Genetix hat geschrieben:So, ich habe eine Antwort bekommenAnthouse hat geschrieben:10000-15000 workers no more.
wenn das so ist, dann brauch ich bei meinen aber nicht mehr anbauen.
Genetix hat geschrieben:So, ich habe eine Antwort bekommenAnthouse hat geschrieben:10000-15000 workers no more.
A 2013 study of 55 citrus orchards in eastern Spain (Atanackovic et al., 2015) found: Messor barbarus was the only granivorous species present, with nests found on the field edges and between the tree rows in the field. No nests were observed under the trees, which is most likely related to the lack of insulation. The nests were large in size (quantified by having several nest entrances and a high number of workers), while small colonies were detected in only a few fields. The number of nests was approximated to be zero-to-five nests per field, based on observations from the diagonal transect, as well as between the rows. Seed predation was observed in almost all the fields with M. barbarus. The harvester ants mostly removed Lolium rigidum and Solanum spp. seeds, although in one orchard, Conyza spp. seeds were observed surrounding the nest entrances."
M. barbarus were the main ant species that were observed in the fields, as confirmed by previous studies in this area (MonzĂł et al. 2013). They are present in citrus orchards during most of the year, except in the winter months of November to April (Urbaneja et al. 2006). Messor barbarus never climbs on trees, but forages on the soil surface; therefore, it is a species that does not damage citrus fruits (Platner et al. 2012). In the surveyed fields, ant nests were located both in the field and on the borders. This differed from the drip-irrigated citrus orchards in Valencia, where the ants were settled only along the edge (MonzĂł et al. 2013). CerdĂ et al. (2009) did not find differences in the nest numbers between the margins and the inner part of the citrus orchards.
trailandstreet hat geschrieben:wenn das so ist, dann brauch ich bei meinen aber nicht mehr anbauen.
trailandstreet hat geschrieben:Wenn man aaber davon ausgeht, dass schon alleine aufgrund der in der Haltung eher optimalen Bedingungen, dem Fehlen natĂŒrlicher Feinde und ausreichend Nahrung eine eher ungestörte Entwicklung ermöglicht, mĂŒssten sie da sogar noch gröĂer werden.