Influence of food availability on demography and local population dynamics in a long-lived seabird

Oro, Daniel; Cam, Emmanuelle; Pradel, Roger; Martínez‐Abraín, Alejandro

doi:10.1098/rspb.2003.2609

Cited by 162 publications

(162 citation statements)

References 68 publications

(84 reference statements)

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“…With limited area available for movement and foraging, primates turn to anthropogenic food sources, such as provisioned feeding spots or crop raiding, to survive within a highly humanized environment (Hoffman and O'Riain 2012). Food availability has been shown to be a key factor contributing to group dynamics, most notably population size and structure, as well as aggressive interactions among conspecifics (Chapman et al 2015;Oro et al 2004). As food provisioning in the urban habitat provides a constant source of nutrition, this can have a considerable impact on population ecology (Altmann and Muruthi 1988;Hill 1999).…”

Section: Introductionmentioning

confidence: 99%

The hustle and bustle of city life: monitoring the effects of urbanisation in the African lesser bushbaby

Scheun

Bennett

Ganswindt

et al. 2015

Sci Nat

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Urbanisation has become a severe threat to pristine natural areas, causing habitat loss and affecting indigenous animals. Species occurring within an urban fragmented landscape must cope with changes in vegetation type as well as high degrees of anthropogenic disturbance, both of which are possible key mechanisms contributing to behavioural changes and perceived stressors. We attempted to elucidate the effects of urbanisation on the African lesser bushbaby, Galago moholi, by (1) recording activity budgets and body condition (body mass index, BMI) of individuals of urban and rural populations and (2) further determining adrenocortical activity in both populations as a measure of stress via faecal glucocorticoid metabolite (fGCM) levels, following successful validation of an appropriate enzyme immunoassay test system (ACTH challenge test). We found that both sexes of the urban population had significantly higher BMIs than their rural counterparts, while urban females had significantly higher fGCM concentrations than rural females. While individuals in the urban population fed mainly on provisioned anthropogenic food sources and spent comparatively more time resting and engaging in aggressive interactions, rural individuals fed almost exclusively on tree exudates and spent more time moving between food sources. Although interactions with humans are likely to be lower in 2 nocturnal than in diurnal species, our findings show that the impact of urbanisation on nocturnal species is still considerable, affecting a range of ecological and physiological aspects.

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Section: Introductionmentioning

confidence: 99%

The hustle and bustle of city life: monitoring the effects of urbanisation in the African lesser bushbaby

Scheun

Bennett

Ganswindt

et al. 2015

Sci Nat

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“…Especially for top predators such as seabirds, such fluctuations in prey species may have negative effects on both survival and reproduction (Lack 1968, Cairns 1992, Furness 2003, Oro et al 2004, Cury et al 2011) and in some cases may even drive populations towards extinction (Erikstad et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Prey density in non-breeding areas affects adult survival of black-legged kittiwakes Rissa tridactyla

Reiertsen¹,

Erikstad²,

Anker‐Nilssen³

et al. 2014

Mar. Ecol. Prog. Ser.

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In migratory birds, environmental conditions in both breeding and non-breeding areas may affect adult survival rates and hence be significant drivers of demographic processes. In seabirds, poor knowledge of their true distribution outside the breeding season, however, has severely limited such studies. This study explored how annual adult survival rates of black-legged kittiwakes Rissa tridactyla on Hornøya in the southern Barents Sea were related to temporal variation in prey densities and climatic parameters in their breeding and non-breeding areas. We used information on the kittiwakes' spatiotemporal distribution in the non-breeding season gained from year-round light-based tracking devices (geolocators) and satellite transmitters, and kittiwake annual adult survival rates gained from a multistate capture-mark-recapture analysis of a 22 yr time series of colour-ringed kittiwakes. In the post-breeding period, kittiwakes concentrated in an area east of Svalbard, in the winter they stayed in the Grand Banks/Labrador Sea area, and in the pre-breeding period they returned to the Barents Sea. We identified 2 possible prey categories of importance for the survival of kittiwakes in these areas (sea butterflies Thecosomata in the Grand Banks/Labrador Sea area in winter and capelin Mallotus villosus in the Barents Sea in the pre-breeding season) that together explained 52% of the variation in adult survival rates. Our results may have important implications for the conservation of kittiwakes, which are declining globally, because other populations use the same areas. Since they are under the influence of major anthropogenic activities including fisheries, international shipping and the offshore oil and gas industry, both areas should be targeted for future management plans.KEY WORDS: Black-legged kittiwake · Pteropods · Capelin · Capture-mark-recapture analyses · Non-breeding distributionResale or republication not permitted without written consent of the publisher FREE REE

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“…Food is a key factor shaping population dynamics. Density dependence and climate, which regulate food availability, are likely to be crucial during these two life phases [20]. We predicted that individuals belonging to cohorts experiencing harsh environmental conditions during its first year (i.e.…”

Section: Introductionmentioning

confidence: 99%

Consecutive cohort effects driven by density-dependence and climate influence early-life survival in a long-lived bird

Payo‐Payo

Genovart

Bertolero³

et al. 2016

Proc. R. Soc. B.

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Conditions during early life, including maternal cohort effects, can influence the future fitness of individuals. This may be particularly true for longdistance migrating birds, because, apart from conditions experienced by cohorts during rearing, conditions during early life in regions far from breeding grounds may also influence their population dynamics. Very little is known about the fitness consequences of those conditions experienced by juveniles after independence, especially in wild populations and for longlived birds. We used multi-event capture-recapture-recovery models and a unique 26-year dataset for the Audouin's gull (Larus audouinii) to assess for the first time whether survival was influenced by early conditions, both during the rearing period (i.e. a maternal cohort effect potentially affected by density dependence) and the first winter (i.e. a cohort effect driven by climate when birds disperse to wintering grounds). Our results show that juvenile survival was highly sensitive to early-life conditions and that survival decreased with stronger density dependence and harsh climate. The two consecutive cohort effects were of similar magnitude and they may represent a selection filter. Thus, early-life conditions had a strong impact on survival, and neglecting this complexity may hinder our understanding on how populations of long-lived animals fluctuate and respond to perturbations.

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Influence of food availability on demography and local population dynamics in a long-lived seabird

Cited by 162 publications

References 68 publications

The hustle and bustle of city life: monitoring the effects of urbanisation in the African lesser bushbaby

The hustle and bustle of city life: monitoring the effects of urbanisation in the African lesser bushbaby

Prey density in non-breeding areas affects adult survival of black-legged kittiwakes Rissa tridactyla

Consecutive cohort effects driven by density-dependence and climate influence early-life survival in a long-lived bird

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