Size segregation and seasonal patterns in rusty crayfish Faxonius rusticus distribution and abundance on northern Lake Michigan spawning reefs

2021 ◽  
Author(s):  
Jake T. Kvistad ◽  
Jason T. Buckley ◽  
Krista M. Robinson ◽  
Tracy L. Galarowicz ◽  
Randall M. Claramunt ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Seasonal Patterns ◽  
Size Segregation ◽  
Rusty Crayfish

Seasonal Patterns in Lipid Content of Lake Michigan Macroinvertebrates

1985 ◽  
Vol 42 (11) ◽  
pp. 1827-1832 ◽  
Author(s):  
Wayne S. Gardner ◽  
Thomas F. Nalepa ◽  
William A. Frez ◽  
Elizabeth A. Cichocki ◽  
Peter F. Landrum
Keyword(s):  
Lipid Content ◽  
Seasonal Changes ◽  
Loss Rate ◽  
Lake Michigan ◽  
Dry Weight ◽  
Seasonal Patterns ◽  
Organic Detritus ◽  
Mysis Relicta ◽  
Chironomid Larvae

Lipids in several taxa of macroinvertebrates from Lake Michigan were determined seasonally to help define the role of these animals in transferring energy in the lake. Ranges of mean lipid content relative to ash-free dry weight (AFDW) throughout the year were as follows: amphipods (Pontoporeia hoyi), 21–54%; lumbriculid oligochaetes (Stylodrilus heringianus), 12–19%; tubificid oligochaetes, 9–22%; chironomid larvae, 9–39%; and Mysis relicta, 26–37%. A pattern of increasing lipid content during spring was observed for P. hoyi, chironomids, and M. relicta, but seasonal changes were not apparent for oligochaetes. Excluding M. relicta, P. hoyi accounted for about 65% of the biomass and 70% of the energy contained in southern Lake Michigan benthic macroinvertebrates and may assimilate up to 30% of the total bioavailable organic detritus settling into the offshore hypolimnion. Calculation of the predation loss rate (production rate minus nonpredatory death rate) of P. hoyi indicated that about 13 000 cal∙m−2 (2.1 g AFDW∙m−2) of this amphipod may be consumed annually by fish and other predators in southern Lake Michigan.

scholarly journals An evaluation of three trap designs for invasive rusty crayfish (Faxonius rusticus) suppression on critical fish spawning habitat in northern Lake Michigan

2021 ◽  
Vol 12 (4) ◽  
pp. 975-996
Author(s):  
Jake Kvistad ◽  
Tracy Galarowicz ◽  
David Clapp ◽  
Lindsay Chadderton ◽  
Andrew Tucker ◽  
...  
Keyword(s):  
Lake Michigan ◽  
Spawning Habitat ◽  
Rusty Crayfish ◽  
Fish Spawning

Ultrastructure of Melosira resting cell rejuvenation

1984 ◽  
Vol 42 ◽  
pp. 734-735
Author(s):  
C. E. M. Bourne ◽  
L. Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Lake Michigan ◽  
Light And Electron Microscopy ◽  
Resting Cells ◽  
Planktonic Diatoms ◽  
Resting Cell ◽  
Vegetative Survival ◽  
Cytological Changes ◽  
Recent Attention ◽  
Freshwater Diatom

Much recent attention has been focused on vegetative survival forms of planktonic diatoms and other algae. There are several reports of extended vegetative survival of the freshwater diatom Melosira in lake sediments. In contrast to those diatoms which form a morphologically distinct resistant spore, Melosira is known to produce physiological resting cells that are indistinguishable in outward morphology from actively growing cells.We used both light and electron microscopy to document and elucidate the sequence of cytological changes during the transition from resting cells to actively growing cells in a population of Melosira granulata from Douglas Lake, Michigan sediments collected in mid-July of 1983.

Seasonal Variation of Suicide in the City of São Paulo, Brazil, 1996–2010

Crisis ◽  
2014 ◽  
Vol 35 (1) ◽  
pp. 5-9 ◽  
Author(s):  
Daniel Hideki Bando ◽  
Fernando Madalena Volpe
Keyword(s):  
Seasonal Pattern ◽  
Total Sample ◽  
Sao Paulo ◽  
Seasonal Patterns ◽  
São Paulo ◽  
Health Statistics ◽  
Males And Females ◽  
June July ◽  
The City ◽  
Over Time

Background: In light of the few reports from intertropical latitudes and their conflicting results, we aimed to replicate and update the investigation of seasonal patterns of suicide occurrences in the city of São Paulo, Brazil. Methods: Data relating to male and female suicides were extracted from the Mortality Information Enhancement Program (PRO-AIM), the official health statistics of the municipality of São Paulo. Seasonality was assessed by studying distribution of suicides over time using cosinor analyses. Results: There were 6,916 registered suicides (76.7% men), with an average of 39.0 ± 7.0 observed suicides per month. For the total sample and for both sexes, cosinor analysis estimated a significant seasonal pattern. For the total sample and for males suicide peaked in November (late spring) with a trough in May–June (late autumn). For females, the estimated peak occurred in January, and the trough in June–July. Conclusions: A seasonal pattern of suicides was found for both males and females, peaking in spring/summer and dipping in fall/winter. The scarcity of reports from intertropical latitudes warrants promoting more studies in this area.

Depletion of coating color components in the blade coating process circulation

TAPPI Journal ◽  
2011 ◽  
Vol 10 (9) ◽  
pp. 17-23 ◽  
Author(s):  
ANNE RUTANEN ◽  
MARTTI TOIVAKKA
Keyword(s):  
Fine Particles ◽  
Particle Density ◽  
Stable Process ◽  
Size Fraction ◽  
Color Stability ◽  
Strong Interactions ◽  
Coating Process ◽  
Size Segregation ◽  
Coating Color ◽  
Average Size

Coating color stability, as defined by changes in its solid particle fraction, is important for runnability, quality, and costs of a paper coating operation. This study sought to determine whether the size or density of particles is important in size segregation in a pigment coating process. We used a laboratory coater to study changes in coating color composition during coating operations. The results suggest that size segregation occurs for high and low density particles. Regardless of the particle density, the fine particle size fraction (<0.2 μm) was the most prone for depletion, causing an increase in the average size of the particles. Strong interactions between the fine particles and other components also were associated with a low depletion tendency of fine particles. A stable process and improved efficiency of fine particles and binders can be achieved by controlling the depletion of fine particles.

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