Latitudinal, longitudinal and weather-related variation in breeding parameters of Great Reed Warblers in Europe: A meta-analysis

<div><p><b>Capsule</b> Clutch initiation date decreased with longitude, clutch size increased with latitude and decreased with maximum temperature, whereas the number of fledglings increased both with latitude and longitude, and decreased with maximum temperature in 19 European studies of the Great Reed Warbler. Our study confirmed previous findings about the increasing trend in clutch size with latitude, but also found earlier clutch initiation dates and higher number of fledglings longitudinally from west to east, with precipitation closely associated with clutch initiation date and maximum temperature closely associated with the number of fledglings.</p></div

Gniježđenje kukavice (Cuculus canorus), nametnika u gnijezdima, u trščanim staništima SZ Vojvodine, Srbija

We monitored the breeding success of the Common Cuckoo (Cuculus canorus) in four reed habitats (e.g. clay pits, marsh and fishponds, small canals and large canals) in northwestern Vojvodina (Serbia) between 2009 and 2011 (three breeding seasons). A total of 596 Great Reed Warbler (Acrocephalus arundinaceus) nests were found and monitored. The overall parasitism rate for the study area was 0.127, which was calculated from the number of parasitized nests (76) divided by the total number of Great Reed Warbler nests (596). The parasitism rate did not vary with the total number of Great Reed Warbler nests at a study site. The number of parasitized and successful parasitized nests showed significant negative relationship, which means more parasitized nests resulted with more brood lost. The parasitism rate varied significantly among habitats but not among years while the number of successfully parasitized nests differed among both habitats and years. Parasitized nests found in small and large canals showed the highest reproductive success of Cuckoos. Loss of parasitized nests through predation and bad weather circumstances was relatively high in this study compared to other areas.Od 2009. do 2011. godine (tri gnijezdeće sezone) provedeno je istraživanje o uspješnosti gniježđenja obične kukavice (Cuculus canorus) na četiri različita trščana staništa (iskopine, močvare i ribnjaci, mali i veliki kanali) u sjeverozapadnoj Vojvodini (Srbija). Parazitiranje kukavice praćeno je u 596 gnijezda velikog trstenjaka (Acrocephalus arundinaceus). Stopa kukavičjeg parazitiranja za cijelo istraživano područje iznosila je 0.127, a izračunata je tako što je broj parazitiranih gnijezda (76) podijeljen s ukupnim brojem nađenih gnijezda velikog trstenjaka (596). Pojedinačno po istraživanim lokacijama broj parazitiranih gnijezda nije varirao zajedno s ukupnim brojem gnijezda velikog trstenjaka. Broj parazitiranih gnijezda je bio u negativnoj korelaciji s brojem uspješnih parazitiranih gnijezda, tj. što veći je broj parazitiranih gnijezda, više je propalih. Stopa parazitiranja varirala je značajno između staništa, ali ne između godina, dok je broj uspješno parazitiranih gnijezda značajno varirao između staništa i godina. Parazitirana gnijezda nađena na malim i velikim kanalima su rezultirala s najvišom reproduktivnom uspješnosti kukavice. Broj propalih gnijezda zbog predacije i loših vremenskih prilika u ovom je radu, u usporedbi s rezultatima drugih izvora, relativno visok

Negative effect of roosting starlings (Sturnus vulgaris) on clutch survival in the great reed warbler (Acrocephalus arundinaceus)

This study provides preliminary findings related to whether and how the roosting of starlings (Sturnus vulgaris) in reedbeds influences the survival of clutches of the great reed warbler (Acrocephalus arundinaceus). During the nesting seasons of 2014 and 2015, we surveyed the complete area of a mining pond in Serbia (south-eastern Europe) for great reed warbler nests, and the presence of roosting starlings was also recorded. Using the Mayfield method, we estimated the daily survival rate of great reed warbler eggs and nestlings, and compared these rates between starling roosting and non-roosting areas. Although both egg and nestling survival rates were lower in the Starling roosting than in the non-roosting areas, the differences were not significant, which was also reflected in overall nesting success. However, when only data from the time period when starling roosting occurred, the overall great reed warbler egg survival was significantly lower in roosting areas than in non- roosting areas. Our results suggest that Starling roosting did not influence the clutch survival of the great reed warbler significantly, but that there can be a negative short-term or local effect. Our study implies that a larger number of starlings and a longer roosting period could affect clutch survival more negatively

Gniježđenje kukavice (Cuculus canorus), nametnika u gnijezdima, u trščanim staništima SZ Vojvodine, Srbija

We monitored the breeding success of the Common Cuckoo (Cuculus canorus) in four reed habitats (e.g. clay pits, marsh and fishponds, small canals and large canals) in northwestern Vojvodina (Serbia) between 2009 and 2011 (three breeding seasons). A total of 596 Great Reed Warbler (Acrocephalus arundinaceus) nests were found and monitored. The overall parasitism rate for the study area was 0.127, which was calculated from the number of parasitized nests (76) divided by the total number of Great Reed Warbler nests (596). The parasitism rate did not vary with the total number of Great Reed Warbler nests at a study site. The number of parasitized and successful parasitized nests showed significant negative relationship, which means more parasitized nests resulted with more brood lost. The parasitism rate varied significantly among habitats but not among years while the number of successfully parasitized nests differed among both habitats and years. Parasitized nests found in small and large canals showed the highest reproductive success of Cuckoos. Loss of parasitized nests through predation and bad weather circumstances was relatively high in this study compared to other areas.Od 2009. do 2011. godine (tri gnijezdeće sezone) provedeno je istraživanje o uspješnosti gniježđenja obične kukavice (Cuculus canorus) na četiri različita trščana staništa (iskopine, močvare i ribnjaci, mali i veliki kanali) u sjeverozapadnoj Vojvodini (Srbija). Parazitiranje kukavice praćeno je u 596 gnijezda velikog trstenjaka (Acrocephalus arundinaceus). Stopa kukavičjeg parazitiranja za cijelo istraživano područje iznosila je 0.127, a izračunata je tako što je broj parazitiranih gnijezda (76) podijeljen s ukupnim brojem nađenih gnijezda velikog trstenjaka (596). Pojedinačno po istraživanim lokacijama broj parazitiranih gnijezda nije varirao zajedno s ukupnim brojem gnijezda velikog trstenjaka. Broj parazitiranih gnijezda je bio u negativnoj korelaciji s brojem uspješnih parazitiranih gnijezda, tj. što veći je broj parazitiranih gnijezda, više je propalih. Stopa parazitiranja varirala je značajno između staništa, ali ne između godina, dok je broj uspješno parazitiranih gnijezda značajno varirao između staništa i godina. Parazitirana gnijezda nađena na malim i velikim kanalima su rezultirala s najvišom reproduktivnom uspješnosti kukavice. Broj propalih gnijezda zbog predacije i loših vremenskih prilika u ovom je radu, u usporedbi s rezultatima drugih izvora, relativno visok