Über den bau und die entwicklung der bruttaschen von sphaerium rivicola LM

Groenewegen, J. A. W.

doi:10.1007/bf00408029

Cited by 10 publications

(8 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The presence of brood pouches formed by filaments of the inner demibranch is a peculiar feature of the subfamily Sphaeriinae. Similarity in the details of the histological structure (Groenewegen 1926; Okada 1937; Meier‐Brook 1970; Hetzel 1993), confirms the homology of these pouches within the group. States: 0, absent; 1, present. Number of filaments in the pouch.…”

Section: Methodsmentioning

confidence: 57%

“…States: 0, planktotrophic; 1, lecithotrophic (ovo‐viviparity); 2, nutrition provided by the parental animal (eu‐viviparity). Simultaneous development of several broods (asynchronous brooding). The presence of this feature in Sphaerium and Musculium , in contrast to Pisidium , has been know for some time (Groenewegen 1926; Okada 1937); the term ‘asynchronous brooding’ is used in the sense of Heard (1977). Ituarte (1984) described the same mode of breeding in Neocorbicula .…”

Section: Methodsmentioning

confidence: 99%

“…States: 0, absent; 1, present. Number of filaments in the pouch. In comparison with Sphaerium and Musculium , the brood pouches of Pisidium are characterized by a larger number of filaments involved (Groenewegen 1926; Meier‐Brook 1970; Mackie et al . 1974).…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Phylogenetic analysis based on the morphology of viviparous freshwater clams of the family Sphaeriidae (Mollusca, Bivalvia, Veneroida)

Korniushin

Glaubrecht

2002

Zoologica Scripta

View full text Add to dashboard Cite

415Korniushin, A. V. & Glaubrecht, M. (2002). Phylogenetic analysis based on the morphology of viviparous freshwater clams of the family Sphaeriidae (Mollusca, Bivalvia, Veneroida).-Zoologica Scripta , 31 , 415 -459. The cosmopolitan viviparous bivalves of the family Sphaeriidae (fingernail clams) comprise not only some of the smallest freshwater molluscs, but also an abundant and ecologically important group that often dominates benthic communities of springs, ponds and swamps. The origin from marine ancestors and their subsequent evolution in limnic environments, in particular the development of distinct reproductive modes including complex parental care repertoires, are largely unresolved. This paper presents the results of a phylogenetic analysis of 69 morphological characters from 57 taxa (54 representing sphaeriids throughout the distribution area plus three outgroups). The heuristic search resulted in 753 most-parsimonious trees of length 154 [consistency index (CI) = 0.682, retention index (RI) = 0.906, rescaled consistency index (RC) = 0.618]. Only Pisidium of the three traditionally regarded constituent genera is supported as a monophyletic group; Sphaerium and Musculium in their traditional deliminations are found to be paraphyletic. Instead, the analysis supports a clade comprising all species of Musculium plus Pisidium as suggested by previous morphology-based classifications. However, the shortest tree alternatively supporting a Sphaerium + Musculium clade suggested by molecular data is only one step longer. Some clades that correspond to the subgeneric divisions of the three traditionally recognized sphaeriid genera are supported. Exclusion is suggested of the taxon Euperidae ( Eupera and Byssodonta , both with ovo-viviparous species) from the true Sphaeriidae that then comprises all species with eu-viviparous reproductive mode, i.e. brooding and nourishing their embryos in specialized brood pouches in the gills. The implications for the reconstruction of the evolutionary history of Sphaeriidae and the availability of existing taxonomic names for the systematization suggested by the present analysis are discussed.

show abstract

Section: Methodsmentioning

confidence: 57%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Phylogenetic analysis based on the morphology of viviparous freshwater clams of the family Sphaeriidae (Mollusca, Bivalvia, Veneroida)

