An Experimental Approach to the Dynamics of a Natural Population of Daphnia Galeata Mendotae

Ecology ◽  
1964 ◽  
Vol 45 (1) ◽  
pp. 94 ◽  
Author(s):  
Donald James Hall
Keyword(s):  
Natural Population ◽  
Experimental Approach ◽  
Daphnia Galeata ◽  
Daphnia Galeata Mendotae

Dieldrin reduces male production and sex ratio in Daphnia galeata mendotae

1999 ◽  
Vol 15 (1-2) ◽  
pp. 193-200 ◽  
Author(s):  
Christine M. Merritt ◽  
Laura Torrentera ◽  
Katherine M. Winter ◽  
Christopher K. Tornehl ◽  
Kristin Girvin ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Male Production ◽  
Daphnia Galeata ◽  
Daphnia Galeata Mendotae

Freshwater Zooplankton Community Structure: Introduction of Large Invertebrate Predators and Large Herbivores to a Small Species Community

1988 ◽  
Vol 45 (10) ◽  
pp. 1758-1770 ◽  
Author(s):  
Michael J. Vanni
Keyword(s):  
Introduced Species ◽  
Zooplankton Community ◽  
Zooplankton Species ◽  
Small Species ◽  
Daphnia Galeata ◽  
Resident Species ◽  
Large Herbivores ◽  
Fishless Lakes ◽  
Invertebrate Predators ◽  
Daphnia Galeata Mendotae

Two hypotheses have been proposed to explain the scarcity of small zooplankton species in fishless lakes, in which large zooplankton species dominate: (1) selective predation on small species by large invertebrate predators and (2) competitive suppression of small species by large herbivores. These hypotheses were tested at the Experimental Lakes Area (ELA) by introducing a large invertebrate predator, Chaoborus americanus, and a large herbivore, Daphnia catawba, both common in fishless ELA lakes, into a zooplankton community typical of ELA lakes with fish (small zooplankton species present). Chaoborus had much more of an impact than D. catawba on resident zooplankton, although both introduced species significantly reduced the abundance of some resident species. Daphnia galeata mendotae, the dominant species in the absence of introduced species, was reduced to virtual extinction by Chaoborus. The cladocerans Bosmina and Diaphanosoma, the copepods Diaptomus spp., and the rotifer Conochilus also were reduced in abundance by Chaoborus. Daphnia galeata mendotae and Bosmina were the only resident species consistently reduced in abundance by D. catawba. These results support current conceptual models that depict invertebrate predation as an important factor responsible for the relative scarcity of small zooplankton species in fishless lakes.

New microsatellite primers for Daphnia galeata mendotae

2004 ◽  
Vol 4 (4) ◽  
pp. 544-546 ◽  
Author(s):  
JENNIFER A. FOX
Keyword(s):  
Microsatellite Primers ◽  
Daphnia Galeata ◽  
Daphnia Galeata Mendotae

Periodicity of Egg Laying and Egg Age Distributions in Planktonic Cladocera

1984 ◽  
Vol 41 (3) ◽  
pp. 409-413 ◽  
Author(s):  
Alan J. Tessier
Keyword(s):  
Negative Correlation ◽  
Natural Populations ◽  
Egg Laying ◽  
Daphnia Galeata ◽  
Molt Cycle ◽  
Egg Development ◽  
Daphnia Species ◽  
Diel Cycles ◽  
Development Times ◽  
Daphnia Galeata Mendotae

In natural populations of planktonic Cladocera, I observed significant diel, molt cycle, and cohort periodicity of egg laying. Diel cycles of egg laying were pronounced in one population of Daphnia galeata mendotae; most females laid eggs only at dawn. There was a strongly negative correlation between diel egg laying cycles of coexisting Daphnia species. Egg laying in two Daphnia populations cycled with a period approximating the egg development times, suggesting a synchronization of individual molt cycles. Noncontiguous reproduction was characteristic of a population of Holopedium gibberum. Adults reproduced synchronously and then died; there was little overlap of generations.

Dieldrin reduces male production and sex ratio in Daphnia galeata mendotae

1999 ◽  
Vol 15 (1) ◽  
pp. 192-199 ◽  
Author(s):  
S.I. Dodson ◽  
C.M. Merritt ◽  
L. Torrentera ◽  
K.M. Winter ◽  
C.K. Tornehl ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Male Production ◽  
Daphnia Galeata ◽  
Daphnia Galeata Mendotae

Vertical Migration in Daphnia galeata mendotae (Brooks): Demographic Responses to Changes in Planktivore Abundance

1990 ◽  
Vol 47 (2) ◽  
pp. 395-400 ◽  
Author(s):  
D. G. Stirling ◽  
D. J. McQueen ◽  
M. R. S. Johannes
Keyword(s):  
Residence Time ◽  
Vertical Migration ◽  
Daphnia Galeata ◽  
Population Densities ◽  
Data Set ◽  
Migration Patterns ◽  
Order Of Magnitude ◽  
Daphnia Galeata Mendotae ◽  
Demographic Responses

We tested the hypothesis that changes in vertical migration patterns in Daphnia galeata mendotae were correlated with changes in planktivore numbers. A 4-yr data set from Lake St. George showed that during 1982, when planktivores numbered approximately 2500∙ha−1, adult D. galeata mendotae were found in the epilimnion at both midday and midnight. During 1984 and 1985, when planktivores were almost an order of magnitude more abundant, adult D. galeata mendotae were detected in the epilimnion only at night, and the amplitude of migration increased by a factor of two. Changes in diel population densities were associated with these interannual differences in vertical migration patterns. These results suggest that between-year differences in vertical migration patterns were strongly associated with changes in planktivore density which may have influenced the selective value of increased hypolimnetic residence time.

