Exploiting the closest productive area: geographical segregation of foraging grounds in a critically endangered seabird

Louzao, Maité; Navarro, Joan; Forero, Manuela G.; Igual, José Manuel; Genovart, Meritxell; Hobson, Keith A.; Oro, Daniel

doi:10.3354/meps09126

Cited by 29 publications

(26 citation statements)

References 43 publications

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“…For example, Ramos et al (2011) were able to predict how management strategies would impact different colonies of yellow-legged gull Larus michahellis, through an inter-colony comparison of stable isotopes in feathers. Critically endangered Balearic shearwaters Puf finus mauretanicus showed geographic variation in stable isotopes of feathers, which gave support for particular foraging areas to become Marine Protected Areas (Louzao et al 2011). Maranto et al (2011) used FA biomarkers to identify the colony origins of terns killed at inland dams as part of a lethal control program meant to protect juvenile salmonids.…”

Section: Discussionmentioning

confidence: 99%

“…These investigations followed from earlier use of isotopic analyses of marine systems (Owens 1987, reviewed by Michener & Schell 1994. Several authors have provided overviews of the use of stable isotope methods in seabird investigations (Forero & Hobson 2003, Barrett et al 2007, Bond & Jones 2009 or more general use of stable isotope techniques in avian or mammalian ecology (Inger & Bearhop 2008, Tollit et al 2010, Hobson 2011). Here we focus on recent developments and future directions emerging in this rapidly changing field of study.…”

Section: Introductionmentioning

confidence: 99%

“…Isotopes of a variety of other elements (e.g. O, H, S, Hg, Pb, Sr) can be used effectively in marine systems, especially as additional tracers of source inputs, but these applications are still relatively infrequent (Rubenstein & Hobson 2004, Hobson 2011. More recently, isotopic measurements have been used to infer migratory movements, connectivity, and seasonal interactions based largely on increasing delineation of marine isoscapes or spatial patterns in foodweb isotopic signatures across the oceans (West et al 2010).…”

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confidence: 99%

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From lavage to lipids: estimating diets of seabirds

Karnovsky¹,

Hobson²,

Iverson³

2012

Mar. Ecol. Prog. Ser.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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From lavage to lipids: estimating diets of seabirds

Karnovsky¹,

Hobson²,

Iverson³

2012

Mar. Ecol. Prog. Ser.

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“…Marine productivity.-Among different oceanographic features commonly used for identifying highly productive hotspots, chlorophyll-a concentrations (mg/m 3 ), sea-surface temperature (8C) and bathymetry (m) are widely considered as the most biologically relevant and readily measured. In particular, chlorophyll-a can be considered a reliable surrogate of marine productivity and, consequently, of prey abundance, whereas sea-surface temperature and bathymetry may provide relevant information on physical processes or oceanographic features driving prey distribution (Acha et al 2004, Yen et al 2004, Pinaud et al 2005, Louzao et al 2011b, Louzao et al 2012. Here, we used Aqua MODIS (4 3 4 km resolution) derived winter composites (i.e., austral summers) to extract information on chlorophyll-a and sea-surface temperature for the area and breeding season (2003)(2004) of interest.…”

Section: Environmental Predictorsmentioning

confidence: 99%

Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin

et al. 2014

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Abstract. Understanding how top predators respond to natural and anthropogenically induced changes in their environment is a major conservation challenge especially in marine environments. We used a multidisciplinary approach to explore the mechanisms through which a typical central-place forager, the Magellanic penguin (Spheniscus magellanicus) from the Chubut province of Argentina, responds to variations in oceanic conditions and prey resources. We combined habitat and species distribution modeling with isotopic dietary reconstructions based on blood d 13 C and d 15N values to quantify the role of bathymetry, sea-surface temperature and chlorophyll-a concentration, abundance of conspecifics, and extent of fisheries activities in explaining the foraging and feeding ecology of individuals breeding at different colonies. The at-sea distribution of penguins was tightly coupled with the spatial distribution of their staple prey species, anchovies (Engraulis anchoita), especially in areas over the continental shelf (.200 m depth), with relatively warm water (from 168 to 218C), and moderate abundances of conspecifics (from 50 to 250 individuals). Competition with conspecifics and human fisheries were also identified as important factors explaining penguin diet with decreasing relative contributions of anchovies with increasing abundance of conspecifics and fishing activity. Our multifactorial approach allowed us to simultaneously explore different physical, biological and anthropogenic features likely affecting marine resource availability, and, consequently, driving the feeding and foraging ecology of this central-place forager. Our approach can be extended to a large suite of central-place foragers, thus providing important advances in the way we investigate how to effectively conserve and manage these species.

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“…The recurrent use of similar areas may increase familiarity with feeding conditions, including fine-scale resource availability and distribution (Hamer et al 2007, Ramírez et al 2016. Marine predators will often target regions characterised by local physical features or processes, including eddies, frontal systems, upwelling zones and shelf breaks, that increase primary production or serve to aggregate various types of prey (Kappes et al 2010, Louzao et al 2011, Pinet et al 2011, Baylis et al 2012, Arthur et al 2015, Wakefield et al 2015. Foraging behaviour and diet specialisations may therefore emerge as a result of the spatial and temporal availability and predictability of prey (Woo et al 2008, Navarro & González-Solís 2009, Patrick et al 2015, Sommerfeld et al 2015.…”

Section: Introductionmentioning

confidence: 99%

Methods for detecting and quantifying individual specialisation in movement and foraging strategies of marine predators

Carneiro¹,

Bonnet‐Lebrun²,

Manica³

et al. 2017

Mar. Ecol. Prog. Ser.

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There is increasing realisation that individuals in many animal populations differ substantially in resource, space or habitat use. Differences that cannot be attributed to any a priori way of classifying individuals (i.e. age, sex and other group effects) are often termed 'individual specialisation'. The aim of this paper is to assess the most common approaches for detecting and quantifying individual specialisation and consistencies in foraging behaviour, movement patterns and diet of marine predators using 3 types of data: conventional diet data, stable isotope ratios and tracking data. Methods using conventional diet data rely on a comparison between the proportions of each dietary source in the total diet and in the diet of individuals, or analyses of the statistical distribution of a prey metric (e.g. size); the latter often involves comparing ratios of individual and population variance. Approaches frequently used to analyse stable isotope or tracking data reduced to 1 dimension (trip characteristics, e.g. maximum trip distance or latitude/longitude at certain landmarks) include correlation tests and repeatability analysis. Finally, various spatial analyses are applied to other types of tracking data (e.g. distances between centroids of distributions or migratory routes, or overlap between distributions), and methods exist to compare habitat use. We discuss the advantages and disadvantages of these approaches, issues arising from other effects unrelated to individual specialisation per se (in particular those related to temporal scale) and potential solutions.

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Exploiting the closest productive area: geographical segregation of foraging grounds in a critically endangered seabird

Cited by 29 publications

References 43 publications

From lavage to lipids: estimating diets of seabirds

From lavage to lipids: estimating diets of seabirds

Natural and anthropogenic factors affecting the feeding ecology of a top marine predator, the Magellanic penguin

Methods for detecting and quantifying individual specialisation in movement and foraging strategies of marine predators

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