Korniushin

Glaubrecht

2002

Zoologica Scripta

View full text Add to dashboard Cite

show abstract

“…Among freshwater mollucs, it only occurs in Sphaeriid bivalves and Vivipariid gastropods. In the marsupial sacs the developing embryos presumably derive nutrition from the adult (Poyarkoff, I9Io;Groenewegen, 1926;and Okada, 1935b). Adults may also provide a relatively stabilized 'internal environment' for the young, since the young are vunerable to irregular environmental fluctuations and predation.…”

Section: Discussionmentioning

confidence: 99%

Biomass turnover in populations of viviparous sphaeriid clams: Comparisons of growth, fecundity, mortality and biomass production

Avolizi

1976

Hydrobiologia

View full text Add to dashboard Cite

This paper reports studies carried out on natural populations of two species of viviparous clams, Sphaerium striatinum and S. simile, at three localities in two mesotrophic lakes in upstate New York. Sphaeriids are dominant members of the benthic fauna at the second trophic level in these localities, and more generally are cosmopolitan and ubiquitous animals.A growth survey involved monthly collections of regular samples, and these were used in measurements of growth, fecundity, mortality, and biomass production. S. striatinum proved to have an 18 to 24 month lifespan and S. simile one of about 26 months. Differences in reproduction included a maximum brood size of 12 in S. striatinum and of only 6 in S. simile, spat recruitment extending over 8 months in S. striatinum and over 9 months in S. simile, and a mean spat size at birth of 3.6 mm in S. striatinum and 6.4 mm in S. simile. The gross fecundity is thus markedly lower than that in the majority of molluscs. Mortality is to some extent compensating, adult survivorship being greater in S. simile, but mortality rates are remarkably steady and relatively low in both species. Field assessments of density showed that S. striatinum was dominant in one locality, and S. simile in another locality in the same lake, but that S. striatinum occurred at greater densities than any other sphaeriid species.Cage experiments confirmed the steady mortality rates and low fecundity values for these sphaeriids. Individual growth rates in cages are considerably higher than the mean values from population samples, since growth rates there are not obscured by recruitment of spat.A more complete analysis of growth in both species involved a series of over 400 determinations of total nitrogen (by microDumas). These were utilized in computations of productivity. Embryonic production makes up only a small fraction (< o per cent) of the biomass turnover in these viviparous sphaeriids. The overall annual productivity (in terms of total nitrogen) is o.8 Dr. W. Junk b.v. Publishers -The Hague, The Netherlands grams nitrogen per square meter per year for S. striatinum and only o.28 grams nitrogen per square meter per year for S. simile.In a discussion of these figures they are shown to correspond to about 33 per cent of the second trophic level productivity for S. striatinum and about o per cent for S. simile. Since sphaeriids are long-lived, these percentages reflect a real dominance. In further discussion of the 'coexistence of these two species', it is pointed out that mortality is higher for the less common species in each locality.

show abstract

“…Mode of embryo nourishment has been investigated (Poyarkoff, T910;Schereschewsky, 1911;Gilmore, 1917;Groenewegen, 1926;Okada, 1935 The function and structure of the filament is unknown.…”

Section: Food Habitsmentioning

confidence: 99%

Bottom fauna of Pool 19, Mississippi River with emphasis on the life history of the fingernail clam, Sphaerium transversum

Gale

View full text Add to dashboard Cite

Über den bau und die entwicklung der bruttaschen von sphaerium rivicola LM

Cited by 10 publications

References 6 publications

Phylogenetic analysis based on the morphology of viviparous freshwater clams of the family Sphaeriidae (Mollusca, Bivalvia, Veneroida)

Phylogenetic analysis based on the morphology of viviparous freshwater clams of the family Sphaeriidae (Mollusca, Bivalvia, Veneroida)

Biomass turnover in populations of viviparous sphaeriid clams: Comparisons of growth, fecundity, mortality and biomass production

Bottom fauna of Pool 19, Mississippi River with emphasis on the life history of the fingernail clam, Sphaerium transversum

Contact Info

Product

Resources

About