Pathogenic bacteria and timing of laying

Møller, Anders Pape; Soler, Juan José; Nielsen, Jan Tøttrup; Galván, Ismael

doi:10.1002/ece3.1473

Cited by 11 publications

(8 citation statements)

References 49 publications

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“…Our results show a negative relationship between bacterial load (both TCB and FDB) and hatching date in females on day 13 which was not apparent on day 1. Our findings are in contrast with the results of Møller et al () and Soler et al (), who both found positive associations between bacterial density and laying date in skin bacteria (i.e. beak and claws of goshawks Accipiter gentilis ) and egg bacteria (i.e.…”

Section: Discussioncontrasting

confidence: 99%

Cohabitation with farm animals rather than breeding effort increases the infection with feather‐associated bacteria in the barn swallow Hirundo rustica

Fülöp

Vágási

Pap

2017

Journal of Avian Biology

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Feather-associated bacteria are widespread inhabitants of avian plumage. However, the determinants of the between-individual variation in plumage bacterial loads are less well understood. Infection intensities can be determined by ecological factors, such as breeding habitat, and can be actively regulated by hosts via preening. Preening, yet, is a resource intensive activity, and thus might be traded-off against reproductive investment in breeding birds. Here, we studied barn swallows Hirundo rustica to assess the bacterial cost of reproduction in relation to nesting site micro-habitats. Barn swallows prefer to breed in the company of large-sized farm animals, although the presence of mammalian livestock in barns assures a warm and humid micro-climate that favours bacterial proliferation. Thus, we experimentally manipulated brood sizes of birds breeding in barns with, or without, farm animals and measured total cultivable bacteria (TCB) and feather-degrading bacteria (FDB) from the plumage. We found that the abundance of feather-associated bacteria (i.e. both TCB and FDB) in females, but not males, breeding in barns with livestock were significantly higher than in conspecifics breeding in empty barns. Plumage bacterial loads, however, were not affected by brood size manipulations in either sex. In addition, we report a negative relationship between both TCB and FDB and hatching date in females, and several sex and seasonal differences in plumage bacterial abundances. Our study is the first to show that breeding micro-habitat (i.e. livestock co-tenancy) has consequences for the abundance of feather-associated bacteria.

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Section: Discussioncontrasting

confidence: 99%

Cohabitation with farm animals rather than breeding effort increases the infection with feather‐associated bacteria in the barn swallow Hirundo rustica

Fülöp

Vágási

Pap

2017

Journal of Avian Biology

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“…A subsequent analysis revealed that the abundance of bacteria on the feathers of individual prey was considerably larger than that of individual non-prey ( Møller et al 2012 ). Microorganisms partly derived from prey also seem to play a role in delayed laying of their goshawk hosts ( Møller et al 2015 ), perhaps because adults in poor condition start to reproduce later ( Soler et al 2015 ). This has consequences for hatching success ( Møller et al 2010b ) and survival prospects ( Møller et al 2013 ; Benskin et al 2015 ).…”

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confidence: 99%

Recapture probability, flight morphology, and microorganisms

2017

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Microorganisms on and within organisms are ubiquitous and interactions with their hosts range from mutualistic over commensal, to pathogenic. We hypothesized that microorganisms might affect the ability of barn swallows Hirundo rustica to escape from potential predators, with positive associations between the abundance of microorganisms and escape ability implying mutualistic effects, while negative associations would imply antagonistic effects. We quantified escape behavior as the ability to avoid capture in a mist net and hence as a small number of recaptures. Because recapture probability may also depend on timing of reproduction and reproductive success, we also tested whether the association between recapture and microorganisms was mediated by an association between recapture and life history. We found intermediate to strong positive relationships between recapture probability and abundance of Bacillus megaterium, but not abundance of other bacteria or fungi. The abundance of B. megaterium was associated with an advance in laying date and an increase in reproductive success. However, these effects were independent of the number of recaptures. This interpretation is supported by the fact that there was no direct correlation between laying date and reproductive success on one hand and the number of recaptures on the other. These findings have implications not only for predator–prey interactions, but also for capture-mark-recapture analyses of vital rates such as survival and dispersal.

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“…had nested in the boxes. Reused nests may harbor pathogenic bacteria originating from food waste, feces, and the feather sheaths of earlier broods (Møller et al 2015). Parental incubation may reduce microbial infection by keeping the eggs dry (D'Alba et al 2010).…”

Section: Discussionmentioning

confidence: 99%

Incubation Onset Influences Maternal Investment in Eggs and Egg and Nestling Survival in an Altricial Bird

Kato

Matsui

Kutsukake

et al. 2021

Preprint

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Many birds initiate incubation before clutch completion which results in asymmetric survival of eggs and nestlings within the clutch. When parents start incubating before clutch completion, low survival is expected of the nestlings hatched from eggs laid after the onset of incubation due to hatching asynchrony. Conversely, eggs laid before the onset of incubation may have a lower survival because of extrinsic factors (e.g. ambient temperature and microbial infection). Many studies investigating the allocation of parental investment have hypothesized two different strategies wherein parents allocate investment that favors eggs/nestlings with high survival prospects or compensates for the disadvantages of eggs/nestlings with low survival prospects. Although birds could take different strategies based on incubation onset within the same breeding attempt, this idea has never been tested. We conducted an observational study to investigate the effects of incubation onset on the survival of eggs laid before and after incubation onset and parental egg allocation in the altricial wryneck Jynx torquilla. We found that survival decreased in the eggs laid earlier or later than the day of incubation onset within the clutch. Because egg volume increased with laying sequence, egg volume and the survival of eggs laid before incubation onset were positively associated, whereas egg volume and the survival of eggs laid after incubation onset were negatively associated. Furthermore, late-hatching nestlings grew to similar weights to early-hatching nestlings. These suggest that females proportionately invested in egg size before incubation onset, but that investment in egg size after incubation onset was compensatory. Our observational study proposes a possibility that female wrynecks adopt two different investment strategies before and after incubation onset during a breeding attempt.

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Pathogenic bacteria and timing of laying

Cited by 11 publications

References 49 publications

Cohabitation with farm animals rather than breeding effort increases the infection with feather‐associated bacteria in the barn swallow Hirundo rustica

Cohabitation with farm animals rather than breeding effort increases the infection with feather‐associated bacteria in the barn swallow Hirundo rustica

Recapture probability, flight morphology, and microorganisms

Incubation Onset Influences Maternal Investment in Eggs and Egg and Nestling Survival in an Altricial Bird

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