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  • 1
    Electronic Resource
    Electronic Resource
    PHOSPHORUS ASSIMILATION IN A STREAM SYSTEM OF THE LAKE OKEECHOBEE BASIN (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Water Resources Association 32 (1996), S. 0 
    Details
    ISSN: 1752-1688
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Architecture, Civil Engineering, Surveying , Geography
    Notes: : The ability to predict how streams and wetlands retain phosphorus (P) is critical to the management of watersheds that contribute nutrients to adjacent aquatic systems such as lakes. Field and laboratory experiments were conducted to determine the P assimilatory capacity of a stream (Otter Creek) in the Taylor Creek/Nubbin Slough Basin located north of Lake Okeechobee, Florida. Dominant soils in this basin are sandy Spodosols; landuse is primarily dairy farms and beef cattle pastures. Estimates of P assimilation show that sediments assimilate approximately 5 percent of the P load. Phosphorus assimilation rates in the stream were estimated using first-order relationships based on the total P concentration of the water column as a function of distance from the primary source. This method assumes minimal lateral inputs. Stream lengths required for one turnover in P assimilation were estimated to be in the range of 3–16 km. Laboratory studies using intact sediment cores indicated a P assimilation rate of 0.025 m day−1, and equilibrium P concentration of 0.16 ± 0.03 mg L−1 in the water column. Dissolved P concentration gradients in the sediments showed upward flux of P at water column P concentration of 〈0.16 mg L−1. Approximately 56–77 percent of the P assimilated in the above-ground vegetation during active growth was released or translocated within six months of senesence, suggesting short-term storage in above-ground vegetation. Bottom sediments and recalcitrant detrital plant tissue provide for long-term P assimilation in the creek. Although stream sediments have the potential to adsorb P, high flow rate and low contact period between water and sediment limits this process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1752-1688.1996.tb04061.x
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  • 2
    Electronic Resource
    Electronic Resource
    Allozymic variation and differentiation in naturalized populations of rainbow trout, Oncorhynchus mykiss (Walbaum), from southern Chile (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Aquaculture research 29 (1998), S. 0 
    Details
    ISSN: 1365-2109
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: An allozyme survey was conducted in three naturalized populations of rainbow trout, Oncorhynchus mykiss (Walbaum), from rivers in two Andean lakes of southern Chile. The analysis was based on 32 presumed loci, 10 of which were variable, and revealed that the mean percentage of polymorphic loci (P= 21.8%; range = 15.6-28.1%), the mean number of alleles per locus (n=1.26; range = 1.2-1.3) and the mean observed heterozygosity (HO=7.0%; range = 6.0-8.2%) are high, although within the range reported for rainbow trout. Although the mean genetic distance between the samples was low (D = 0.003), and only 5.2% of the total observed genetic variation can be accounted by interpopulation differences (FST= 0.052), eight out of 10 polymorphic loci exhibited significant allelic heterogeneity. Some loci, notably EST-1*, IDHP-3,4*, MEP-1* and PGM-1*, showed considerable discriminatory capacity among the samples. Rainbow trout has a longer history in Chilean waters since salmonid introduction started earlier this century. Under current intensive farming practices, the preliminary information provided in the present paper is likely to be helpful in setting up a baseline for further characterization and/or monitoring of naturalized populations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2109.1998.tb01104.x
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