The Despotic Distribution and Deferred Maturity: Two Sides of the Same Coin

Ens, Bruno J.; Weissing, Franz J.; Drent, R.H.

doi:10.1086/285818

Cited by 149 publications

(159 citation statements)

References 44 publications

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“…There was also no information available on sub-adult survival for American Oystercatchers, thus sub-adult and adult survival were assumed equal (Schulte 2012). Finally, transition probability of sub-adult to adult was averaged across two studies of Eurasian Oystercatchers (Safriel et al 1984;Ens et al 1995). Mean sub-adult to adult transition probability was 0.15, which is supported by the average age of first breeding reported for Eurasian Oystercatchers (3-11 years; Schulte 2012).…”

Section: Life-stage Modelmentioning

confidence: 75%

“…Alternatively, managers could aim to increase transition rates of sub-adults to adults, thus increasing the breeding population. Ens et al (1995) have suggested that increasing the amount of high quality habitat can help contribute to an increased transition rate. Unfortunately, we do not always fully understand the habitat requirements of our target species.…”

Section: Discussionmentioning

confidence: 99%

“…However, there are no records of individuals breeding until year three, with many individuals not breeding until after their third year (Ens et al 1995;McGowan et al 2005a). We developed a three-stage, female-based matrix model to summarize demographic rates for American Oystercatchers breeding in North Carolina (Table 1).…”

Section: Life-stage Modelmentioning

confidence: 99%

“…This species is well studied ) and shares many life-history traits with American Oystercatchers. Both exhibit delayed maturity (not breeding until year three), long-distance winter migration, variable natal-site fidelity as immature individuals, and high adult survival (Ens et al 1995McGowan et al 2005a;Ens and Underhill 2014). Ens and Underhill (2014) recently published estimates for juvenile (φ j ) and immature (φ i ) survival probabilities to be 0.50 and 0.80, respectively, based on continuing studies of banded Eurasian Oystercatchers beginning in 1983.…”

Section: Life-stage Modelmentioning

confidence: 99%

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Managing American Oystercatcher(Haematopus palliatus)Population Growth by Targeting Nesting Season Vital Rates

et al. 2017

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Section: Life-stage Modelmentioning

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Section: Life-stage Modelmentioning

confidence: 99%

Section: Life-stage Modelmentioning

confidence: 99%

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Managing American Oystercatcher(Haematopus palliatus)Population Growth by Targeting Nesting Season Vital Rates

et al. 2017

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“…Nearly all the breeding birds (99.1%, n 314) remained in their territories until their death and thus never occupied vacancies in territories of higher quality where they could obtain a higher lifetime reproductive success (Komdeur 1992;Komdeur & Edelaar 2001). This in£exibility of established breeders, despite the possibility of higher reproductive success elsewhere, is common in some species (Picman 1987;Korpimaki 1988;Aebischer & Coulson 1990;Ens et al 1995), but not in others (Krebs 1971;Newton & Marquiss 1982;Beletsky & Orians 1987;Curry 1988). Kokko & Sutherland (1998) predicted that if territory`switching' is absent, the relative advantage of budding increases.…”

Section: Discussion (A) Territory Inheritance By Alloparents and Buddersmentioning

confidence: 99%

Evidence that helping at the nest does not result in territory inheritance in the Seychelles warbler

Komdeur

Edelaar

2001

Proc. R. Soc. Lond. B

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In an environment that has a shortage of territories, helping to rear younger siblings (`alloparenting') is proposed to facilitate territory acquisition in two ways: (i) through group augmentation that leads to an increase of the territory with subsequent partial inheritance (budding); and (ii) through site dominance that leads to greater success when competing for the natal or a nearby territory after the death of the territory owner (complete territory inheritance). Most young Seychelles warbler (Acrocephalus sechellensis) males either show alloparenting or budding behaviour. Future budders had signi¢cantly more aggressive interactions with neighbours and assisted their parents more with territory defence than similarly aged future alloparents or non-helpers. This led to an increase of the natal territory of future budders before actual budding took place, whereas the natal territories of future alloparents remained constant in size. Alloparents never became budders and vice versa, refuting partial inheritance as an advantage of alloparenting. Natural male breeding vacancies were never inherited by alloparents born on vacant or other territories, but were inherited by budders born on the vacant territory or, if these were absent, predominantly by budders from neighbouring territories. We o¡er explicit experimental evidence against thè helping at the nest to inherit' hypothesis. Experimentally created male breeding vacancies, with both a male alloparent and a similarly aged sibling budder present simultaneously in the vacant territory, were ¢lled by budders only. Site dominance over territory inheritance is linked to budding and not to alloparenting.

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Demographic partitioning of dynamic energy subsidies revealed with anOrnstein–Uhlenbeckspace use model

Eisaguirre

Booms

Barger

et al. 2022

Ecological Applications

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In populations across many taxa, a large fraction of sexually mature individuals do not breed but are attempting to enter the breeding population. Such individuals, often referred to as “floaters,” can play critical roles in the dynamics and stability of these populations and buffer them through periods of high adult mortality. Floaters are difficult to study, however, so we lack data needed to understand their roles in the population ecology and conservation status of many species. Here, we analyzed satellite telemetry data with a newly developed mechanistic space use model based on an Ornstein–Uhlenbeck process to help overcome the paucity of data in studying the differential habitat selection and space use of floater and territorial golden eagles Aquila chrysaetos. Our sample consisted of 49 individuals tracked over complete breeding seasons across 4 years, totaling 104 eagle breeding seasons. Modeling these data mechanistically was required to disentangle key differences in movement and particularly to separate aspects of movement driven by resource selection from those driven by use of a central place. We found that floaters generally had more expansive space use patterns and larger home ranges, as well as evidence that they partition space with territorial individuals seemingly on fine scales through differential habitat and resource selection. Floater and territorial eagle home ranges overlapped markedly, suggesting that floaters use the interstices between territories. Furthermore, floater and territorial eagles differed in how they selected for uplift variables, key components of soaring birds’ energy landscape, with territorial eagles apparently better able to find and use thermal uplift. We also found relatively low individual heterogeneity in resource selection, especially among territorial individuals, suggesting a narrow realized niche for breeding individuals, which varied from the level of among‐individual variation present during migration. This work furthers our understanding of floaters’ potential roles in the population ecology of territorial species and suggests that conserving landscapes occupied by territorial eagles also protects floaters.

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The Despotic Distribution and Deferred Maturity: Two Sides of the Same Coin

Cited by 149 publications

References 44 publications

Managing American Oystercatcher(Haematopus palliatus)Population Growth by Targeting Nesting Season Vital Rates

Managing American Oystercatcher(Haematopus palliatus)Population Growth by Targeting Nesting Season Vital Rates

Evidence that helping at the nest does not result in territory inheritance in the Seychelles warbler

Demographic partitioning of dynamic energy subsidies revealed with anOrnstein–Uhlenbeckspace use model

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