Periphyton Response to Longitudinal Nutrient Depletion in a Woodland Stream: Evidence of Upstream-Downstream Linkage

Mulholland, Patrick J.; Rosemond, Amy D.

doi:10.2307/1467561

Cited by 85 publications

(51 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, our results differ from those of Peters [1994] The results presented here support the findings of previous studies in WB. Nutrient mass balances computed at monthly intervals across a 140-m segment showed large net uptake of inorganic N and P during the autumn, winter, and spring and net release during summer [Mulholland, 1992] Sharp longitudinal declines in SRP concentrations downstream from large springs in WB, presumably due to biological uptake, were observed during autumn and spring but were absent in summer [Mulholland and Rosemond, 1992].…”

Section: Annual Patterns Of Daily Par In Wb Andmentioning

confidence: 94%

Seasonal patterns in streamwater nutrient and dissolved organic carbon concentrations: Separating catchment flow path and in‐stream effects

Mulholland¹,

Hill²

1997

Water Resources Research

Self Cite

254

228

View full text Add to dashboard Cite

2) and minima (<0.6) in spring and autumn, suggesting substantial in-stream net uptake at these times. Observed/predicted DOC concentration ratios were more variable and generally ->1 but did show consistent autumn maxima (>2.5), indicating substantial in-stream DOC generation at this time. Observed/ predicted ratios for all nutrients were generally less variable and were closer to 1.0 at high flow compared to low flow, suggesting that in-stream controls on streamwater chemistry are less important at high discharge than at low discharge. Our results indicate two general modes of control of stream nutrient concentrations: (1) catchment control via seasonal variation in the dominant hydrologic pathway (greater proportion of deep groundwater in summer), which produces lower winter and higher summer concentrations, and (2) in-stream control via high rates of net nutrient uptake during the spring (primarily by autotrophs) and autumn (primarily by heterotrophs).

show abstract

Section: Annual Patterns Of Daily Par In Wb Andmentioning

confidence: 94%

Seasonal patterns in streamwater nutrient and dissolved organic carbon concentrations: Separating catchment flow path and in‐stream effects

Mulholland¹,

Hill²

1997

Water Resources Research

Self Cite

254

228

View full text Add to dashboard Cite

show abstract

“…Volumetric excretion estimates the contribution of the excreted nutrient to nutrient concentrations in flowing water, and was calculated as: (Mulholland and Rosemond 1992; W.R. Hill, unpublished data). Mean stream width was determined from a previously published regression between stream discharge at the weir and width (Roberts and others 2007); water velocity was determined from a relationship between the travel time of the conservative tracer (measured as specific conductivity) from nutrient releases and stream discharge at the weir (velocity = 13.707 * Q weir + 49.386; R 2 = 0.97); and mean stream depth was calculated from a previously published relationship between discharge at the weir and depth (Roberts and others 2007).…”

Section: Volumetric Excretion and Excretion Turnover Distancementioning

confidence: 99%

Temporal Variation in the Importance of a Dominant Consumer to Stream Nutrient Cycling

Griffiths

Hill

2014

Ecosystems

View full text Add to dashboard Cite

Animal excretion can be a significant nutrient flux within ecosystems, where it supports primary production and facilitates microbial decomposition of organic matter. The effects of excretory products on nutrient cycling have been documented for various species and ecosystems, but temporal variation in these processes is poorly understood. We examined variation in excretion rates of a dominant grazing snail, Elimia clavaeformis, and its contribution to nutrient cycling, over the course of 14 months in a well-studied, low-nutrient stream (Walker Branch, east Tennessee, USA). Biomass-specific excretion rates of ammonium varied over twofold during the study, coinciding with seasonal changes in food availability (measured as gross primary production) and water temperature (multiple linear regression, R 2 = 0.57, P = 0.053). The contribution of ammonium excretion to nutrient cycling varied with seasonal changes in both biological (that is, nutrient uptake rate) and physical (that is, stream flow) variables. On average, ammonium excretion accounted for 58% of stream water ammonium concentrations, 26% of whole-stream nitrogen demand, and 66% of autotrophic nitrogen uptake. Phosphorus excretion by Elimia was contrastingly low throughout the year, supplying only 1% of total dissolved phosphorus concentrations. The high average N:P ratio (89:1) of snail excretion likely exacerbated phosphorus limitation in Walker Branch. To fully characterize animal excretion rates and effects on ecosystem processes, multiple measurements through time are necessary, especially in ecosystems that experience strong seasonality.

show abstract

“…In most cases, however, NO 3 -N concentrations essentially return to background levels by summer due to uptake in soils and (possibly) uptake in stream water (Mulholland, 1992;Mulholland and Rosemond, 1992). Where sampling continued beyond the summer following fertilization into subsequent fall and winter periods (Malueg et al, 1972;Moore, 1971;Fredriksen et al, 1975;Meehan et al, 1975;Stay et al, 1979;Hetherington, 1985), a fall NO 3 -N peak, which is elevated relative to that in control streams, has been observed.…”

Section: Longer-term Nutrient Losses To Streamsmentioning

confidence: 99%

“…During late spring and early summer, nitrate concentrations in streams affected by, and downstream of, fertilization decline in conjunction with declines in stream discharge. Reasons for these reductions include uptake by plants and trees in forest soils, denitrification or sequestration in hyporheic environments, and uptake by periphyton in streams (Mulholland, 1992;Mulholland and Rosemond, 1992). Dissolved organic nitrogen (DON) remains proportionally high (Sollins and McCorrison, 1981;Triska et.…”

Section: Conceptual Model Of Ecological Processing Of Fertilizer Nitrmentioning

confidence: 99%

Ecological effects on streams from forest fertilization: Literature review and conceptual framework for future study in the western Cascades

Anderson¹

2002

View full text Add to dashboard Cite

Periphyton Response to Longitudinal Nutrient Depletion in a Woodland Stream: Evidence of Upstream-Downstream Linkage

Cited by 85 publications

References 48 publications

Seasonal patterns in streamwater nutrient and dissolved organic carbon concentrations: Separating catchment flow path and in‐stream effects

Seasonal patterns in streamwater nutrient and dissolved organic carbon concentrations: Separating catchment flow path and in‐stream effects

Temporal Variation in the Importance of a Dominant Consumer to Stream Nutrient Cycling

Ecological effects on streams from forest fertilization: Literature review and conceptual framework for future study in the western Cascades

Contact Info

Product

Resources

About