Environmental Correlates, Plasticity, and Repeatability of Differences in Performance among Blacknose Dace (Rhinichthys atratulus) Populations across a Gradient of Urbanization

2008 ◽  
Vol 81 (1) ◽  
pp. 25-42 ◽  
Author(s):  
Jay A. Nelson ◽  
Portia S. Gotwalt ◽  
Christopher A. Simonetti ◽  
Joel W. Snodgrass
Keyword(s):  
Environmental Correlates ◽  
Rhinichthys Atratulus ◽  
Blacknose Dace

Redescription of Myxobolus rhinichthidis (Myxosporea) parasitizing Rhinichthys cataractae, with a revised taxonomic list of species of Myxobolus known from North American freshwater fishes

1995 ◽  
Vol 52 (S1) ◽  
pp. 7-12 ◽  
Author(s):  
David K. Cone ◽  
Richard L. Raesly
Keyword(s):  
North America ◽  
Connective Tissue ◽  
Freshwater Fishes ◽  
Front View ◽  
Spore Size ◽  
Rhinichthys Cataractae ◽  
Rhinichthys Atratulus ◽  
Large Round ◽  
Blacknose Dace ◽  
Formalin Fixed

Myxobolus rhinichthidis Fantham, Porter and Richardson, 1939 (Myxosporea) is redescribed from longnose dace (Rhinichthys cataractae) in Maryland. Large round plasmodia occurred in the connective tissue of the skin covering the head and opercular regions. Fixed spores are oval in front view and measure 11.5–14.5 μm long, 9.0–10.5 μm wide, and 6.0–7.0 μm thick. The polar capsules are 5.5–7.0 μm long and 3.0–3.5 μm wide. Photomicrographs of formalin-fixed spores document variation in spore size and shape. The report is the first for M. rhinichthidis since the species was described from blacknose dace (Rhinichthys atratulus) in Quebec. An updated list of species of Myxobolus Bütschli, 1882 reported from freshwater fishes in North America is provided. Myxobolus jahnricei Landsberg and Lom, 1991 is considered a junior synonym of Myxobolus filamentus Grinham and Cone, 1990; and Myxobolus lii Desser, 1993 and Myxobolus gibbosus Li and Desser, 1985 are junior synonyms of Myxobolus uvuliferus Cone and Anderson, 1977.

In situ Bioassays of Brook Trout (Salvelinus fontinalis) and Blacknose Dace (Rhinichthys atratulus) in Adirondack Streams Affected by Episodic Acidification

1993 ◽  
Vol 50 (5) ◽  
pp. 902-912 ◽  
Author(s):  
Howard A. Simonin ◽  
Walter A. Kretser ◽  
Dale W. Bath ◽  
Mark Olson ◽  
James Gallagher
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Fish Mortality ◽  
Variable Model ◽  
Poor Water Quality ◽  
Rhinichthys Atratulus ◽  
Blacknose Dace ◽  
In Situ Bioassays ◽  
Precipitation Events

In situ bioassays were conducted using native Adirondack brook trout (Salvelinus fontinalis) and blacknose dace (Rhinichthys atratulus) in four headwater streams. Conductivity, pH, temperature, and stage height were monitored continuously, and water samples for laboratory analysis were collected during hydrologic episodes. Fish survived well during baseflow conditions, but during periods of spring snowmelt or large precipitation events, survival was poor. Blacknose dace were more sensitive than brook trout, and mortality was best correlated with the log of median inorganic monomeric aluminum (Alim) concentration. Brook trout mortality was best correlated with a two-variable model that included dissolved organic carbon (DOC) and a concentration–duration variable (median Alim during the episode times the duration of the episode). Brook trout mortality was inversely correlated with DOC. Bioassay fish that had been in the streams 15–24 d survived episodes better than fish that had either not become acclimatized or recovered from handling. Duration of exposure to acidic episodes was critical. Extended periods of poor water quality resulted in fish mortality and may be more important to native populations than short acidic episodes.

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