Geographic Variation in the Lateral Line Scale Counts of the Arctic Grayling, Thymallus arcticus

1971 ◽  
Vol 28 (5) ◽  
pp. 749-754 ◽  
Author(s):  
P. McCart ◽  
V. A. Pepper
Keyword(s):  
Geographic Variation ◽  
Lateral Line ◽  
The Arctic ◽  
North Slope ◽  
Lateral Line Scale ◽  
High Count ◽  
Arctic Grayling ◽  
The North ◽  
Line Scale ◽  
Thymallus Arcticus

An examination of Arctic grayling (Thymallus arcticus) collected on either side of the continental divide (Brooks Range) in Alaska revealed that lateral line scale counts were significantly higher on the North Slope than in the Yukon Basin to the south. An examination of geographic variation in this character within the North American range of the species suggested a division into three geographic areas: an area of uniformly low mean counts in the Bering Sea–North Slope of Alaska; an area of uniformly high counts in the remainder of Alaska and parts of the Yukon Territory and British Columbia; an area of variable mean counts in the Northwest Territories. Only two glacial refugia need be postulated to explain this pattern if it is assumed that populations in the first and last of these areas have a similar Mississippian origin and the high count populations a Beringian origin.

scholarly journals Comparison of Lateral Line Scale Counts on Arctic Grayling From Yellowstone National Park and Montana

1978 ◽  
Vol 2 ◽  
pp. 147-149
Author(s):  
William Gould
Keyword(s):  
Lateral Line ◽  
Yellowstone National Park ◽  
National Park ◽  
Lateral Line Scale ◽  
Arctic Grayling ◽  
Line Scale ◽  
Thymallus Arcticus

Arctic grayling (Thymallus arcticus ) are presently absent from areas they formerly inhabited in Yellowstone National Park. A project has been begun to re-establish this species in areas of the Park within its former range. The purpose of this portion of the study was to examine the meristic characteristics of populations of Arctic grayling from Y.N.P. and Montana. The results of this work and those from the electrophoretic examination will provide information for the collection of stocks to be used for the restoration of Arctic grayling in areas of Y.N.P.

Late Pleistocene fish fossils of Coregonus, Stenodus, Thymallus, Catostomus, Lota, and Cottus from the Old Crow basin, northern Yukon, Canada

1981 ◽  
Vol 18 (11) ◽  
pp. 1740-1754 ◽  
Author(s):  
Stephen L. Cumbaa ◽  
Don E. McAllister ◽  
Richard E. Morlan
Keyword(s):  
North America ◽  
Geographic Variation ◽  
Glacial Refugia ◽  
Yukon Territory ◽  
The Arctic ◽  
Arctic Grayling ◽  
Thymallus Arcticus ◽  
Freshwater Sculpin ◽  
Longnose Sucker ◽  
First Time

Fossils of the broad whitefish, Coregonus nasus; the inconnu, Stenodus leucichthys; the longnose sucker, Catostomus catostomus; and the burbot, Lota lota, are reported for the first time from North America and a freshwater sculpin, Cottus, for the first time from Yukon Territory. The known fossil occurrence of the Arctic grayling, Thymallus arcticus, in North America is extended from 32 000 to about 60 000 years BP. These six fossils represent about one sixth of the present-day Yukon freshwater ichthyofauna of 35 species.These fossils provide a major test for the method of determining glacial refugia based on geographic variation of morphological or protein characters. They confirm that these taxa were present prior to and presumably survived the Wisconsinan glaciation in a Beringian refugium.The occurrence of these fossils, all subarctic or subarctic–boreal species known at present in the same area, does not suggest a paleoenvironment greatly different from the present one.

scholarly journals On a new species of the genus Moenkhausia Eigenmann (Ostariophysi: Characidae)

Zootaxa ◽  
2007 ◽  
Vol 1525 (1) ◽  
pp. 61-68 ◽  
Author(s):  
PAULO H.F. LUCINDA ◽  
LUIZ R. MALABARBA ◽  
RICARDO C. BENINE
Keyword(s):  
New Species ◽  
Distribution Pattern ◽  
Lateral Line ◽  
The Body ◽  
Dark Spot ◽  
Lateral Line Scale ◽  
Caudal Fin ◽  
Body Side ◽  
Line Scale ◽  
A New Species

