Molluscan shell growth and loss

Downing, William L.; Downing, John A.

doi:10.1038/362506a0

Cited by 31 publications

(20 citation statements)

References 6 publications

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Section: Discussionmentioning

confidence: 98%

“…Downing and Downing (1993) reported that lentic unionoid species (Anodonta grandis grandis and Lampsilis radiata siliquoidea) inhabiting soft muddy substrate shrunk (i.e., negative growth) in winter in an oligotrophic lake (see also Downing et al 1992). This shrinkage was not attributed to exterior shell erosion but to dissolution of shell margin (Lutz and Rhoads 1977;Downing and Downing 1993). In contrast, Haag and Commens-Carson (2008) rigorously examined the process of growth ring formation, concluding that growth loss was better explained by chronic growth interruption and shell margin damages associated with repeated handling.…”

Section: Discussionmentioning

confidence: 98%

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Size‐specific growth patterns and estimated longevity of the unionid mussel (Pronodularia japanensis)

Negishi

Kayaba

2009

Ecological Research

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Despite the dwindling populations and an urgent need for conservation of unionid freshwater mussels in Japan, there are gaps in our understating of their fundamental ecology. This study examined size-dependent annual growth rates, elucidated size-specific intraannual growth patterns, and estimated age and longevity of P. japanensis individuals for two locally isolated populations in agricultural drainage channels. Annual growth rates of P. japanensis were strongly size-dependent, with growth rates being exponentially decelerated with increasing shell length. Irrespective of sizes, individuals ceased to grow in winter when water temperature fell below 10°C. Intra-annual growth patterns were weakly explained by the changes in water temperature and differed among size classes; juveniles (<25 mm) maximized growth rate in May whereas the growth rates were the highest in June or July for larger individuals. Only adult individuals exhibited growth cessation in the July-August period, suggesting that energy investment was directed towards reproductive activities. Adults also showed negative growth rates (shrinkage of individuals) in winter, suggesting possible dissolution of shell margins. Age estimation based on two 1-year periods suggests that large numbers of P. japanensis individuals were >10 years old, and the oldest individuals were >20 years old for both study populations. Our findings suggest that anthropogenic activities conducted in spring may have strong influences on juveniles and population dynamics of P. japanensis and underscore the need for accurately determining age and longevity of remaining populations of unionid mussels.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 98%

Size‐specific growth patterns and estimated longevity of the unionid mussel (Pronodularia japanensis)

Negishi

Kayaba

2009

Ecological Research

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“…It has been suggested that other kinds of disturbances than seasonal vanations may affect shell formation and cause similar structures (Orton 1923, Haskin 1954. In freshwater bivalves, recent results indicate that shell size may even decrease (Downing & Downing 1993). Second, defining a distinct growth ring is to some extent a subjective process, which may cause different results between readings by the Same person and, even more likely, those by different persons.…”

Section: Methodsmentioning

confidence: 93%

Analysis of the spatial variability in abundance and age structure of two infaunal bivalves, Cerasto-derma edule and C. lamarcki, using hierarchical sampling programs

Lindegarth¹,

Andre²,

Jonsson³

1995

Mar. Ecol. Prog. Ser.

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Spatial variability in abundance and age distnbution of 2 infaunal bivalves, Cerastoderma edule (Linnaeus, 1785) and C. lamarcki (Reeve, 1845), were quantified using hierarchical sampling programs. The scales investigated ranged between 10' and 10' m. Analyses of variance revealed significant vanability in abundance among sites within bays (-100 m apart) for both species and also among bays (-1 km apart) for C. lamarcki. Mean age vaned at several spatiai scales. For both species, however, the scale contributing most to the variation was bays, which provided about 40 % of the total vanation for each species. Randomization procedures were used to test the generality of previous observations of non-random distributions of year classes (namely number of year classes and dorninance by Single year classes). These analyses showed that for both species a spatial unit contained significantly fewer year classes and the most abundant year class was significantly more abundant than expected by chance. These results were consistent for ali spatiai scales except among plots (-10' m apart) in C. lamarcki. The necessity to assess spatial patterns at a wide range of spatial scales is emphasized. Potentially important processes (focusing on larval supply and recruitment) which generate the observed patterns and general implications of spatial vanability are discussed.

