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Sources of variability in aggregation and sex ratios of Crataerina melbae (Diptera: Hippoboscidae) among adult colonial alpine swifts.
J Parasitol. 2000 Oct; 86(5):933-8.JP

Abstract

Aggregation of Crataerina melbae flies on breeding adult alpine swifts (Apus melba) was low when compared with other host-parasite systems and varied with sampling date, year, and sex of the flies. Generalized linear models were performed to ascertain which factors, extrinsic and/or intrinsic to the host, explained variability in the number of louse flies present on a single host, i.e., abundance. Overall abundance was unrelated to any host characteristic but varied slightly among years. Abundance of female flies varied among years, but also with date of sampling, the number of females increasing as the breeding season advanced. In contrast, abundance of males decreased as the season progressed, independently of host characteristics. Despite these different patterns, the number of flies of each sex on a given host was strongly intercorrelated. These results suggest that mate attraction may explain aggregation patterns in this louse fly species. Overall sex ratio of louse flies did not differ from unity. However, the proportion of males decreased during the breeding season, as a consequence of the opposite sex-related seasonal patterns in parasite abundance. Sex-ratio variability was not related to host characteristics or to infrapopulation sizes.

Authors+Show Affiliations

Department of Applied Biology, Estación Biológica de Doñana, CSIC, Sevilla, Spain.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

11128513

Citation

Tella, J L., and R Jovani. "Sources of Variability in Aggregation and Sex Ratios of Crataerina Melbae (Diptera: Hippoboscidae) Among Adult Colonial Alpine Swifts." The Journal of Parasitology, vol. 86, no. 5, 2000, pp. 933-8.
Tella JL, Jovani R. Sources of variability in aggregation and sex ratios of Crataerina melbae (Diptera: Hippoboscidae) among adult colonial alpine swifts. J Parasitol. 2000;86(5):933-8.
Tella, J. L., & Jovani, R. (2000). Sources of variability in aggregation and sex ratios of Crataerina melbae (Diptera: Hippoboscidae) among adult colonial alpine swifts. The Journal of Parasitology, 86(5), 933-8.
Tella JL, Jovani R. Sources of Variability in Aggregation and Sex Ratios of Crataerina Melbae (Diptera: Hippoboscidae) Among Adult Colonial Alpine Swifts. J Parasitol. 2000;86(5):933-8. PubMed PMID: 11128513.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sources of variability in aggregation and sex ratios of Crataerina melbae (Diptera: Hippoboscidae) among adult colonial alpine swifts. AU - Tella,J L, AU - Jovani,R, PY - 2000/12/29/pubmed PY - 2001/2/28/medline PY - 2000/12/29/entrez SP - 933 EP - 8 JF - The Journal of parasitology JO - J. Parasitol. VL - 86 IS - 5 N2 - Aggregation of Crataerina melbae flies on breeding adult alpine swifts (Apus melba) was low when compared with other host-parasite systems and varied with sampling date, year, and sex of the flies. Generalized linear models were performed to ascertain which factors, extrinsic and/or intrinsic to the host, explained variability in the number of louse flies present on a single host, i.e., abundance. Overall abundance was unrelated to any host characteristic but varied slightly among years. Abundance of female flies varied among years, but also with date of sampling, the number of females increasing as the breeding season advanced. In contrast, abundance of males decreased as the season progressed, independently of host characteristics. Despite these different patterns, the number of flies of each sex on a given host was strongly intercorrelated. These results suggest that mate attraction may explain aggregation patterns in this louse fly species. Overall sex ratio of louse flies did not differ from unity. However, the proportion of males decreased during the breeding season, as a consequence of the opposite sex-related seasonal patterns in parasite abundance. Sex-ratio variability was not related to host characteristics or to infrapopulation sizes. SN - 0022-3395 UR - https://www.unboundmedicine.com/medline/citation/11128513/Sources_of_variability_in_aggregation_and_sex_ratios_of_Crataerina_melbae__Diptera:_Hippoboscidae__among_adult_colonial_alpine_swifts_ L2 - http://www.journalofparasitology.org/doi/10.1645/0022-3395(2000)086[0933:SOVIAA]2.0.CO;2?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -