Occurrence of an arctic fairy shrimp Polyartemiella hazeni (Murdoch) 1884 (Crustacea: Anostraca) in Alberta and Yukon Territory

1976 ◽  
Vol 54 (11) ◽  
pp. 2026-2028 ◽  
Author(s):  
Graham R. Daborn
Keyword(s):  
Rainbow Trout ◽  
New Records ◽  
Stomach Contents ◽  
Yukon Territory ◽  
Range Extension ◽  
The Arctic ◽  
Fairy Shrimp ◽  
Single Male

New records are reported for the arctic fairy shrimp Polyartemiella hazeni (Murdoch) 1884 in Yukon Territory and Alberta. The Alberta record, a single male from stomach contents of a rainbow trout, represents a range extension of more than 1600 km, but the population could not be located. Distribution of the species is summarized.

Food Specialization By Individual Trout

1972 ◽  
Vol 29 (11) ◽  
pp. 1615-1624 ◽  
Author(s):  
James E. Bryan ◽  
P. A. Larkin
Keyword(s):  
Rainbow Trout ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Stomach Contents ◽  
Cutthroat Trout ◽  
Salmo Gairdneri ◽  
Potential Prey ◽  
Repeated Observation ◽  
Size Growth ◽  
Salmo Clarki

Analyses of stomach contents showed that the kinds of prey eaten by brook trout (Salvelinus fontinalis), cutthroat trout (Salmo clarki), and rainbow trout (Salmo gairdneri) were seldom distributed at random among the individuals. Repeated observation of food eaten by individuals in a stream and ponds showed that prey types were eaten in proportions which were characteristic for an individual.Specialization occurred on several different kinds of prey. Although the degree of specialization was higher during shorter intervals, the data suggested that some specialization persisted for half a year. There were no striking correlations between degree of specialization and other individual properties such as size, growth rate, weight of food, number of food items, previous specialization, or area of recapture.In addition to the observations on trout in relatively undisturbed habitats, a field experiment was conducted using laboratory-reared rainbow trout held in small ponds. The food of each trout in the experiment was sampled repeatedly. In analysis of variance, interaction among the individuals and kinds of prey eaten showed that food specialization occurred. Both the absolute and relative abundance of potential prey were constant during the experiment.

Changes in Habitat Use and Feeding Chronology of Juvenile Rainbow Trout (Oncorhynchus mykiss) in Fall and the Onset of Winter in Silver Creek, Idaho

1993 ◽  
Vol 50 (10) ◽  
pp. 2119-2128 ◽  
Author(s):  
Michael D. Riehle ◽  
J. S. Griffith
Keyword(s):  
Rainbow Trout ◽  
Habitat Use ◽  
Oncorhynchus Mykiss ◽  
Density Distribution ◽  
Stomach Contents ◽  
Early Morning ◽  
Invertebrate Drift ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss

We assessed changes in density, distribution, and microhabitat of age-0 rainbow trout (Oncorhynchus mykiss) in Silver Creek, a partially spring-fed stream, by periodic snorkeling in August 1987 through January 1988. We examined trout stomach contents and invertebrate drift samples in diel collections in August, September, October, and January to test if the period of feeding shifted from daytime to nighttime, concurrent with a transition to day concealment. In late September, fish aggregated briefly during the day and then began to conceal themselves in macrophyte beds, undercut banks, and submerged sedges and grasses along streambanks as temperature dropped below 8 °C in early October. Fish emerged from concealment at night, and numbers of trout visible were greatest 30–60 min after sunset and about 30 min before sunrise. Periods of peak feeding changed from afternoon and evening in August and September, when fish were day active, to mainly at night in October after the initiation of day concealment. Trout did not feed upon abundant chironomids in the daytime drift in October. In January, fish fed at 1–4 °C on mayflies, and stomachs were fullest in the early morning. Observations suggest that Silver Creek trout experienced a metabolic deficit that began in September.

