Naslov
Prevalence of Cacoxenus indagator larvas in Osmia spp. artificial nests setteld in Croatia

Autori
Tlak Gajger, Ivana ; Jurković, Mirko ; Koščević, Anja ; Laklija, Ivana ; Ševar, Marija

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
ApiEcoFlora and Biodiversity / Biesmeijer, J. C. - Rim : University Tor Vergata, 2014, 73-73

Skup
ApiEcoFlora and Biodiversity International Symposium

Mjesto i datum
Rim, Italija, 06.11.2014. - 07.11.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
pollination; solitary bees; Cacoxenus indagator; Croatia

Sažetak
Almost three-quarters of all food crops depend at least partly on pollination by insects. This pollination is essential for the reproductive success of many plants. Loss and isolation of natural habitats in agricultural landscapes can cause declines of plants and pollinators and endanger pollination services. Also, the decline of honeybee colonies due to diseases and pesticides has prompted serious concern. Given this importance, widespread declines in pollinator diversity have led to concern about a global “pollination problem”. Solitary bees Osmia spp. are significant supplementary factor for effective crop pollination in favourable environmental conditions. Controlled farms with artificial nests of solitary bees are invaded by various parasites and other accompanying fauna. The aim of this study was to find out prevalence of Cacoxenus indagator larvas in Osmia spp. artificial nests settled in four locations in continental part of Croatia. These locations are situated in different biotopes and are influenced by different environmental factors such as geographical, climatic and pasture conditions. The number of brood chambers with adult bees was determinated, as well as the number of parasite invaded chambers and foreign fauna. Sampled nests from which cocoons were collected originated from the different breeders and complete nests were transported in laboratory where the total nest contents of random samples were examined in November 2013. Nests were made of common reed (Phragmites australis) with different length of tubes and one- or two-year old cane tubes. In total the 208 cane tubes with 1501 cocoons were sectioned and examined. According to origin locations: ZG – 47/307 ; OS – 13/147 ; NG – 128/944 ; and OZ – 20/103 (cane tubes/cocoons). The number of cocoons invaded with Cacoxenus indagator larvae was 8.14% ; 0% ; 1.48% ; and 8.74% respectively. The cocoons with unidentified causes of damage were found as follows: 0% ; 28.57% ; 3.07% ; and 11.65%, respectively. In the two-years old nest material there was no tube containing just healthy cocoons, and tubes invaded with Cacoxenus indagator (or other parasites and accompanying fauna) or with damages of unidentified cause was significantly more in comparison with one-year old slots. Namely, the presence of nest parasites limits the number of solitary bees that can emergence from cocoons and have negative influence on their individual development. Therefore, in rearing of solitary bees it is necessity to use just annual nesting material, and destroying this used year before, as measure of diseases prevention.

Izvorni jezik
Engleski

Znanstvena područja
Veterinarska medicina

POVEZANOST RADA