Density Estimates of Mysis relicta in Lake Michigan

1979 ◽  
Vol 36 (6) ◽  
pp. 694-698 ◽  
Author(s):  
Nevin E. Grossnickle ◽  
Mark D. Morgan
Keyword(s):  
Key Words ◽  
Lake Michigan ◽  
Density Estimates ◽  
Mysis Relicta ◽  
Deep Station ◽  
Late Instar ◽  
Order Of Magnitude

Density estimates of Mysis relicta based on night vertical net tows at stations of 30–50 m in Lake Michigan were about an order of magnitude larger than previous estimates based on sled tows. Significantly greater density estimates were obtained in night vertical net tows than those collected before sunset at these shallow stations. However, density estimates based on sled tows during daylight were not significantly different from those based on night vertical net tows at a 115-m station in Lake Michigan. At this deep station, a substantially larger percentage of late instar mysids was collected in sled tows than in night vertical net tows. Key words: Mysis relicta, Lake Michigan, density estimates, vertical net tows, epibenthic sled tows

Life History and Abundance of Mysis relicta in Lake Michigan

1978 ◽  
Vol 35 (9) ◽  
pp. 1165-1170 ◽  
Author(s):  
Mark D. Morgan ◽  
Alfred M. Beeton
Keyword(s):  
Life History ◽  
Key Words ◽  
Lake Michigan ◽  
Fourth Instar ◽  
Mysis Relicta ◽  
First Instar ◽  
Males And Females

Mysis relicta was sampled in Lake Michigan approximately monthly with an epibenthic sled, August 1975–July 1976. Total numbers ranged from a low of 23 m−2 in February to a high of 337 m−2 in May and averaged 188 m−2. It was possible to partition the population into five instars. Major peaks in proportions of first instar individuals occurred in March, July, and November. It took about 1 yr for first instar individuals to reach the fourth instar. Growth averaged a little less than 1 mm/mo. Males and females reached maturity and bred in the fourth instar, so females produced their first brood at 1 yr of age. Males died at this time, but females were found to molt to the fifth instar, mate, and produce a second brood approximately 4 mo later. Key words: Mysis relicta, Lake Michigan, life history, abundance

Feeding-Behavior Repertoire of the Alewife, Alosa pseudoharengus, and the Ciscoes Coregonus hoyi and C. artedii

1978 ◽  
Vol 35 (2) ◽  
pp. 249-253 ◽  
Author(s):  
John Janssen
Keyword(s):  
Great Lakes ◽  
Feeding Behavior ◽  
Key Words ◽  
Lake Michigan ◽  
Alosa Pseudoharengus ◽  
Calanoid Copepods ◽  
Mysis Relicta ◽  
Particulate Feeding ◽  
Coregonus Hoyi

Particulate feeding, where fish orient to and take prey one at a time, is shown by the alewife, Alosa pseudoharengus, and the ciscoes Coregonus hoyi and C. artedii. Specialized particulate feeding is found in ciscoes and alewives for capturing strongly swimming prey such as Mysis relicta and calanoid copepods. This involves simultaneous darting and sucking. Alewives filter feed by swimming with the mouth fully agape for 0.5–2 s while driving hard with the tail. Ciscoes do not filter feed, but they and alewives display gulping behavior where fish open and close the mouth 2–3 times/s, do not drive hard with the tail, and may take more than one prey per gulp. The alewife has difficulty feeding near or on the bottom. The ciscoes feed easily on or near the bottom and will also take buried prey. Key words: Alosa pseudoharengus, Coregonus hoyi, C. artedii, feeding behavior, Great Lakes, Lake Michigan

Mysis relicta in Lake Michigan: Abundances and Relationships with their Potential Prey, Daphnia

1990 ◽  
Vol 47 (5) ◽  
pp. 977-983 ◽  
Author(s):  
John T. Lehman ◽  
James A. Bowers ◽  
Robert W. Gensemer ◽  
Glenn J. Warren ◽  
Donn K. Branstrator
Keyword(s):  
Lake Michigan ◽  
Puget Sound ◽  
Mortality Rates ◽  
Reference Station ◽  
Potential Prey ◽  
Mysis Relicta ◽  
The North ◽  
Important Predator ◽  
Vertical Distributions

Mysis relicta were sampled at a 100-m reference staton in southeastern Lake Michigan (43°N 86°40′W) from 1985 to 1989, to quantify nighttime water column abundances and to compare vertical distributions with those of Daphnia. Diel vertical migration produced maximum concentrations in the thermocline at night of 1 to 10 mysids∙m−3. Variation among replicates averaged 28% with a 3-net Tucker trawl and 19% with Puget Sound vertical closing nets. Mean areal abundances over 5 yr averaged 110 mysids∙m−2 (SE = 20; n = 30; range = 25 to 645) based on nighttime vertical and oblique net tows at 1–3-wk intervals during summers at the reference station. Synoptic cruises from 43°N to 45°N during August indicated that densities were considerably greater offshore than inshore, and greater in the north than in the south. Hypothesized long-term changes in mysid abundances were not detected. Although Mysis is potentially an important predator on Daphnia, differences in nighttime vertical distributions reduce encounters between Mysis and Daphnia during summer in Lake Michigan, such that Mysis exert mortality rates on Daphnia of < 1.5% per day; the latter are in general less than 10% of the birth rates of Daphnia populations, estimated from fecundities.

