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Titolo:
NO INTERSPECIFIC COVARIATION IN INTENSITIES OF MACROPARASITES OF REINDEER, RANGIFER TARANDUS (L.)
Autore:
NILSSEN AC; HAUGERUD RE; FOLSTAD I;
Indirizzi:
UNIV TROMSO,TROMSO MUSEUM,DEPT ZOOL N-9037 TROMSO NORWAY DEPT ARCTIC VET MED,NOR N-9005 TROMSO NORWAY UNIV TROMSO,INST BIOL N-9037 TROMSO NORWAY
Titolo Testata:
Parasitology
, volume: 117, anno: 1998,
parte:, 3
pagine: 273 - 281
SICI:
0031-1820(1998)117:<273:NICIIO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
HELIGMOSOMOIDES-POLYGYRUS NEMATODA; CEPHENEMYIA-TROMPE; HYPODERMA-TARANDI; AGGREGATION; POPULATIONS; OESTRIDAE; PARASITES; INFECTION; DIPTERA; FLY;
Keywords:
CEPHENEMYIA TROMPE; HYPODERMA (= OEDEMAGENA) TARANDI; LINGUATULA ARCTICA; ELAPHOSTRONGYLUS RANGIFERI; RANGIFER TARANDUS; INTERSPECIFIC COVARIATION; MULTIPLE-SPECIES INFECTIONS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
A.C. Nilssen et al., "NO INTERSPECIFIC COVARIATION IN INTENSITIES OF MACROPARASITES OF REINDEER, RANGIFER TARANDUS (L.)", Parasitology, 117, 1998, pp. 273-281

Abstract

The macroparasites Cephenemyia trompe (Modeer) and Hypoderma (= Oedemagena) tarandi (L. ) (Diptera: Oestridae), Linguatula arctica Riley, Haugerud and Nilssen (Pentastomida: Linguatulidae), Elaphostrongylus rangiferi Mitskevich (Nematoda: Protostrongylidae), and abomasal nematodes (Nematoda: Trichostrongylidae) were sampled in semidomestic reindeercalves (Rangifer tarandus (L. )) (ca. 8 months of age) in northern Norway in 1988 (n = 160) and 1989 (n = 191). Each parasite showed an aggregated (clumped) distribution among the hosts and fitted the negative binomial distribution. Analyses of interspecific associations in intensities showed that there was no consistent covariation among the parasites apart from a weak correlation (Kendall's tau 0.104, P = 0.007) between the 2 oestrids C. trompe and H. tarandi. This lack of covariation reveals that the parasites were distributed independently of each other, and suggests that innate host resistance is not a dominant factorthat has a significant simultaneous effect on all parasites. The aggregated distribution of each parasite species is hypothesized to be caused by (1) random events and heterogeneities in host behaviour that create unequal transmission (exposure) rates, or (2) by heterogeneities in parasite specific immunocompetence among host individuals. Factors in hypothesis (1) are probably the most important at low transmission rates.

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Documento generato il 27/11/20 alle ore 22:03:30