This study had two objectives: (1) to compare seasonal and spatial patterns of water- column diss... more This study had two objectives: (1) to compare seasonal and spatial patterns of water- column dissolved organic carbon (DOC) and sediment interstitial DOC (IDOC) concentrations at a headwater spring seep, and (2) to explore interactions between sediment organic matter content, benthic bacterial biomass and production, water column DOC concentration, and sediment IDOC concentration and composition (high versus low molecular weight
A healthy stream is an ecosystem that is sustainable and resilient, maintaining its eco- logical ... more A healthy stream is an ecosystem that is sustainable and resilient, maintaining its eco- logical structure and function over time while continuing to meet societal needs and expectations. The concept described in this paper explicitly incorporates both ecological integrity (maintaining structure and function) and human values (what society values in the ecosystem). Stream ecologists who want their research to contribute
The response of a stream ecosystem to disturbance in its watershed was investigated by comparing ... more The response of a stream ecosystem to disturbance in its watershed was investigated by comparing mass balances of dissolved organic carbon (DOC) for a stream draining an undisturbed watershed with a stream draining a watershed that was clear-cut 2 yr before the study began. These second-order streams are in the Coweeta Hydrologic Laboratory, North Carolina. Both streams had similar, elevated
Abstract. We discuss elemental dynamics,in streams and seek to identify areas where,there are cri... more Abstract. We discuss elemental dynamics,in streams and seek to identify areas where,there are critical gaps in our understanding. Both landscape-level processes (e.g., geology, land-use practices, vegetation) and heterogeneous,in-stream processes influence the supply and availability of elements to the stream biota. Stream ecologists need to consider the relative availability of different com- pounds,or groups of compounds,to the biota rather than lumping,all
Suspended paniculate matter (seston) and dissolved organic carbon (DOC) were stud- ied along a 6.... more Suspended paniculate matter (seston) and dissolved organic carbon (DOC) were stud- ied along a 6.4-km section of a southern Appalachian headwater stream from July 1978 to August 1979. Samples were collected at six sites encompassing stream orders 1-4 and a 635 m elevation change. Nonstorm concentration of particulate organic matter (POM) measured as ash-free dry mass (AFDM) ranged from 0.53-3.68
Schools of juvenile haemulid fish feed in sea grass beds at night. By day they rest over coral he... more Schools of juvenile haemulid fish feed in sea grass beds at night. By day they rest over coral heads, where they excrete substantial quantities of ammonium and particulate nitrogen and phosphorus into the nutrient-poor waters. The percentages of these nutrients contributed by the fish were comparable to those from other sources. Coral heads with resident fish schools grew faster than those without resident schools, indicating that fish may be more beneficial to the corals than has been assumed.
... 15N-tracer addition Jennifer L. Tank Department of Natural Resources and Environmental Scienc... more ... 15N-tracer addition Jennifer L. Tank Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois ... Bruce J. Peterson and Wilfred M. Wollheim Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts ...
This study had two objectives: (1) to compare seasonal and spatial patterns of water- column diss... more This study had two objectives: (1) to compare seasonal and spatial patterns of water- column dissolved organic carbon (DOC) and sediment interstitial DOC (IDOC) concentrations at a headwater spring seep, and (2) to explore interactions between sediment organic matter content, benthic bacterial biomass and production, water column DOC concentration, and sediment IDOC concentration and composition (high versus low molecular weight
A healthy stream is an ecosystem that is sustainable and resilient, maintaining its eco- logical ... more A healthy stream is an ecosystem that is sustainable and resilient, maintaining its eco- logical structure and function over time while continuing to meet societal needs and expectations. The concept described in this paper explicitly incorporates both ecological integrity (maintaining structure and function) and human values (what society values in the ecosystem). Stream ecologists who want their research to contribute
The response of a stream ecosystem to disturbance in its watershed was investigated by comparing ... more The response of a stream ecosystem to disturbance in its watershed was investigated by comparing mass balances of dissolved organic carbon (DOC) for a stream draining an undisturbed watershed with a stream draining a watershed that was clear-cut 2 yr before the study began. These second-order streams are in the Coweeta Hydrologic Laboratory, North Carolina. Both streams had similar, elevated
Abstract. We discuss elemental dynamics,in streams and seek to identify areas where,there are cri... more Abstract. We discuss elemental dynamics,in streams and seek to identify areas where,there are critical gaps in our understanding. Both landscape-level processes (e.g., geology, land-use practices, vegetation) and heterogeneous,in-stream processes influence the supply and availability of elements to the stream biota. Stream ecologists need to consider the relative availability of different com- pounds,or groups of compounds,to the biota rather than lumping,all
Suspended paniculate matter (seston) and dissolved organic carbon (DOC) were stud- ied along a 6.... more Suspended paniculate matter (seston) and dissolved organic carbon (DOC) were stud- ied along a 6.4-km section of a southern Appalachian headwater stream from July 1978 to August 1979. Samples were collected at six sites encompassing stream orders 1-4 and a 635 m elevation change. Nonstorm concentration of particulate organic matter (POM) measured as ash-free dry mass (AFDM) ranged from 0.53-3.68
Schools of juvenile haemulid fish feed in sea grass beds at night. By day they rest over coral he... more Schools of juvenile haemulid fish feed in sea grass beds at night. By day they rest over coral heads, where they excrete substantial quantities of ammonium and particulate nitrogen and phosphorus into the nutrient-poor waters. The percentages of these nutrients contributed by the fish were comparable to those from other sources. Coral heads with resident fish schools grew faster than those without resident schools, indicating that fish may be more beneficial to the corals than has been assumed.
... 15N-tracer addition Jennifer L. Tank Department of Natural Resources and Environmental Scienc... more ... 15N-tracer addition Jennifer L. Tank Department of Natural Resources and Environmental Sciences, University of Illinois, Urbana, Illinois ... Bruce J. Peterson and Wilfred M. Wollheim Ecosystems Center, Marine Biological Laboratory, Woods Hole, Massachusetts ...
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