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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 ...
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BACKGROUND AND PURPOSE: Postsynaptic density-95 inhibitors reduce ischemic brain damage without inhibiting excitatory neurotransmission, circumventing the negative consequences of glutamatergic inhibition. However, their efficacy in permanent ischemia and in providing permanent neuroprotection and n...
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Distribution of caudal papillae in adult Romanomermis culicivorax was determined by scanning electron microscopy. Ninety-eight caudal papillae, each containing one pore, were present in males but absent in females. Papillae were arranged in 3 longitudinal rows, one ventral and 2 ventrolateral; the m...
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A species is expected to occur where the prevailing biotic and abiotic conditions fall within its fundamental niche. Geographic range limits should, therefore, occur when the survival and fitness of individuals along ecological gradients is reduced to the point at which populations are no longer sel...
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We cultured and sequenced newly collected material of Percursaria dawsonii Hollenberg et I. A. Abbott, a poorly known epibiont of limpets found along the west coast of North America. Zoospores, parthenogametes, and zygotes exhibited empty-spore germination, which produced a prostrate system that exp...
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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...
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It is widely accepted that species are most abundant at the center of their geographic ranges and become progressively rarer toward range limits. Although the abundant center model (ACM) has rarely been tested with range-wide surveys, it influences much thinking about the ecology and evolution of sp...
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In 1973-75, larval blackflies were sampled for mermithid nematodes in 83 streams in Newfoundland, Canada. Prosimulium mixtum/fuscum and Simulium venustum were the predominant hosts of Neomesomermis flumenalis but rates of infection in late-instar larvae were generally low (4.3 plus or minus 0.7% and...
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5-Hydroxytryptamine (5-HT) releases a purine nucleotide, which is subsequently converted to adenosine, from primary afferent nerve terminals in vitro. This release may mediate spinal antinociception by 5-HT. In the present study, we have investigated whether release also occurs from the spinal cord ...
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The monotypic delesseriaceous genus Opephyllum was created by Schmitz in Schmitz and Hauptfleisch for O. martensii, represented by a single collection from Zamboanga on the southwestern tip of Mindanao in the southern Philippines. As the type specimen or collection is no longer in existence, we are ...
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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 ...