scholarly journals Observations on the predation of the snail Huttonella bicolor on the snail Allopeas gracile

2019 ◽  
pp. 131-136
Author(s):  
Gargi Nandy ◽  
Himangshu Barman ◽  
Soujita Pramanik ◽  
Kaustav Paul ◽  
Gautam Aditya ◽  
...  
Keyword(s):  
Population Regulation ◽  
Biocontrol Agent ◽  
Prey Size ◽  
Land Snail ◽  
Size Class ◽  
Separate Experiment ◽  
Snail Species ◽  
Predator Density ◽  
Terrestrial Habitats ◽  
Varied Size

The predatory snail Huttonella bicolor (Hutton 1834) (Gastropda: Streptaxidae) was encountered along with Allopeas gracile (Hutton 1834) (Gastropoda: Subulinidae) during a survey of small land snail species from several terrestrial habitats in Kolkata, India. An evaluation of the predation of H. bicolor as a function of prey size and predator density was carried out using A. gracile as a model prey snail. The predatory interactions were noted with an increasing ratio of 1, 2 and 4 H. bicolor against 10 A. gracile of varied size classes in a defined terrarium. At the end of a 48 h period of exposure, H. bicolor was observed to consume on an average 5.32 ± 0.50 snails depending on the size class and the predator density. The predation pattern varied significantly with the prey size class, as revealed through the logistic equation, y (prey-consumed) = 1 / (1 + exp (-(0.97–0.71*size class-prey))). In a separate experiment, it was observed that the presence of H. bicolor induced a reduction in the fecundity in A. gracile, as revealed through the logistic regression, y (egg laid) = 1 / (1 + exp(-(3.45–0.67*predator-density))). The direct effect of predation and indirect effect of oviposition reduction reflect the efficacy of H. bicolor on population regulation of A. gracile. In view of conservation biological control, the use of the snail H. bicolor as a biocontrol agent may prove beneficial in situations where A. gracile is a pest.

scholarly journals The exotic gastropod Clea helena (von dem Busch, 1847) as a predator of freshwater gastropods: a threat to native biota in India?

2021 ◽  
Vol 21 (1) ◽  
pp. 55-62
Author(s):  
Pranesh Paul ◽  
Koushik Paul ◽  
Rupsha Karmakar ◽  
Arnab Shee ◽  
Debaditya Kumar ◽  
...  
Keyword(s):  
Prey Density ◽  
Prey Species ◽  
Prey Size ◽  
Freshwater Ecosystems ◽  
Size Class ◽  
Prey Consumption ◽  
Freshwater Snails ◽  
Snail Species ◽  
Species Identity ◽  
Freshwater Gastropods

Abstract The carnivorous snail Clea (Anentome) helena (von dem Busch, 1847) (Gastropoda: Nassariidae), commonly called as the “assassin snail” is sold worldwide including India for aesthetics and the ability to kill pest snails in aquaria. Assuming invasion as a fair possibility, the predation potential of C. helena on seven native freshwater snails was assessed. The exotic predator consumed all the native snail species provided in the experiment and prey consumption varied with the prey species identity, the prey density and the prey size class. Future colonization and establishment of C. helena in Indian freshwater ecosystems may reduce the abundance of the native gastropod snails, in absence of suitable intervention.

scholarly journals Deep genetic structure at a small spatial scale in the endangered land snail Xerocrassa montserratensis

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Cristina Català ◽  
Vicenç Bros ◽  
Xavier Castelltort ◽  
Xavier Santos ◽  
Marta Pascual
Keyword(s):  
Genetic Structure ◽  
Land Snail ◽  
Snail Species ◽  
Small Spatial Scale ◽  
Geographic Ranges ◽  
Genetic Groups ◽  
Species Of Conservation Concern ◽  
Conservation Actions ◽  
Conservation Concern ◽  
Single Locality

AbstractSpecies with small geographic ranges do not tend to have a high genetic structure, but some land snail species seem to be an exception. Xerocrassa montserratensis, an endangered land snail endemic to Catalonia (northeastern Iberian Peninsula), is an excellent model to study the processes affecting the phylogeography of specialized species of conservation concern. This species is restricted to xerophilous stony slopes and occurs within a small and fragmented area of ca. 500 km2. We sequenced the COI barcode region of 152 individuals from eight sites covering the entire range of the species. We found four genetic groups mostly coincident with their geographic distribution: a central ancestral group containing shared haplotypes among five localities and three groups restricted to a single locality each. Two of these derived groups were geographically and genetically isolated, while the third and most differentiated group was not geographically isolated. Geomorphologic and paleoclimatic processes during the Pleistocene can explain the divergence found between populations of this low dispersal species with historical fragmentation and secondary contacts. Nonetheless, recent passive large dispersal through streams was also detected in the central group. Overall, our study uncovered four evolutionary units, partially matching morphologically described subspecies, which should be considered in future conservation actions.

