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001-es BibID:BIBFORM013484
Első szerző:Pap Péter László (ökológus)
Cím:Sexual dimorphism in immune function changes during the annual cycle in house sparrows / Péter László Pap, Gábor Árpád Czirják, Csongor István Vágási, Zoltán Barta, Dennis Hasselquist
Dátum:2010
ISSN:0028-1042
Megjegyzések:Difference between sexes in parasitism is a common phenomenon among birds, which may be related to differences between males and females in their investment into immune functions or as a consequence of differential exposure to parasites. Because life-history strategies change sex specifically during the annual cycle, immunological responses of the host aiming to reduce the impact of parasites may be sexually dimorphic. Despite the great complexity of the immune system, studies on immunoecology generally characterise the immune status through a few variables, often overlooking potentially important seasonal and gender effects. However, because of the differences in physiological and defence mechanisms among different arms of the immune system, we expect divergent responses of immune components to environmental seasonality. In male and female house sparrows (Passer domesticus), we measured the major components of the immune system (innate, acquired, cellular and humoral) during four important life-history stages across the year: (1) mating, (2) breeding, (3) moulting and (4) during the winter capture and also following introduction to captivity in aviary. Different individuals were sampled from the same population during the four life cycle stages. We found that three out of eight immune variables showed a significant life cycle stage x sex interaction. The difference in immune response between the sexes was significant in five immune variables during the mating stage, when females had consistently stronger immune function than males, while variables varied generally non-significantly with sex during the remaining three life cycle stages. Our results show that the immune system is highly variable between life cycle stages and sexes, highlighting the potential fine tuning of the immune system to specific physiological states and environmental conditions.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Acquired immunity
Annual cycle of immune responses
Cellular immunity
Humoral and innate immunity
Passer domesticus
Sex-differential immunity
Megjelenés:Naturwissenschaften. - 97 : 10 (2010), p. 891-901. -
További szerzők:Czirják Gábor Árpád Vágási Csongor István Barta Zoltán (1967-) (biológus, zoológus) Hasselquist, Dennis
Internet cím:DOI
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001-es BibID:BIBFORM074569
Első szerző:Rádai Zoltán (biológus)
Cím:Sex-dependent immune response in a semelparous spider / Rádai Zoltán, Németh Zoltán, Barta Zoltán
Dátum:2018
Megjegyzések:Previous studies on arthropods showed that seasonality and parity in breeding considerably impact the direction of sex differences in immunocompetence, and it has been suggested that life span and the time window available for breeding play key roles in shaping sex-differences in immunity. One proposed mechanism behind this phenomenon is differential investment into life history traits in sexes. Here, we tested whether in a seasonally breeding semelparous arthropod sexes differ in their immunocompetence, predicting that females would show weaker immune response than males. We compared encapsulation efficiency (a well-established and widely used method for assessing immunocompetence) of freshly matured, virgin males and females of the lycosid spider Pardosa agrestis (Westring, 1861). On average, males mounted stronger immune response than females and the extent of encapsulation was positively associated with prosoma length in males, but not in females. Also, time until maturation was positively related to the extent of encapsulation in both sexes, but did not significantly affect adult prosoma length. We propose that sex-difference in encapsulation is likely shaped by combined effects of relatively higher costs of reproduction in females, narrow time window of reproductive activity, and the absence of trade-off between current and future reproduction.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Sex-bias
Immunity
Reproductive strategy
Semelparity
Megjelenés:Naturwissenschaften. - 105 : 7-8 (2018), p. 39. -
További szerzők:Németh Zoltán (1976-) (biológus) Barta Zoltán (1967-) (biológus, zoológus)
Internet cím:Szerző által megadott URL
DOI
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