Gastropods on land: phylogeny, diversity and adaptive morphology.

Barker, G. M.

doi:10.1079/9780851993188.0001

Cited by 144 publications

(164 citation statements)

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“…Stylommatophoran gastropods are simultaneous hermaphrodites, with a tendency for protandry in at least some lineages (Barker 2001b). The presence of both male and female reproductive organs in a single individual adds a dimension to dispersal/reproduction trade-offs, which play a key role in the evolution of dispersal (Ims and Hjermann 2001;Danchin and Cam 2002).…”

Section: Introductionmentioning

confidence: 99%

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Stage‐ and weather‐dependent dispersal in the brown garden snailCornu aspersum

2013

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Dispersal decisions are often condition-dependent, influenced by the interaction of individual phenotype and environmental conditions. Terrestrial Gastropods are simultaneous hermaphrodites, a reproductive system rarely studied in the context of dispersal. Moreover, the energetic cost of their movement is one of the highest among animals. Despite these features, which make them valuable models to understand the trade-offs between dispersal and other lifehistory traits, their dispersal strategies have been barely explored. We studied the movements of subadults and adults of the brown garden snail Cornu aspersum in a semi-natural 4-patch network, for two months in 2011 (a dry year) and one month in 2012 (a wet year). We assessed the effects of life-history stage (subadult/adult) and weather conditions on dispersal propensity and dispersal speed. Snails were more mobile under humid and warm weather, but nearly all individuals left patches when the relative humidity was close to 100 % in 2012. Because such humidity levels are potentially lethal to C. aspersum, we argue these extreme emigration rates might be an emergency escape response to harmful conditions. Despite a theoretically higher cost of movement, we found that subadults emigrated more, and dispersed faster and further, than adults. Thus, and contrary to what was expected, direct costs of movement do not play the main role in shaping dispersal in C. aspersum. Observed differences between subadults and adults in dispersal behaviour are discussed in the context of intraspecific competition, inbreeding avoidance and relative costs of male and female reproduction.

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Section: Introductionmentioning

confidence: 99%

“…Despite being one of the most studied land snail species (see references in Barker 2001b), there is no available information about its active dispersal in the literature. However, in C. aspersum and some related species, the level of locomotor activity has been shown to vary between lifehistory stages (Oosterhoff 1977;Fearnley 1993).…”

Section: Introductionmentioning

confidence: 99%

Stage‐ and weather‐dependent dispersal in the brown garden snailCornu aspersum

2013

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“…Discussion: The species was originally described in the genus Carychium, a Holartic genus and one of the few exclusively terrestrial animals of the family Ellobiidae (Morton, 1955;Barker, 2001). The apertural dentition is conspicuous in the family (Martins, 1996) and was the single character used by Ferreira & Coelho (1971) in their original classification.…”

Section: Family Ferussaciidae Genus Cecilioides Férussac 1814mentioning

confidence: 99%

“…Clearly, Itaboraí was a calcareous basin, something that alone could attract many pulmonates (Barker, 2001;Cook, 2001;Pearce & Örstan, 2006). However, due to the great diversity of the Itaborahian pulmonate paleofauna, it is plausible to imagine that a fair amount of the other conditions should have also been present.…”

Section: Gastrocopta Itaboraiensismentioning

confidence: 99%

Taxonomic revision of the fossil pulmonate mollusks of Itaboraí Basin (Paleocene), Brazil

Salvador¹,

Simone²

2013

Pap. Avulsos Zool. (São Paulo)

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“…avoid direct sunlight and prefer to forage at low tide when the sky is overcast (Arey and Crozier, 1921;Pepe and Pepe, 1985;Weiss and Wägele, 1998). The Onchidiidae are chiefly found throughout the tropics of the Pacific and Indian oceans (Stringer, 1969;Kenny and Smith, 1987;Barker, 2001;Dayrat, 2009). The genus Onchidella, however, whilst having an extensive global distribution including temperate habitats, is absent from the tropical Indo-West Pacific (Dayrat, 2009).…”

Section: Introductionmentioning

confidence: 99%