Offspring genetic structure reveals mating and nest infestation behaviour of an invasive parasitic fly (Philornis downsi) of Galápagos birds

Dudaniec, Rachael Y.; Gardner, Michael G.; Kleindorfer, Sonia

doi:10.1007/s10530-009-9464-x

Cited by 32 publications

(36 citation statements)

References 50 publications

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“…Bennett and Whitworth (1991b), in an experimental study with adult flies of the genus Protocaliphora, found that adult flies do not move large distances and that new infestations occur ,50 m from where adults emerged. Dudaniec et al (2010) also found lower levels of genetic relatedness in P. downsi when nests where located in more arid environments and host nesting density was lower. Open areas of grasslands that separate patches of forest may act as barriers for botfly dispersal.…”

Section: Discussionmentioning

confidence: 73%

Botfly Parasitism Effects on Nestling Growth and Mortality of Red-Crested Cardinals

Segura¹,

Reboreda²

2011

The Wilson Journal of Ornithology

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Section: Discussionmentioning

confidence: 73%

Botfly Parasitism Effects on Nestling Growth and Mortality of Red-Crested Cardinals

Segura¹,

Reboreda²

2011

The Wilson Journal of Ornithology

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“…5) Flies entered the nest even though chicks were already parasitized and there were numerous fly larvae and eggs already present in the nest. Nest infestation by multiple P. downsi females has been confirmed by microsatellite studies (Dudaniec et al 2010); however, to our knowledge, this is the first record of a P. downsi female visiting a nest with a known number of conspecific larvae and eggs. 6) Early-instar P. downsi larvae can affect other areas of the heads of the chicks in addition to the nostrils, beak, and ears , suggesting subcutaneous habits (M. Quiroga pers.…”

mentioning

confidence: 61%

Interactions between the Avian Parasite, Philornis downsi (Diptera: Muscidae) and the Galapagos Flycatcher, Myiarchus magnirostris Gould (Passeriformes: Tyrannidae)

Lincango

Causton

Cedeño

et al. 2015

Journal of Wildlife Diseases

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ABSTRACT:An incidental observation of the fly Philornis downsi parasitizing a Galapagos Flycatcher (Myiarchus magnirostris) nest has revealed new insights into the searching behavior and biology of this invasive fly parasite and its interactions with endemic landbirds in the Galapagos Islands. Observations suggest that P. downsi relies on olfactory cues, or olfactory cues combined with the activity of adult birds, to locate nests and that flies continue to visit nests when chicks are .3 d old. At least 200 eggs were laid by P. downsi in different parts of the nest and .40 early-instar larvae were found inside the head of one chick, with additional larvae found in the base of the nest. Parasitism was the likely cause of mortality of both chicks found in or near the nest. This description of P. downsi parasitizing chicks of M. magnirostris highlights the vulnerability of this endemic bird species to this invasive fly.

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“…As P. downsi intensity increases with nestling age [40], this could bias the data. Thus, we analysed nests with chicks of 6 days and younger separately to reduce the effect of nestling age.…”

Section: Resultsmentioning

confidence: 99%

Invasive Parasites, Habitat Change and Heavy Rainfall Reduce Breeding Success in Darwin's Finches

et al. 2014

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Invasive alien parasites and pathogens are a growing threat to biodiversity worldwide, which can contribute to the extinction of endemic species. On the Galápagos Islands, the invasive parasitic fly Philornis downsi poses a major threat to the endemic avifauna. Here, we investigated the influence of this parasite on the breeding success of two Darwin's finch species, the warbler finch (Certhidea olivacea) and the sympatric small tree finch (Camarhynchus parvulus), on Santa Cruz Island in 2010 and 2012. While the population of the small tree finch appeared to be stable, the warbler finch has experienced a dramatic decline in population size on Santa Cruz Island since 1997. We aimed to identify whether warbler finches are particularly vulnerable during different stages of the breeding cycle. Contrary to our prediction, breeding success was lower in the small tree finch than in the warbler finch. In both species P. downsi had a strong negative impact on breeding success and our data suggest that heavy rain events also lowered the fledging success. On the one hand parents might be less efficient in compensating their chicks' energy loss due to parasitism as they might be less efficient in foraging on days of heavy rain. On the other hand, intense rainfalls might lead to increased humidity and more rapid cooling of the nests. In the case of the warbler finch we found that the control of invasive plant species with herbicides had a significant additive negative impact on the breeding success. It is very likely that the availability of insects (i.e. food abundance)is lower in such controlled areas, as herbicide usage led to the removal of the entire understory. Predation seems to be a minor factor in brood loss.

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Offspring genetic structure reveals mating and nest infestation behaviour of an invasive parasitic fly (Philornis downsi) of Galápagos birds

Cited by 32 publications

References 50 publications

Botfly Parasitism Effects on Nestling Growth and Mortality of Red-Crested Cardinals

Botfly Parasitism Effects on Nestling Growth and Mortality of Red-Crested Cardinals

Interactions between the Avian Parasite, Philornis downsi (Diptera: Muscidae) and the Galapagos Flycatcher, Myiarchus magnirostris Gould (Passeriformes: Tyrannidae)

Invasive Parasites, Habitat Change and Heavy Rainfall Reduce Breeding Success in Darwin's Finches

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