Effects of Numbers, Biomass and Conditioning Time on the Growth and Natality Rates of Biomphalaria glabrata (Say) the Snail Host of Schistosom mansoni Sambon

Thomas, J. D.; Benjamin, Marcus

doi:10.2307/2401747

Cited by 10 publications

(3 citation statements)

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“…The high costs of mating in the male role (courtship behaviors, producing and delivering an ejaculate containing sperm and accessory gland proteins) can cause a direct reallocation of resources from female to male function within the same individual (Hoffer et al, 2010). Similar suppression in egg laying after mating or after grouping (in studies where copulations were not monitored) seems to be quite widespread across hermaphroditic gastropods; it has been reported in the sea hare Aplysia brasiliana (Blankenship, Rock, Robbins, Livingston, & Lehman, 1983), the land snail Bradybaena pellucida (Kimura & Chiba, 2015), and the freshwater snail species Lymnaea elodes (Florin et al, 2000), B. glabrata (Thomas & Benjamin, 1974), Bulinus truncatus (Bayomy & Joosse, 1987), and P.…”

Section: Discussionmentioning

confidence: 79%

The effect of mating on female reproduction across hermaphroditic freshwater snails

Swart

Starkloff

Ypenburg

et al. 2020

Invertebrate Biology

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Sexual conflicts often arise between mating partners because each sex tries to maximize its own reproductive success. One major male strategy to influence a partner's resource allocation is the transfer of accessory gland proteins. This has been shown to occur in simultaneous hermaphrodites as well as in organisms with separate sexes. Although accessory gland proteins affect the investment of resources in both male and female function, we here specifically focus on female investment. In the great pond snail, Lymnaea stagnalis, previous studies found that the accessory gland protein ovipostatin reduced female fecundity by suppressing egg laying in the partner in the short term (days). To investigate whether this reduction in egg laying is a commonly found effect of mating in freshwater snails, we compared egg output for evidence of suppression in isolated and paired snails of eight pulmonate species. Furthermore, we determined whether the suppression of egg laying caused a shift in resource allocation to the eggs. We found that in five of the eight species egg laying was suppressed, with fewer and lighter egg masses being laid when they had access to a mating partner. In mated pairs of L. stagnalis and Biomphalaria alexandrina, allocation of resources to the eggs was altered in opposite ways: individuals of L. stagnalis laid fewer but larger and heavier eggs; individuals of B. alexandrina laid smaller and lighter eggs, with no change in egg numbers. Such changes in the female function are most likely the result of combined effects of receiving accessory gland proteins, and the cost of mating in both male and female roles. Thus, effects of the maternal environment, including the receipt of accessory gland proteins, on offspring investment are not restricted to species with separate sexes.

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Section: Discussionmentioning

confidence: 79%

The effect of mating on female reproduction across hermaphroditic freshwater snails

Swart

Starkloff

Ypenburg

et al. 2020

Invertebrate Biology

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“…Detecting the presence of other conspecifics, presum ably by some w ater-borne chemical com m unication, is known to influence feeding, growth, metabolism and repro duction in B. glabrata (C hernin & Michelson 1957;R itchie al. 1966;Thom as 1973;Thom as & Benjam in 1973, 1974Thom as et al 1975). M y results suggest that paired and control snails have a high reproductive outp u t because having another conspecific in the w ater stimulates gam ete production or enhances egg de velopm ent or hatching success in some way.…”

Section: (B) Effects O F Population and Treatment On Reproductive Outputmentioning

confidence: 96%

Low reproductive output of isolated, self-fertilizing snails: inbreeding depression or absence of social facilitation?

Vernon

1995

Proc. R. Soc. Lond. B

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Inbreeding depression has been studied extensively in m any anim als, but the potential of 'social facilitation' (a response to the presence of conspecifics in the environm ent) to influence reproduction has received little attention. Studies of reproductive o u tp u t in freshw ater herm aphrodite snails have im plicated inbreeding depression, but never social facilitation, in the reduced reproductive o utput of isolated com pared with p aired /g ro u p ed snails. In this experim ent, isolated, self-fertilizing Biomphalaria glabrata snails had reduced reproductive o u tp u t com pared with paired, predom inantly cross-fertilizing snails. However, the reproductive outp u t of control snails (paired, but prevented from cross-fertilizing) was sim ilar to th at of paired, cross-fertilizing snails, suggesting th at the low reproductive outp u t of snails in isolation was not simply due to inbreeding depression with self-fertilization. I suggest th at an absence of social facilitation, caused by deprivation of social com m unication as a result of isolation, m ay play a role in reducing reproductive o utput of isolated B. glabrata, and th at future studies of inbreeding depression using isolated and p aired /g ro u p ed herm aphrodite snails should be designed to control for possible effects of social facilitation.

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“…the response of selfing individuals to the presence of conspecifics in the environment) in a freshwater snail. Detecting the presence of other conspecifics, presumably by some water-borne chemical communication, is known to influence feeding, growth, metabolism and reproduction in freshwater snails (Ritchie et al 1966, Thomas and Benjamin 1973, 1974, Thomas et al 1975. Vernon (1995) found that isolated, self-fertilizing individuals of Biomphalaria glabrata had a reduced reproductive output compared with paired, predominantly cross-fertilizing snails.…”

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confidence: 99%

Social facilitation affects longevity and lifetime reproductive success in a self‐fertilizing land snail

Baur

Baur²

2000

Oikos

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Factors that reduce the reproductive output of self‐fertilizing hermaphrodites are receiving increasing attention. The combined effects of reduced fecundity of selfing parents and inbreeding depression of the progeny have been referred to as self‐fertilization depression. In isolated freshwater snails the reproductive output of selfing individuals also decreases due to the lack of social facilitation (absence of a conspecific). We examined the effect of social facilitation on lifetime reproductive success (number of young produced and longevity) over two generations in the simultaneously hermaphroditic land snail Balea perversa. In a parallel study we showed that B. perversa kept singly and in pairs reproduced exclusively by self‐fertilization. In the parent generation, snails kept singly produced less offspring than snails kept in pairs. The difference in lifetime number of young was mainly due to differences in adult life span. Snails of the two groups did not differ in reproductive rate (number of young produced per 100 d of reproductive life) and hatchling size. In the offspring generation, snails kept singly did not differ from individuals kept in pairs in the lifetime number of young and hatchling survival. As in the parent generation, snails kept singly reproduced during a shorter period than snails kept in pairs. However, the shorter reproductive life span of snails kept singly was compensated for by a slightly (but not significantly) higher reproductive rate which resulted in a similar number of offspring produced for both groups. In both generations, snails of the two groups did not differ in size at first reproduction, adult growth rate and size at death. These findings suggest that social facilitation may affect longevity in selfing B. perversa.

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Effects of Numbers, Biomass and Conditioning Time on the Growth and Natality Rates of Biomphalaria glabrata (Say) the Snail Host of Schistosom mansoni Sambon

Cited by 10 publications

References 0 publications

The effect of mating on female reproduction across hermaphroditic freshwater snails

The effect of mating on female reproduction across hermaphroditic freshwater snails

Low reproductive output of isolated, self-fertilizing snails: inbreeding depression or absence of social facilitation?

Social facilitation affects longevity and lifetime reproductive success in a self‐fertilizing land snail

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