Population regulation of territorial species: both site dependence and interference mechanisms matter

Nevoux, Marie; Giménez, Olivier; Arlt, Debora; Nicoll, Malcolm A. C.; Jones, Carl G.; Norris, Ken

doi:10.1098/rspb.2010.2352

Cited by 35 publications

(51 citation statements)

References 48 publications

(122 reference statements)

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“…Negative density-dependence of fecundity and survival is likely the result of increased interference competition at high population densities17202122. In Savannah sparrows, as in most songbirds, males establish and defend breeding territories.…”

Section: Resultsmentioning

confidence: 99%

Winter temperatures limit population growth rate of a migratory songbird

et al. 2017

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Understanding the factors that limit and regulate wildlife populations requires insight into demographic and environmental processes acting throughout the annual cycle. Here, we combine multi-year tracking data of individual birds with a 26-year demographic study of a migratory songbird to evaluate the relative effects of density and weather at the breeding and wintering grounds on population growth rate. Our results reveal clear support for opposing forces of winter temperature and breeding density driving population dynamics. Above-average temperatures at the wintering grounds lead to higher population growth, primarily through their strong positive effects on survival. However, population growth is regulated over the long term by strong negative effects of breeding density on both fecundity and adult male survival. Such knowledge of how year-round factors influence population growth, and the demographic mechanisms through which they act, will vastly improve our ability to predict species responses to environmental change and develop effective conservation strategies for migratory animals.

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Section: Resultsmentioning

confidence: 99%

Winter temperatures limit population growth rate of a migratory songbird

et al. 2017

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“…, Nevoux et al . ), given the high productivity in the population. Behavioural interference is a more likely mechanism, as shown in an Osprey population in Corsica (Bretagnolle et al .…”

Section: Discussionmentioning

confidence: 99%

The demography of a newly establishedOspreyPandion haliaetuspopulation inFrance

Wahl

Barbraud

2013

Ibis

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Using long‐term mark–resighting data acquired over 27 years in continental France, we estimated demographic parameters and modelled the dynamics of a newly established population of Ospreys Pandion haliaetus using a life‐history model. We then performed prospective and retrospective analyses to estimate the sensitivity of the population growth rate to demographic parameters, and to quantify their contribution to the observed variation in abundance. The observed population growth rate was estimated at 1.150 (from one to 38 pairs in the period 1985–2011), and the stochastic population growth rate was estimated at 1.156. The number of fledglings per nest made the largest contribution to the variance of the observed population growth rate. Breeding productivity was stable across years. In contrast, the prospective analysis indicated that the sensitivity of the population growth rate was greatest for immigration and adult survival. Our results suggest that the increase of a new and recently established breeding population of Ospreys was mainly driven by local dynamics (high productivity and high proportion of breeding individuals), with no sign of density‐dependence except for juvenile survival. This probably reflects highly favourable conditions for breeding. Our results show that productivity can be a major driver in recovering raptor populations, and conservation work should aim to protect occupied nest‐sites and their surrounding habitat and to maintain highly favourable foraging areas in the vicinity of breeding sites.

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“…Hence, mosaics of varying habitat quality do not necessarily exhibit spatial source-sink dynamics. Temporal source-sink dynamics, where density-dependent factors act irrespective of habitat quality, also need to be considered (Nevoux et al 2011). Future studies should also consider that individual distributions most likely fall in a continuum between IDD to IFD rather than being either one or the other (Ridley et al 2004).…”

Section: Resultsmentioning

confidence: 99%

“…habitat matching rules; Morris 1994). Under an IFD, population regulation is more likely to be driven by density-dependent factors acting simultaneously on different vital rates, irrespective of habitat quality (Nevoux et al 2011; see also Morris 1994). There is also evidence that despotic behavior may not necessarily result in an ideal despotic distribution as it may not prevent per capita productivity of individuals in good quality habitat from being density dependent, owing to variation in territory size (Ridley et al 2004).…”

Section: Introductionmentioning

confidence: 99%

Experimental evidence for an ideal free distribution in a breeding population of a territorial songbird

Haché¹,

Villard²,

Bayne³

2013

Ecology

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Abstract. According to the ideal despotic distribution (IDD), dominant individuals gain a fitness advantage by acquiring territories that are of higher quality, thereby forcing other individuals into lower quality habitat. In contrast, the ideal free distribution (IFD) predicts that local density is a function of habitat quality, but that individuals achieve the same fitness in different habitat types as a result of density-dependent variation in territory size. Although the IFD represents an alternative, population dynamics of territorial species are generally expected to be driven by an IDD. We tested the predictions of IFD and IDD by monitoring the demographic response of the Ovenbird (Seiurus aurocapilla) to selection harvesting (30-40% tree removal) during the first five years postharvest in five pairs of 25-ha study plots, each comprising a control (undisturbed) and a treatment (harvested plot). In the first year following harvesting, Ovenbird territory size increased in treatment plots relative to controls, whereas density, productivity per unit area, and the abundance of litter invertebrates decreased. Treatment effects declined consistently as stands regenerated, and most effects were no longer significant by the fifth year postharvest. However, there was no treatment effect on daily nest survival rate nor on per capita productivity. These results are consistent with the IFD, whereby similar per capita productivity is achieved across habitat types through density adjustments facilitated by changes in territory size. To our knowledge, this is the first study providing evidence for an IFD in a territorial bird species.

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Population regulation of territorial species: both site dependence and interference mechanisms matter

Cited by 35 publications

References 48 publications

Winter temperatures limit population growth rate of a migratory songbird

Winter temperatures limit population growth rate of a migratory songbird

The demography of a newly establishedOspreyPandion haliaetuspopulation inFrance

Experimental evidence for an ideal free distribution in a breeding population of a territorial songbird

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