The full course of new parasite introductions in wild animals is difficult to accurately trace. We documented and analysed the invasive blood-sucking nematode Ashworthius sidemi (Trichostrongylidae) introduction and spread in European bison (Bison bonasus) from the initial phase of its progression. In the Polish part of the Białowieża Primeval Forest (BPF) the parasite was first found in 2000. ...

In 1995, wolves Canis lupus were reintroduced into Yellowstone National Park, USA, where they began to prey on ungulate species. In response to this new predation risk by wolves, we predicted that the two main ungulate species, elk Cervus elaphus and bison Bison bison, should compensate by reducing their use of riskier open meadows and increasing their use of safer forest. Additionally we predi...

EDITORIAL 199 RANDOM SAMPLES 222 Ahead of Schedule and On Budget BI 0 ~~~~~~~~~~~BOOK REVIEWS :307 LETTERS 201 Science Has No Naional Borders, reviewed by M. F. DNA Fingerprinting: D. L. Hartl and R. C. Low * No Man's Land, M. R. Fowlkes * Bison, J. H. Lewontin; W. S. Lovell; D. E. Koshland Jr. * "RealShaw * Tracing the History of Eukaryotic Cells,0C. W. World Experience" in Chemistry: L. A. Me...

A serological study of twenty three European bison (Bison bonasus) derived from Northern-East Poland for the seroprevalence of Mycobacterium avium subsp. paratuberculosis, Mycoplasma bovis, Mycoplasma mycoides subsp. mycoides SC, Mycoplasma agalactiae and Mycoplasma capricolum subsp. capripneumoniae was conducted. Only specific antibodies to M. bovis were detected in two animals (8.7%) which we...