The Ecological Role of Aquatic Bryophytes in a Woodland Stream

Steinman, Alan D.; Boston, Harry L.

doi:10.2307/1467681

Cited by 54 publications

(42 citation statements)

References 21 publications

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“…This supports observations by McAuliffe (1983), Steinman &Boston (1993), andEnglund (1991) who also highlighted the importance of substrate stability to these plants. Table 7 Invertebrate taxa whose densities differed significantly (ANCOVA; P < 0.05) between bryophytes with either detritus or periphyton among their stems in streams at both Temple Basin and draining into the Mingha River.…”

Section: Discussionsupporting

confidence: 91%

Bryophytes and associated invertebrates in first‐order alpine streams of Arthur's Pass, New Zealand

Suren

1993

New Zealand Journal of Marine and Freshwater Research

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Tributary alpine streams in six subcatchments in Arthur's Pass National Park (South Island, New Zealand) were surveyed to assess the frequency of streams supporting aquatic bryophytes. Relationships between streambed stability and bryophyte occurrence were examined. Invertebrate communities associated with bryophytes were characterised, and compared between streams flowing above the tree line, and below. Of 103 tributary streams encountered, 53 were above the tree line, and 50 were below. Aquatic bryophytes occurred in half these streams irrespective of riparian shading, but bryophyte distributions were strongly influenced by streambed stability. Invertebrate communities associated with bryophytes were dominated by Nematoda, Chironomidae, Oligochaeta, and Copepoda. This is fundamentally different from the bryofauna outside New Zealand, and may reflect the absence of certain bryophyte-dwelling families of Trichoptera, Plecoptera, and Ephemeroptera from New Zealand. Invertebrate densities within bryophytes were higher above the tree line, and the faunal composition also differed between streams. This may reflect differences in detrital and periphyton biomass associated with bryophytes in each stream type. Positive relationships existed between bryophyte biomass, and both invertebrate density and detrital/ periphyton biomass. Invertebrate densities were also higher within plants containing periphyton than plants containing detritus, suggesting periphyton's greater value as a food source to invertebrates. M93016

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Section: Discussionsupporting

confidence: 91%

Bryophytes and associated invertebrates in first‐order alpine streams of Arthur's Pass, New Zealand

Suren

1993

New Zealand Journal of Marine and Freshwater Research

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“…However, it might also be due to nutrient storage elsewhere in the plant, followed by internal translocation when P concentrations start to fall. The terrestrial liverwort Porella pinnata has been shown to accumulate 'luxury' levels of P, which are probably mobilised when ambient levels were low (Steinman and Boston, 1993). The terrestrial moss Pseudoscleropodium purum also showed luxury P uptake, but the concentration was reduced rapidly during periods of low ambient P, possibly due to growth dilution and membrane leakiness (Bates, 1994).…”

Section: Discussionmentioning

confidence: 99%

Aquatic plant nutrients, moss phosphatase activities and tissue composition in four upland streams in northern England

Ellwood¹,

Haile²,

Whitton³

2008

Journal of Hydrology

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“…This reach of the West Fork of Walker Branch (hereafter referred to as Walker Branch) has been the site of numerous previous studies of phosphorus spiraling , 1983a, Mulholland et al 1985, periphyton-herbivore interactions (Rosemond 1993, nutrient dynamics (Mulholland 1992, Mulholland andHill 1997), metabolism (Marzolf et al 1994), and bryophytes (Steinman and Boston 1993). An earlier study indicated that algal growth and litter decomposition were phosphorus limited in Walker Branch , although a more recent investigation has shown that algae are co-limited by N and P in spring .…”

