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  • anhydrobiosis  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Stress during dormancy: effect on recovery rates and life-history traits of anhydrobiotic animals (1998)
    Springer
    Aquatic ecology 32 (1998), S. 353-359 
    Details
    ISSN: 1573-5125
    Keywords: anhydrobiosis ; bdelloid rotifers ; fecundity ; nematodes ; shuttle flight ; survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To test the influence of storage conditions on recovery and life-history traits of dormant animals we subjected cohorts of a bdelloid rotifer (Macrotrachela quadricornifera) and a nematode (Panagrolaimus rigidus) to three different conditions during a 26-d anhydrobiosis period. These conditions were (1) standard conditions in our laboratory (AC), (2) a flight to the U.S.A. and storage there (KSC), and (3) a flight to the U.S.A. followed by a flight on a Shuttle-to-Mir mission (Shuttle). Another cohort (HC) was maintained under hydrated conditions and served as reference for life-history traits of the desiccated samples. The recovery after dormancy and the residual life-history traits of the different cohorts were compared. Results indicate that (a) during dormancy the animals were indifferent to the test conditions, as evidenced from both recovery capacity and life history performances, (b) the anhydrobiotic period affected the experimental species differently. At recovery both animals resumed their life cycle, but while the rotifer appeared indifferent to the time spent in desiccation, the nematode modified its life history according to the duration of anhydrobiosis. Third, (c) induction of anhydrobiosis can act as a switching mechanism for animals capable of desiccation. Anhydrobiosis probably represents a suitable method to preserve organisms during stressful conditions allowing them to return to a normal life when convenient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009905404868
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  • 2
    Electronic Resource
    Electronic Resource
    Desiccation of Panagrolaimus rigidus (Nematoda): survival, reproduction and the influence on the internal clock (1997)
    Springer
    Hydrobiologia 347 (1997), S. 1-13 
    Details
    ISSN: 1573-5117
    Keywords: nematode ; desiccation ; life cycle ; anhydrobiosis ; fecundity ; recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Following the life-table experimental schedule, cohorts of aparthenogenetic strain of the free-living nematode Panagrolaimus rigidus were desiccated for six days at theages of4, 8, 12, and 19 d (age effect) and cohorts aged 8 d weredried for15, 20, 40, and 60 days (time effect) to determine theirability torecover and to reproduce.Nematode age had poor effect on recovery after 6 days ofdesiccation until the mean longevity of the nematode (19 daysinhydrated medium) is approached, while increasing times ofdesiccation (from 6 to 60 d) remarkably decreased capacity forrecovery (from 80 to 8%). Anhydrobiosis experienced atdifferentages or for different durations modified the timing of thenematodelife cycle events, but not the pattern of age-specificfecunditynor survival curves. The age-specific fecundity is largelyretainedfollowing anhydrobiosis, but when matched to that of thenematodeskept hydrated (controls), it declines for increasing durationsofdesiccation. Anhydrobiosis appears to cause a reset of theanimal‘sinternal clock, that is dependent on the duration ofdesiccation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002979522816
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  • 3
    Electronic Resource
    Electronic Resource
    Ecology of bdelloids: how to be successful (1987)
    Springer
    Hydrobiologia 147 (1987), S. 117-127 
    Details
    ISSN: 1573-5117
    Keywords: bdelloids ; rotifers ; biogeography ; ecology ; parthenogenesis ; anhydrobiosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Bdelloids inhabit many different environments. The entire taxon is an order belonging to the phylum Rotifera. In spite of its wide distribution, it has a very uniform morphology, suggesting that natural selection has had almost no effect on its morphological characteristics. This paper reviews the geographical and ecological distributions of bdelloids and their ability to tolerate different conditions is discussed. Two characteristics account for the wide distribution of bdelloids, parthenogenetic reproduction and their ability to withstand unfavorable conditions through anhydrobiosis. The former is an apomictic thelytoky which may ensure genetic homogeneity within clones. However, evidence which suggests variability among and within parthenogenetic clones is discussed. Some recent experimental evidence indicates that anhydrobiosis does not affect the life history of the surviving individuals. The effects of anhydrobiosis on bdelloid populations are considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00025734
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  • 4
    Electronic Resource
    Electronic Resource
    Anhydrobiotic capabilities of bdelloid rotifers (1998)
    Springer
    Hydrobiologia 287-388 (1998), S. 321-326 
    Details
    ISSN: 1573-5117
    Keywords: bdelloid rotifers ; anhydrobiosis ; desiccation ; recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To test if anhydrobiotic capability is apomorphic to class Bdelloidea, I focused on the recovery from desiccation of 15 bdelloid species. The species belonged to 6 genera, represented the four bdelloid families, and were collected from water and moss environments. Eggs or embryos, prereproductive and reproductive specimens of most species were desiccated and kept dry for 7 days. The highest recovery rates were obtained rehydrating adult bdelloids of moss species, while three aquatic species did not survive anhydrobiosis. Species from aquatic and moss habitats differed in their capacity to enter anhydrobiosis and to recover successfully. This difference may be related to the different desiccation frequencies of the two habitats, although aquatic species were able to survive desiccation. It seems likely that anhydrobiotic capacity is a feature common to all bdelloids, and that was subsequently lost by some species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017086425934
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  • 5
    Electronic Resource
    Electronic Resource
    Anhydrobiotic capabilities of bdelloid rotifers (1998)
    Springer
    Hydrobiologia 387-388 (1998), S. 321-326 
    Details
    ISSN: 1573-5117
    Keywords: bdelloid rotifers ; anhydrobiosis ; desiccation ; recovery
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To test if anhydrobiotic capability is apomorphic to class Bdelloidea, I focused on the recovery from desiccation of 15 bdelloid species. The species belonged to 6 genera, represented the four bdelloid families, and were collected from water and moss environments. Eggs or embryos, prereproductive and reproductive specimens of most species were desiccated and kept dry for 7 days. The highest recovery rates were obtained rehydrating adult bdelloids of moss species, while three aquatic species did not survive anhydrobiosis. Species from aquatic and moss habitats differed in their capacity to enter anhydrobiosis and to recover successfully. This difference may be related to the different desiccation frequencies of the two habitats, although aquatic species were able to survive desiccation. It seems likely that anhydrobiotic capacity is a feature common to all bdelloids, and that was subsequently lost by some species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1017086425934
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    Paper (German National Licenses)
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