Avian Haematozoa: mortality and pathogenicity

Bennett, Gordon F.; Peirce, M. A.; Ashford, R. W.

doi:10.1080/00222939300770621

Cited by 236 publications

(147 citation statements)

References 29 publications

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“…They suggest that the parasite might cause juvenile mortality. However, the traditional view that blood parasites are only slightly or not pathogenic has been challenged, as recent research has revealed important alterations in infected birds (Bennett et al, 1993;Nordling et al, 1998;Raidal and Jaensch, 2000).…”

Section: Discussionmentioning

confidence: 99%

Blood Parasites in Sage-Grouse From Nevada and Oregon

Dunbar

Tornquist

Giordano

2003

Journal of Wildlife Diseases

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Peripheral blood smears from 196 adult and yearling female greater sage-grouse (Centrocercus urophasianus) were examined for blood parasites (167 from the breeding and 29 from the brood-rearing season) to determine prevalence of blood parasites, to attempt to correlate infection with chick survival, and to establish base-line values of prevalence in sage-grouse from Nevada and Oregon (USA). Birds were captured and released on two study areas during 1999-2001; Sheldon National Wildlife Refuge (SNWR) in northwestern Nevada, and Hart Mountain National Antelope Refuge (HMNAR) in southeastern Oregon. Birds from a third study area, Beaty's Butte grazing allotment (BB) in southeastern Oregon, were sampled in 2000 and 2001. Overall, 19 birds (10%) were positive for Leucocytozoon lovati (ϭL. bonasae), 1 (0.5%) for Plasmodium pedioecetii, and 2 (1%) for microfilariae. Although prevalence of L. lovati on HMNAR was 39% during the breeding season in 1999 and 100% during the brood-rearing season in 2000, statistically, prevalence of L. lovati among study areas and years was not different. However, there were statistical differences between capture periods. Overall, 31% of the hens were positive for L. lovati during the brood-rearing season compared to 6% during the breeding season. There was no difference in packed cell volume between infected and non-infected birds and no difference between age-classes. However, mean sage-grouse productivity on HMNAR was higher (1.6 chicks/hen) for non-infected (nϭ10) compared to infected hens (0.7 chicks/hen; nϭ7), during 1999. Based on these limited observations on HMNAR in 1999, the possible effects that L. lovati may have on young sage-grouse could be detrimental to sage-grouse populations in Nevada and Oregon.

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Section: Discussionmentioning

confidence: 99%

Blood Parasites in Sage-Grouse From Nevada and Oregon

Dunbar

Tornquist

Giordano

2003

Journal of Wildlife Diseases

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“…In greater sage-grouse, significant mortalities have not been well documented and most of the research conducted has centered around the effect of blood parasites (Plasmodium, Haemoproteus) on mate selection and breeding success. The traditional view that blood parasites are only slightly or not pathogenic has been challenged with recent research (Bennett et al 1993, Nordling et al 1998, Raidal and Jaensch 2000. The need for control of hemosporidiosis in greater sage-grouse populations has not been indicated.…”

Section: Predation Parasites and Pathogens 10 -5mentioning

confidence: 99%

Broad-Scale Assessment of Rangeland Health, Grand Staircase–Escalante National Monument, USA

Miller

2008

Rangeland Ecology & Management

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“…The key conjecture of most of these theories is that haematozoa are costly to their hosts. Pathogenic effects on domestic and captive avian populations are well-documented (Fallis and Bennett, 1966 ;Herman et al 1970 ;Bennett et al 1993). However, despite occasional reported negative effects on host condition and reproductive success (e.g.…”

Section: Introductionmentioning

confidence: 99%

Avian blood parasites in an endangered columbid:Leucocytozoon marchouxiin the Mauritian Pink PigeonColumba mayeri

et al. 2007

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There is increasing evidence that pathogens can play a significant role in species decline. This study of a complete freeliving species reveals a cost of blood parasitism to an endangered host, the Pink Pigeon Columba mayeri, endemic to Mauritius. We investigated the prevalence and effect of infection of the blood parasite, Leucocytozoon marchouxi, in the free-living Pink Pigeon population. Overall, L. marchouxi infection prevalence detected was 18 . 3%. Juveniles were more likely to be infected than older birds and there was geographical variation in infection prevalence. Survival of birds infected with L. marchouxi was lower than that of uninfected birds to 90 days post-sampling. This study suggests that while common haematozoa are well tolerated in healthy adults, these parasites may have greater pathogenic potential in susceptible juveniles. The study is unusual given its completeness of species sampling (96 %) within a short time-period, the accurate host age data, and its focus on blood parasites in a threatened bird species. Species for which long-term life-history data are available for every individual serve as valuable models for dissecting the contribution of particular pathogens to species decline.

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Avian Haematozoa: mortality and pathogenicity

Cited by 236 publications

References 29 publications

Blood Parasites in Sage-Grouse From Nevada and Oregon

Blood Parasites in Sage-Grouse From Nevada and Oregon

Broad-Scale Assessment of Rangeland Health, Grand Staircase–Escalante National Monument, USA

Avian blood parasites in an endangered columbid:Leucocytozoon marchouxiin the Mauritian Pink PigeonColumba mayeri

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