Parental nepotism enhances survival of retained offspring in the Siberian jay

Ekman, Jan; Bylin, Anders; Tegelström, Håkan

doi:10.1093/beheco/11.4.416

Cited by 95 publications

(47 citation statements)

References 23 publications

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“…Nepotistic parents selectively provide protection and favours to retained offspring in several species (Scott 1980; Barkan et al . 1986; Ekman, Sklepkovych & Tegelström 1994), and in the Siberian jay there are direct fitness gains for retained offspring from parental nepotism in enhanced survival during the first winter (Ekman, Bylin & Tegelström 2000). Such benefits that are gained in the natal territory will be complementary to ‘ecological constraints’ (Koenig et al .…”

Section: Discussionmentioning

confidence: 99%

“…For several reasons, delayed dispersal is a first‐hand choice that confers an enhanced lifetime reproductive success. As a consequence of associating with nepotistic parents, retained offspring have a higher probability of surviving to acquire reproductive status (Ekman, Bylin & Tegelström 2000). Furthermore, they breed with higher probability for nests to be successful and, despite their postponed dispersal, retained offspring have more reproductive events in life than offspring dispersing in their first year (Ekman, Bylin & Tegelström 1999).…”

Section: Introductionmentioning

confidence: 99%

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Queuing for preferred territories: delayed dispersal of Siberian jays

Ekman

Eggers

Griesser

et al. 2001

Journal of Animal Ecology

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1.Siberian jays ( Perisoreus infaustus ) can acquire breeding status along two routes. Some offspring dispersed in their first summer of life, but one-third of birds ringed as nestlings (39 of 117; 40 broods) postponed dispersal beyond their first winter and up to 3 years of age. 2. Birds dispersing in their first summer were able to settle in flocks outside their natal territory, while retained offspring appeared to be queuing for territorial vacancies in highquality habitat rather than claiming one of the currently available vacancies of low quality. 3. Males dispersing in their first year acquired territories close to human settlements, and with few low spruces. Reproductive success was low in those territories. Males with delayed dispersal acquired territories further away from human settlements and with a high density of low spruces (< 15 m). Reproductive success was high in such territories. 4. A preference of all birds for territories characterized by high reproductive success, regardless of their timing of dispersal, suggests a causal relationship to habitat characteristics. A non-breeding surplus of retained offspring had priority to vacancies at high densities and these birds claimed territories where reproductive success was high. At low densities and without a non-breeding surplus it was possible for birds dispersing as yearlings to shift territory, and acquire vacant sites of higher quality. It was birds settled in the territories with lowest reproductive success which shifted, and at low population density their territories remained vacant. 5. Siberian jays postponed dispersal as a strategic trade-off, where they forego dispersal options of low quality while queuing for high-quality habitat. However, a nepotistic parental behaviour towards retained offspring implies that fitness gains of delayed dispersal is not only a question of habitat quality.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Queuing for preferred territories: delayed dispersal of Siberian jays

Ekman

Eggers

Griesser

et al. 2001

Journal of Animal Ecology

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“…Smith (1997) (Piechocki 1977). Where dispersal costs are high, natal philopatry can be a viable strategy in improving recruitment success of a territory owner's offspring by allowing the offspring a safe 'haven' from which to find a breeding vacancy (Stacey and Ligon 1987;Ekman et al 1999;Ekman et al 2000;Kokko and Ekman 2002). Thus kinselection can operate between parents and their philopatric offspring without any benefit through cooperative breeding.…”

Section: The Echo Of Reproductionmentioning

confidence: 99%

Territory and group sizes in Eurasian beavers (Castor fiber): echoes of settlement and reproduction?

Campbell

Rosell

Nolet

et al. 2005

Behav Ecol Sociobiol

118

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According to current theories of territoriality, an animal is expected to defend the smallest area that can provide resources for maximisation of reproduction, known as the 'economically defendable' area. In group territorial species however, the strategies behind resource defence are likely to be more complex with corporate territoriality, cooperative breeding, delayed dispersal and intra-group competition all potentially playing a role. Here we examined group territoriality in a social herbivorous rodent, the Eurasian beaver Castor fiber. Beavers in our study do not inhabit economically defendable territories. Instead the sequence of arrival of pairs into unoccupied areas seems to play a more important role in determining the size of the territory, whereas group size is determined by past reproductive success. We argue that the settlement pattern and reproductive history have a lasting impact in the territorial system of beavers due to a combination of the low adult mortality, high dispersal costs, and avoidance of resource depletion.

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“…However, in some cases mature offspring may delay dispersal and use their natal territory as a "safe haven" while they wait for a breeding position to become available [Emlen, 1982;Koenig et al, 1992;Ekman et al, 2000;Kokko and Ekman, 2002]. Delayed dispersal, coupled with changing social environments following immigration, can sometimes lead to breeding opportunities within the natal group without concomitant inbreeding [Arnold, 1990;Piper and Slater, 1993;Emlen, 1995;Eikenaar et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

Delayed Dispersal and Immigration in Equatorial Sakis (Pithecia aequatorialis): Factors in the Transition from Pair- to Group-Living

Porter¹,

Grote²,

Isbell³

et al. 2017

IJFP

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Saki monkeys (Pithecia spp.) live in pairs and small groups, sometimes with more than 1 same-sex adult. Previous studies have not been able to distinguish additional, unrelated adults from adult-sized offspring, but both can influence social relationships and mating strategies, albeit in different ways. In this study, we documented the immigration of an adult male equatorial saki (P. aequatorialis) into a group following the departure of the previous resident male. At immigration, the group contained an adult female, her 5-year-old (adult age) and 1.5-year-old daughters, and her 1-month-old infant. We used nearest neighbor, approach, grooming, playing, aggression, and copulation data to describe the social dynamics between the immigrant male and the 2 adult females. In the 12 months following his arrival, the immigrant male tended to be closer to and groom the adult daughter more than the mother, but he mated with both females. Both females interacted more with the immigrant male than with each other, and both females eventually reproduced. These observations provide evidence that in equatorial sakis, adult offspring may delay dispersal and reproduce within their natal group, thus transitioning from groups of reproductive pairs to groups with more than 1 reproductive adult of the same sex.

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Parental nepotism enhances survival of retained offspring in the Siberian jay

Cited by 95 publications

References 23 publications

Queuing for preferred territories: delayed dispersal of Siberian jays

Queuing for preferred territories: delayed dispersal of Siberian jays

Territory and group sizes in Eurasian beavers (Castor fiber): echoes of settlement and reproduction?

Delayed Dispersal and Immigration in Equatorial Sakis (Pithecia aequatorialis): Factors in the Transition from Pair- to Group-Living

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