The floral morphology of Ambrosina and Arisarum is analysed from a developmental and phylogenetic point of view. In Arisarum, there are atypical organs displaying male and female characteristics. This developmental study shows that the male flowers of Ambrosina are di- or tri-androus. A close phylog...

Adult yellow perch were stocked into experimental ponds designed to test the biological effects of aquatic reclamation alternatives currently being pursued by the oil sands mining industry. Water-quality characteristics of oil sands-influenced water in the experimental ponds included increased salin...

Exposure of Japanese medaka (O. latipes) embryos and adult males to sublethal concentrations of two commonly used fungicides, Acrobat MZ (a.i. are dimethomorph and mancozeb) and Tattoo C (a.i. are propanocarb and chlorothalonil) had varying effects on the development and adult male behaviour. During...

The early stages of inflorescence development in Philodendron fragrantissimum (Hook.) G. Don are examined using scanning electron microscopy. Pistillate flowers are initiated on the lower portion of the inflorescence and staminate flowers are initiated on the distal portion.

5-Hydroxytryptamine (serotonin, 5-HT) increased the release of endogenous adenosine from dorsal, but not ventral, spinal cord synaptosomes. This release was reduced by (i) the 5-HT receptor antagonist methysergide, (ii) removal of Ca2+ from the medium, (iii) inhibition of ecto-5'-nucleotidase a...

Leaf characters, such as angles between major veins, ratios of the length of leaf lobes, of leaf lobes and sinuses, and of petioles and leaf lobes, were measured on leaves of different sizes and compared against leaf blade length (an indirect measure of developmental time) to see if there were diffe...

One freshwater red alga, Batrachospermum hirosei Ratnabapathy et Kumano, is recorded for the first time from the Philippines. It was found to be attached on the submerged stones near the river in Palogtoc Falls, San Roque, Bulusan, Sorsogon Province. In this study, morphological and reproductive str...

The reproductive cycles of the bivalves Ensis macha (Molina, 1782), Tagelus dombeii (Lamarck, 1818), and Mulinia edulis (King, 183 1) were studied at six sites in southern Chile (38-43degreesS) from November 1996 to December 1997. Samples of E. macha came from three subtidal shallow depths; those of...

Cumulative behavioural toxicity was measured in groups of male and female rat pups (n=6/sex) at different stages of postnatal development. Dose-response curves (DRCs) for toxicity produced by domoic acid (DOM) were generated using animals on postnatal days (PND) 0, 5, 14, and 22, using a behavioural...

S. laurentianum, the Gulf of St. Lawrence Aster, is an endemic aster of Prince Edward Island, New Brunswick, and the Magdalene Islands. It is considered by the Committee on the Status of Endangered Wildlife in Canada to be of special concern in Canada and to be critically imperiled in Prince Edward ...

The androgenic potential of a New Zealand pulp and paper mill effluent was measured by applying a combination of in vitro and in vivo bioassays with mosquitofish (Gambusia affinis) and goldfish (Carassius auratus). The in vivo method assessed the rate of gonopodial development (masculinization) and ...

Aim To understand factors that facilitate insular colonization by black flies, we tested six hypotheses related to life-history traits, phylogeny, symbiotes, island area, and distance from source areas. Location Four northern islands, all within 150 km of the North American mainland, were included i...

Long-term studies on the reproductive fitness of fish under controlled exposure conditions are necessary to address some of the controversy surrounding the field-based studies of pulp and paper effluent effects. This study undertook effluent exposures of 2+ age rainbow trout that were approximately ...