Factors inducing aestivation of the giant African land snail Achatina fulica Bowdich (Gastropoda: Achatinidae)

Rahman, Mohammad Sohelur; Raut, S. K.

doi:10.1007/s12595-010-0006-4

Cited by 18 publications

(11 citation statements)

References 10 publications

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“…Terrestrial invasive gastropods like Lissachatina fulica prefer high humidity conditions for growth and thus their activity is restricted to the periods of ISM or southwest monsoon, when temperatures are typically in the range of 15–28°C (Rahman & Raut, ). Higher rainfall amounts (>50 mm/week) are always associated with higher ambient humidity and can act as triggers to successfully terminate aestivation in L. fulica .…”

Section: Resultsmentioning

confidence: 99%

Extreme Monsoon Rainfall Signatures Preserved in the Invasive Terrestrial Gastropod Lissachatina fulica

Ghosh

Rangarajan

Thirumalai

et al. 2017

Geochem Geophys Geosyst

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Indian summer monsoon (ISM) rainfall lasts for a period of 4 months with large variations recorded in terms of rainfall intensity during its period between June and September. Proxy reconstructions of past ISM rainfall variability are required due to the paucity of long instrumental records. However, reconstructing subseasonal rainfall is extremely difficult using conventional hydroclimate proxies due to inadequate sample resolution. Here, we demonstrate the utility of the stable oxygen isotope composition of gastropod shells in reconstructing past rainfall on subseasonal timescales. We present a comparative isotopic study on present day rainwater and stable isotope ratios of precipitate found in the incremental growth bands of giant African land snail Lissachatina fulica (Bowdich) from modern day (2009) and in the historical past (1918). Isotopic signatures present in the growth bands allowed for the identification of ISM rainfall variability in terms of its active and dry spells in the modern as well as past gastropod record. Our results demonstrate the utility of gastropod growth band stable isotope ratios in semiquantitative reconstructions of seasonal rainfall patterns. High resolution climate records extracted from gastropod growth band stable isotopes (museum and archived specimens) can expand the scope for understanding past subseasonal‐to‐seasonal climate variability.

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Section: Resultsmentioning

confidence: 99%

Extreme Monsoon Rainfall Signatures Preserved in the Invasive Terrestrial Gastropod Lissachatina fulica

Ghosh

Rangarajan

Thirumalai

et al. 2017

Geochem Geophys Geosyst

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“…It was reported that the type of plant foods, the length of starvation, the degree of temperature, and percentage of relative humidity are the factors that induce estivation. In estivation state, snails overcome the unfavorable conditions by adjusting their physiological conditions (Rehman and Raut ). To our knowledge, a detail survey of culturable and uncultured bacteria in the whole GI tract of this snail has not been carried out so far.…”

Section: Introductionmentioning

confidence: 99%

Bacterial diversity in different regions of gastrointestinal tract of Giant African Snail (Achatina fulica)

et al. 2012

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The gastrointestinal (GI) tract of invasive land snail Achatina fulica is known to harbor metabolically active bacterial communities. In this study, we assessed the bacterial diversity in the different regions of GI tract of Giant African snail, A. fulica by culture-independent and culture-dependent methods. Five 16S rRNA gene libraries from different regions of GI tract of active snails indicated that sequences affiliated to phylum γ-Proteobacteria dominated the esophagus, crop, intestine, and rectum libraries, whereas sequences affiliated to Tenericutes dominated the stomach library. On phylogenetic analysis, 30, 27, 9, 27, and 25 operational taxonomic units (OTUs) from esophagus, crop, stomach, intestine, and rectum libraries were identified, respectively. Estimations of the total bacterial diversity covered along with environmental cluster analysis showed highest bacterial diversity in the esophagus and lowest in the stomach. Thirty-three distinct bacterial isolates were obtained, which belonged to 12 genera of two major bacterial phyla namely γ-Proteobacteria and Firmicutes. Among these, Lactococcus lactis and Kurthia gibsonii were the dominant bacteria present in all GI tract regions. Quantitative real-time polymerase chain reaction (qPCR) analysis indicated significant differences in bacterial load in different GI tract regions of active and estivating snails. The difference in the bacterial load between the intestines of active and estivating snail was maximum. Principal component analysis (PCA) of terminal restriction fragment length polymorphism suggested that bacterial community structure changes only in intestine when snail enters estivation state.