Life history of tundra-dwelling wolf spiders (Araneae: Lycosidae) from the Yukon Territory, Canada

2012 ◽  
Vol 90 (6) ◽  
pp. 714-721 ◽  
Author(s):  
J.J. Bowden ◽  
C.M. Buddle
Keyword(s):  
Reproductive Effort ◽  
Abiotic Factors ◽  
Wolf Spider ◽  
Local Variation ◽  
Yukon Territory ◽  
The Arctic ◽  
Wolf Spiders ◽  
Female Body Size ◽  
Trade Offs ◽  
History Of

We studied populations of three tundra-dwelling wolf spider (Lycosidae) species to determine reproductive trait relationships and developmental timing in the Arctic. We collected 451 Pardosa lapponica (Thorell, 1872), 176 Pardosa sodalis Holm, 1970, and 117 Pardosa moesta Banks, 1892 during summer 2008. We used log-likelihood ratio tests and multiple linear regressions to determine the best predictors of fecundity and relative reproductive effort. Female body size best explained the variation in fecundity and body condition was the best predictor for relative reproductive effort. We tested for a trade-off between the allocation of resources to individual eggs and the number of eggs produced (fecundity) within each species using linear regression. There was variation in detectable egg size and number trade-offs among sites and these may be related to local variation in resource allocation linked to density-related biotic or abiotic factors. These findings contribute to knowledge about the fitness of arctic wolf spiders in the region of study and are particularly relevant in light of the effects that climate changes are predicted to have on the arctic fauna.

Arctic archaeologies: recent work on Beringia

Antiquity ◽  
2015 ◽  
Vol 89 (345) ◽  
pp. 740-742 ◽  
Author(s):  
Herbert Maschner
Keyword(s):  
Bering Sea ◽  
North Pacific ◽  
Yukon Territory ◽  
The Arctic ◽  
Land Bridge ◽  
Far North ◽  
North East ◽  
Bering Land Bridge ◽  
Last Glaciation ◽  
The Bering Sea

This review considers three books on the archaeology of territories situated around the Bering Sea—a region often referred to as Beringia, adopting the term created for the Late Pleistocene landscape that extended from north-east Asia, across the Bering Land Bridge, to approximately the Yukon Territory of Canada. This region is critical to the archaeology of the Arctic for two fundamental reasons. First, it is the gateway to the Americas, and was certainly the route by which the territory was colonised at the end of the last glaciation. Second, it is the place where the entire Aleut-Eskimo (Unangan, Yupik, Alutiiq, Inupiat and Inuit) phenomenon began, and every coastal culture from the far north Pacific, to Chukotka, to north Alaska, and to arctic Canada and Greenland, has its foundation in the cultural developments that occurred around the Bering Sea.

New records of the mysids Boreomysis nobilis G. O. Sars and Mysis litoralis (Banner) in the Saguenay fjord (St. Lawrence estuary)

1974 ◽  
Vol 52 (8) ◽  
pp. 1087-1090 ◽  
Author(s):  
David C. Judkins ◽  
Robert Wright
Keyword(s):  
New Records ◽  
The Arctic ◽  
Glacial Period ◽  
Isolated Populations ◽  
Lawrence Estuary ◽  
Midwater Trawl ◽  
Boreal Region ◽  
Saguenay Fjord ◽  
St Lawrence Estuary

The arctic–subarctic mysids Boreomysis nobilis and Mysis litoralis were abundant in midwater trawl collections from the Saguenay fjord but were almost absent in collections from the confluent St. Lawrence estuary and Gulf of St. Lawrence. Collections from the estuary and Gulf contained boreal mysids more typical of the latitude. The presence of apparently isolated populations of B. nobilis and M. litoralis in the fjord is further evidence that it is an arctic enclave within a boreal region. The hypothesis that populations of arctic and subarctic species in the Saguenay fjord are relicts from a previous glacial period is questioned in view of the possibility of more recent faunal exchange between the Arctic and the fjord via intermediate arctic enclaves on the eastern Canadian coast.

scholarly journals New records and update on the geographic distribution of the Bonyeared Assfish, Acanthonus armatus Günther, 1878 (Ophidiidae, Neobythitinae), in the Caribbean region

Check List ◽  
2019 ◽  
Vol 15 (5) ◽  
pp. 767-772 ◽  
Author(s):  
Andrea Polanco F. ◽  
Luisa F. Dueñas ◽  
Jorge Leon ◽  
Vladimir Puentes
Keyword(s):  
Geographic Distribution ◽  
Current Distribution ◽  
New Records ◽  
Range Extension ◽  
Caribbean Region ◽  
Continental Coast ◽  
Remote Operate Vehicle ◽  
The Caribbean ◽  
First Time

Acanthonus armatus Günther, 1878 is reported for the first time in the southwestern Caribbean region, off Colombia. Remote Operate Vehicle videos and towed camera still photographs captured 13 images of A. armatus between 2215 and 2564 m. These are the first records of the species in the Caribbean continental coast of Colombia, representing a range extension to the southwestern Caribbean region, since previous records are from the northeastern Caribbean. Some photos of the specimens and the current distribution of the species in the Caribbean region are provided and reviewed.

