Territory Occupancy and Parental Quality as Proxies for Spatial Prioritization of Conservation Areas

Tschumi, Matthias; Schaub, Michael; Arlettaz, Raphaël

doi:10.1371/journal.pone.0097679

Cited by 20 publications

(28 citation statements)

References 32 publications

(71 reference statements)

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“…Even though their condition and physiological states might be the same, there could still be differences in reproductive performance, but we found no effects of geolocator on any component of reproductive performance, not even on finer-scale traits such as fledgling mass and food provisioning rates, contrasting with the majority of the literature (Ackerman et al 2004;Adams et al 2009;Barron et al 2010;Costantini and Møller 2013). For example, we found no difference in the onset of breeding, an important trait that is directly linked to the quality of the territory occupied and thus indirectly to reproductive success: birds that arrive later in the breeding grounds are forced to occupy lower quality territories and therefore would have a lower reproductive success (Tschumi et al 2014).…”

Section: Effects Of Geolocator On Life-history Traits For the Combinecontrasting

confidence: 99%

No detectable effects of lightweight geolocators on a Palaearctic-African long-distance migrant

et al. 2015

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Tracking devices are used in a broad range of species for a broad range of questions, but their potential effects on study species are debated. Outcomes of earlier studies on effects are equivocal: some studies find negative effects on behaviour and life history traits, while others do not. Contrasting results might be due to low sample sizes, temporal scale (no repetition of the study over multiple years) and a limited range of response variables considered. We investigated effects of geolocators on a range of response variables: body condition, physiological states, reproductive performance and, ultimately, annual apparent survival for a medium-sized Palaearctic-African long-distance migrant, the Eurasian Hoopoe Upupa epops, for the combined study period (2009)(2010)(2011)(2012)(2013)(2014) and for individual years. We investigated response variables 1 year after deployment of the geolocator and found no differences in body condition, physiological states and several components of reproductive performance between individuals with and without geolocators when data were combined. Also, apparent annual survival did not differ between geolocator and control birds. We did, however, find effects in some years possibly related to environmental stochasticity or chance events due to lower sample sizes. We argue that results of studies on the effects of tracking devices should be interpreted and generalized with great caution and suggest that future studies on the effects of tracking devices are conducted over multiple years. Future studies should also apply capture-recapture models to estimate survival, rather than focus solely on return rates.

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Section: Effects Of Geolocator On Life-history Traits For the Combinecontrasting

confidence: 99%

No detectable effects of lightweight geolocators on a Palaearctic-African long-distance migrant

et al. 2015

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“…Because males have several roles in breeding, such as territory acquisition (Tschumi et al . ) and nest defence against predators (Kryštofková et al . ), we suggest that further research should be focused on variables relevant to male quality, such as male song performance (Verhulst ) and how they relate to multiple brooding.…”

Section: Discussionmentioning

confidence: 99%

Male feeding contribution facilitates multiple brooding in a biparental songbird

Nomi

Yuta

Koizumi

2017

Ibis

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Despite the cost of lost mating opportunities, biparental care is routinely observed across different groups of animals. Theory predicts that paternal care will increase reproductive success, yet many empirical studies have failed to find a direct link. Most studies have focused on the effect of paternal care on current breeding attempts, but male contributions may benefit future reproduction. Species producing clutches or litters more than once per season (i.e. multiple breeding attempts per season) are suitable for investigating whether paternal care contributes to current or future reproductive success, or both. We investigated the importance of the male's feeding contribution to multiple brooding in Japanese Tits Parus minor in northern Japan, where approximately 50% of pairs were known to reproduce multiple times within a breeding season. Male feeding contribution (proportion of provisioning delivered by the male) was positively correlated with the probability of the female multiple brooding and with nestling body mass. However, it was not correlated with fledging success in the current breeding attempt. Our results demonstrate the importance of male parental care for annual reproductive success in this multi‐brooded species and provide insights into the evolution of biparental care.

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“…In the study area, Molecrickets Gryllotalpa gryllotalpa make up a high proportion of the prey biomass delivered to chicks (Fournier & Arlettaz 2001, Ryser et al 2016. Territories in which parents provide more Mole-crickets are occupied more often, have a higher probability of producing a second clutch, and raise more and heavier chicks (Hoffmann et al 2015, and are therefore of higher quality (Tschumi et al 2014).…”

Section: Study Speciesmentioning

confidence: 99%

“…Hoopoe territory quality can be characterized by the frequency of territory occupancy (Tschumi et al . , Guillod et al . ).…”

mentioning

confidence: 99%

“…We chose this species because Hoopoes show high variance in brood size, pronounced asynchronous hatching and have a long breeding period (Glutz von Blotzheim & Bauer 1980, Martin-Vivaldi et al 1999. Hoopoe territory quality can be characterized by the frequency of territory occupancy (Tschumi et al 2014. Our main goal was to assess whether growth of different body traits is affected by territory quality, seasonality and brood size in the same way, whether hatching asynchrony changes these relationships and how hatching asynchrony modulates energy allocation during nestling growth.…”

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The effects of hatching asynchrony on growth and mortality patterns in Eurasian Hoopoe Upupa epops nestlings

Hildebrandt

Schaub

2017

Ibis

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Growth is a fundamental life history trait in all organisms and is closely related to individual fitness. In altricial birds, growth of many traits is restricted to the short period between hatching and fledging and strongly depends on the amount of food that parents deliver and the extent of hatching asynchrony. However, empirical studies of energy allocation to growth of different body size traits as a function of hatching asynchrony are scarce. We studied growth and mortality of Eurasian Hoopoe Upupa epops, a species with a long breeding season and high brood size variance, whose nestlings show pronounced hatching asynchrony, in order to test how hatching asynchrony affects different growth traits in the context of territory quality, season and brood size. The growth of five body traits (body mass, and lengths of tarsus, third primary, bill and longest crest feather) was investigated to understand how it was affected by brood size, hatching date and order, and territory quality. In total, 241 nestlings from 39 nests were measured every 4 days in 2014 in south-western Switzerland. Brood size, hatching date and hatching order had the strongest influence on growth trajectories, although tarsus growth was only marginally affected by these variables. Nestlings that hatched earlier than their siblings were heavier and had longer third primaries, bills and crest feathers compared with later-hatched siblings. In territories of high quality, hatching order differences disappeared for body mass growth, but persisted for lengths of third primary, bill and crest feathers. Brood size was inversely associated with third primary, bill and crest feather lengths, but positively associated with body mass. Nestling mortality was higher in later-hatched nestlings and in broods that were raised in territories of lower quality. Our study shows that in nestlings, energy was allocated differentially between body traits and this allocation interacted with hatching order and territory quality. Rapid mass gain by nestlings was prioritized in order to increase competitive ability. Our results provide support for the brood reduction hypothesis as an explanation of hatching asynchrony in Hoopoes.

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Territory Occupancy and Parental Quality as Proxies for Spatial Prioritization of Conservation Areas

Cited by 20 publications

References 32 publications

No detectable effects of lightweight geolocators on a Palaearctic-African long-distance migrant

No detectable effects of lightweight geolocators on a Palaearctic-African long-distance migrant

Male feeding contribution facilitates multiple brooding in a biparental songbird

The effects of hatching asynchrony on growth and mortality patterns in Eurasian Hoopoe Upupa epops nestlings

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