Delayed Selfing and Resource Reallocations in Relation to Mate Availability in the Freshwater Snail Physa acuta

2003 ◽  
Vol 162 (4) ◽  
pp. 474-488 ◽  
Author(s):  
Anne Tsitrone ◽  
Philippe Jarne ◽  
Patrice David
Keyword(s):  
Freshwater Snail ◽  
Mate Availability ◽  
Physa Acuta ◽  
Delayed Selfing

scholarly journals NO CORRELATION BETWEEN INBREEDING DEPRESSION AND DELAYED SELFING IN THE FRESHWATER SNAIL PHYSA ACUTA

Evolution ◽  
2007 ◽  
Vol 61 (11) ◽  
pp. 2655-2670 ◽  
Author(s):  
Juan Sebastián Escobar ◽  
Guillaume Epinat ◽  
Violette Sarda ◽  
Patrice David
Keyword(s):  
Inbreeding Depression ◽  
Freshwater Snail ◽  
Physa Acuta ◽  
Delayed Selfing

scholarly journals Angucycline-like Aromatic Polyketide from a Novel Streptomyces Species Reveals Freshwater Snail Physa acuta as Underexplored Reservoir for Antibiotic-Producing Actinomycetes

Antibiotics ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 22
Author(s):  
Nasim Safaei ◽  
Yvonne Mast ◽  
Michael Steinert ◽  
Katharina Huber ◽  
Boyke Bunk ◽  
...  
Keyword(s):  
High Throughput Sequencing ◽  
Genome Mining ◽  
Freshwater Snail ◽  
Whole Genome Sequence ◽  
Phylogenomic Analysis ◽  
Ionization Mass ◽  
Gram Positive ◽  
Streptomyces Species ◽  
Genus Streptomyces ◽  
Physa Acuta

Antibiotic producers have mainly been isolated from soil, which often has led to the rediscovery of known compounds. In this study, we identified the freshwater snail Physa acuta as an unexplored source for new antibiotic producers. The bacterial diversity associated with the snail was characterized by a metagenomic approach using cultivation-independent high-throughput sequencing. Although Actinobacteria represented only 2% of the bacterial community, the focus was laid on the isolation of the genus Streptomyces due to its potential to produce antibiotics. Three Streptomyces strains (7NS1, 7NS2 and 7NS3) were isolated from P. acuta, and the antimicrobial activity of the crude extracts were tested against a selection of Gram-positive and Gram-negative bacteria and fungi. 7NS3 showed the strongest activity against Gram-positive bacteria and, thus, was selected for genome sequencing and a phylogenomic analysis. 7NS3 represents a novel Streptomyces species, which was deposited as Streptomyces sp. DSM 110735 at the Leibniz Institute-German Collection of Microorganisms and Cell Cultures (DSMZ). Bioassay-guided high-performance liquid chromatography (HPLC) and high-resolution electrospray ionization-mass spectrometry (HR-ESI-MS) analyses of crude extract fractions resulted in the detection of four compounds, one of which matched the compound characteristics of emycin A, an angucycline-like aromatic polyketide. Genome mining studies based on the whole-genome sequence of 7NS3 resulted in the identification of a gene cluster potentially coding for emycin A biosynthesis. Our study demonstrates that freshwater snails like P. acuta can represent promising reservoirs for the isolation of new antibiotic-producing actinobacterial species.

Effect of cadmium on the embryos and juveniles of a tropical freshwater snail, Physa acuta (Draparnaud, 1805)

1998 ◽  
Vol 38 (7) ◽  
pp. 263-270 ◽  
Author(s):  
C. C. C. Cheung ◽  
P. K. S. Lam
Keyword(s):  
Early Life ◽  
Freshwater Snail ◽  
Toxicity Tests ◽  
Life Stages ◽  
Early Life Stages ◽  
Physa Acuta ◽  
Ecotoxicological Tests ◽  
Embryonic Growth ◽  
Potential Use ◽  
Tropical Freshwater

The effects of cadmium on early life stages of a freshwater snail, Physa acuta (Draparnaud), were investigated. The 24- and 48-hour LC50 for embryos were 1.27 mg/l (95% confidence interval: 1.13 - 1.42) and 0.85 mg/l (0.71 - 1.01), respectively. The 24- and 48-hour LC50 for juveniles were 1.32 mg/l (1.13 - 1.54) and 1.05 mg/l (0.81 - 1.36), respectively. An increase in cadmium concentrations at sublethal levels resulted in a significant reduction in embryo growth rate and embryo hatchability. Developmental deformities of the embryos were also observed. The NOEC and LOEC for embryonic growth were 0.32 and 0.50 mg/l, respectively, and the LOEC for hatchability was 0.13 mg/l. These results suggest that embryonic growth and hatchability are useful endpoints in chronic toxicity tests. In addition, the potential use of early life stages of pulmonate snails in ecotoxicological tests is discussed.

The influence of TCS on the growth and behavior of the freshwater snail,Physa acuta

2012 ◽  
Vol 47 (11) ◽  
pp. 1626-1630 ◽  
Author(s):  
Jenell Brown ◽  
Melody J. Bernot ◽  
Randall J. Bernot
Keyword(s):  
Freshwater Snail ◽  
Physa Acuta ◽  
And Behavior

Cadmium in vivo exposure alters stress response and endocrine-related genes in the freshwater snail Physa acuta. New biomarker genes in a new model organism

2017 ◽  
Vol 220 ◽  
pp. 1488-1497 ◽  
Author(s):  
Pedro Martínez-Paz ◽  
Mónica Morales ◽  
Paloma Sánchez-Argüello ◽  
Gloria Morcillo ◽  
José Luis Martínez-Guitarte
Keyword(s):  
Stress Response ◽  
Model Organism ◽  
Freshwater Snail ◽  
New Model ◽  
Physa Acuta

Combining the assessment of apical endpoints and gene expression in the freshwater snail Physa acuta after exposure to reclaimed water

2018 ◽  
Vol 642 ◽  
pp. 180-189 ◽  
Author(s):  
Mónica Aquilino ◽  
Jose Luis Martínez-Guitarte ◽  
Pilar García ◽  
Eulalia Maria Beltrán ◽  
Carlos Fernández ◽  
...  
Keyword(s):  
Gene Expression ◽  
Reclaimed Water ◽  
Freshwater Snail ◽  
Physa Acuta
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