PLASMA BIOCHEMISTRY AND PROTEIN ELECTROPHORESIS REFERENCE INTERVALS OF THE COMMON LOON (GAVIA IMMER)

2020 ◽  
Vol 51 (3) ◽  
Author(s):  
Michelle Kneeland ◽  
Emily Berman ◽  
Tiffany Grade ◽  
John Cooley ◽  
Harry Vogel ◽  
...  
Keyword(s):  
Reference Intervals ◽  
Protein Electrophoresis ◽  
Gavia Immer ◽  
Common Loon ◽  
Plasma Biochemistry ◽  
The Common

scholarly journals Additional Data and Perspectives on Interspecific Aggression in the Common Loon, Gavia immer

2011 ◽  
Vol 125 (1) ◽  
pp. 61
Author(s):  
Martin L. Morton ◽  
Maria E. Pereyra
Keyword(s):  
Additional Data ◽  
Gavia Immer ◽  
Common Loon ◽  
Interspecific Aggression ◽  
Aythya Americana ◽  
The Common

We witnessed the killing of a female Redhead (Aythya Americana) by a male Common Loon (Gavia immer). The wound was delivered into the abdomen from below, and death occurred because of a torn, hemorrhaging liver. This same Common Loon also threatened a female Ring-necked Duck (Aythya collaris) with ducklings. We hypothesize that interspecific aggression by loons might be energetically costly but is sometimes adaptive because it deters predators.

Dynamics of an Aggressive Vocalization in the Common Loon (Gavia immer): A Review

Waterbirds ◽  
2014 ◽  
Vol 37 (sp1) ◽  
pp. 37-46 ◽  
Author(s):  
John N. Mager ◽  
Charles Walcott
Keyword(s):  
Gavia Immer ◽  
Common Loon ◽  
The Common

scholarly journals Plunging floater survival causes cryptic population decline in the Common Loon

The Condor ◽  
2020 ◽  
Author(s):  
Walter H Piper ◽  
Jason Grear ◽  
Brian Hoover ◽  
Elaina Lomery ◽  
Linda M Grenzer
Keyword(s):  
New England ◽  
Adult Population ◽  
Population Decline ◽  
Gavia Immer ◽  
Common Loon ◽  
Vital Rates ◽  
Geographic Ranges ◽  
The Common ◽  
Anthropogenic Threats ◽  
Territory Occupancy

Abstract Populations of many vertebrates are declining and geographic ranges contracting, largely as a consequence of anthropogenic threats. Many reports of such decline, however, lack the breadth and detail to narrow down its causes. Here we describe population decline in the Common Loon (Gavia immer), a charismatic aquatic bird, based on systematic resighting and measurement of a marked population. During our 27-year investigation, age-adjusted chick mass has fallen by 11%, mortality among young and old chicks has increased by 31% and 82%, respectively, and fledging success has declined by 26%. Meanwhile, the return rate of marked nonbreeders (“floaters”) has plunged by 53%, and the adult population overall has declined by 22%. Consistent with the thinning ranks of floaters, the rate of territory eviction has decreased by 52% during the study. Despite the decline in floaters, territory occupancy remains unchanged. However, a matrix model, updated with recent estimates for breeding success, juvenile survival, and senescence, yields a recalculated deterministic population growth rate (λ) of 0.94 for our study population, which suggests that declines in vital rates could lead to a loss of 52% of the current population and a decline of 37% in territory occupancy by 2031. Lack of data on floaters in other upper Midwest and New England loon populations leaves their status in doubt.

Fine structure of the pecten oculi of the common loon (Gavia immer)

1986 ◽  
Vol 64 (10) ◽  
pp. 2181-2186 ◽  
Author(s):  
C. R. Braekevelt
Keyword(s):  
Electron Microscopy ◽  
Basal Lamina ◽  
Light And Electron Microscopy ◽  
Gavia Immer ◽  
Common Loon ◽  
Luminal Surface ◽  
Pecten Oculi ◽  
The Common ◽  
Diving Bird ◽  
Region Form

The pecten oculi of a diurnally active diving bird, the common loon (Gavia immer), was studied by light and electron microscopy. In this species the pecten consists of a pleated, highly vascular, pigmented structure that is situated over the optic nerve head and projects into the vitreous chamber. Fourteen to 15 accordion folds are joined apically by a heavily pigmented bridge of tissue, which holds the pecten in a fanlike shape, widest at the base. A distinct basal lamina encloses the entire pecten. Within each fold are numerous capillaries, melanocytes, and larger blood vessels that are often difficult to differentiate as either arterioles or venules. The capillaries are surrounded by basal laminae separated from the endothelial cells by several fibrillar layers. Pericytes are often enclosed within the basal lamina. These capillaries display numerous microfolds on their luminal surface, with a slightly reduced number of processes on the abluminal border. The endothelial cell body is extremely thin and most organelles are in the paranuclear region. The melanocytes, which are most numerous in the bridge region, form an incomplete sheath around these capillaries. As in other species, the morphology of the pecten in the loon indicates a heavy involvement in the transport of materials.

Wildlife Criterion Value for the Common Loon (Gavia immer) in the Adirondack Park, New York, USA

Waterbirds ◽  
2014 ◽  
Vol 37 (sp1) ◽  
pp. 76-84 ◽  
Author(s):  
Nina Schoch ◽  
Allyson K. Jackson ◽  
Melissa Duron ◽  
David C. Evers ◽  
Michale J. Glennon ◽  
...  
Keyword(s):  
New York ◽  
Adirondack Park ◽  
Gavia Immer ◽  
Common Loon ◽  
The Common

Specificity of a Black Fly, Simulium euryadminiculum Davies, toward its Host, the Common Loon

1964 ◽  
Vol 96 (6) ◽  
pp. 911-913 ◽  
Author(s):  
J. K. Lowther ◽  
D. M. Wood
Keyword(s):  
Head And Neck ◽  
Host Location ◽  
Herring Gull ◽  
Gavia Immer ◽  
Common Loon ◽  
Black Fly ◽  
Large Numbers ◽  
The Common ◽  
Common Merganser

AbstractThe attraction of large numbers of the ornithophilic black fly, Simulium euryadminiculum Davies, to its host, the common loon, Gavia immer (Brünnich), to the place where the loon skin had been washed, and to a dried museum skin of the loon, is described. The fly was not attracted to museum skins of a pied-billed grebe, common merganser and herring gull. The data suggest a system of olfaction in host location, probably involving volatile, air-borne substances. It is possible that the colour or pattern on the head and neck of the loon serves to attract the fly to this area of the host.

scholarly journals Cues used by the black fly,Simulium annulus, for attraction to the common loon (Gavia immer)

2012 ◽  
Vol 37 (2) ◽  
pp. 359-364 ◽  
Author(s):  
Meggin L. Weinandt ◽  
Michael Meyer ◽  
Mac Strand ◽  
Alec R. Lindsay
Keyword(s):  
Gavia Immer ◽  
Common Loon ◽  
Black Fly ◽  
The Common

The Impact of Mercury Exposure on the Common Loon (Gavia immer) Population in the Adirondack Park, New York, USA

Waterbirds ◽  
2014 ◽  
Vol 37 (sp1) ◽  
pp. 133-146 ◽  
Author(s):  
Nina Schoch ◽  
Michale J. Glennon ◽  
David C. Evers ◽  
Melissa Duron ◽  
Allyson K. Jackson ◽  
...  
Keyword(s):  
New York ◽  
Mercury Exposure ◽  
Adirondack Park ◽  
Gavia Immer ◽  
Common Loon ◽  
The Common ◽  
The Impact
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