Taxonomy of Myxobolus ridouti N. Sp. and M. ridgwayi N. Sp. (Myxozoa) from Pimephales notatus and Semotilus atromaculatus (Cypriniformes) in Ontario

2009 ◽  
Vol 95 (6) ◽  
pp. 1446-1450 ◽  
Author(s):  
Russell Easy ◽  
David Cone
Keyword(s):  
Semotilus Atromaculatus ◽  
Pimephales Notatus

Effect of introduced piscivores on native minnow communities in Adirondack lakes

2000 ◽  
Vol 57 (3) ◽  
pp. 570-580 ◽  
Author(s):  
C Scott Findlay ◽  
Daniel G Bert ◽  
Ligang Zheng
Keyword(s):  
Strong Evidence ◽  
Extinction Risk ◽  
Micropterus Salmoides ◽  
Smallmouth Bass ◽  
Micropterus Dolomieu ◽  
Semotilus Atromaculatus ◽  
Rhinichthys Atratulus ◽  
Adirondack Lakes ◽  
Pimephales Notatus ◽  
Creek Chub

We compared the minnow assemblages of Adirondack lakes with top piscivores with those of lakes having similar physiochemical and biotic characteristics but no top piscivores using a subset of data collected from 1984 to 87 by the Adirondack Lake Survey Corporation. Native minnow richness in lakes with top piscivores was about one third that of lakes without piscivores, with piscivore assemblages dominated by introduced species such as northern pike (Esox lucius), largemouth bass (Micropterus salmoides), and smallmouth bass (Micropterus dolomieu). There was strong evidence that at least four minnow species, including creek chub (Semotilus atromaculatus), northern redbelly dace (Phoxinus eos), blacknose dace (Rhinichthys atratulus), and common shiner (Luxilus cornutus), were less likely to occur in lakes with piscivores; for a fifth species (pearl dace (Margariscus margarita)), the evidence is suggestive but not as strong. Of 13 minnow species, only for two nonnative species (bluntnose minnow (Pimephales notatus) and golden shiner (Notemigonus crysoleucas)) was there strong evidence that their occurrence was unaffected by the presence of introduced piscivores. These results add to the growing body of evidence that the introduction of top piscivores to small temperate lakes puts native minnow communities at high extinction risk.

Cyprinid fishes as samplers of benthic diatom communities in freshwater streams of varying water quality

2003 ◽  
Vol 60 (2) ◽  
pp. 117-125 ◽  
Author(s):  
Ted C Rosati ◽  
Jeffrey R Johansen ◽  
Miles M Coburn
Keyword(s):  
Water Quality ◽  
Benthic Diatom ◽  
Diatom Community ◽  
Quality Indices ◽  
Semotilus Atromaculatus ◽  
Freshwater Streams ◽  
Diatom Communities ◽  
Cyprinid Fishes ◽  
Pimephales Notatus ◽  
Composite Samples

The diatom composition of natural substrates in streams of different water qualities was compared among samples collected by researchers and samples collected from the intestine contents of three species of Cyprinid fishes: Campostoma anomalum, Pimephales notatus, and Semotilus atromaculatus. Campostoma and Pimephales were found to be robust samplers that efficiently collected diverse, representative diatom samples. Semotilus were adequate diatom samplers but collected the most diverse samples. In no instance were water-quality indices calculated from Pimephales samples significantly different from human-collected composite samples, whereas Campostoma and Semotilus samples diverged slightly from human-collected composite samples. Internal similarities of fish-collected samples were not significantly higher than those of human-collected samples, indicating that the fish were indiscriminately foraging on diatoms. Furthermore, samples clustered primarily by stream, indicating that fish-collected samples of diatoms were as representative of the stream as those collected by human researchers. By all standards measured in this study, these three fish species sample the benthic diatom community of mid-order streams with a facility equal to that of trained ecologists.