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“…Mollusks can lose soft tissue mass due to spawning (Bayne & Worrall 1980, Rodhouse et al 1984a or to low food conditions (e.g. Bayne & Newell 1983), while negative shell growth in marine mollusks has not been reported (but see Downing & Downing 1993, for a freshwater mussel example). The soft tissue/shell mass ratio was examined for differences among the food/density levels between October 1995 and 1996.…”

Section: Shell Mass Growth and Comparison With Soft Tissue Growthmentioning

confidence: 99%

Shell allometry and length-mass-density relationship for Mytilus edulis in an experimental food-regulated situation

Alunno‐Bruscia¹,

Bourget²,

Fréchette³

2001

Mar. Ecol. Prog. Ser.

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We examined the influence of food availability and population density on the morphometry and shell length body mass relationship of Mytilus edulis. Mussels were reared in the laboratory for 22 mo at 8 different density levels in 1 l chambers supplied with natural seston at 2 different concentrations. This allowed us to assess separately the effects of food availability and mussel density. The shell length/width and shell height/width ratios were affected by food, density and time. Mussels tended to be narrower (flatter) at high density and at low food level. Therefore, narrow shells could result from reduced food concentration in high density situations without implying physical interference. Shell mass was also influenced by both food and density levels, but to a lesser extent than tissue dry mass. In contrast with soft tissue mass, shell mass increased significantly for all food and density levels between October 1995 and October 1996. The elevation of the shell length-body mass-population density relationship was lower at low food availability. The slope of the tridimensional relationship, however, increased with decreasing food level, indicating apparent asymmetric competition for all food-density treatments pooled together. This pattern, however, is misleading because mussels obviously cannot interact among chambers. Since the slopes of length mass relationships are used in predicting self-thinning exponents in space-regulated situations, it follows that self-thinning exponents in mussels should be sensitive to background food level, thus limiting the use of self-thinning relationships for resolving factors regulating growth.KEY WORDS: Mussels · Shell allometry · Food regulation · Length-mass-density relationship · m-N curve Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 219: [177][178][179][180][181][182][183][184][185][186][187][188] 2001 one of the most important roles in Mytilus edulis (Seed 1968, 1973, Brown et al. 1976). High population density has generally been reported to lead to elongated shells in mussels (Coe 1946, Lent 1967, Brown et al. 1976, Richardson & Seed 1990, although extreme deformation may be observed in some cases (Bertness & Grosholz 1985). Individual shape is also affected by population density in oysters (Tanita & Kikuchi 1957, Chinzei et al. 1982, clams (Ohba 1956, Cigarria & Fernandez 1998 and tunicates (Paine & Suchanek 1983), for instance. Perhaps the most spectacular effect of high population density on individual shape in benthic suspension feeders is found in conspicuous hummocks formed by high-density barnacle populations (Bertness et al. 1998). Crowding is usually understood as implying physical interference. Manipulations of population density in some infaunal bivalves, however, have shown no evidence of physical interference (Peterson 1982). This is consistent with food depletion in dense bivalve beds and with individual growth being food regulated (Wildish & Kristmanson 1984, Fréchette & Bourget 1985a. The...

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Molluscan shell growth and loss

Cited by 31 publications

References 6 publications

Size‐specific growth patterns and estimated longevity of the unionid mussel (Pronodularia japanensis)

Size‐specific growth patterns and estimated longevity of the unionid mussel (Pronodularia japanensis)

Analysis of the spatial variability in abundance and age structure of two infaunal bivalves, Cerasto-derma edule and C. lamarcki, using hierarchical sampling programs

Shell allometry and length-mass-density relationship for Mytilus edulis in an experimental food-regulated situation

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