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001-es BibID:BIBFORM085214
Első szerző:Horváth Roland (biológus-ökológus)
Cím:The effect of prey availability on spider assemblages on European black pine (Pinus nigra) bark: spatial patterns and guild structure / Roland Horváth, Szabolcs Lengyel, Csaba Szinetár, László Jakab
Dátum:2005
ISSN:0008-4301
Megjegyzések:Both habitat structural complexity and prey availability can influence the density and diversity of spider assemblages. We studied whether prey availability affects spider assemblages living on the bark of European black pine (Pinus nigra Arnold) in six localities in Hungary. We found both positive and negative relationships between spider and prey assemblages in a sample of 1290 spiders and 24 186 potential prey when among-locality variation in spider assemblages was controlled for. Species richness, number of individuals, and diversity of spiders increased with either the number of prey taxa or the number of prey individuals in a forest in western Hungary. Spider species richness and number of individuals increased with prey diversity but decreased with number of prey taxa in moderately air-polluted urban localities. There was a negative relationship between number of spider individuals and number of prey individuals in a heavily polluted urban locality. Numbers of nocturnal hunters but not diurnal hunters or web-builders increased with the number of their respective prey in the forest in western Hungary and in the moderately air-polluted urban localities. The number of exclusive bark-dwelling spiders increased with the number of prey individuals in forests in eastern Hungary and decreased with the number of prey individuals in the polluted urban locality. We suggest that patterns of spider assemblages can be influenced by prey availability and that other factors (e.g., habitat structural diversity and air pollution) also need to be considered in explaining these patterns
La complexité de la structure de l'habitat et la disponibilité des proies peuvent toutes deux influencer la densité et la diversité des peuplements d'araignées. Nous avons examiné comment la disponibilité des proies affecte les peuplements d'araignées vivant sur l'écorce du pin noir (Pinus nigra Arnold) ℓa six sites de Hongrie. Il existe des relations positives et négatives entre les peuplements d'araignées et de proies dans un échantillon de 1290 araignées et de 24 186 proies potentielles, une fois que l'on tient compte de la variation des peuplements d'araignées entre les sites. Dans une for©et de l'ouest de la Hongrie, la richesse en espℓeces, le nombre d'individus et la diversité des araignées augmentent en fonction ou du nombre de taxons de proies ou du nombre de proies individuelles. Dans les sites urbains ℓa pollution atmosphérique modérée, la richesse en espℓeces et le nombre d'individus augmentent chez les araignées en fonction de la diversité des proies, mais diminuent en fonction du nombre de taxons de proies. Il existe une relation négative entre le nombre d'individus et le nombre de proies individuelles dans le site urbain fortement pollué. Les araignées chasseresses nocturnes, mais non les chasseresses diurnes, ni les constructrices de toiles, augmentent leur densité en fonction de leurs proies respectives dans la for©et de l'ouest de la Hongrie et dans les sites ℓa pollution atmosphérique modérée. Le nombre d'araignées qui vivent exclusivement sur les écorces augmente en fonction du nombre de proies individuelles dans les for©ets de l'est de la Hongrie et décro©it en fonction du nombre de proies individuelles dans le site urbain pollué. Nous croyons que la structure des peuplements d'araignées peut ©etre influencée par la disponibilité des proies, mais qu'il faut aussi tenir compte d'autres facteurs explicatifs, tels que la diversité structurale de l'habitat et la pollution atmosphérique.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Megjelenés:Canadian Journal of Zoology. - 83 : 2 (2005), p. 324-335. -
További szerzők:Lengyel Szabolcs (1971-) (biológus) Szinetár Csaba Jakab László
Pályázati támogatás:F30403
OTKA
Internet cím:Szerző által megadott URL
DOI
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2.

001-es BibID:BIBFORM022625
Első szerző:Pap Péter László (ökológus)
Cím:Host-symbiont relationship and abundance of feather mites in relation to age and body condition of the barn swallow (Hirundo rustica) : an experimental study / Péter László Pap, Jácint Tökölyi, Tibor Szép
Dátum:2005
Megjegyzések:We analyzed the host-symbiont relationship and factors determining the abundance of feather mites among individual barn swallows (Hirundo rustica L., 1758) in two different host populations during the breeding season and postbreeding period. By experimentally removing the feather mites from the flight feathers of the birds with an insecticide, we showed that these symbiotic organisms have neither harmful nor beneficial effects on the fitness of the host, supporting the view that mites are commensals. This was indicated by the lack of any difference in the change in wing-feather length, tail-feather length, fluctuating asymmetry in tail-feather length, breeding performance, and survival of the birds between the fumigated and control groups 1 year after the experiment. During the postbreeding period juveniles harbored fewer mites than adults and the difference was also significant between the 1-year-old birds and those over 1 year old in the breeding population. The number of mites did not change after the second year of life of the birds. We hypothesize that the difference in abundance of mites between the age classes can be explained by the low reproductive potential of the mites, which are not able to populate the exploitable space until the second year of life of the host. Alternatively, young birds might provide fewer resources than old birds. The significant negative association between the number of mites and the laying date of female barn swallows seems to support the conclusion that the abundance of mites is condition-dependent. Because there was no relationship between other condition indices for males and females and number of mites, further research is needed to confirm this conclusion.
Tárgyszavak:Természettudományok Biológiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:Canadian Journal of Zoology. - 83 : 8 (2005), p. 1059-1066. -
További szerzők:Tökölyi Jácint (1984-) (biológus) Szép Tibor
Internet cím:Intézményi repozitóriumban (DEA) tárolt változat
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3.

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
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