A new species of the genus Moenkhausia is described from the middle portions of the Rio Tocantins and tentatively from the Rio Apure in Venezuela, Rio Orinoco drainage. It is diagnosed by the presence of a dark spot in the half proximal length of the upper caudal-fin lobe, and by the presence of a large, irregularly shaped humeral spot located above the sixth to ninth perforated lateral line scale which is more posteriorly positioned along the body side in relation to other members of the genus. The distribution pattern of the new species is discussed.

scholarly journals The influence of local oil exploration and regional wildfires on summer 2015 aerosol over the North Slope of Alaska

2018 ◽  
Vol 18 (2) ◽  
pp. 555-570 ◽  
Author(s):  
Jessie M. Creamean ◽  
Maximilian Maahn ◽  
Gijs de Boer ◽  
Allison McComiskey ◽  
Arthur J. Sedlacek ◽  
...  
Keyword(s):  
Cloud Microphysics ◽  
Department Of Energy ◽  
The Arctic ◽  
North Slope ◽  
The North ◽  
The Us ◽  
Range Transport ◽  
North Slope Of Alaska ◽  
Atmospheric Radiation Measurement ◽  
Arctic Atmosphere

Abstract. The Arctic is warming at an alarming rate, yet the processes that contribute to the enhanced warming are not well understood. Arctic aerosols have been targeted in studies for decades due to their consequential impacts on the energy budget, both directly and indirectly through their ability to modulate cloud microphysics. Even with the breadth of knowledge afforded from these previous studies, aerosols and their effects remain poorly quantified, especially in the rapidly changing Arctic. Additionally, many previous studies involved use of ground-based measurements, and due to the frequent stratified nature of the Arctic atmosphere, brings into question the representativeness of these datasets aloft. Here, we report on airborne observations from the US Department of Energy Atmospheric Radiation Measurement (ARM) program's Fifth Airborne Carbon Measurements (ACME-V) field campaign along the North Slope of Alaska during the summer of 2015. Contrary to previous evidence that the Alaskan Arctic summertime air is relatively pristine, we show how local oil extraction activities, 2015's central Alaskan wildfires, and, to a lesser extent, long-range transport introduce aerosols and trace gases higher in concentration than previously reported in Arctic haze measurements to the North Slope. Although these sources were either episodic or localized, they serve as abundant aerosol sources that have the potential to impact a larger spatial scale after emission.

Outreach and disseminations activities in North Slope of Alaska: how to build trust between local communities and arctic researchers

2020 ◽  
Author(s):  
Kaare Sikuaq Erickson ◽  
Donatella Zona ◽  
Marco Montemayor ◽  
Walter Oechel ◽  
Terenzio Zenone
Keyword(s):  
Common Ground ◽  
Local Community ◽  
Local Communities ◽  
The Arctic ◽  
North Slope ◽  
Science Fair ◽  
Methane Cycle ◽  
The North ◽  
North Slope Of Alaska ◽  
The University

<p>The Alaskan Ukpeaġvik Iñupiat Corporation (UIC) is promoting and financilally supporting, with the contribution of the US National Science Foundation (NSF) and local organizations, outreach and dissemination events, in the form of science fair for the local communities in North Slope of Alaska. The science fair is part of a larger effort by UIC Science to bring coordination and collaboration to science outreach and engagement efforts across Arctic Alaska. The purpose is to provide a positive space for Arctic researchers and Arctic residents to meet, eat with each other, spend time, and to inspire the youth of the Arctic by providing fun and educational activities that are based in science and traditional knowledge. The Science Fair 2019 hosted by the Barrow Arctic Research Center (BARC) included three days of youth and family-friendly activities related to “Inupiat Knowledge about Plants” led by the College Inupiat Studies Department, “Eco-chains Activity” hosted by the North Slope Borough Office of Emergency Management, “Big Little World: Bugs Plants, and Microscopes” hosted by the National Ecological Observatory Network, “Microplastics in the Arctic” hosted by the North Slope Borough Department of Wildlife Management, “BARC Scavenger Hunt” hosted by UIC Science, “Our Role in the Carbon and Methane Cycle” hosted by the University of Texas El Paso (UTEP) and San Diego State University, and “How Permafrost Works” hosted by the University of Alaska, Fairbanks, Geophysical Institute. Each day hundreds of students, from both the local community and the science community came together to take part in mutually beneficial engagement: students from Utqiaġvik were excited about science and now know of the realistic and fulfilling careers in research that takes place in their backyard. The Utqiaġvik community members and elders now have a better idea of the breadth of research that takes place in and near their home. The locals, especially the elders, are very concerned about the drastic changes in our environment: scientists share these concerns, and the discussions during the fair was a chance to recognize this common ground. Breaking the ice between Arctic researchers and residents can lead to endless opportunities for collaboration, sharing ideas, and even lifelong friendships.</p><p> </p><p> </p>

