The relation of geographical variation in song to habitat characteristics and body size in north American Tanagers (Thraupinae: Piranga)

1983 ◽  
Vol 12 (1) ◽  
pp. 71-76 ◽  
Author(s):  
Eyal Shy
Keyword(s):  
Body Size ◽  
North American ◽  
Geographical Variation ◽  
Habitat Characteristics

scholarly journals Geographical variation in relationships between parental body size and offspring phenotype at birth

2006 ◽  
Vol 85 (9) ◽  
pp. 1066-1079 ◽  
Author(s):  
Sam Leary ◽  
Caroline Fall ◽  
Clive Osmond ◽  
Hermione Lovel ◽  
Doris Campbell ◽  
...  
Keyword(s):  
Body Size ◽  
Geographical Variation

Altered body size distributions in a large river fish community enriched by sewage

2002 ◽  
Vol 59 (5) ◽  
pp. 819-828 ◽  
Author(s):  
Adrian M.H deBruyn ◽  
David J Marcogliese ◽  
Joseph B Rasmussen
Keyword(s):  
Body Size ◽  
Upper Bound ◽  
Fish Community ◽  
Local Variation ◽  
Large River ◽  
Habitat Characteristics ◽  
Size Distributions ◽  
Treated Sewage ◽  
Energetic Constraints ◽  
River Fish

We used two approaches (interspecific upper bound and normalized biomass spectrum, NBS) to study size distributions in a littoral fish community across a natural gradient of epiphytic primary production and at sites enriched by primary-treated sewage. The upper bound of the interspecific density – body size relationship supported universal energetic constraints on the regional assemblage but revealed substantial variation in size distributions at a local scale. Multivariate analysis of the modes composing the NBS suggested possible mechanisms for this local variation in size distributions. Only the largest organisms had higher densities at higher levels of productivity. Densities of smaller organisms could be explained by a combination of habitat characteristics and feeding interactions.

The genes TR, Ost, ProR, and L in natural populations of Melanoplus sanguinipes

1983 ◽  
Vol 25 (2) ◽  
pp. 88-92 ◽  
Author(s):  
W. Chapco
Keyword(s):  
Lactic Acid ◽  
Linkage Disequilibrium ◽  
North American ◽  
Geographical Variation ◽  
Natural Populations ◽  
Melanoplus Sanguinipes ◽  
Lactic Acid Dehydrogenase ◽  
Acid Dehydrogenase

Several North American populations of the migratory grasshopper, Melanoplus sanguinipes (F.), were screened for variation at the loci, TR, Ost, ProR, and L; these are associated, respectively, with tibiae color, femoral stripe, pronotum color, and lactic acid dehydrogenase allozymes (LDH). The most common LDH allele, L2, is uniformly frequent over all sites; TR and Ost show considerable geographical variation, while allele, ProR, is rare or absent in all sampled areas. There is very little evidence of linkage disequilibrium between pairs of loci.

A new, diminutive species ofCatopsalis(Mammalia, Multituberculata, Taeniolabidoidea) from the early Paleocene of southwestern Alberta, Canada

2018 ◽  
Vol 92 (5) ◽  
pp. 896-910
Author(s):  
Craig S. Scott ◽  
Anne Weil ◽  
Jessica M. Theodor
Keyword(s):  
New Species ◽  
Body Size ◽  
Body Mass ◽  
North American ◽  
Phylogenetic Position ◽  
Early Paleocene ◽  
Body Sizes ◽  
History Of ◽  
American Clade ◽  
A New Species

AbstractMultituberculates were among the most taxonomically diverse mammals of the early Paleocene, having survived the catastrophic Cretaceous-Paleogene mass extinction and radiating soon thereafter. Although their evolution during the early Paleocene saw the advent of increasingly specialized dentitions, multituberculates generally remained small, rarely exceeding body sizes greater than those of extant rabbits. A conspicuous exception is the Taeniolabidoidea, a primarily North American clade whose members include the largest multituberculates yet discovered. Taeniolabidoidea includes several genera, with one of these,Catopsalis, being speciose and geographically wide ranging. Until recently, the chronological succession ofCatopsalisappeared to document a trend of increasing body size. We report here on a new species ofCatopsalisfrom the early Paleocene of Alberta that violates this trend and suggests that the evolutionary history ofCatopsalisis considerably more complex.Catopsalis kakwanew species is not only the smallest species ofCatopsalis, but is the smallest taeniolabidoid so far discovered, with an estimated body mass between 400 g and 660 g. In contrast to previous studies, we used recently proposed regressions based on lower cheek tooth row length to estimate body masses for North American taeniolabidoids. Our results propose more modest body mass estimates, particularly for the largest taeniolabidoids. The occurrence ofC.kakwan. sp. in the late early Paleocene implies either a significant ghost lineage, or reversal of several characters, including body size, during the latter part of the early Paleocene; the more likely of these scenarios must await a better understanding of the phylogenetic position ofC.kakwan. sp.UUID:http://zoobank.org/66d85345-49b8-4a46-ba6e-a4d4369cb3e0urn:lsid:zoobank.org:pub:AF7A5659-9068-4F2F-A6EC-5522A2BBA4CB

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