New Records and Species of Calanoid Copepods From Saskatchewan and Louisiana

Wilson, Mildred Stratton

doi:10.1139/z58-044

Cited by 14 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It occurs most commonly in arctic tundra pond habitats from Alaska and Yukon to western Hudson Bay (Juday and Muttkowski, 1915;Marsh, 1920;Hooper, 1947;Bardach, 1954;Reed, 1962Reed, , 1963Tash and Armitage, 1967;Tash, 1971). It has been also reported from interior British Columbia (Carl, 1940) and Saskatchewan (Wilson, 1958).…”

mentioning

confidence: 99%

Genetic Consequences of Passive Dispersal in Pond-Dwelling Copepods

Boileau

Hebert

1991

Evolution

View full text Add to dashboard Cite

Abstract. -Pond-dwelling copepods have colonized habitats throughout North America after glaciers have receded. Most species are passively transported via resting eggs into new habitats. Colonists originating in a glacial refugium could lose some of the ancestral genetic diversity when they establish new populations and the attenuation may be substantial in populations far removed from the refugium due to multiple founder events. Genetic variation was measured in Heterocope septentrionalis from 27 populations at arctic sites near potential refugia and those more recently deglaciated to determine the effects of postglacial dispersal on patterns of genetic relatedness and diversity. Some populations were more distant, genetically, from others within the same site than those from other more distant sites. Eleven polymorphic enzyme loci were significantly more variable (F [1,294 dj] = 5.94, P < 0.025) among individuals from populations near the Alaskan refuge than those at the eastern limit of their distribution. Because populations are typically extremely large and stable this loss of genetic diversity is attributed primarily to repeated founder events during colonization. This result suggests profound genetic changes may occur on a continental scale in passively dispersed copepods due to founder events alone. Their potential for divergence and speciation is greater than currently recognized.

show abstract

mentioning

confidence: 99%

Genetic Consequences of Passive Dispersal in Pond-Dwelling Copepods

Boileau

Hebert

1991

Evolution

View full text Add to dashboard Cite

show abstract

“…Such taxa must be considered cautiously, as it is uncertain whether they exist as biologically and genetically cohesive units (Boileau, 1991). For example, H. arcticus is widespread in pond habitats from the Canadian Rockies (Anderson, 1971) as far east as Ungava (Reed, 1959) and from the prairies (Wilson, 1958) to the high arctic (Marsh, 1929) and Siberia (Borutskii et al, 1991). Through allozyme studies, morphological studies and biogeographical analyses, Boileau (1989), established that H. arcticus is composed of three mostly allopatric species, H. arcticus sensu stricto, H. churchillensis and H. nearcticus (the species used in this study).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand, females of several species such as H. arcticus, H. breweri (M.S. Wilson, 1958) and H. kiseri (Kincaid, 1953) are morphologically similar and cannot be reliably assigned to a particular species using the existing data (Scanlin & Reid, 1996). Based upon morphological and molecular data Boileau (1989Boileau ( , 1991 suggested subdividing H. arcticus into three species, which would expand the genus into 20 species.…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of the genus Hesperodiaptomus (Copepoda) based on nucleotide sequence data of the nuclear ribosomal gene

2008

View full text Add to dashboard Cite

The genus Hesperodiaptomus Light, 1938, one of the most diverse groups of freshwater copepods that occur in North and Central America, plays a major role in the food webs of the alpine freshwater communities. Phylogenetic relationships of these taxa remain poorly understood due to difficulties in obtaining reliable morphological characters for phylogenetic analyses. To understand the phylogenetic relationships within this group, we reconstructed a partial phylogeny of the genus Hesperodiaptomus based on nuclear ribosomal gene sequences. Phylogenetic analyses based upon the taxa examined supported the monophyly the genus and revealed two clades. The eiseni clade comprised species that are morphologically similar to Hesperodiaptomus eiseni (Lilljeborg, 1889), and the shoshone clade included species morphologically similar to Hesperodiaptomus shoshone (S.A. Forbes, 1882). The two groups can be distinguished by a modification of the right basis, the arrangement of spinules on the distal pad of the second exopod, and the degree of presence the inner lamellar expansion of the right coxa.

show abstract

“…Its native distribution in North America is widespread (Wilson 1958;Byron & Saunders 1981), but its range has expanded in recent years indicating an ability to spread (e.g., Beavers & Stavn 1975;Byron & Saunders 1981).…”

Section: Diaptomidsmentioning

confidence: 99%