Morphological Variation within and among Three Chromosome Races of Sceloporus grammicus (Sauria: Iguanidae) in the North-Central Part of Its Range

Copeia ◽  
1982 ◽  
Vol 1982 (4) ◽  
pp. 920 ◽  
Author(s):  
Jack W. Sites
Keyword(s):  
Morphological Variation ◽  
North Central ◽  
The North ◽  
Chromosome Races ◽  
Sceloporus Grammicus

Morphological variation and status of the orioles, Icterus galbula, I. bullockii, and I. abeillei, in the northern Great Plains and in Durango, Mexico

1973 ◽  
Vol 51 (12) ◽  
pp. 1267-1273 ◽  
Author(s):  
James D. Rising
Keyword(s):  
Great Plains ◽  
Morphological Variation ◽  
Lower Proportion ◽  
Northern Great Plains ◽  
Northern Plains ◽  
Southern Plains ◽  
North Central ◽  
The North ◽  
Climatic Environment

The phenetic affinities of 56 specimens of the orioles Icterus galbula and I. bullockii, and specimens intermediate between them, from the northern Great Plains, are discussed. Phenetically intermediate individuals appear there in lower proportion than they do at most localities in the southern plains, suggesting that there is selection against such individuals in the north. The range of I. galbula seems to be extending southward m the northern plains at the expense of I. bullockii; this is possibly correlated with changes in the climatic environment. I. bullockii and I. abeillei both are uncommon in north-central Durango, Mexico, the only place where they are known to be sympatric.

Distribution and morphological variation of the slimy sculpin (Cottus cognatus) in the north central United States

1990 ◽  
Vol 68 (5) ◽  
pp. 1037-1045 ◽  
Author(s):  
John Lyons
Keyword(s):  
United States ◽  
Great Lakes ◽  
Morphological Variation ◽  
Lake Michigan ◽  
Cottus Cognatus ◽  
North Central ◽  
Driftless Area ◽  
The North ◽  
Small Streams ◽  
Central United States

Slimy sculpins (Cottus cognatus) in the north central United States are found primarily in three areas: Lake Superior and its tributaries, Lake Michigan, and small cold streams in the "Driftless Area" of southwestern Wisconsin, northeastern Iowa, and southeastern Minnesota. In the region between the Driftless Area and the Great Lakes, populations exist only in a few small streams and two small deep lakes, Trout and Big Green. Slimy sculpins from the north central United States display extensive within-population morphological variation. Males and females appear to differ in morphometry (shape) but not in meristics. Patterns of morphological variation among populations have little correspondence to patterns from other parts of the species' range, and do not match predictions based on the likely degree of reproductive isolation among populations. Some morphometric differences are evident among populations in different habitats, primarily because of the distinctiveness of slimy sculpins from Trout and Big Green lakes. Slight clinal differences exist in meristic variables from Great Lakes to Driftless Area populations, although Big Green Lake deviates from the cline. Hybridization with the mottled sculpin (C. bairdi) may contribute to morphological variation within some populations.

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