Otto von Helversen
Otto von Helversen; Helversen; O. von Helversen; O. v. Helversen
* August 09, 1943 – March 02, 2009 †
chiropterologist, university teacher, zoologist, zoological collector
German zoologist and university teacher (1943-2009)
Science Enabled by Specimen Data
Li, X., B. Li, G. Wang, X. Zhan, and M. Holyoak. 2020. Deeply digging the interaction effect in multiple linear regressions using a fractional-power interaction term. MethodsX 7: 101067. https://doi.org/10.1016/j.mex.2020.101067
In multiple regression Y ~ β0 + β1X1 + β2X2 + β3X1 X2 + ɛ., the interaction term is quantified as the product of X1 and X2. We developed fractional-power interaction regression (FPIR), using βX1M X2N as the interaction term. The rationale of FPIR is that the slopes of Y-X1 regression along the X2 gr…
Piel, W. H. 2018. The global latitudinal diversity gradient pattern in spiders. Journal of Biogeography 45: 1896–1904. https://doi.org/10.1111/jbi.13387
Aim: The aim of this study was to test the hypothesis that the global latitudinal diversity gradient pattern in spiders is pear‐shaped, with maximum species diversity shifted south of the Equator, rather than egg‐shaped, centred on the equator, this study infers the gradient using two large datasets…
Uludag, A., N. Aksoy, A. Yazlık, Z. F. Arslan, E. Yazmış, I. Uremis, T. A. Cossu, et al. 2017. Alien flora of Turkey: checklist, taxonomic composition and ecological attributes. NeoBiota 35: 61–85. https://doi.org/10.3897/neobiota.35.12460
The paper provides an updated checklist of the alien flora of Turkey with information on its structure. The alien flora of Turkey comprises 340 taxa, among which there are 321 angiosperms, 17 gymnosperms and two ferns. Of the total number of taxa, 228 (68%) are naturalized and 112 (32%) are casual. …