Section: Study Sitementioning

confidence: 99%

NITROGEN CYCLING IN A FOREST STREAM DETERMINED BY A¹⁵N TRACER ADDITION

Mulholland

Tank

Sanzone

et al. 2000

Ecological Monographs

138

100

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Abstract. Nitrogen uptake and cycling was examined using a six-week tracer addition of 15 N-labeled ammonium in early spring in Walker Branch, a first-order deciduous forest stream in eastern Tennessee. Prior to the 15 N addition, standing stocks of N were determined for the major biomass compartments. During and after the addition, 15 N was measured in water and in dominant biomass compartments upstream and at several locations downstream. Residence time of ammonium in stream water (5-6 min) and ammonium uptake lengths (23-27 m) were short and relatively constant during the addition. Uptake rates of NH 4 were more variable, ranging from 22 to 37 g N·m Ϫ2 ·minϪ1 and varying directly with changes in streamwater ammonium concentration (2.7-6.7 g/L). The highest rates of ammonium uptake per unit area were by the liverwort Porella pinnata, decomposing leaves, and fine benthic organic matter (FBOM), although epilithon had the highest N uptake per unit biomass N.Nitrification rates and nitrate uptake lengths and rates were determined by fitting a nitrification/nitrate uptake model to the longitudinal profiles of 15 N-NO 3 flux. Nitrification was an important sink for ammonium in stream water, accounting for 19% of the total ammonium uptake rate. Nitrate production via coupled regeneration/nitrification of organic N was about one-half as large as nitrification of streamwater ammonium. Nitrate uptake lengths were longer and more variable than those for ammonium, ranging from 101 m to infinity. Nitrate uptake rate varied from 0 to 29 g·m Ϫ2 ·min Ϫ1 and was ϳ1.6 times greater than assimilatory ammonium uptake rate early in the tracer addition. A sixfold decline in instream gross primary production rate resulting from a sharp decline in light level with leaf emergence had little effect on ammonium uptake rate but reduced nitrate uptake rate by nearly 70%.At the end of the addition, 64-79% of added 15 N was accounted for, either in biomass within the 125-m stream reach (33-48%) or as export of 15 N-NH 4 (4%), 15 N-NO 3 (23%), and fine particulate organic matter (4%) from the reach. Much of the 15 N not accounted for was probably lost downstream as transport of particulate organic N during a storm midway through the experiment or as dissolved organic N produced within the reach. Turnover rates of a large portion of the 15 N taken up by biomass compartments were high (0.04-0.08 per day), although a substantial portion of the 15 N in Porella (34%), FBOM (21%), and decomposing wood (17%) at the end of the addition was retained 75 d later, indicating relatively long-term retention of some N taken up from water.In total, our results showed that ammonium retention and nitrification rates were high in Walker Branch, and that the downstream loss of N was primarily as nitrate and was controlled largely by nitrification, assimilatory demand for N, and availability of ammonium to meet that demand. Our results are consistent with recent 15 N tracer experiments in Ndeficient forest soils that showed high rates of nitrification and the im...

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The Ecological Role of Aquatic Bryophytes in a Woodland Stream

Cited by 54 publications

References 21 publications

Bryophytes and associated invertebrates in first‐order alpine streams of Arthur's Pass, New Zealand

Bryophytes and associated invertebrates in first‐order alpine streams of Arthur's Pass, New Zealand

Aquatic plant nutrients, moss phosphatase activities and tissue composition in four upland streams in northern England

NITROGEN CYCLING IN A FOREST STREAM DETERMINED BY A¹⁵N TRACER ADDITION

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The Ecological Role of Aquatic Bryophytes in a Woodland Stream

Cited by 54 publications

References 21 publications

Bryophytes and associated invertebrates in first‐order alpine streams of Arthur's Pass, New Zealand

Bryophytes and associated invertebrates in first‐order alpine streams of Arthur's Pass, New Zealand

Aquatic plant nutrients, moss phosphatase activities and tissue composition in four upland streams in northern England

NITROGEN CYCLING IN A FOREST STREAM DETERMINED BY A15N TRACER ADDITION

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NITROGEN CYCLING IN A FOREST STREAM DETERMINED BY A¹⁵N TRACER ADDITION