New Distribution Record for the Endangered Crawling Water Beetle Brychius Hungerfordi (Coleoptera: Haliplidae) and Notes on Seasonal Abundance and Food Preferences

The Federally beetle, Brychius hungerfordi, has been discovered at a new location in Northern Lower Peninsula of Michigan. We also report preliminary data on a seasonal variation in relative abundance and on its possible food plants

Size Estimate of a Local Population of Brychius Hungerfordi (Coleoptera: Haliplidae)

Much of the natural history of the endangered crawling water beetle, Brychius hungerfordi, is unknown. Population estimates have only been surmised. We have measured, using a mark and recapture technique, a localize population of the beetle in a pool on the East Branch of the Maple River, Emmet County, Michigan. The average population during July 2001 was found to be 1052 individuals with a range of 43 (highest estimate – lowest estimate). A three-year study of the relative abundance of the beetle in the same pool suggests that the population has remained relatively constant

New Record for the Endangered Crawling Water Beetle, \u3ci\u3eBrychius Hungerfordi\u3c/i\u3e (Coleoptera: Haliplidae) in Michigan Including Water Chemistry Data

We report the discovery of the Federally endangered crawling water beetle, Brychius hungerfordi Spangler, in a new watershed in the northern lower peninsula of MIchigan. The site was found on the Carp River, a lake draining first-order stream. Nine water chemistry parameters were measured from three known locations of B. hungerfordi and from three sites where no B. hungerfordi have been found. Water from sites with known populations of adult beetles showed low soluble reactive phosphorus, but were similar to other similar rivers in northern Michigan

New Distribution Record for the Endangered Crawling Water Beetle Brychius Hungerfordi (Coleoptera: Haliplidae) and Notes on Seasonal Abundance and Food Preferences

The Federally beetle, Brychius hungerfordi, has been discovered at a new location in Northern Lower Peninsula of Michigan. We also report preliminary data on a seasonal variation in relative abundance and on its possible food plants

Size Estimate of a Local Population of Brychius Hungerfordi (Coleoptera: Haliplidae)

Much of the natural history of the endangered crawling water beetle, Brychius hungerfordi, is unknown. Population estimates have only been surmised. We have measured, using a mark and recapture technique, a localize population of the beetle in a pool on the East Branch of the Maple River, Emmet County, Michigan. The average population during July 2001 was found to be 1052 individuals with a range of 43 (highest estimate – lowest estimate). A three-year study of the relative abundance of the beetle in the same pool suggests that the population has remained relatively constant

New Record for the Endangered Crawling Water Beetle, \u3ci\u3eBrychius Hungerfordi\u3c/i\u3e (Coleoptera: Haliplidae) in Michigan Including Water Chemistry Data

We report the discovery of the Federally endangered crawling water beetle, Brychius hungerfordi Spangler, in a new watershed in the northern lower peninsula of MIchigan. The site was found on the Carp River, a lake draining first-order stream. Nine water chemistry parameters were measured from three known locations of B. hungerfordi and from three sites where no B. hungerfordi have been found. Water from sites with known populations of adult beetles showed low soluble reactive phosphorus, but were similar to other similar rivers in northern Michigan

Changes in tree composition of two forestry plots in a northern hardwood forest in Michigan from 1934-1980.

Biogeochemistry of Northern ForestsTree composition of two forestry plots was studied in a northern hardwood forest in Michigan from 1934-1980. One plot had been selectively thinned from 1934•1954; the other plot was unmanipulated (control). Sugar maple was the leading dominant in both plots. Basswood was second most dominant in the thinned plot and beech was second most dominant in the control plot. As sugar maple increased in importance, beech and ironwood decreased in importance. Sugar maple may limit beech and ironwood due to more successful competition for resources. Basswood decreased in importance after conclusion of cutting in the thinned plot which may relate successful growth of basswood to canopy holes left after cutting. Both plots decreased in diversity from 1934-1980. Big-toothed aspen, white birch, red oak and possibly basswood are only present as large trees in the canopy and are expected to leave the forest as these large trees die (no successful reproduction due to shading out of seedlings). Density decreased as basal area increased for the control plot. Density and basal area decreased due to cutting in the thinned plot (1934-1954); density increased from 1954-1980 to approximately 3/4 of the original density before cutting in 1934. As the thinned plot matures density is expected to decrease.http://deepblue.lib.umich.edu/bitstream/2027.42/97299/1/Ebbers_Bert_1980.PD