Parasitological examination of faeces of 26 snakes kept in Bio-Ken Snake Farm, Watamu, Kenya revealed new species of Eimeria Schneider, 1875 in Telescopus semiannulatus Smith, 1849. Oocysts of Eimeria arabukosokokensis sp. n. are cylindrical 26.8 (25-29) × 15.1 (14-16) µm with smooth, bilayered oocyst wall and a single polar granule. The broadly ellipsoidal sporocysts average 9.3 (8.5-10) × 7.1 (6.5-7.5) µm and possess single-layered wall composed of two plates joined by longitudinal suture. Caryospora cf. regentensis Daszak et Ball, 2001 is reported from Dendroaspis angusticeps (Smith, 1849) and two additional forms of Caryospora Léger, 1904 are reported and morphologically characterised from a single specimen of Psammophis orientalis Broadley, 1977. Systematic status of Caryospora spp. in sub-Saharan Psammophis Boie, 1827 is discusses and all species reported by various authors to date are suggested to be treated as species inquirendae until more detailed data on these parasites and their hosts are available.
The effect of enhanced air CO2 concentrations (C520 and 0^50 = 520 and 650 cm^ m"^) on the growth of Lamium galeobdolon and Stellaria holostea and on the competition between the two species was examined. After five months growth imder CO2 enrichment the dry masses of both species increased when the plants were grown in monoculture, but the increase in biomass was much more pronounced in Stellaria. When the plants were grown together in competition, the measured shoot masses of Stellaria were again higher under C520 and 0^50 than at ambient CO2 concentration (C390 = 390 cm^ m'^), while the shoot masses of Lamium strongly decreased at Cgso- The effect of CO2 enrichment on the two plant species in monoculture differed significantly from that observed in mixed cultures. In terms of plant relative yield, Stellaria benefitted slightly but insignificantly from competition, while Lamium was significantly suppressed imder c^sq. Total community production of the mixed culture was optimum at C520, while that of the monocultures was highest at c^sq. At C390 and C520, growth of Stellaria depended strongly on irradiance in all types of culture. At C650 no such dependence could be demonstrated.