scholarly journals Rapid range expansion of rusty crayfish Orconectes rusticus (Girard, 1852) in the John Day River, Oregon, USA

2012 ◽  
Vol 7 (2) ◽  
pp. 291-294 ◽  
Author(s):  
Keith Sorenson ◽  
Stephen Bollens ◽  
Tim Counihan
Keyword(s):  
Range Expansion ◽  
Orconectes Rusticus ◽  
Rusty Crayfish ◽  
John Day River ◽  
John Day

scholarly journals Range expansion of the invasive rusty crayfish Orconectes rusticus (Girard, 1852) (Decapoda: Astacoidea) in northeastern Iowa (USA) rivers

2016 ◽  
Vol 36 (1) ◽  
pp. 99-104 ◽  
Author(s):  
Mauricio Leon ◽  
David A. McCullough ◽  
Audrey Cooper ◽  
Peter B. Berendzen ◽  
Allison A. Dreyer ◽  
...  
Keyword(s):  
Range Expansion ◽  
Orconectes Rusticus ◽  
Rusty Crayfish

Assessing covariability among populations in the presence of intraseries correlation: Columbia River spring-summer chinook salmon (Oncorhynchus tshawytscha) stocks

2000 ◽  
Vol 57 (3) ◽  
pp. 616-627 ◽  
Author(s):  
Louis W Botsford ◽  
Charles M Paulsen
Keyword(s):  
Chinook Salmon ◽  
Degrees Of Freedom ◽  
Oncorhynchus Tshawytscha ◽  
Columbia River ◽  
Data Types ◽  
Natural Logarithm ◽  
Different Types ◽  
John Day River ◽  
One Year ◽  
John Day

We assessed covariability among a number of spawning populations of spring-summer run chinook salmon (Oncorhynchus tshawytscha) in the Columbia River basin by computing correlations among several different types of spawner and recruit data. We accounted for intraseries correlation explicitly in judging the significance of correlations. To reduce the errors involved in computing effective degrees of freedom, we computed a generic effective degrees of freedom for each data type. In spite of the fact that several of these stocks have declined, covariability among locations using several different combinations of spawner and recruitment data indicated no basinwide covariability. There was, however, significant covariability among index populations within the three main subbasins: the Snake River, the mid-Columbia River, and the John Day River. This covariability was much stronger and more consistent in data types reflecting survival (e.g., the natural logarithm of recruits per spawner) than in data reflecting abundance (e.g., spawning escapement). We also tested a measure of survival that did not require knowing the age structure of spawners, the ratio of spawners in one year to spawners 4 years earlier. It displayed a similar spatial pattern.

Effects of water velocity on the size and shape of rusty crayfish, Orconectes rusticus

2013 ◽  
Vol 32 (4) ◽  
pp. 1398-1409 ◽  
Author(s):  
William L. Perry ◽  
Anthony M. Jacks ◽  
Daniel Fiorenza ◽  
Madeleine Young ◽  
Richard Kuhnke ◽  
...  
Keyword(s):  
Water Velocity ◽  
Orconectes Rusticus ◽  
Rusty Crayfish ◽  
Size And Shape
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