Seasonal changes in morphological structuring in a guild of benthic stream fishes

Oecologia ◽  
1984 ◽  
Vol 63 (1) ◽  
pp. 106-109 ◽  
Author(s):  
G. L. Miller
Keyword(s):  
Seasonal Changes ◽  
Stream Fishes ◽  
Benthic Stream

Use of line transect methods to estimate abundance of benthic stream fishes

1995 ◽  
Vol 52 (1) ◽  
pp. 213-222 ◽  
Author(s):  
William E. Ensign ◽  
Paul L. Angermeier ◽  
C. Andrew Dolloff
Keyword(s):  
Distance Sampling ◽  
Line Transect ◽  
Strong Positive Correlation ◽  
Stream Fishes ◽  
Visual Estimation ◽  
Abundance Estimates ◽  
Benthic Stream ◽  
Roanoke Logperch ◽  
Strip Transect ◽  
Stream Salmonid

Visual estimation of stream salmonid abundance using strip transect sighting models has become commonplace. Application of visual estimation to other stream fishes, particularly benthic forms, has been limited. Examination of the distribution of sighting distances for the Roanoke darter (Percina roanoka), Roanoke logperch (P. rex), and black jumprock (Moxostoma cervinum) indicates that strip transect sighting models that assume probability of sighting remaining constant out to the limits of observer visibility are not appropriate for these benthic species. Our datasets indicate that distance sampling models that assume decreased sighting probability with increasing distance of the target from the observer provide a reasonable alternative to strip transect sighting models. There was a strong positive correlation between abundance estimates calculated using two alternative distance sampling models, as well as between the distance sampling model estimates and an estimate of abundance obtained with a backpack electroshocker.

Competitive Interactions Between Benthic Stream Fishes, Riffle Sculpin, Cottus gulosus, and Speckled Dace, Rhinichthys osculus

1982 ◽  
Vol 39 (11) ◽  
pp. 1502-1511 ◽  
Author(s):  
Donald M. Baltz ◽  
Peter B. Moyle ◽  
Ned J. Knight
Keyword(s):  
Low Temperatures ◽  
Swimming Performance ◽  
Competitive Interactions ◽  
Swimming Velocity ◽  
Stream Fishes ◽  
Benthic Stream ◽  
Critical Swimming Velocity ◽  
Rhinichthys Osculus ◽  
Deer Creek ◽  
Speckled Dace

Two morphologically dissimilar stream fishes occupied the same microhabitat in different riffles of Deer Creek, Tehama County, California. In a 12.5 km reach of the creek, speckled dace (Rhinichthys osculus) dominated riffles at the lower end while riffle sculpin (Cottus gulosus) dominated the riffles at the upper end, where dace were confined to slower water. Between these sets of riffles, relative abundances of the two species were negatively correlated. Routine metabolic rates of sculpin increased rapidly with temperature and indicated that sculpins were unable to tolerate temperatures in the low elevation riffles in the summer. Dace swimming performance appeared to be adequate at low temperatures to permit them to occupy the sculpin-dominated riffles. However, stream tank experiments indicated that at low temperatures sculpin were able to displace dace from cover in high velocity water. Our analysis thus demonstrated that competitive interactions between dace and sculpin for preferred microhabitat were mediated by temperature.Key words: competition, critical swimming velocity, experimental stream, microhabitat utilization, routine metabolism

Spreading the Word: Seasonal Changes Mean New Opportunities for Media Coverage

ASHA Leader ◽  
2013 ◽  
Vol 18 (7) ◽  
Keyword(s):  
Media Coverage ◽  
Seasonal Changes ◽  
Swimming Pools

Summer kicking into high gear conjures images of swimming pools and barbeques. But before you book your beach house for the weekend, think about what the changing seasons can mean for you professionally.

Seasonal changes in a ultraviolet structural colour signal in blue tits, Parus caeruleus

2002 ◽  
Vol 76 (2) ◽  
pp. 237-245 ◽  
Author(s):  
JONAS ORNBORG ◽  
STAFFAN ANDERSSON ◽  
SIMON C. GRIFFITH ◽  
BEN C. SHELDON
Keyword(s):  
Seasonal Changes ◽  
Parus Caeruleus ◽  
Structural Colour ◽  
Blue Tits ◽  
Colour Signal

Seasonal changes in nitrogen fractions of Pachysandra terminalis, a forest evergreen chamaephyte

1990 ◽  
Vol 79 (1) ◽  
pp. 7-14 ◽  
Author(s):  
Fumio Yoshie ◽  
Hirohito Arai ◽  
Hideaki Nakashima ◽  
Shoichi Kawano
Keyword(s):  
Seasonal Changes ◽  
Nitrogen Fractions
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