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“…It is appear from our results that the emergence of the aestivated snails is strongly influenced by the changes of temperature (aestivated snails were more active at temperature 25 0 C and became less active with increasing temperature), that trigger the genetic process and induce aestivation in snails (Rahman and Raut, 2010).This finding is in accordance with that obtained by Ali and Suleman,( 1992) who assured that in Pakistan both the adult and immature stages snails of M.obstructa were more active during wet days of spring months where the prevailing temperatures were around 25 0 C and become inactive during the summer months and they either died or aestivated, as large numbers of empty shells and dormant snails were observed.…”

Section: -The Effect Of Temperatures On Food Consumption Of Juvenile and Adult Stages Of M Cartusianamentioning

confidence: 66%

Some Ecological Factors Influencing Egg Hatching, Incubation Period, Food Consumption and Aestivation of Monacha cartusiana Snails Under Laboratory Conditions

Abdel-Kader

Lokma

2018

Journal of Plant Protection and Pathology

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This study was conducted on the land snail Monacha cartusiana to determine the influence of four different degrees of temperature (18, 20, 22 and 24 0 C) treated with four levels of soil moisture (25,50,75 and 100% field capacity) on egg hatching and developmental period and to define the activity of snails during aestivation and food consumption under the effect of seven temperature degree ranges (5,10,15, 20, 25,30 and 35 0 C) under laboratory conditions. The present data revealed that the optimum temperature (22 0 C) for the highest percent of egg hatching was (78 and 76%) treated with 75 and 100% of soil field capacity and the shortest incubation and hatching period were 4.6 and 0.8 days at 24 0 C with 75% soil moisture and at 20 0 C with 50% soil moisture, respectively. Food intake by M. cartusiana on cabbage leaves was directly related to temperature and the land snail sizes. Feeding was maximal at 20 and 35 0 C for juveniles (8-9, 10-11mm) and at 5 and 35 0 C for all sizes of adults. All juveniles sizes showed higher food intake rate (general mean,31.14mg) than the adult sizes (general mean,30.20mg), as it increased by increasing only the shell size of all juveniles indicated by the general mean which could be arranged in an ascending order as follows, 29.03, 31.04 and 33.37 mg for the size of (8-9), (9-10) and (10-11 mm), respectively, during three days. When the aestivated snails were exposed to serial levels of temperature degrees (starting from 10 to 40 0 C,15 to 40 0 C, 20 to 40 0 C, 25 to 40 0 C and 30 to 40 0 C), were more active (19.2, 50, 17.2, and 3.6%) at temperature 25 0 C and became less active with increasing temperature (0.4, 6.4, 7.6, 5.6 and 4%) at 40 0 C. By the end of the experiment, all the aestivated snails become epiphragmed and only died when exposed suddenly to a lower temperature, while it still alive when exposed to higher temperature.

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Factors inducing aestivation of the giant African land snail Achatina fulica Bowdich (Gastropoda: Achatinidae)

Cited by 18 publications

References 10 publications

Extreme Monsoon Rainfall Signatures Preserved in the Invasive Terrestrial Gastropod Lissachatina fulica

Extreme Monsoon Rainfall Signatures Preserved in the Invasive Terrestrial Gastropod Lissachatina fulica

Bacterial diversity in different regions of gastrointestinal tract of Giant African Snail (Achatina fulica)

Some Ecological Factors Influencing Egg Hatching, Incubation Period, Food Consumption and Aestivation of Monacha cartusiana Snails Under Laboratory Conditions

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