@misc{Ulrich_Werner_Ecological_2001,
 author={Ulrich, Werner},
 editor={Polish Academy of Sciences. Institute of Ecology},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Dziekanów Leśny},
 howpublished={online},
 year={2001},
 language={eng},
 abstract={Ecological characteristics of relatively rare (singleton) hymenopteran species sampled in a beech forest on limestone are studied. No marked differences between singleton and non-singleton species occurred in regard to guild membership, stratum of host attack and phenology. There was however a strong effect of sample size on the fraction of singletons. Body size and phylogenetic position also appeared to influence rarity, but it proofed to be difficult to separate the effects of both variables. Rare species appeared to have larger density fluctuations but - in line with the theory of local mate competition - lower sex ratios than more common species. Brachypterous and apterous species had lower fractions of singletons. This result contradicts theoretical expectations of metapopulation models.},
 type={Text},
 title={Ecological characteristics of rare species: the case of parasitic Hymenoptera},
 URL={http://rcin.org.pl/Content/115851/PDF/WA058_91441_P2840-T49_Eko-Pol-A-Nr-4.pdf},
 volume={49},
 number={4},
 journal={Polish Journal of Ecology},
 publisher={Polish Academy of Sciences. Institute of Ecology. Publishing Office},
 keywords={Hymenoptera, parasitoids, rarity, density fluctuations, beech forest, phylogeny},
}