Inferred effects of lake acidification on Daphnia galeata mendotae

1990 ◽  
Vol 24 (8) ◽  
pp. 1259-1261 ◽  
Author(s):  
Wendel Keller ◽  
Norman D. Yan ◽  
Keith E. Holtze ◽  
J. Roger Pitblado
Keyword(s):  
Lake Acidification ◽  
Daphnia Galeata ◽  
Daphnia Galeata Mendotae

Population Dynamics of Daphnia galeata mendotae as Modified by Chronic Cadmium Stress

1978 ◽  
Vol 35 (4) ◽  
pp. 461-469 ◽  
Author(s):  
J. S. Marshall
Keyword(s):  
Population Dynamics ◽  
Carrying Capacity ◽  
Brood Size ◽  
Lake Michigan ◽  
Cadmium Stress ◽  
Whole Body ◽  
Average Weight ◽  
Daphnia Galeata ◽  
Female Ratio ◽  
Daphnia Galeata Mendotae

Forty populations of Daphnia galeata mendotae were maintained for 22 wk (or until they became extinct) in a medium consisting of filtered Lake Michigan water to which Chlamydomonas reinhardi and different concentrations of a mixture of labelled (109Cd) plus stable CdCl2 were added 24 h before use. The medium was changed daily Monday through Fridays. Weekly determinations were made of total numbers, average individual dry weight, mean brood size, egg–female ratio, aborted eggs and embryos, and average whole-body 109Cd content. Chronic cadmium stress reduced the populations' average numbers and biomass, while it increased the populations' turnover rates, temporal variability, probability of extinction, and proportion of ovigerous females. For individuals there was increased prenatal mortality, reduced life expectancy, increased average weight, and increased brood size. Due to compensatory increases in the proportion of ovigerous females and mean brood size, the cadmium sensitivity of population attributes was considerably less than that of the most sensitive individual attribute, prenatal mortality. A linear relationship between population carrying capacity (relative mean numbers) and added cadmium concentration indicated that the effective concentration for a 50% reduction of carrying capacity (EC50) is 7.7 μg Cd/L and that for a 1% reduction (EC1) is 0.15 μg Cd/L. An increase of 0.15 μg Cd/L in Lake Michigan itself, barring synergistic interaction with other factors in the lake, would probably not have a detectable effect on the population dynamics of D. galeata mendotae. Key words: zooplankton dynamics, stress ecology, Daphnia galeata mendotae, cadmium, heavy metals, toxic substances, Laurentian Great Lakes

Acid and Aluminum Effects on Sodium Homeostasis and Survival of Acid-Sensitive and Acid-Tolerant Cladocera

1992 ◽  
Vol 49 (11) ◽  
pp. 2392-2398 ◽  
Author(s):  
Karl E. Havens
Keyword(s):  
Acid Stress ◽  
Relative Increase ◽  
Al Toxicity ◽  
Whole Body ◽  
Population Declines ◽  
Daphnia Galeata ◽  
Sodium Homeostasis ◽  
Bosmina Longirostris ◽  
Acid Tolerant ◽  
Daphnia Galeata Mendotae

Acid-sensitive (Daphnia galeata mendotae) and acid-tolerant (Bosmina longirostris) cladocerans were exposed to 0, 100, or 200 μg Al/L at pH 4.5, 6.0, or 7.5. Whole-body Na content and survivals were determined after 12- and 24-h exposures to the nine treatments. Daphnia galeata mendotae experienced significant decreases in body Na content and survival at pH 4.5. Aluminum effects were pH dependent. At pH 7.5 and 6.0, Na content and survival declined with increasing Al; at pH 4.5, the highest Al concentration enhanced Na content and prolonged survival. Bosmina longirostris Na content and survival were only slightly reduced at pH 4.5, and there were no significant Al or pH × Al interaction effects. The results support the view that (1) the extinction of D. galeata mendotae and the relative increase of B. longirostris during lake acidification are largely due to differential impacts of acid stress on osmoregulation and (2) Al toxicity might also be a factor responsible for D. galeata mendotae population declines, which are most pronounced near pH 6.0.

Daphnia galeata mendotae as a cryptic species complex with interspecific hybrids

1992 ◽  
Vol 37 (3) ◽  
pp. 658-665 ◽  
Author(s):  
Derek J. Taylor ◽  
Paul D. N. Hebert
Keyword(s):  
Cryptic Species ◽  
Interspecific Hybrids ◽  
Species Complex ◽  
Daphnia Galeata ◽  
Cryptic Species Complex ◽  
Daphnia Galeata Mendotae
Sign in / Sign up

Export Citation Format

Share Document