Cyclops scutifer SARS in Lake Latnjajaure, Swedish Lapland

1994 ◽  
pp. 101-114
Author(s):  
Arnold Nauwerck
Keyword(s):  
Cyclops Scutifer

Morphology and biology of Cyclops scutifer Sars, 1863 in high mountain lakes of East Siberia (including Lake Amut)

2016 ◽  
Vol 35 (2) ◽  
pp. 258-264
Author(s):  
Natalya G. Sheveleva ◽  
Mydygma Ts. Itigilova ◽  
Ayushcuren Chananbaator
Keyword(s):  
Mountain Lakes ◽  
High Mountain ◽  
East Siberia ◽  
High Mountain Lakes ◽  
Cyclops Scutifer

ZOOPLANKTON OF LAKE HAZEN, ELLESMERE ISLAND, AND A NEARBY POND, WITH SPECIAL REFERENCE TO THE COPEPOD CYCLOPS SCUTIFER SARS

1964 ◽  
Vol 42 (4) ◽  
pp. 613-629 ◽  
Author(s):  
I. A. McLaren
Keyword(s):  
Special Reference ◽  
Standing Crop ◽  
Dry Weight ◽  
High Arctic ◽  
Ellesmere Island ◽  
Arctic Lakes ◽  
Net Production ◽  
Daphnia Middendorffiana ◽  
Ice Conditions ◽  
Cyclops Scutifer

Zooplankton was studied in the large, high-arctic Lake Hazen and in a small nearby pond. Primary (O2) production in Lake Hazen may have occurred largely before the ice began to melt, but was unmeasurable in summer. Primary production in the pond was about the same as in other small arctic lakes, Cyclops scutifer was overwhelmingly dominant in Lake Hazen. C. scutifer and Daphnia middendorffiana were commonest in the pond. C, scutifer is annual in Scandinavia, often with coexisting spring-born and fall-born generations. On Ellesmere Island the pond appears to contain alternating annual and biennial generations, whereas the species is strictly biennial in Lake Hazen. Numbers of C. scutifer in Lake Hazen were greatly reduced as a result of summer ice conditions between 1958 and 1961, while the rotifer Keratella hiemalis increased. Estimated mean standing crop (96 mg/m2) and net production (1.0 mg/m2 day) in dry weight ol C. scutifer in Lake Hazen during the summer of 1958 were extremely low. In early August the crop of this species in the pond was abont the same as in Lake Hazen, but net production was sonic 15 times as large, and other zooplankters added considerably to crop and production of the pond.

Zooplankton Species Abundance and Biomass in Relation to Occurrence of Mysis relicta (Malacostraca: Mysidacea)

1986 ◽  
Vol 43 (2) ◽  
pp. 420-434 ◽  
Author(s):  
Redwood W. Nero ◽  
W. Gary Sprules
Keyword(s):  
Species Differences ◽  
Species Abundance ◽  
Canonical Analysis ◽  
Zooplankton Abundance ◽  
Zooplankton Species ◽  
Mysis Relicta ◽  
Isothermal Conditions ◽  
Competitive Release ◽  
Lakes And Reservoirs ◽  
Cyclops Scutifer

Year-long comparisons of the occurrence and abundance of zooplankton between two lakes where Mysis relicta is endemic and two where it is not show that in the former, hypolimnetic species Daphnia longiremis, Euhosmina longispina, Cyclops scutifer, and Diaptomus sanguineus are rare. Five other cladocerans were also lower in abundance in hypolimnetic strata and during isothermal conditions. Diaphanosoma spp. were more abundant in the metalimnion of lakes with Mysis; we suggest a competitive release through Mysis predation on Daphnia. Because each pair of lakes is comparable with respect to morphometry and chemistry, nonpredatory influences do not account for the observed distribution of zooplankton. Such species differences are also identical to trends occurring in a canonical analysis of zooplankton abundance for 497 lakes in eastern Ontario and western Quebec and corroborate declines in Cladocera associated with introductions of M. relicta into lakes and reservoirs.

