Apparent Absence of Blood Parasites in the Patagonian Seabird Community: Is it Related to the Marine Environment?

-The geographic and specific distribution of avian Haematozoa is poorly understood and much basic information is still needed. Studies of blood parasites in avian communities are scarce despite of their potential for disentangling the relative importance of host-specific and ecological factors shaping blood parasite distributions. Here we present the first study of blood parasites in a breeding community of seabirds by scanning blood smears obtained from 560 birds belonging to 13 species breeding in Patagonia, Argentina. Seven of these species have not been sampled previously for blood parasites. No blood parasites were detected. The scarcity of vectors due to the marine environment and the dry conditions around the colonies is the most plausible hypothesis for explaining the apparent absence of blood parasites in the Patagonian seabird community, although other hypotheses should be examined. Received 12 December 2000, accepted 8 May 2001.

[1]  J. Donázar,et al.  Offspring body condition and immunocompetence are negatively affected by high breeding densities in a colonial seabird: a multiscale approach , 2001, Proceedings of the Royal Society of London. Series B: Biological Sciences.

[2]  R. Ricklefs,et al.  ISLAND AND TAXON EFFECTS IN PARASITISM AND RESISTANCE OF LESSER ANTILLEAN BIRDS , 2000 .

[3]  R. Jovani,et al.  Geographical variation in blood parasites in feral pigeons: the role of vectors. , 2000 .

[4]  J. Figuerola.  Effects of salinity on rates of infestation of waterbirds by haematozoa , 1999 .

[5]  J. Donázar,et al.  Habitat, world geographic range, and embryonic development of hosts explain the prevalence of avian hematozoa at small spatial and phylogenetic scales. , 1999, Proceedings of the National Academy of Sciences of the United States of America.

[6]  K. Allander,et al.  Temporal variation and reliability of blood parasite levels in captive Yellowhammer males Emberiza citrinella , 1997 .

[7]  T. Piersma.  Do global patterns of habitat use and migration strategies co-evolve with relative investments in immunocompetence due to spatial variation in parasite pressure? , 1997 .

[8]  A. Barbosa,et al.  Absence of haematozoa in a wild chinstrap penguin Pygoscelis antarctica population , 1997, Polar Biology.

[9]  R. Little,et al.  Sandgrouse (pterocleidae) and sociable weavers Philetarius socius lack avian haematozoa in semi-arid regions of South Africa , 1995 .

[10]  R. Ricklefs,et al.  Embryonic development period and the prevalence of avian blood parasites. , 1992, Proceedings of the National Academy of Sciences of the United States of America.

[11]  R. Montgomerie,et al.  Scarcity of haematozoa in birds breeding on the arctic Tundra of North America , 1992 .

[12]  J. Bates,et al.  Avian hematozoa from west-central Bolivia. , 1991, The Journal of parasitology.

[13]  M. Stoskopf,et al.  PLASMODIUM RELICTUM AS A CAUSE OF AVIAN MALARIA IN WILD-CAUGHT MAGELLANIC PENGUINS (SPHENISCUS MAGELLANICUS) , 1988, Journal of wildlife diseases.

[14]  D. Austin,et al.  Blood protozoa of wild turkeys in Florida. , 1974, The Journal of protozoology.

[15]  J. Figuerola,et al.  Intracolonial differences in the infestation by Haemoproteus lan on Yellow-legged Gulls Larus cachinnans , 1997 .

[16]  G. Bennett,et al.  Ornithodoros peringueyi (Argasidae) and Xenopsylla trispinis (Siphonaptera), probable intermediate hosts of Hepatozoon atticorae of the South African Cliff Swallow, Hirundo spilodera , 1992 .

[17]  V. Apanius.  Avian trypanosomes as models of hemoflagellate evolution. , 1991, Parasitology today.