seabird community: new information from stable isotopes (2008, background): “Interestingly, immature great frigatebirds had intermediary δ13C and δ15N values and segregated from adults by feeding at a lower trophic level, as previously found in the only seabird species so far investigated—the Magellanic penguin (Forero et al. 2002).”
High trophic overlap within the seabird community of Argentinean Patagonia: a multiscale approach (2004, methodology): “Stable-isotope signatures of whole blood represent dietary information for a period of at least 4 weeks (Hobson & Clark 1992), thus being a valuable tissue for studying feeding ecology during discrete periods without the need to sacrifice birds (Hodum & Hobson 2000; Forero et al . 2002a, 2002b ).”
HOW DO MAGELLANIC PENGUINS COPE WITH VARIABILITY IN THEIR ACCESS TO PREY (2005, background): “Certainly, colonies in the south of the distributional range were densely populated as early as the 1930s (Murphy 1936) and there is apparently substantial conspecific food competition in larger colonies (Forero et al. 2002) that might have facilitated emigration.”
Stable isotopes reveal trophic segregation by sex and age in the southern giant petrel in two different food webs (2005, background): “In contrast, anchovy Engraulis anchoita constitutes the main food of penguins in Patagonia (Forero et al. 2002), with greater isotopic values than Antarctic krill (2.3 vs. 3.3; Sanger 1987, Hodum & Hobson 2000, Forero et al. 2004).”
Sex-specific foraging behaviour in northern gannets Morus bassanus: incidence and implications (2012, methodology): “…species (Caut et al. 2009), we calculated average values from multiple studies of piscivorous birds (Hobson & Clark 1992, Thompson et al. 1999, Bearhop et al. 2002, Forero et al. 2002, Cherel et al. 2005) to generate TEFs to inform our model: 2.25 (±0.61) for nitrogen and 0.24 (±0.79) for carbon.”
CONSPECIFIC FOOD COMPETITION EXPLAINS VARIABILITY IN COLONY SIZE: A TEST IN MAGELLANIC PENGUINS (2002, background): “Previous research showed that d15N and d13C values did not differ between the two years, but significant sexual differences existed in adults but not in chicks (Forero et al. 2002).”
Trophic relationships of exotic anadromous salmonids in the southern Patagonian Shelf as inferred from stable isotopes (2008, methodology): “SIA has been extensively used in salmon (Satterfield and Finney 2002; Schindler et al. 2003), marine mammal, and seabird ecology studies (Hobson et al. 1996; Forero et al. 2002).”
On the Use of Stable Isotopes in Trophic Ecology (2011, background): “…1992 Taxonomic identity Vanderklift & Ponsard 2003 Symbionts and parasites Miura et al. 2006 Migratory status Hobson 1999 Intraspecific competition Forero et al. 2002 Properties of the resource Lipid content Gaye-Siessegger et al. 2004 Protein content Kelly & Martinez del Rio 2010 Elemental…”
From lavage to lipids: Estimating diets of seabirds (2012, unknown): “…niche space (Bearhop et al. 2004, Newsome et al. 2007), and allows estimation of niche segregation or overlap among species, sexes, or age groups (e.g. Forero et al. 2002, 2005), and potentially, niche changes seasonally, spatially, or in re - sponse to changes in resource availability.”
Changes in diet and trophic position of a top predator 10 years after a mass mortality of a key prey (2010, background): “Measurements of the stable isotope ratios of carbon (d13C) and nitrogen (d15N) can provide trophic-level and space-use information of consumers in marine foodwebs (Hobson and Welch, 1992; Forero et al., 2002; Hobson et al., 2002).”
Sexual segregation in distribution, diet and trophic level of seabirds: insights from stable isotope analysis (2011, result): “In contrast to results for Southern Ocean albatrosses, the proximate mechanism in the other sexually size dimorphic taxa is more likely to be size-related behavioural dominance or competitive exclusion, or possibly habitat specialisation as larger birds with bigger bills can potentially handle large”
Marine birds and harmful algal blooms: sporadic victims or under-reported events? (2003, background): “Small filter-feeding fish such as anchovy and invertebrates like squid are an important part of the diet of many seabirds including penguins (Forero et al., 2002) and extensive blooms of Alexandrium tamarenseand A. catenella have been recorded from these regions.”