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  • 1
    Electronic Resource
    Electronic Resource
    Correlation of total organic carbon and dry weight data as indices of fresh-water zooplankton biomass (1983)
    Springer
    Hydrobiologia 106 (1983), S. 283-284 
    Details
    ISSN: 1573-5117
    Keywords: total organic carbon ; dry weight ; fresh-water zooplankton ; biomass
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Preserved zooplankters from DeGray Lake, Arkansas, U.S.A., were separated from other net seston by density-gradient centrifugation, washed, dried, and weighed. Total organic carbon (TOC) content of zooplankters was determined from carbon analysis involving wet persulfate oxidation. Dry weight and TOC data were highly correlated (r2 = 0.9649; P 〈 0.001) when subjected to a step-wise procedure of the Statistical Analysis System (SAS). The model is represented by the equation log Y =1.14 log X + 0.46, where X = TOC and Y = dry weight. Carbon averaged 30.33 ± 9.86 (S.D.)% of dry weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00008127
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Digestive anatomy of Halella azteca (Crustacea, Amphipoda) (1983)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 175 (1983), S. 91-100 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The digestive tract of the freshwater amphipod Hyalella azteca is a straight but differentiated tube consisting of foregut, midgut, and hindgut divisions. The foregut is subdivided into a tubular esophagus, a cardiac stomach, and a pyloric stomach. The cuticular lining of the cardiac stomach is elaborated into a set of food-crushing plates and ossicles, the gastric mill, while the pyloric cuticle forms a complex straining and pressing mechanism. Nine caeca arise from the midgut, seven anteriorly and two posteriorly. Four of the anterior caeca, the hepatopancreatic caeca, are believed to be the primary sites of digestion and absorption. The remaining caeca may be absorptive, secretory, or both. The much-folded hindgut wall is capable of great distention by extrinsic muscle action for water intake to aid in flushing fecal material out of the anus; such action also may stimulate antiperistalsis by intrinsic rectal muscles.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051750109
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  • 3
    Electronic Resource
    Electronic Resource
    Anatomy of the extrinsic gut musculature of Gammarus minus (Crustacea: Amphipoda) (1989)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 200 (1989), S. 87-92 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Inserting on the buccal and esophageal foregut of Gammarus minus are numerous pairs of serially arranged dorsal dilator muscles, a single pair of lateral muscles, and two pairs of posterior muscles. Muscles of the cardiac stomach include three dorsal sets, a single pair associated with the pterocardiac ossicles, and two pairs inserting on the ventral aspect. A single pair of muscles inserts on the lateral aspect of the pyloric stomach. The extrinsic muscles of the foregut originate from exoskeletal apodemes of the cephalothoracic cuticle, sockets of the mandible, and a maxillary bridge that lies just ventral to the cardiac stomach. The extrinsic musculature of the hindgut is restricted to the rectal region and consists of paired dorsal and ventral series in an X-configuration. A single unpaired muscle inserts on the ventral midline. Extrinsic muscles of the hindgut originate from the integument of the last pleonic segment. The general arrangement of extrinsic gut muscles in G. minus is similar but not identical to that of other amphipods studied. However, the pattern is quite different from that of other malacostracans.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052000110
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  • 4
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    Correlation of total organic carbon and dry weight data as indices of fresh-water zooplankton biomass (1983)
    Springer
    Details
    Publication Date: 1983-10-01
    Print ISSN: 0018-8158
    Electronic ISSN: 1573-5117
    Topics: Biology
    Published by Springer
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