Cyclops scutifer SARS in Lake Latnjajaure, Swedish Lapland

Hydrobiologia ◽  
1994 ◽  
Vol 274 (1-3) ◽  
pp. 101-114 ◽  
Author(s):  
Arnold Nauwerck
Keyword(s):  
Cyclops Scutifer

A Bottom Resting Stage in the Planktonic Freshwater Copepod Cyclops scutifer Sars

Oikos ◽  
1962 ◽  
Vol 13 (2) ◽  
pp. 306 ◽  
Author(s):  
Kåre Elgmork ◽  
Kare Elgmork
Keyword(s):  
Cyclops Scutifer

Plankton, Chemistry, and Physics of Lakes in the Churchill Falls Region of Labrador

1974 ◽  
Vol 31 (6) ◽  
pp. 1105-1117 ◽  
Author(s):  
H. C. Duthie ◽  
M. L. Ostrofsky
Keyword(s):  
Granite Gneiss ◽  
Biological Data ◽  
Lake Area ◽  
Secchi Disc ◽  
Positive Correlation ◽  
Maximum Surface ◽  
Natural Lakes ◽  
Asterionella Formosa ◽  
Bosmina Coregoni ◽  
Cyclops Scutifer

Of 10 lakes and a reservoir in the Churchill Falls region of western Labrador studied in 1970–71, nine lakes were 12 m or less deep, humic, thermally unstratified, and had Secchi disc transparencies between 3.5 and 8.25 m. Maximum surface temperatures of 16–17 C in the nine lakes were generally reached by mid-August. Michikamau Lake (area 1980 km2, depth 84 m) rarely exceeded 12 C and had a Secchi disc transparency of 13 m. Conductivities and alkalinities (as CaCO3) ranged from about 13 μmho/cm and less than 6.5 mg/liter, for lakes draining granite, gneiss, or quartz bedrock, to about 30 and 15, for those draining gabbro or slate. Maximum live phytoplankton biomasses in 1970 ranged from 70 mg/m3, in Michikamau Lake, to 739 mg/m3, in Ossokmanuan Reservoir, and, in general, there was a positive correlation with conductivity. Diatoms were the most abundant group, in particular Asterionella formosa, Tabellaria fenestrata, and Rhizosolenia eriensis; however, flagellated Chrysophyta, mainly species of Dinobryon, were more abundant in the reservoir than in the natural lakes. Predominant zooplankters included Diaptomus minutus, Cyclops scutifer, Holopedium gibberum, Daphnia longiremis, D. galeata mendotae, and Bosmina coregoni. Maximum seasonal standing crops ranged from 1600 to 8910 individuals/m3, with the highest densities being found in the reservoir. The chemical and biological data suggested that the reservoir 8 yr after filling, showed little evidence of trophic upsurge and was possibly entering a period of trophic depression.

The life history of Cyclops scutifer Sars (Copepoda: Cyclopoida) in a small lake of the Matamek River System, Quebec

1978 ◽  
Vol 56 (12) ◽  
pp. 2603-2607 ◽  
Author(s):  
J. J. Boers ◽  
J. C. H. Carter
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Calanoid Copepod ◽  
River System ◽  
The Other ◽  
Cyclopoid Copepod ◽  
Small Lake ◽  
History Of ◽  
Cyclops Scutifer ◽  
Copepoda Cyclopoida

A study of the life history of the cyclopoid copepod Cyclops scutifer Sars in a small lake of the Matamek River System, Quebec, indicates a 1-year life cycle with four cohorts produced annually. The primary cohort overwinters as early nauplii and reaches maturity during midsummer when it spawns the primary cohort of the succeeding year. The other cohorts may merge with either each other or the primary cohort and contribute somewhat less to the overall cycle. Slower development of copepodites of the second cohort in 1976 may have been the result of an inadequate number of naupliar prey from the calanoid copepod Diaptomus minutus.

Cycles de développement de Skistodiaptomus oregonensis, Tropocyclops prasinus et Cyclops scutifer dans la zone limnétique du lac Cromwell, Saint-Hippolyte, Québec

1982 ◽  
Vol 60 (2) ◽  
pp. 139-151 ◽  
Author(s):  
Michèle Paquette ◽  
Bernadette Pinel-Alloul
Keyword(s):  
Life History ◽  
Life Cycle ◽  
Water Temperature ◽  
Food Availability ◽  
Development Times ◽  
Decisive Importance ◽  
History Of ◽  
Cyclops Scutifer

A study of the life history of the three principal copepods (Skistodiaptomus oregonensis, Tropocyclops prasinus, Cyclops scutifer) in Lake Cromwell, Québec, demonstrated that these species are multivoltine. Skistodiaptomus oregonensis and T. prasinus have analogous life cycle strategies with two cohorts produced annually and active winter diapause as instar CV and adult; however, their reproductive periods are 2 months apart (May and July). Cyclops scutifer has two summer cohorts and a winter cohort without active diapause. The development times of cohorts are strongly related to water temperature but food availability and water oxygenation could also be of decisive importance for the development of summer cohorts.

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