Influence of temperature on form of the freshwater Copepod, <i>Cyclops vernalis Fischer</i>

Coker, R. E.

doi:10.1002/iroh.19340300303

Cited by 20 publications

(8 citation statements)

References 5 publications

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“…55,No.6 temperature effects, none can explain why other coexisting species fail to undergo simultaneous changes. Also, of the members of the zooplankton known to undergo seasonal egg-size changes (e.g., Coker 1934, Czeczuca 1960, and Deevey 1960Brooks 1946, in Daphnia), some produce larger eggs in the summer, others smaller. There is no consistent or simple association between egg size and density or temperature for sets of species.…”

Section: Discussionmentioning

confidence: 99%

Egg‐Size Cycle of a Cladoceran

Kerfoot¹

1974

Ecology

104

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The cladoceran Bosmina Longirostris undergoes a peculiar egg—size cycle in Frains Lake. Females carry small eggs during summer, then switch to large eggs in late fall, in the process more than doubling the enclosed yolk volume. Winter generations mature at larger sizes, then shift to small eggs in early spring. The fluctuations in egg size are not strongly associated with indirect measures of nutritional conditions. Rather, they seem part of a cycle that produces small young in one seasons, large young in another, primarily as a response to changing patterns of predation.

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Section: Discussionmentioning

confidence: 99%

Egg‐Size Cycle of a Cladoceran

Kerfoot¹

1974

Ecology

104

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“…The mean length of adult female copepods decreased from 1 .41 mm, August 15 to 1 .14 mm, September 22 and then increased to 1 .36, Novem- Coker (1934) found that in rearing the progeny of wild caught vernalis from the Paris area at various experimental temperatures spine counts of five occasionally appeared .…”

Section: Sizementioning

confidence: 94%

Esteval phenology of an Acanthocyclops (Crustacea, Copepoda) in a Colorado tarn with remarks on the vernalis-robustus complex

Reed

1986

Hydrobiologia

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Weekly mean lenghts of adult female Acanthocyclops robustus ranged between 1 .14 and 1 .41 mm in a Colorado alpine lake during the summer of 1966 . The smallest animals occurred in late September and the largest in mid-August, corresponding to development in warm and cool water, respectively. The males also declined in mean length during the course of the summer and were about 70% of the length of the females on any date . About 75% of the females possessed a 3 .4 .4 .4 spine formula; 8%, 2.3 .3 .3 and 17% an anomalous formula . Eight-one percent of the males had a 3 .4.4 .4 formula ; 7%, 2 .3 .3 .3 and 12% were anomalous . Morphological variation, and breeding experiments performed by Price (1958) suggest that A . robustus and A . vernalis as defined by Kiefer (1976) are likely species complexes, rather than just two species .

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“…While the biological validity of Price's isolates seems difficult to deny, Petkovski (1975) and Kiefer (1 976) believe that the crossing experiments on which his conclusions were based suffer from the fact that the material was not unambiguously defined taxonomically. Similar objections have been levelled against studies on the influence of certain factors, such as temperature, studied by Coker (1934)) on the number of spines or the modification of swimming setae of the legs (Kiefer, 1976). The tendencies noted were, in any case, obscured by individual variation.…”

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confidence: 92%

An ecological validation of a taxonomic distinction: the ecology of Acanthocyclops vernalis and A. robustus (Crustacea: Copepoda)

Fryer

1985

Zoological Journal of the Linnean Society

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Long‐standing taxonomic problems involving the vernalis complex of freshwater cyclopoid copepods of the genus Acanthocyclops have now been largely resolved, at least in Europe. Two species, A. vernalis and A. robustus, are recognizable on unambiguous morphological criteria, but each shows variation of a simular kind. Ecological data confirm this distinction. Ecological preferences are themselves reflected by the distribution patterns displayed in a restricted, but not small, area encompassing a diversity of environments. A. vernalis is eurytopic but displays a preference for acidic, calcium‐poor waters, low in total ions, and is exclusively benthic. By contrast A. robustus does not colonize strongly acidic waters (min. pH 6.42) and is restricted to alkaline, or weakly acidic, nutrient‐rich habitats. In some situations it becomes pelagic. While A. vernalis extends throughout the area frequented by A. robustus, the latter fails to colonize large tracts of upland country for which A. vernalis shows a definite preference and where it is common and widespread.

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Influence of temperature on form of the freshwater Copepod, Cyclops vernalis Fischer

Cited by 20 publications

References 5 publications

Egg‐Size Cycle of a Cladoceran

Egg‐Size Cycle of a Cladoceran

Esteval phenology of an Acanthocyclops (Crustacea, Copepoda) in a Colorado tarn with remarks on the vernalis-robustus complex

An ecological validation of a taxonomic distinction: the ecology of Acanthocyclops vernalis and A. robustus (Crustacea: Copepoda)

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