Phenotypic Changes in the Progeny of Nucella Lapillus (Gastropoda) Transplanted From an Exposed Shore to Sheltered Inlets

Gibbs, P. E.

doi:10.1093/mollus/59.2.187

Cited by 39 publications

(34 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Aphalia is a genetic deficiency, known as the Dumpton syndrome, characterized by the absence of a male sexual feature, in which females exposed to organotin compounds develop only a vas deferens, as has already been observed in Nucella lapillus and Ocenebrina erinacea populations (Gibbs, 1993;Ohelmann et al, 1996;Ribeiro-Ferreira, 2002). Ribeiro-Ferreira (2002) emphasized the need for an imposex scale specific to Stramonita haemastoma, after the significant occurrence of aphalic individuals in his induction experiment.…”

Section: Discussionmentioning

confidence: 90%

Imposex induction in Stramonita haemastoma floridana (Conrad, 1837) (Mollusca: Gastropoda: Muricidae) submitted to an organotin-contaminated diet

Lima

Castro²,

Rocha‐Barreira³

2006

Braz. j. oceanogr.

View full text Add to dashboard Cite

A B S T R A C TMarine organisms are affected by organotin compounds due to the cumulative, deleterious effects of these latter. The most evident and well known consequence of organotin contamination is imposex, a hormonal disruption that causes a superimposition of sexual male features in females of prosobranchia neogastropod molluscs such as Stramonita haemastoma floridana. Molluscs accumulate organotins mainly because of their poor ability to eliminate TBT and DBT from their tissues. The aim of this study was to analyze organotin uptake by ingestion experimentally, using uncontaminated subjects (S. haemastoma floridana) fed with organotin-contaminated oysters (Crassostrea rhizophorae). A total of 248 gastropods, distributed in 7 tanks with uncontaminated water and contaminated food, were used in this study, a control group being fed uncontaminated oysters. Every 15 days, the individuals of one of the tanks were examined for the presence of imposex. Development of imposex was measured using the VDSI, RPSI and RPLI indexes. The animals had already developed imposex within the first 15 days, all the indexes measured (RPLI, RPSI and VDSI) having increased significantly with duration of exposure, indicating that the animals were probably contaminated by the food and had accumulated the pollutant. New paths of imposex development were also observed. R E S U M OOrganismos marinhos são afetados por compostos organoestânicos que causam uma série de efeitos deletérios aos mesmos. O mais conhecido efeito da contaminação por organoestânicos é o imposex. Esse fenômeno consiste na masculinização de fêmeas de moluscos neogastrópodes tais como Stramonita haemastoma floridana. Esses compostos tendem a se acumular em moluscos devido a sua baixa capacidade de eliminá-los. Um total de 248 indivíduos de S. haemastoma floridana foram coletados de uma população livre qualquer indício de imposex. Esses animais foram mantidos em 7 aquários, com aproximadamente 30 indivíduos cada, 1 desses aquários foi considerado como controle e os animas do mesmo alimentados com ostras obtidas de locais onde não se verificou a ocorrência de imposex em neogastrópodes nativos. Os animais nos outros 6 aquários foram alimentados com ostras obtidas em local onde a incidência de imposex entre os gastrópodes nativos revelou-se muito alta. A cada 15 dias, por um período total de 90 dias, os animais de um dos tanques eram retirados e analisados quanto à presença de imposex. Os níveis de imposex foram quantificados através da % de imposex e dos índices: RPLI, RPSI e VDSI. Observou-se a indução de imposex em S. haemastoma floridana através da dieta a partir de Crassostrea rhizophora e um aumento significativo dos índices com o decorrer do tempo de exposição. Os animais do aquário controle foram analisados ao fim do experimento não revelando qualquer indício de imposex.

show abstract

Section: Discussionmentioning

confidence: 90%

Imposex induction in Stramonita haemastoma floridana (Conrad, 1837) (Mollusca: Gastropoda: Muricidae) submitted to an organotin-contaminated diet

Lima

Castro²,

Rocha‐Barreira³

2006

Braz. j. oceanogr.

