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: 0.57). 09/2006; 30(2):329-35.
Source: PubMed

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    • "The successful invasions of Pomacea spp. have stimulated studies around the world, regarding their complex taxonomy (Estebenet et al. 2006; Rawlings et al. 2007; Hayes et al. 2008), reproduction (Bocanegra et al. 1996; Coelho et al. 2012), management (Cowie 2002; Lee and Oh 2006; Yusa et al. 2006), aquaculture (Alves et al. 2006; Souza-Júnior et al. 2013) and some behavioural studies (Kretzschmar and Heckman 1995; Darby et al. 2002; Heiler et al. 2008). Most of these studies were conducted outside their natural range, and only a few have examined the biology or behaviour of species of Pomacea interacting with the floodplain systems where they usually live. "
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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.
    Full-text · Article · Mar 2015 · Marine and Freshwater Research
    • "canaliculata group) contains at least two distinct species: the true P. canaliculata, and the similar P. insularum (d'Orbigny, 1835) (island apple snail). Although the latter is usually larger and somewhat more globose in shape, unequivocal identification requires combined genetic and morphological data (Estebenet et al. 2006; Rawlings et al. 2007; Hayes et al. 2008). Isolation of DNA from archived shells may therefore be the only procedure to assess species identification when no living individuals are available. "
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    ABSTRACT: During the summer of 2009, apple snails (Mollusca: Ampullariidae) of the genus Pomacea were found to have established a self-sustaining population for the first time in Europe (Ebro Delta, Catalonia, Spain). This group is known for its genetic diversity and at least two distinct species are represented in a clade typified by Pomacea canaliculata. Various citations refer to egg size and color, and clutch size, in addition to shell morphology, for distinction between species. However, due to overlapping characters and phenotypic plasticity, genetic analyses are becoming more widely used methods for this group. Herein, we present a method for DNA extraction to identify species with sufficient precision from empty shells recovered from the field. This technique may be of use more widely for analyses of shells archived in museum collections for phylogenetic and taxonomic studies.
    No preview · Article · Feb 2013 · Molluscan Research
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    • "Prior to their use in each trial, 15 snails were maintained in 20 l aquaria with CaCO 3 saturated tap water at 25 ± 2°C and fed on fresh lettuce. Males were recognized by observation of the testicle through the translucent shell (Takeda 1999) or a humped operculum (Estebenet et al. 2006); snails without these male traits were considered sexually undifferentiated if smaller than 25 mm and considered as females if bigger than 25 mm. "
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    ABSTRACT: The invasive Neotropical snail Pomacea canaliculata is usually regarded as amphibious, although the relative significance of aerial and aquatic respiration is unknown. To investigate the degree of dependence on aerial respiration and its influences on microdistribution, experiments were performed in the laboratory and under seminatural and natural conditions. Restriction of aerial respiration negatively affected survivorship, activity and feeding, its effects worsening with temperature and water fouling; females were more seriously affected than males although the effect depended on reproductive effort. Snails were unevenly distributed relative to the access to air, both in a stream and in an outdoor tank, being concentrated less than 2–4m from the nearest emergent substratum. Accessibility to air would be an important trait of waterbodies prone to invasions of P. canaliculata, especially in tropical areas. The effectiveness of some control measures could be increased by focusing on areas where snails are concentrated due to their dependence on air. KeywordsApple snail-Water fouling-Temperature-Surfacing-Survivorship-Activity
    Full-text · Article · Jun 2010 · Biological Invasions
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