A study of enzyme polymorphism in the antarctic amphipod Paramoera walkeri Stebbing

Patarnello, Tomaso; Bisol, Paolo Maria; Varotto, Vittorio; Fuser, V.; Battaglia, B.

doi:10.1007/bf00233697

Cited by 4 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This led Fevolden to conclude that Iceland scallops represent an exception of high heterozygosity in cold polar environments. In the Antarctic, Patarnello et al (1990) found very low average heterozygosity of 0.6% and 0.7% in 22 investigated gene loci of two amphipods, supporting the idea that homozygous ''specialists" with higher metabolic efficiency through cold adapted proteins/genes/alleles are selected under Antarctic conditions. However, given the scarcity of data in the Antarctic, as well as the variability in methods, numbers and nature of genes in the available data sets, it seems that any conclusion would be preliminary and, again, opens the field for future research.…”

Section: Genes and Lifespan In Bivalvesmentioning

confidence: 61%

“…The Antarctic circumpolar current forms a barrier that reduces gene flow and genetically isolates the stenothermal Antarctic molluscs (Patarnello et al, 1990). Many Antarctic species are endemic and have optimized their ecology and physiology at constant low water temperature, with low flexibility and tolerance to environmental fluctuation.…”

Section: Genes and Lifespan In Bivalvesmentioning

confidence: 99%

See 1 more Smart Citation

Bivalve models of aging and the determination of molluscan lifespans

Abele

Brey

Philipp

2009

Experimental Gerontology

133

View full text Add to dashboard Cite

a b s t r a c tBivalves are newly discovered models of natural aging. This invertebrate group includes species with the longest metazoan lifespan approaching 400 y, as well as species of swimming and sessile lifestyles that live just for 1 y. Bivalves from natural populations can be aged by shell growth bands formed at regular intervals of time. This enables the study of abiotic and biotic environment factors (temperature, salinity, predator and physical disturbance) on senescence and fitness in natural populations, and distinguishes the impact of extrinsic effectors from intrinsic (genetic) determinants of animal aging. Extreme longevity of some bivalve models may help to analyze general metabolic strategies thought to be life prolonging, like the transient depression of metabolism, which forms part of natural behaviour in these species. Thus, seasonal food shortage experienced by benthic filter feeding bivalves in polar and temperate seas may mimic caloric restriction in vertebrates. Incidence of malignant neoplasms in bivalves needs to be investigated, to determine the implication of late acting mutations for bivalve longevity. Finally, bivalves are applicable models for testing the implication of heterozygosity of multiple genes for physiological tolerance, adaptability (heterozygote superiority), and life expectancy.Ó 2009 Elsevier Inc. All rights reserved. Bivalves: a diverse set of models for aging studies and environmental recordersCommonly used animal models for cellular and molecular mechanisms underlying the process of aging, such as Drosophila melanogaster, Caenorhabditis elegans or small rodents, are bred and reared under controlled laboratory conditions. Most of these aging models are short lived (days in C. elegans, weeks in D. melanogaster, <5 y in rodents) and, hence, may not show all the age-dependent changes of long-lived species (Reznik, 1993;Kirkwood, 2002). Especially, short lived models are not representative of the negligible aging type (Finch, 1990;Terzibasi et al., 2007). Further, aging under controlled laboratory conditions may differ significantly from aging in the wild, and the applicability of the results to natural animal populations is often questionable. Good reasons to establish animal models that can be sampled from a range of environmental settings and scenarios, but at the same time provide information on their individual life history, including their chronological age (Austad, 1996).Such new models are found among bivalve molluscs. Worldwide, approximately 20,000 species (Pearse et al., 1987) of marine bivalves exist so that this class offers a rich diversity of lifestyles, adaptations to specific environmental conditions and corresponding strategies of aging, albeit based on the same filter feeder blueprint in the majority of species. Some bivalve species, like the long-lived ocean quahog, Arctica islandica or the blue mussel Mytilus edulis exhibit broad geographical distribution, with habitats spanning large latitudinal ranges and covering different climate zones. Other sp...

show abstract

Section: Genes and Lifespan In Bivalvesmentioning

confidence: 61%

Section: Genes and Lifespan In Bivalvesmentioning

confidence: 99%

Bivalve models of aging and the determination of molluscan lifespans

Abele

Brey

Philipp

2009

Experimental Gerontology

133

View full text Add to dashboard Cite

show abstract

Size distribution of the amphipod Paramoera walkeri (Stebbing) along a depth gradient in Antarctica

1996

View full text Add to dashboard Cite

Body weight distributions of the amphipod Paramoera walkeri colonizing litter-bags at different depths (2, 5, and 10 m) in Terra Nova Bay were compared. This species dominated the vagile benthic community and was found nearly alone at the shallow sites. At the deepest site it co-occurred with two smaller benthic species (the gastropod Laevilitorina antarctica and the isopod Munna antarctica) but still accounted for most of the animal biomass (80.2%). The frequency size-class distributions of the three dominant species were sharply distinct in a condition of stable coexistence. The total biomass was inversely related to the abundance of animals and diminished with increasing depth. Both species and size-class diversities were higher in deep water which offered a more diversified and favourable habitat than shallow water. At the shallow sites only the large size classes of P. walkeri were present. Differences in the mean individual ash content between samples support the hypothesis that different size individuals of P. walkeri segregated along the depth gradient on the basis of their metabolic requirements and the related ability to exploit sub-optimal environments

show abstract

Genetic differentiation between spatially-disjunct populations of the deep-sea, hydrothermal vent-endemic amphipod Ventiella sulfuris

Hessler

Vrijenhoek

1992

Marine Biology

View full text Add to dashboard Cite

A study of enzyme polymorphism in the antarctic amphipod Paramoera walkeri Stebbing

Cited by 4 publications

References 13 publications

Bivalve models of aging and the determination of molluscan lifespans

Bivalve models of aging and the determination of molluscan lifespans

Size distribution of the amphipod Paramoera walkeri (Stebbing) along a depth gradient in Antarctica

Genetic differentiation between spatially-disjunct populations of the deep-sea, hydrothermal vent-endemic amphipod Ventiella sulfuris

Contact Info

Product

Resources

About