View full text Add to dashboard Cite

show abstract

“…Many studies have found a genetic component to morphological variation in gastropods, particularly in the case of discrete characters, such as color and pattern (e.g., Cain et al 1960;Atkinson and Warwick 1983;Palmer 1984Palmer , 1985a. Control of variation in continuous morphological characters, such as shape, is less well understood, although there is evidence for both plastic (Phillips et al 1973;Kemp and Bertness 1984;Boulding and Hay 1993;Gibbs 1993) and genetic (Newkirk and Doyle 1975;Crothers 1980;Palmer 1985b;Johannesson and Johannesson 1996; Parsons 1997) components of variation.…”

Section: Discussionmentioning

confidence: 99%

Ecological Opportunity in Adaptive Radiation of Galápagos Endemic Land Snails

Parent

Crespí

2009

The American Naturalist

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. abstract: The classic evolutionary hypothesis of ecological opportunity proposes that both heterogeneity of resources and freedom from enemies promote phenotypic divergence as a response to increased niche availability. Although phenotypic divergence and speciation have often been inferred to be the primary consequences of the release from competition or predation that accompanies a shift to a new adaptive zone, increased phenotypic variation within species is expected to represent the first stage resulting from such a shift. Using measures of intraspecific morphological variation of 30 species of Galápagos endemic land snails in a phylogenetically controlled framework, we show that the number of local congeners and the number of local plant species are associated with lower and higher intraspecific phenotypic variation, respectively. In this clade, ecological opportunity thus explicitly links the role of competition from congeners and the heterogeneity of resources to the extent of intraspecific phenotypic divergence as adaptive radiation proceeds.

show abstract

“…Experimental studies have demonstrated both genetic (e.g., Newkirk and Doyle 1975;Johannesson and Johannesson 1996) and environmental (e.g., Kemp and Bertness 1984;Gibbs 1993) control of variation in shell shape in intertidal snails. In Littorina obtusata, geographic variation in shell morphology has been shown to be heritable, but it is also influenced by variables such as water velocity and the presence or absence of a predator (Trussell 2000(Trussell , 2002.…”

Section: Discussionmentioning

confidence: 99%

Rapid evolutionary responses in a translocated population of intertidal snail (Bembicium vittatum) utilise variation from different source populations

2007

View full text Add to dashboard Cite

The artificial movement of individuals between populations (translocation) can be an effective way to increase genetic diversity within populations, but few studies have undertaken long term genetic monitoring to determine if variation introduced by translocation is maintained over many generations or whether it can be used to adapt to local conditions. Here, we report on the changes in morphological and molecular variation over a 12-year period in a population of an intertidal littorine snail (Bembicium vittatum) that was created by mixing individuals from three geographically disjunct populations. These source populations differ genetically in shell shape and in allele frequency at several allozyme loci. We found that the translocated population had higher allozyme diversity than any of the source populations and that this pattern was maintained over multiple generations. Variation in shell shape also increased, but this declined over time as shells became taller. Some allozyme loci also showed significant changes in frequency over time. These changes were not consistently towards the genetic makeup of a single source population, and in the case of shell shape, were towards a phenotype that was most suited to the local environment. Our results suggest that genetic variation introduced into a population by translocation can be rapidly incorporated and used to adapt to local conditions without domination by a single source population's genome. However, more studies are needed before generalisations on the benefits of mixing individuals from disjunct populations can be made.

show abstract

Phenotypic Changes in the Progeny of Nucella Lapillus (Gastropoda) Transplanted From an Exposed Shore to Sheltered Inlets

Cited by 39 publications

References 0 publications

Imposex induction in Stramonita haemastoma floridana (Conrad, 1837) (Mollusca: Gastropoda: Muricidae) submitted to an organotin-contaminated diet

Imposex induction in Stramonita haemastoma floridana (Conrad, 1837) (Mollusca: Gastropoda: Muricidae) submitted to an organotin-contaminated diet

Ecological Opportunity in Adaptive Radiation of Galápagos Endemic Land Snails

Rapid evolutionary responses in a translocated population of intertidal snail (Bembicium vittatum) utilise variation from different source populations

Contact Info

Product

Resources

About