Spatial Distribution of a Population of Snails<i>Helix aspersa maxima</i>(Mollusc, Gastropoda) in Outdoor Rearing Parks

Attia, J.; Blanc, Alain; Hassnaoui, M.; Rehaïlia, M.; Buisson, Bernard

doi:10.1080/09712119.1997.9706161

Cited by 3 publications

(2 citation statements)

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“…Each animal was measured over a 45‐min period, but SMR was estimated as the total average of the last 30 min of each recording. Respirometric trials were performed during the day, which corresponds to the resting phase in this species (Bailey 1975; Attia et al 1997). In addition, animals were deprived of food for 18 h prior to measurement, which was enough time to attain a postabsorptive state based on preliminary measurements of mean retention time in this species (P. Artacho, T. Catalán, and R.F.…”

Section: Methodsmentioning

confidence: 99%

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NATURAL SELECTION REDUCES ENERGY METABOLISM IN THE GARDEN SNAIL,HELIX ASPERSA(CORNU ASPERSUM)

2009

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Phenotypic selection is widely recognized as the primary cause of adaptive evolution in natural populations, a fact that has been documented frequently over the last few decades, mainly in morphological and life-history traits. The energetic definition of fitness predicts that natural selection will maximize the residual energy available for growth and reproduction, suggesting that energy metabolism could be a target of selection. To address this problem, we chose the garden snail, Helix aspersa (Cornu aspersum).We performed a seminatural experiment for measuring phenotypic selection on standard metabolic rate (SMR), the minimum cost of maintenance in ectotherm organisms. To discount selection on correlated traits, we included two additional whole-organism performance traits (mean speed and maximum force of dislodgement). We found a combination of linear (negative directional selection, β = −0.106 ± 0.06; P = 0.001) and quadratic (stabilizing selection, γ = −0.012 ± 0.033; P = 0.061) selection on SMR. Historically, natural selection has been recognized as the main mechanism explaining adaptive evolution (Endler 1986). This claim is supported by extensive empirical studies on morphological (e.g

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Section: Methodsmentioning

confidence: 99%

“…A dynamometer was quickly connected to the thread on the snail's shell and slowly pulled up until the individual detached from the substrate. All measurements were performed at 20°C and with a prior fasting period of 18 h, and were assessed at the beginning of the active cycle (i.e., night) (Bailey 1975; Attia et al 1997).…”

Section: Methodsmentioning

confidence: 99%

NATURAL SELECTION REDUCES ENERGY METABOLISM IN THE GARDEN SNAIL,HELIX ASPERSA(CORNU ASPERSUM)

2009

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Effect of light and substratum structural complexity on microhabitat selection by the snail Helix aspersa müller

Perea

García

Gómez

et al. 2007

Journal of Molluscan Studies

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Concealed semantic and episodic autobiographical memory electrified

Ganis¹,

Schendan²

2013

Front. Hum. Neurosci.

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Electrophysiology-based concealed information tests (CIT) try to determine whether somebody possesses concealed information about a crime-related item (probe) by comparing event-related potentials (ERPs) between this item and comparison items (irrelevants). Although the broader field is sometimes referred to as “memory detection,” little attention has been paid to the precise type of underlying memory involved. This study begins addressing this issue by examining the key distinction between semantic and episodic memory in the autobiographical domain within a CIT paradigm. This study also addresses the issue of whether multiple repetitions of the items over the course of the session habituate the brain responses. Participants were tested in a 3-stimulus CIT with semantic autobiographical probes (their own date of birth) and episodic autobiographical probes (a secret date learned just before the study). Results dissociated these two memory conditions on several ERP components. Semantic probes elicited a smaller frontal N2 than episodic probes, consistent with the idea that the frontal N2 decreases with greater pre-existing knowledge about the item. Likewise, semantic probes elicited a smaller central N400 than episodic probes. Semantic probes also elicited a larger P3b than episodic probes because of their richer meaning. In contrast, episodic probes elicited a larger late positive complex (LPC) than semantic probes, because of the recent episodic memory associated with them. All these ERPs showed a difference between probes and irrelevants in both memory conditions, except for the N400, which showed a difference only in the semantic condition. Finally, although repetition affected the ERPs, it did not reduce the difference between probes and irrelevants. These findings show that the type of memory associated with a probe has both theoretical and practical importance for CIT research.

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Spatial Distribution of a Population of SnailsHelix aspersa maxima(Mollusc, Gastropoda) in Outdoor Rearing Parks

Abstract: Attia, J., Blanc, A., Hassnaoui, M., Rehailia, M. and Buisson, B. Spatial distribution of a population of snails

Cited by 3 publications

References 11 publications

NATURAL SELECTION REDUCES ENERGY METABOLISM IN THE GARDEN SNAIL,HELIX ASPERSA(CORNU ASPERSUM)

NATURAL SELECTION REDUCES ENERGY METABOLISM IN THE GARDEN SNAIL,HELIX ASPERSA(CORNU ASPERSUM)

Effect of light and substratum structural complexity on microhabitat selection by the snail Helix aspersa müller

Concealed semantic and episodic autobiographical memory electrified

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