Measurements of Dissolved Adenosine Triphosphate in Lake Michigan

1983 ◽  
Vol 40 (4) ◽  
pp. 542-547 ◽  
Author(s):  
James S. Maki ◽  
Michael E. Sierszen ◽  
Charles C. Remsen
Keyword(s):  
Microbial Biomass ◽  
Adenosine Triphosphate ◽  
Lake Michigan ◽  
Laboratory Work ◽  
Vertical Profiles ◽  
Mysis Relicta ◽  
Filtration Method ◽  
Filtration Effect

Comparisons of two methods of separating dissolved adenosine triphosphate (dATP) were made, both in the laboratory and in vertical profiles in Lake Michigan. Laboratory work indicated that filtration through a 0.2-μm pore filter or centrifugation of samples gave similar concentrations of dATP. In Lake Michigan, however, the filtration method gave significantly higher dATP concentrations suggesting some adverse filtration effect. Therefore, centrifugation was chosen as the method to determine dATP. Resulting particulate ATP (pATP) concentrations indicated the highest levels of microbial biomass were located below the epilimnion. Feeding by Mysis relicta appeared to decrease pATP but not release much dATP.

scholarly journals Behavioral response of Lake Michigan Daphnia mendotae to Mysis relicta

2005 ◽  
Vol 31 (2) ◽  
pp. 144-154 ◽  
Author(s):  
Scott D. Peacor ◽  
Kevin L. Pangle ◽  
Henry A. Vanderploeg
Keyword(s):  
Behavioral Response ◽  
Lake Michigan ◽  
Mysis Relicta

Seasonal Periodicity of Diatoms, and Silicon Limitation in Offshore Lake Michigan, 1975

1977 ◽  
Vol 34 (4) ◽  
pp. 552-558 ◽  
Author(s):  
J. I. Parker ◽  
H. L. Conway ◽  
E. M. Yaguchi
Keyword(s):  
Key Words ◽  
Primary Productivity ◽  
Rapid Growth ◽  
Lake Michigan ◽  
Spring Bloom ◽  
Accumulation Rate ◽  
Biomass Accumulation ◽  
Seasonal Periodicity ◽  
Silicon Uptake ◽  
Bloom Diatom

Diatom biomass maxima occurred in spring and fall and produced a bimodal bloom sequence at an offshore Lake Michigan station. The maximum in May was preceded by rapid growth as indicated by increased values of primary productivity and pigment concentration. As the spring bloom progressed, decreasing nutrient levels apparently slowed diatom growth. The diatom-biomass accumulation rate declined, assimilation quotients were minimal, and soluble reactive silicon was reduced from 13 to 6.8 μmol/ℓ. In summer, after the bloom, diatom biomass and silicon reached seasonal minima of < 250 mg C/m2 and ~ 1.0 μmol/ℓ, respectively. Diatom biomass increased again in October when silicon supplies were replenished and the concentration exceeded 6.6 μmol/ℓ. A critical silicon concentration of ~ 6.5 μmol/ℓ, may control the development and timing of offshore diatom populations in Lake Michigan. Key words: Lake Michigan, diatoms, growth, biomass, periodicity, silicon, uptake, limitation

Recent Invasion of a Red Alga (Bangia atropurpurea) in Lake Michigan

1977 ◽  
Vol 34 (12) ◽  
pp. 2413-2416 ◽  
Author(s):  
C. Kwei Lin ◽  
John L. Blum
Keyword(s):  
Trace Metals ◽  
Key Words ◽  
Vegetative Growth ◽  
Lake Michigan ◽  
Red Alga ◽  
Basal Cells ◽  
High Concentrations ◽  
Bangia Atropurpurea

Bangia atropurpurea was first found on the southwestern shore of Lake Michigan in 1968; by 1976 it had covered suitable substrates on the southern two thirds of the lakeshore. Optimal vegetative growth occurred above the low waterline during the spring and fall, especially near harbor areas. Vegetative growth is initiated from either perennating basal cells or monospores. Bangia contained extraordinarily high concentrations of bromine and zinc, suggesting it requires relatively high levels of halogens and trace metals, which are present in runoff waters and contaminated harbors. Key words: Bangia, invasion, Lake Michigan, halogens, trace metals, algal zonation

Phosphate Uptake by Microorganisms in Lake Water: Deviations from Simple Michaelis–Menten Kinetics

1986 ◽  
Vol 43 (2) ◽  
pp. 319-328 ◽  
Author(s):  
Stephen J. Tarapchak ◽  
Lynn R. Herche
Keyword(s):  
Lake Michigan ◽  
Simulation Analysis ◽  
Phosphate Uptake ◽  
Laboratory Culture ◽  
Microbial Populations ◽  
Culture Studies ◽  
Equation Analysis ◽  
Uptake Rates ◽  
Order Of Magnitude ◽  
Substrate Concentrations

Orthophosphate (31Pi) uptake rates by natural Lake Michigan microbial assemblages were measured to test a hypothesis that the instantaneous velocity of 31Pi uptake at low added substrate concentrations is higher than predicted by the simple Michaelis–Menten equation. Analysis of data from most experiments verified this prediction: 31Pi turnover times (Tcalc) obtained by back-extrapolating from "low" substrate regions in Woolf plots ranged from 25% to nearly 3000% of those calculated from "high" substrate regions. Simulation analysis demonstrated that deviations in Tcalc could be at least an order of magnitude higher than previously predicted. Large (>1000%) discrepancies from the simple Michaelis–Menten equation could be caused by "skewed" or "clumped" distributions, where the range in both species half-saturation constants (Kt) and relative abundances is very wide and species with the lowest Kt values are most abundant. A comparison of Kt values for mixed microbial assemblages in Lake Michigan (0.16–19.4 μg P∙L−1) with those from laboratory culture studies (11–364 μg P∙L−1) demonstrates that natural microbial populations have adapted to P-limited environments by synthesizing uptake systems that have Kt values at least an order of magnitude below those detected in culture studies.

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