Conchological variation in Pomacea canaliculata and other South American Ampullariidae (Caenogastropoda, Architaenioglossa).

Universidad Nacional del Sur, Departamento de Biología, Bioquímica y Farmacia, San Juan 670, 8000 Bahía Blanca, Argentina.
Biocell: official journal of the Sociedades Latinoamericanas de Microscopía Electronica ... et. al (Impact Factor: 0.73). 09/2006; 30(2):329-35.
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    Journal of Molluscan Studies 04/2014; 80(2):117-122. DOI:10.1093/mollus/eyt054 · 1.50 Impact Factor
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    ABSTRACT: The golden apple snail (Pomacea canaliculata), an invasive freshwater species in Asia, has become a serious agricultural pest. Water temperature is one of the most important environmental factors influencing the survival, growth rate, reproduction and behavior of freshwater snails. For this reason, the behavioral periodicity of golden apple snails was examined at different water temperatures (15 °C, 20 °C, 25 °C, and 30 °C). We classified the snails' behaviors into 12 pre-defined categories each minute for 2 days at each temperature. Five dominant behavioral categories (clinging to the side of the aquarium [clinging], clinging with sprawling out its antennae [clinging-NM], crawling on the bottom of the aquarium, crawling on the side of the aquarium and feeding) were selected for further analyses. Spectral analysis and cross-spectral analysis were applied to determine the periodicity of these behaviors. Snails spent less time in moving during photophase than scotophase at all temperatures. Behavioral periodicity was much longer at lower temperatures, for both motion and motionless behaviors except clinging-NM. Detrended correspondence analysis based on periodogram values clearly characterized the differences in behavior at the various temperatures. Behavioral turnover, assessed by cross-spectral analysis, was faster at higher temperatures, and Markov chain analysis supported this result by finding a lower probability of maintaining the current behavior at higher temperatures.
    Ecological Informatics 02/2015; DOI:10.1016/j.ecoinf.2015.02.004 · 1.98 Impact Factor
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    ABSTRACT: This study investigated the behaviour of Pomacea bridgesii, describing the daily activity, substrate selection and the influence of the flood regime in the Amazon, the species’ native habitat. The present study described the daily activity and substrate selection, and evaluated the activity adaptations of the gastropods in a simulated flood-pulse regime. Gastropods were collected in Amazonas, Brazil, in June 2013. Assessments of the daily behaviour, substrate selection, and flood-pulse simulation were made in experimental water tanks. The snails were observed hourly for 48 h, and their behaviour recorded on an ethogram. The snails were more active during the night, when up to 80% of them moved about. In general, during both day and night, the gastropods used the pebble substrate most often. Comparing the day periods, a significant proportion of the individuals that were using the pebbles moved to other substrates (t ¼ 5; d.f. ¼ 2; P ¼ 0.03). The interaction of the behaviour of P. bridgesii with the simulated flood-pulse regime showed a statistical difference between the dry period and the period of maximum water level. The water regime of the Amazon floodplain directly influenced the activity of P. bridgesii, with responses including self-burying and activity interruption, with the operculum closed to minimise water loss.
    Marine and Freshwater Research 03/2015; DOI:10.1071/MF14066 · 2.25 Impact Factor


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