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001-es BibID:	BIBFORM030382
Első szerző:	Pap Péter László (ökológus)
Cím:	The Effect of Coccidians on The Condition and Immune profile of Molting House Sparrows (Passer domesticus) / Péter László Pap, Csongor István Vágási, Gábor Árpád Czirják, Adriana Titilincu, Adela Pintea, Gergely Osváth, Attila Fülöp, Zoltán Barta
Dátum:	2011
ISSN:	0004-8038
Megjegyzések:	Feather molt is recognized as an energetically costly activity for birds, and parasite infestation during molt has the potential to reduce host fitness because parasites sequester essential nutrients and stimulate the immune system. We manipulated the coccidian parasite load of captive male House Sparrows (Passer domesticus) by suppressing the natural infection of control birds with an anticoccidial drug and infecting experimental birds with coccidian oocysts. Following infestation, the effect of chronic coccidian infection on individual condition, molt and 12 indices of physiological and immunological function was assessed. We found a significant positive relationship between infestation and heterophil/lymphocyte ratio measured at capture, indicating infectioninduced stress. We also found that coccidians negatively affected feather growth during molt: the increase in wing length of the noninfected birds was significantly higher than that of infected birds. In comparison to control birds, infected birds showed a significantly higher concentration of white blood cells and greater blood bactericidal activity. There was also a positive correlation between infection intensity, agglutination and lysis of blood in the experimentally infested birds, which indicated activation of the constitutive innate immune system during infection. Finally, the total antioxidant capacity of the blood increased significantly, while the carotenoid concentration decreased significantly in infected compared with control birds. Therefore, we showed that coccidians stimulated several measures of the constitutive innate immunity, including the bactericidal activity of the blood, and that coccidians can have significant negative effects on the health and possibly fitness of molting House Sparrows
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban aviary bacteria killing capacity complement experimental infection feather quality immune response, Isospora natural antibodies
Megjelenés:	The auk. - 128 : 2 (2011), p. 330-339. -
További szerzők:	Vágási Csongor István Czirják Gábor Árpád Titilincu, Adriana Pintea, Adela Osváth Gergely (1985-) (biológus) Fülöp Attila (1987-) (biológus) Barta Zoltán (1967-) (biológus, zoológus)
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001-es BibID:	BIBFORM018992
Első szerző:	Pap Péter László (ökológus)
Cím:	Diet quality affects postnuptial molting and feather quality of the house sparrow (Passer domesticus) : interaction with humoral immune function? / Péter László Pap, Csongor István Vágási, Gábor Árpád Czirják, Zoltán Barta
Dátum:	2008
ISSN:	0008-4301
Megjegyzések:	We investigated the effects of nutritional limitation, humoral immune activation, and their interaction on postnuptial molting of aviary-kept house sparrows (Passer domesticus (L., 1758. In a 2*2 experimental design, we measured the progress of molting and the quality of feathers produced during molting by house sparrow exposed to different diet qualities (high and low9 and humoral immune activation with sheep red blood cells (SRBC). Food quality, but not the activation of humoral immunity, affected significantly the body mass and the process of molting.Sparrows feeding on low-quality food had decreased body mass and longer molts than the high-quality group.Low-quality food, but not the activation of humoral immunity, reduced significantly the length and mass (i.e.,the quality) of primaries grown during molting. birds responded significantly to injection with SRBC compared with the control group, but the immune response was similar between nutritional groups. The absence of a negative effect of humoral immunity on molting in house sparrows might be related to the low energy and nutritional requirements of mounting and maintaining a humoral immune response.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Canadian Journal of Zoology. - 86 : 8 (2008), p. 834-842. -
További szerzők:	Vágási Csongor István Czirják Gábor Árpád Barta Zoltán (1967-) (biológus, zoológus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM018775
Első szerző:	Pap Péter László (ökológus)
Cím:	Carotenoids modulate the effect of coccidian infection on the condition and immune response in moulting house sparrows / Péter László Pap, Csongor István Vágási, Gábor Árpád Czirják, Adriana Titilincu, Adela Pintea, Zoltán Barta
Dátum:	2009
Megjegyzések:	In the present study, we experimentally manipulated coccidian parasitism and dietary carotenoid availability in a fully factorial experiment in male house sparrows (Passer domesticus Linnaeus), and tested whether carotenoid supplementation reduces the cost of parasitism in terms of condition, moult and immune responses. We found that coccidians have a significant but transient negative effect on body mass, which can be reduced if birds have access to carotenoid supplementation in their diet. Experimental manipulation had no significant effect on the moulting parameters of the birds measured following coccidian infestation and during the whole moulting period. Carotenoid supplementation increased the plasma carotenoid concentration in both infested and medicated birds treated with a coccidiostatic drug; however, after two months exposure to parasites, plasma carotenoid concentration increased only in the carotenoid-supplemented and medicated group whereas no difference was observed between the carotenoid-supplemented and infested and non-supplemented groups. On the contrary, coccidian infestation was not affected by carotenoid supplementation. Experimental infestation decreased the antibody response to sheep red blood cells (SRBCs), although no significant effect was observed in the capacity of the birds to respond to a mitogenic challenge with phytohemagglutinin. Within the experimentally infested groups birds with carotenoid-supplemented food tended to have an increased anti-SRBC humoral immune response. The positive correlation between coccidian infestation and the strength of the humoral immune response against SRBCs in the non-supplemented and infested groups indicates that this part of the immune system plays an important role in defence against these parasites.
Tárgyszavak:	Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban aviary, carotenoid supplementation, experimental infection, humoral immune response, Isospora, Passer domesticus.
Megjelenés:	Journal of Experimental Biology. - 212 (2009), p. 3228-3235. -
További szerzők:	Vágási Csongor István Czirják Gábor Árpád Titilincu, Adriana Pintea, Adela Barta Zoltán (1967-) (biológus, zoológus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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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 Intézményi repozitóriumban (DEA) tárolt változat
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