Organ- and species-specific accumulation of metals in two land snail species (Gastropoda, Pulmonata)

2013 ◽  
Vol 449 ◽  
pp. 470-481 ◽  
Author(s):  
Magdalena Boshoff ◽  
Kurt Jordaens ◽  
Thierry Backeljau ◽  
Suzanna Lettens ◽  
Filip Tack ◽  
...  
Keyword(s):  
Land Snail ◽  
Snail Species ◽  
Specific Accumulation ◽  
Accumulation Of Metals ◽  
Species Specific

Introduction of the Predatory Land Snail Species Poiretia delesserti (Spiraxidae) in France

Malacologia ◽  
2021 ◽  
Vol 63 (2) ◽  
Author(s):  
Bernhard Hausdorf ◽  
Stephan Solvery
Keyword(s):  
Land Snail ◽  
Snail Species

Behavioural aspects of microhabitat segregation of different age stages in the wetland land snail Vertigo moulinsiana (Eupulmonata: Vertiginidae) in the laboratory

2020 ◽  
Vol 86 (3) ◽  
pp. 228-232
Author(s):  
Zofia Książkiewicz-Parulska
Keyword(s):  
High Temperature ◽  
Land Snail ◽  
Snail Species ◽  
High Humidity ◽  
Short Period ◽  
Temperature And Humidity ◽  
In The Wild ◽  
Different Response ◽  
Behavioural Aspects ◽  
Microhabitat Segregation

ABSTRACT This laboratory study investigated behavioural differences between adults and juveniles of the wetland land snail species Vertigo moulinsiana with respect to temperature and humidity. Juveniles of V. moulinsiana, for example, tend to remain within the shaded, humid and cool layer of the litter, while adults usually climb above wet vegetation to a height of over 2 m. Adults are thus exposed to greater variation in temperature and humidity than juveniles. My experiments showed that adults of V. moulinsiana remain active longer than juveniles when subject to high temperature (36 °C) and low relative humidity (RH 30%). Conversely, juveniles stay active longer than adults in high humidity (22 °C, RH 100%). A short period of starvation lengthened the time needed for the juveniles to become active after dormancy, possibly indicating a different response between adults and juveniles to lack of nutritional reserves. These behavioural differences to food availability and the risk of water loss correspond to the microhabitat differences observed between adults and juveniles in the wild.

scholarly journals Intraspecific range dynamics and niche evolution in Candidula land snail species

2007 ◽  
Vol 90 (2) ◽  
pp. 303-317 ◽  
Author(s):  
MARKUS PFENNINGER ◽  
CARSTEN NOWAK ◽  
FRÉDÉRIC MAGNIN
Keyword(s):  
Land Snail ◽  
Snail Species ◽  
Niche Evolution ◽  
Range Dynamics

scholarly journals The direct cost of traumatic secretion transfer in hermaphroditic land snails: individuals stabbed with a love dart decrease lifetime fecundity

2015 ◽  
Vol 282 (1804) ◽  
pp. 20143063 ◽  
Author(s):  
Kazuki Kimura ◽  
Satoshi Chiba
Keyword(s):  
Direct Cost ◽  
Sexual Conflict ◽  
Mating Behaviour ◽  
Land Snail ◽  
Fertilization Success ◽  
Land Snails ◽  
Snail Species ◽  
Arms Races ◽  
Lifetime Fecundity ◽  
Sperm Donors

Several taxa of simultaneously hermaphroditic land snails exhibit a conspicuous mating behaviour, the so-called shooting of love darts. During mating, such land snail species transfer a specific secretion by stabbing a mating partner's body with the love dart. It has been shown that sperm donors benefit from this traumatic secretion transfer, because the secretions manipulate the physiology of a sperm recipient and increase the donors' fertilization success. However, it is unclear whether reception of dart shooting is costly to the recipients. Therefore, the effect of sexual conflict and antagonistic arms races on the evolution of traumatic secretion transfer in land snails is still controversial. To examine this effect, we compared lifetime fecundity and longevity between the individuals that received and did not receive dart shooting from mating partners in Bradybaena pellucida . Our experiments showed that the dart-receiving snails suffered reduction in lifetime fecundity and longevity. These results suggest that the costly mating behaviour, dart shooting, generates conflict between sperm donors and recipients and that sexually antagonistic arms races have contributed to the diversification of the morphological and behavioural traits relevant to dart shooting. Our findings also support theories suggesting a violent escalation of sexual conflict in hermaphroditic animals.

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