. The Canadian field-naturalist. 450 The Canadian Field-Naturalist Vol. 107. Figure 4. Canadian distribution of the Striped Shiner, Luxilus chrysocephalus. em part of its range where it may be found along shore areas (Smith 1985). It is common in lowland streams and weedy shoreline areas of Lake Ontario (Grossman and Van Meter 1979). Based on distributional patterns of Striped Shiners and Common Shiners, Gilbert (1961, 1964) pro- posed that they occupy ecologically distinct habitat. He observed that in areas where they occur sym- patrically, the Common Shiner tends to occupy headwaters and the
. The Canadian field-naturalist. 450 The Canadian Field-Naturalist Vol. 107. Figure 4. Canadian distribution of the Striped Shiner, Luxilus chrysocephalus. em part of its range where it may be found along shore areas (Smith 1985). It is common in lowland streams and weedy shoreline areas of Lake Ontario (Grossman and Van Meter 1979). Based on distributional patterns of Striped Shiners and Common Shiners, Gilbert (1961, 1964) pro- posed that they occupy ecologically distinct habitat. He observed that in areas where they occur sym- patrically, the Common Shiner tends to occupy headwaters and the Striped Shiner usually lives near- er the stream mouth, suggesting that the latter prefers warmer slower water. Radforth (1944) thought that the northern limit of distribution for the Striped Shiner bore some relationship to the 21 °G (70°F) July isotherm. Common Shiner distributional limits roughly conformed to the 18°C (65°F) July isotherm, inferring that Common Shiners are able to tolerate colder mean temperatures or are capable of breeding at a lower minimum temperature. Evidence of higher lethal temperature tolerance for Striped Shiner was presented by Hart (1952), but the study specimens were taken from different geograph- ic areas (Striped Shiner from Kentucky, Common Shiner from Toronto). Kott et al. (1980), however, found no significant difference in thermal tolerance between syntopic populations of the two species in the Grand River, southwestern Ontario. Additionally, more recent collections have expanded the known range of the Striped Shiner beyond that which corre- sponds to these isothermal boundaries. Intensive sampling along the Grand River determined that both forms were well established and occur syntopically along its entire length (Mackay 1983). General Biology Reproductive Capability Spawning habits of the Striped Shiner are extremely similar to those of the Common Shiner. Observations of Common Shiners spawning in New York state are documented by Rane
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