A new syntopic species of small barb from the Western Ghats of India (Teleostei: Cyprinidae)

Zootaxa ◽  
2018 ◽  
Vol 4434 (3) ◽  
pp. 529 ◽  
Author(s):  
UNMESH KATWATE ◽  
PRADEEP KUMKAR ◽  
RAJEEV RAGHAVAN ◽  
NEELESH DAHANUKAR
Keyword(s):  
New Species ◽  
Lateral Line ◽  
Western Ghats ◽  
Lateral Line Scale ◽  
Dorsal Fin ◽  
Line Scale ◽  
Mitochondrial Cytochrome B ◽  
Western Ghats Of India ◽  
The Western Ghats ◽  
Pelvic Fin

A new species of the cyprinid genus Pethia is described from the Hiranyakeshi, a tributary of the Krishna River system in the Western Ghats mountain ranges of peninsular India. The new species, Pethia sahit, is syntopic—and shoals together—with Pethia longicauda, a species described recently from the same river. Pethia sahit is distinguished from P. longicauda and its congeners by a combination of characters like, incomplete lateral line with 3–6 pored scales; 19–22 scales in lateral series; 4½ scales between dorsal-fin origin and lateral-line row and 2½ scales between lateral line row and pelvic-fin origin; intercalated scale row originates above and after the 6th scale of the lateral-line scale row; dorsal fin originating behind the pelvic-fin origin; 4+13 abdominal and 12 caudal vertebrae; dorsal, pectoral, pelvic, anal and caudal fins without any bands or spots, deep yellow-orange in color or deep red with a pale tint of orange in mature males; a dark-black vertically elongate humeral spot, overlapping the 4th lateral-line scale, extending over the base of one scale above and below the 4th scale; caudal peduncle spot dark, covering 14th–16th scales in lateral-line scale row. Genetic analysis based on the mitochondrial cytochrome b gene indicates that P. sahit and P. longicauda are not sister taxa. Further, P. sahit has no genetically proximate congener in the Western Ghats region, and differs from known congeners from south and southeast Asia, for which genetic data are available, with genetic distance ranging from 11.8–16.4%. 

scholarly journals Planning Oil Spill Response Tactics for Offshore Production Islands

1999 ◽  
Vol 1999 (1) ◽  
pp. 1163-1166
Author(s):  
Michael Bronson ◽  
Thomas Chappie ◽  
Larry Dietrick ◽  
Ronald Hocking ◽  
James McHale
Keyword(s):  
Oil Spill ◽  
Oil Recovery ◽  
Oil Production ◽  
Open Water ◽  
Regulatory Approval ◽  
The Arctic ◽  
North Slope ◽  
The North ◽  
Offshore Production ◽  
Offshore Oil Production

ABSTRACT In anticipation of the Beaufort Sea's first two offshore production islands, Alaska's North Slope oil producers recently expanded their oil spill recovery tactical plans and equipment. To seek regulatory approval for offshore oil production, industry responders joined agency regulators and made plans to clean up as much as 225,000 barrels of oil from potential blowouts over 15 days. Response technicians are configuring new and existing skimmers, vessels, and barges on the North Slope to implement those planning standards. This paper outlines the oil spill tactical plans and equipment that Alaska's North Slope oil industry recently assembled in seeking regulatory approval for the first offshore production islands in the Arctic. The operators of North America's largest oil fields are beginning the first production from oil wells separated from roads and most spill response vessels. For example, the new Badami production pad lies on the Arctic coast more than 25 miles from the Prudhoe Bay facilities, across river courses and roadless tundra. Eight miles of ice-infested sea will separate the proposed Northstar and Liberty production islands from response vessel berths. The new fields regularly experience waves, cold, and ice invasions that constrain oil recovery efforts. Yet regulatory approval to begin oil production requires that the industry have plans and equipment to clean up all the oil that may enter open water, even from the largest spills, within 72 hours.

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