Home About us Contact
|
Home About us Contact | ||
|
|
||
June Sucker (june + sucker)
Selected AbstractsOntogenetic diet shift in the June sucker Chasmistes liorus (Cypriniformes, Catostomidae) in the early juvenile stageECOLOGY OF FRESHWATER FISH, Issue 3 2010J. D. Kreitzer Kreitzer JD, Belk MC, Gonzalez DB, Tuckfield RC, Shiozawa DK, Rasmussen JE. Ontogenetic diet shift in the June sucker Chasmistes liorus (Cypriniformes, Catostomidae) in the early juvenile stage. Ecology of Freshwater Fish 2010: 19: 433,438. © 2010 John Wiley & Sons A/S Abstract,,, Ontogenetic diet shifts are common in fishes and often occur during early life stages. The larval and early juvenile period is critical in the life cycle of the endangered June sucker, Chasmistes liorus (Teleostei: Catostomidae). High larval and juvenile mortality leads to low recruitment to the breeding population and hence a declining natural population. To understand diet composition and dynamics in June sucker at early life stages, diet was quantified and compared to available food items in the natural environment during the early juvenile stage. Rotifers (Brachionus sp.) were the primary diet item at week 10, but by week 12 a small cyclopoid copepod (Microcyclops rubellus) became predominant. Availability of diet items varied little across the experimental period. The increase in size of young suckers may explain this rapid dietary shift, but there are some inconsistencies with the size selection argument. This diet shift represents an important nutritional change that should be considered in development of diets for young June sucker and in assessing suitability of nursery habitats. [source] A review of the comparative morphology and systematics of Utah Lake suckers (Catostomidae)JOURNAL OF ZOOLOGY, Issue 3 2001A. Gaylon Cook Abstract Utah Lake, Utah, U.S.A. harbours an endemic catostomid fish, the June sucker Chasmistes liorus, that is recognized as being endangered. Since 1981, post-1935 representatives of the June sucker have generally been considered to be examples of a self-propagating hybrid. Utah Lake has contained another endemic catostomid, the webug sucker Chasmistes fecundus that was regarded as a true species until 1981 when it was judged to be an extirpated sterile hybrid. Since then, fisheries biologists have not attempted to identify it. This review makes a comparative examination of the published descriptions of the internal and external anatomy of these two species, plus the third catostomid of Utah Lake, the Utah sucker Catostomus ardens. The Utah sucker purportedly crossed with a form of the June sucker that has supposedly since been expunged, to produce hybrids. On the basis of comparative morphology and the consideration of temporal changes in the habitat and piscifauna of Utah Lake, the authenticity of supposed hybridism in the webug sucker, and in the contemporary June sucker, is analysed. The conclusion is reached that there is insufficient evidence to deem these taxa hybrids, or the webug sucker, extinct. [source] PRIMER NOTE: Microsatellite markers for the June sucker (Chasmistes liorus mictus), Utah sucker (Catostomus ardens), and five other catostomid fishes of western North AmericaMOLECULAR ECOLOGY RESOURCES, Issue 3 2007B. L. CARDALL Abstract We developed and optimized five new microsatellite markers for the genetic management of the endangered June sucker. We report the cross-amplification of these markers, and seven microsatellites previously developed for Klamath Basin suckers, in seven catostomid species of western North America. No linkage disequilibrium was detected between pairs of loci. Since most of these loci exhibited conserved priming sites, they may be useful for landscape-scale studies of speciation and patterns of gene flow among multiple sucker lineages. [source] | ||||||||||