Desiccation resistance among clones in the invading parthenogenetic cockroach, <i>Pycnoscelus surinamensis</i>: A search for the general‐purpose genotype

Parker, E. Davis; Niklasson, Monica

doi:10.1046/j.1420-9101.1995.8030331.x

Cited by 18 publications

(18 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These results seem to support the hypothesis that one or a few generalist euryaline genotypes ('general purpose genotype') exist that allow individuals of D. stevensoni, which apparently have identical or very similar genotypes, to exploit habitats with a wide range of salinity (Weider, 1993;Parker & Niklasson, 1995;Jaenike & Dombeck, 1998). Evidence of a marked salinity tolerance is important for paleoecological investigations such as the occurrence of Darwinula in the hypersaline habitats of the Early Triassic (Carbonel et al, 1988).…”

Section: Discussionsupporting

confidence: 62%

Salinity tolerance ofDarwinula stevensoni(Crustacea, Ostracoda)

Gandolfi

Todeschi

Doninck

et al. 2001

Italian Journal of Zoology

View full text Add to dashboard Cite

Relatively few laboratory tests of the effect of salinity on ostracod species exist. Here we report the results of acute and chronic bioassay tests to study the effects of six different salinities (deionised water, 22, 120, 922, 9600 μS-cm -1 , and marine water) on survival and reproductive parameters (number of eggs and hatching). The test was carried out on individuals of Darwinula stevensoni from different localities characterised by different salinity (from 111 μS-cm -1 at Monate, Italy, to 3440 μS-cm -1 at Hollandersgatkreek, Belgium). Individuals belonging to three life cycle stages were used (pre-adult, adult, ovigerous). Surprisingly low mortality was observed in all treatments and for all life stages, independently of population of provenance. Only in marine water was mortality noticeable although reproductive parameters were hardly affected. Given the high genetic homogeneity of the species, our results seem to support the hypothesis of high phenotypic plasticity for salinity tolerance in D. stevensoni.

show abstract

Section: Discussionsupporting

confidence: 62%

Salinity tolerance ofDarwinula stevensoni(Crustacea, Ostracoda)

Gandolfi

Todeschi

Doninck

et al. 2001

Italian Journal of Zoology

View full text Add to dashboard Cite

show abstract

“…These results and previous observations (Roth andWillis, 1960, 1961) do not completely support the statement of Parker and Niklasson ( 1995) that parthenogenesis can explain the wide distribution of P. surinamensis (compared to the narrow distribution of bisexual P. in&us). The first obvious explanation of the geographic distribution of P. surinamensis appears to be its transport by man (probably on vegetable mould carried with cultivated plants).…”

Section: Discussioncontrasting

confidence: 90%

The invading parthenogenetic cockroach: a natural history comment on Parker and Niklasson's study

Grandcolas¹,

Déjean²,

Deleporte³

1996

J of Evolutionary Biology

View full text Add to dashboard Cite

“…We thus test the tolerance and response of different populations of D. stevensoni to a wide range of salinities and temperatures. Stress tolerance across environments, measured as survival and mobility, is an indicator of fitness, which agrees well with the definition of GPG (Niklasson 1995).…”

Section: Introductionsupporting

confidence: 75%

“…The result is erosion of clonal diversity. A number of experimental tests of the existence of GPGs within asexual-sexual complexes have been conducted (Bierzychudek 1989;Weider 1993;Parker and Niklasson 1995;Kenny 1996;Semlitsch et al 1997;Browne and Wanigasekera 2000). The resulting data are contradictory, which is why no final conclusions has been drawn.…”

Section: Introductionmentioning

confidence: 99%

“…As a consequence of this high clonal diversity, habitats are more likely to be occupied by differentially adapted clones rather than by a single highly generalised (or GPG) clone (Parker et al 1977;Vrijenhoek 1979;Harshman and Futuyma 1985;Innes and Hebert 1988;Fox et al 1996). This may explain why most studies on geographic parthenogenesis fail to demonstrate the existence of a genuine GPG in asexuals (Weider 1993;Parker and Niklasson 1995;Fox et al 1996;Kenny 1996;Semlitsch et al 1997;Browne and Wanigasekera 2000). Therefore, looking for a GPG in geographic parthenogenesis seems to be based on an erroneous assumption.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A general purpose genotype in an ancient asexual

et al. 2002

View full text Add to dashboard Cite

Many parthenogenetic species are geographically more widely distributed than their sexual relatives. Their success has been partly attributed to the existence of general purpose genotypes (GPGs). Darwinula stevensoni is an ostracod species, which has persisted for >25 million years without sex, and is both ubiquitous and cosmopolitan. Here, we test the hypothesis that this ancient asexual species may possess a highly generalised (or general purpose) genotype. The ecological tolerance of D. stevensoni was compared with asexual populations of Heterocypris incongruens, a common cypridinid species with mixed reproduction, as well as with that of another ancient asexual darwinulid species with a limited geographic and ecological distribution, Vestalenula molopoensis. The unusually wide tolerance range for both salinity (0-30 g/l) and temperature (10°C, 20°C and 30°C) of the freshwater species D. stevensoni, supports the hypothesis that this ancient asexual has indeed developed a GPG. This coincides with its wide geographic and ecological distribution and might explain its persistence as an obligate asexual in its long-term evolution. The more restricted salinity tolerance of V. molopoensis (maximum at 12 g/l) shows that not all species of the ancient asexual family Darwinulidae have a GPG. D. stevensoni has a much broader tolerance than the asexuals of H. incongruens. We argue why a GPG is most likely to develop in long-term asexuals.

show abstract

Desiccation resistance among clones in the invading parthenogenetic cockroach, Pycnoscelus surinamensis: A search for the general‐purpose genotype

Cited by 18 publications

References 2 publications

Salinity tolerance ofDarwinula stevensoni(Crustacea, Ostracoda)

Salinity tolerance ofDarwinula stevensoni(Crustacea, Ostracoda)

The invading parthenogenetic cockroach: a natural history comment on Parker and Niklasson's study

A general purpose genotype in an ancient asexual

Contact Info

Product

Resources

About