scholarly journals New records of the snake Leptophis diplotropis (Günther, 1872) (Squamata: Colubridae) from Hidalgo State, México

Check List ◽  
2012 ◽  
Vol 8 (6) ◽  
pp. 1370 ◽  
Author(s):  
Christian Berriozabal-Islas ◽  
Aurelio Ramírez-Bautista ◽  
Luis M. Badillo Saldaña ◽  
Raciel Cruz-Elizalde
Keyword(s):  
New Records ◽  
The State ◽  
Range Extension ◽  
Sierra Madre Oriental ◽  
Sierra Madre ◽  
Northern Regions

We report three new records of the snake Leptophis diplotropis from the southeastern and northern regions of Hidalgo State, México. These records represent the first observations of this species in the state of Hidalgo, and represent a range extension of 122.7 km north from the nearest record in Tochimilco, Puebla, México. These new records of L. diplotropis represent the best knowledge of its distribution in the Sierra Madre Oriental.

scholarly journals New records and range extension of Black-goggled Tanager, Trichothraupis melanops (Vieillot, 1818) (Passeriformes, Thraupidae), in extreme southern Brazil

Check List ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 67-73
Author(s):  
Gustavo Crizel Gomes ◽  
Thales Castilhos de Freitas ◽  
Henrique Noguez da Cunha ◽  
Fernando Jacobs ◽  
Michele Spenst Wall
Keyword(s):  
New Records ◽  
Rio Grande ◽  
Geographic Range ◽  
Range Extension ◽  
Direct Visualization ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Vocal Recognition ◽  
Resident Populations

We describe new records of Trichothraupis melanops in five municipalities of Rio Grande do Sul, Brazil. The birds were detected in sporadic expeditions in the Serra do Sudeste and Campanha Gaúcha regions by direct visualization and vocal recognition. One of these records, next to the border with Uruguay, is the southernmost known location for the species in Brazil. This record expands the geographic range of the species in Brazil south by 170 km. We believe that these occurrences are seasonal displacements and do not represent a colonization front with resident populations.

scholarly journals Range extension for Lacantunia enigmatica Rodiles-Hernández, Hendrickson & Lundberg, 2005 (Siluriformes, Lacantuniidae) in the Usumacinta river basin, Guatemala

Check List ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 161-167 ◽  
Author(s):  
Yasmín Quintana ◽  
Christian Barrientos ◽  
Rocio Rodiles-Hernández
Keyword(s):  
Water Level ◽  
River Basin ◽  
New Records ◽  
Range Extension ◽  
Rio Negro ◽  
First Time

The Lacantun Catfish, Lacantunia enigmatica, is reported for the first time in the Usumacinta river basin in Guatemala. Two specimens were collected in the Usumacinta tributaries Río La Pasión and Río Negro, which are characterized by seasonally fast-flowing deep channels and high fluctuations in water-level. We present a map with new records, and a brief description, and images of the specimens collected.

Trace Metals (As, Cd, Cu, Fe, and Zn) in Arctic cod, Boreogadus saida, and Selected Zooplankton from Strathcona Sound, Northern Baffin Island

1976 ◽  
Vol 33 (12) ◽  
pp. 2836-2840 ◽  
Author(s):  
Arne Bohn ◽  
R. O. McElroy
Keyword(s):  
Body Weight ◽  
Trace Metals ◽  
Stomach Contents ◽  
Bottom Trawl ◽  
The Arctic ◽  
Baffin Island ◽  
Boreogadus Saida ◽  
Arctic Cod ◽  
Planktonic Copepods ◽  
The Difference

Arctic cod (Boreogadus saida) were captured by bottom trawl at depths of 120–300 m. Zooplankton were obtained by bottom to surface tows from the Arctic cod habitat. Average concentrations of arsenic (As) and zinc (Zn) were higher in Arctic cod fillets than in livers from the same fish; cadmium (Cd) and iron (Fe) concentrations were higher in livers. The difference between copper (Cu) concentrations in muscle and liver was not significant. As and Zn in whole fish, and As in fillets from seven specimens, were positively correlated to body weight. Cu and Fe in whole fish were negatively correlated to body weight, whereas Cd was not related to body weight. Examination of Arctic cod stomach contents indicated that planktonic copepods were important in the diet. Cd levels were 5–8 times higher in the unsorted copepods than in the Arctic cod, whereas As, Cu, Fe, and Zn were higher in the fish than in the copepods.

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