Do brook charr (Salvelinus fontinalis) from insular Newfoundland have different parasites than their mainland counterparts?

1991 ◽  
Vol 69 (3) ◽  
pp. 809-811 ◽  
Author(s):  
David J. Marcogliese ◽  
David K. Cone
Keyword(s):  
North America ◽  
Parasite Species ◽  
Salvelinus Fontinalis ◽  
Salmonid Fishes ◽  
Primary Reason ◽  
Brook Charr ◽  
Northeastern North America ◽  
Metazoan Parasite ◽  
The Difference ◽  
Brook Char

Based on the published literature, comparison of the metazoan parasite faunas of brook char (Salvelinus fontinalis) from freshwater localities in northeastern North America reveals that hosts in insular Newfoundland have fewer parasite species recorded from them. Of 45 parasite species or taxa, only 20 are common to the island and the mainland. Twenty-three parasite species have been reported from the mainland but not from the island, with most of the taxa being types common to non-salmonid fishes. Two species, the copepod Ergasilus luciopercarum and the digenean Tetracotyle, have been reported from charr on the island but not from the northeastern mainland. It is suggested that the primary reason for the difference in the structure of the assemblages is the lack of contact brook charr in Newfoundland have with percid, cyprinid, centrarchid, esocid, and catostomid fishes and their parasites.

The taxonomy of Gyrodactylus (Monogenea) parasitizing certain salmonid fishes of North America, with a description of Gyrodactylus nerkae n. sp.

1983 ◽  
Vol 61 (11) ◽  
pp. 2587-2597 ◽  
Author(s):  
D. K. Cone ◽  
M. Beverley-Burton ◽  
M. Wiles ◽  
T. E. McDonald
Keyword(s):  
Nova Scotia ◽  
North America ◽  
Salvelinus Fontinalis ◽  
Oncorhynchus Kisutch ◽  
Vancouver Island ◽  
Type Material ◽  
Salmo Gairdneri ◽  
Salmonid Fishes ◽  
Diagnostic Key ◽  
Salmo Clarki

Specimens of Gyrodactylus Nordmann, 1832, both newly collected and deposited type material, from cultured and wild salmonid fishes from various localities in North America, are compared and five species are recognized: G. salmonis Yin and Sproston, 1948 status emended, on Salmo clarki, S. salar, S. aguabonita, S. gairdneri, S. trutta, Salvelinus fontinalis, S. namaycush, and Oncorhynchus kisutch from several localities throughout the continent; Gyrodactylus nerkae n. sp. on O. nerka from Vancouver Island; G. colemanensis Mizelle and Kritsky, 1967 on Salmo gairdneri from California, Arkansas, and insular Newfoundland, S. fontinalis from Nova Scotia and Ontario, and S. trutta, S. namaycush, and S. fontinalis × S. namaycush from Ontario; G. avalonia Hanek and Threlfall, 1969 on S. gairdneri from Nova Scotia; and G. brevis Crane and Mizelle, 1967 on S. gairdneri from California. Gyrodactylus salmonis, G. nerkae, and G. colemanensis are considered specific to salmonid fishes, whereas G. avalonia and G. brevis are considered "accidental" infections, acquired from nonsalmonid fishes. A diagnostic key to the five species is provided and gyrodactyliasis, as a disease of cultured salmonids in North America, is discussed briefly.

Influence of water temperature on behavioural interactions between juvenile brook charr, Salvelinus fontinalis, and rainbow trout, Salmo gairdneri

1986 ◽  
Vol 64 (6) ◽  
pp. 1288-1291 ◽  
Author(s):  
Richard A. Cunjak ◽  
John M. Green
Keyword(s):  
Rainbow Trout ◽  
Competitive Advantage ◽  
Salvelinus Fontinalis ◽  
Salmo Gairdneri ◽  
Optimal Temperature ◽  
Brook Charr ◽  
Thermal Range ◽  
Influence Of Water ◽  
Behavioural Interactions ◽  
Brook Char

Interspecific behavioural interactions between paired brook char (Salvelinus fontinalis) and rainbow trout (Salmo gairdneri) were compared at different water temperatures to test the hypothesis that a species realizes a competitive advantage within its optimal thermal range. Three test temperatures were used: 19 °C (optimal temperature for rainbow trout), 13 °C (optimal temperature for brook charr), and 8 °C (below the optima for both species). Brook charr dominated rainbow trout at both 8 and 13 °C. At 19 °C, neither species displayed an obvious competitive advantage. The time (days) to the establishment of a dominance hierarchy reflected specific optimal temperatures; it was shortest for rainbow trout and brook charr at 19 and 13 °C, respectively. The implications of optimal temperatures and competitive ability are discussed in relation to habitat partitioning in the stream environment.

Geometry for the eccentric territory

1982 ◽  
Vol 60 (7) ◽  
pp. 1776-1779 ◽  
Author(s):  
David L. G. Noakes ◽  
Richard E. McNicol
Keyword(s):  
Salvelinus Fontinalis ◽  
Concave Side ◽  
Basic Theory ◽  
Salmonid Fishes ◽  
Two Dimensional ◽  
Brook Charr ◽  
Geometric Shapes ◽  
Limiting Case

Basic theory predicts that two-dimensional territories should be circular, but results from stream-dwelling juvenile salmonid fishes appear to deviate consistently from such a shape. We present a model for cardioidal territories based on data from juvenile brook charr (Salvelinus fontinalis) and show that circles can be considered as a limiting case for cardioids. Since they are regular geometric shapes directly related to circles, but with one concave side, cardioids may be useful for some analyses of territorial data.

FABRIC OF THE LITHOSPHERE IN NORTHEASTERN NORTH AMERICA

2019 ◽  
Author(s):  
Yiran Li ◽  
◽  
Vadim Levin ◽  
Zhenxin Xie
Keyword(s):  
North America ◽  
Northeastern North America

Early Maize in Northeastern North America: A Comment on Emerson and Colleagues

2021 ◽  
Vol 86 (2) ◽  
pp. 425-427
Author(s):  
John P. Hart ◽  
William A. Lovis ◽  
M. Anne Katzenberg
Keyword(s):  
North America ◽  
Great Lakes ◽  
Empirical Evidence ◽  
River Valley ◽  
Human Bone ◽  
Northeastern North America ◽  
Isotopic Evidence ◽  
St Lawrence River

Emerson and colleagues (2020) provide new isotopic evidence on directly dated human bone from the Greater Cahokia region. They conclude that maize was not adopted in the region prior to AD 900. Placing this result within the larger context of maize histories in northeastern North America, they suggest that evidence from the lower Great Lakes and St. Lawrence River valley for earlier maize is “enigmatic” and “perplexing.” Here, we review that evidence, accumulated over the course of several decades, and question why Emerson and colleagues felt the need to offer opinions on that evidence without providing any new contradictory empirical evidence for the region.

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