A Note on the Sex of Pseudanodonta Bourguignat and Anodonta Lamarck

Bloomer, Harlan

doi:10.1093/oxfordjournals.mollus.a064369

Cited by 8 publications

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“…As reviewed by Fretter and Graham (1964), the sexual state of a hermaphroditic species can be affected by both environmental and genetic factors. However, if environment is the single controlling factor, variations should be observed in the reproductive biology of isolated North American populations of C. fluminea, as has been reported for English populations of the freshwater unionid Anodonta cygenea (Bloomer, 1939). However, if environment is the single controlling factor, variations should be observed in the reproductive biology of isolated North American populations of C. fluminea, as has been reported for English populations of the freshwater unionid Anodonta cygenea (Bloomer, 1939).…”

Section: B Reproductive Biologymentioning

confidence: 74%

Ecology of an Invasive Pest Bivalve, Corbicula

McMahon

1983

Ecology

126

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Section: B Reproductive Biologymentioning

confidence: 74%

Ecology of an Invasive Pest Bivalve, Corbicula

McMahon

1983

Ecology

126

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“…Species-specific variations in lifehistory strategies, as for example with the North American Unionoidea (Van der Schalie, 1970;Heard, 1975) which display a variety of sexual strategies adapting them to their particular microhabitats, should also be expected. Downing et al (1 989) have demonstrated that Elliptio complanata is a protandrous, sequential hermaphrodite but also showed, as first noted for unionids by Bloomer (1939), that sexual expression is not species-specific but may be highly variable among populations. Morton (19874, working on an assemblage of Hong Kong fresh and brackish water bivalves, showed differences in life-history traits and sexual strategies which were equated with the concept of r and K selection (MacArthur & Wilson, 1967;Pianka, 1970) as applied to occupation of temporally unstable vs. stable habitats.…”

Section: Discussionmentioning

confidence: 98%

Do the Bivalvia demonstrate environment‐specific sexual strategies? A Hong Kong model

Morton

1991

Journal of Zoology

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The expression of sexuality, overall sex ratio and variation in sex ratio with age of 14 southern Chinese freshwater, brackish and marine bivalves have been investigated. Freshwater species are often hermaphroditic and brooding, e.g. Musculium and Pisidium (Pisidiidae), while Corbicula fluminea (Corbiculidae) demonstrates wide intraspecific variability in sexual expression, but also broods. Anodontu woodiunu (Unionidae) and Limnoperna fortunei (Mytilidae) are dioecious, with low incidence of hermaphrodites in the former, but both have strong female‐biased overall sex ratio which does not change with age. Juvenile age classes of Corbicula cf. fluminalis have female‐biased sex ratio. A pronounced female bias is means to optimize reproductive success, by maximizing resource allocation into more energy‐demanding oogenesis, in temporally and spatially heterogeneous lacustrine habitats. In such habitats, moreover, there are probably diminishing returns to producing sons. Mangrove and brackish water species are all dioecious (except Succostrea cuculluta) with slight male‐biased sex ratio overall, but are strongly male‐biased as juveniles. This strategy similarly optimizes success in fluctuating intertidal environment, where high rates of juvenile mortality may be expected possibly, for example, through enhanced predation. In such case, therefore, the greater investment in sons is prerequisite to an overall balanced sex ratio. The marine intertidal species, Perna ciridis (Mytilidae) and Donax semigranosus (Donacidae) have stable I:I sex ratio, notvvarying with age, and are representative of the ‘typical’ dioecious condition recorded for most marine bivalves. Thus, although intraspecific variations in life history tactics and sexual strategies equip all species for variable environment, it is postulated that permutations of the ‘dioecious’ condition, mediated through variations in the sex ratio either overall or with age, broadly equip the Bivalvia for the total range of aquatic habitats.

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“…aspects will be realized". For example, A. cygnea may be dioecious (gonochronistic) in running waters whereas hermaphroditic animals can exist in ponds (Wiesensee, 1916;Bloomer, 1939). This point is given added emphasis by the occurrence of a few hermaphrodites (0.3%) in the A. woodiana population (which otherwise comprised approximately 40% males and 60% females).…”

Section: Discussionmentioning

confidence: 99%

The population dynamics and sexual strategy of Anodonta woodiana (Bivalvia: Unionacea) in Plover Cove Reservoir, Hong Kong

Dudgeon

Morton

1983

Journal of Zoology

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A 12‐month investigation of the population dynamics, growth, ageing, reproduction and sexuality of Anodonta woodiana (Lea, 1834) in Plover Cove Reservoir, Hong Kong, has been undertaken. Recruitment occurs in the summer, May through July being the period of peak incidence of glochidia on captive fish hosts. Juveniles grow rapidly to a shell length of 30 mm and are sexually mature by the following spring. A study of the population structure of A. woodiana indicated that most animals were less than 8 years old. Results of a Walford plot for this species indicated a maximum theoretical shell length (in Plover Cove) of 162·5 mm and a life span of approximately 12 years; the latter is in good agreement with age estimates for European unionids. Anodonta woodiana is dioecious with females predominating in a ratio of 60:40. A very small number of individuals (0·3%) are hermaphrodite. Males possess mature gonads throughout the year whereas females come into reproductive condition during the spring. There was no evidence of shell form sexual dimorphism, as has been recorded for other unionaceans. The reproductive strategy and time of gonad maturation of A. woodiana is compared with that of unionids from elsewhere and with other fresh water bivalves from southern China.

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A Note on the Sex of Pseudanodonta Bourguignat and Anodonta Lamarck

Cited by 8 publications

References 0 publications

Ecology of an Invasive Pest Bivalve, Corbicula

Ecology of an Invasive Pest Bivalve, Corbicula

Do the Bivalvia demonstrate environment‐specific sexual strategies? A Hong Kong model

The population dynamics and sexual strategy of Anodonta woodiana (Bivalvia: Unionacea) in Plover Cove Reservoir, Hong Kong

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