Mechanisms responsible for the niche shift of brook charr, Salvelinus fontinalis Mitchill, when living sympatrically with creek chub, Semotilus atromaculatus Mitchill

1984 ◽  
Vol 62 (8) ◽  
pp. 1548-1555 ◽  
Author(s):  
Pierre Magnan ◽  
Gérard J. FitzGerald
Keyword(s):  
Laboratory Experiments ◽  
Salvelinus Fontinalis ◽  
Niche Shift ◽  
Intraspecific Aggression ◽  
Brook Charr ◽  
Semotilus Atromaculatus ◽  
High Level ◽  
Gill Raker ◽  
Creek Chub ◽  
Study Laboratory

When brook charr, Salvelinus fontinalis Mitchill, are in allopatry in oligotrophic Québec lakes, they feed largely on macrobenthic invertebrates. However, when brook charr cooccur with creek chub, Semotilus atromaculatus Mitchill, they feed largely on zooplankton. In the present study, laboratory experiments showed that creek chub were more effective than brook charr in searching for hidden, patchily distributed prey. The searching efficiency of an individual chub feeding in a group was improved through social facilitation. In contrast, the high level of intraspecific aggression observed in brook charr prevents the formation of such feeding groups. In the laboratory, brook charr were able to displace creek chub from the food source because of interspecific aggression. Data are presented showing that chub are morphologically better adapted than charr to feed on benthos (subterminal orientation of the mouth and protrusible premaxillae), while the charr are better adapted than chub to feed on zooplankton (gill raker structure). Differences in feeding behaviour, morphology, and relative abundance between these species appear to be important in the observed niche shift of brook charr in nature.

scholarly journals Multiple areas of acute vision in two freshwater teleosts, the creek chub, Semotilus atromaculatus (Mitchill) and the cutlips minnow, Exoglossum maxillingua (Lesueur)

1994 ◽  
Vol 72 (4) ◽  
pp. 721-730 ◽  
Author(s):  
Shaun P. Collin ◽  
M. Ather Ali
Keyword(s):  
Ganglion Cell ◽  
Ganglion Cell Layer ◽  
Cell Layer ◽  
Resolving Power ◽  
Retinal Ganglion ◽  
Semotilus Atromaculatus ◽  
Upper Limits ◽  
Close Phylogenetic Relationship ◽  
Creek Chub ◽  
Freshwater Teleosts

The topography of Nissl-stained cells within the retinal ganglion cell layer is examined in two closely related freshwater teleosts from the family Cyprinidae. Regardless of the close phylogenetic relationship and the sympatric habitats of the two species, pronounced differences in the number and position of areas of increased cell density are observed in their retinae. in the creek chub, Semotilus atromaculatus, a midwater crepuscular feeder, three retinal specializations or areae centrales are identified in the dorsonasal, nasal, and temporal regions of the retina. In the cutlips minnow, Exoglossum maxillingua, a benthic diurnal feeder, two areae centrales are identified in temporal and nasal retina. The upper limits of the spatial resolving power of each species are calculated from the spacing of cells within the ganglion cell layer. Differences in the arrangement of isodensity contours appear to reflect the symmetry of each species' visual environment. The development and significance of up to three visually acute zones are discussed.

Growth, maturation, and apparent and absolute fecundity of creek chub, Semotilus atromaculatus (Mitchill), in the Kawartha Lakes Region, Ontario

1977 ◽  
Vol 55 (5) ◽  
pp. 843-846 ◽  
Author(s):  
P. M. Powles ◽  
Douglas Parker ◽  
Ronald Reid
Keyword(s):  
Growth Rate ◽  
Semotilus Atromaculatus ◽  
Absolute Fecundity ◽  
Weight Relationship ◽  
Creek Chub

No difference in growth rate occurred between two study streams, but male creek chub grew more rapidly than females, to a maximum reached at 7 years of age. Walfords were as follows: y = 4.8 TL + 0.810x, females; y = 3.5 TL + 0.792x, males. The length–weight relationship, W = −3.609 + 2.925 log L (TL), derived in the fall, was, as expected, somewhat below the spring relationship from an Illinois study. Kawartha creek chub M50 values were 6.0 TL ± 0.83 cm (males) and 6.54 ± 0.18 cm (females). Relative or apparent fecundity (fall egg count) was F = 71.9 + 136W and total or absolute fecundity (just before spawning) was virtually similar to other areas at F = 61.6 + 91.8W.

ENCAPSULATION OF MYXOBOLUS PENDULA (MYXOSPORIDIA) BY EPITHELIOID CELLS OF ITS CYPRINID HOST SEMOTILUS ATROMACULATUS

2004 ◽  
Vol 90 (6) ◽  
pp. 1401-1405 ◽  
Author(s):  
Anne Koehler ◽  
Patricia Romans ◽  
Sherwin Desser ◽  
Maurice Ringuette
Keyword(s):  
Epithelioid Cells ◽  
Semotilus Atromaculatus
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