Agricultural influences on the magnitude of stream metabolism in humid tropical headwater streams

Ortega‐Pieck, Aline; Fremier, Alexander K.; Orr, C. H.

doi:10.1007/s10750-017-3204-5

Cited by 8 publications

(9 citation statements)

References 57 publications

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“…Our synthesis across the tropics showed that open canopies above streams drove greater GPP (Fig. 4), as has been shown in Costa Rican streams (Ortega‐Pieck et al 2017) while ER was similar across open and closed canopy types. While the relationship between seasonal inputs of organic matter during the fall leaf abscission and ER in temperate streams has been established (Hill et al 2001), exploration of this relationship in tropical streams is needed.…”

Section: Discussionsupporting

confidence: 75%

“…3e). The highest SRP concentrations (250 μg L −1 ) came from an agriculturally influenced streams in Costa Rica (Ortega-Pieck et al 2017), where low ER (− 0.5 and − 0.8 g O 2 m −2 d −1 ) were measured relative to the overall mean ER (ER = −6.01 g O 2 m −2 d −1 ) in this review. The negative relationship of ER and SRP counters research from lowland forested streams in Costa Rica, where SRP is a driver of microbial respiration (Ramírez et al 2003), macroinvertebrate abundance (Rosemond et al 2002), and leaf litter decomposition rates (Ardón et al 2006) across similar hydrologic and light conditions.…”

Section: Discussionmentioning

confidence: 74%

“…The negative relationship of ER and SRP counters research from lowland forested streams in Costa Rica, where SRP is a driver of microbial respiration (Ramírez et al 2003), macroinvertebrate abundance (Rosemond et al 2002), and leaf litter decomposition rates (Ardón et al 2006) across similar hydrologic and light conditions. As each of these responses to SRP contribute to integrative ER, we would hypothesize ER to increase with SRP in these streams, but conflicts with results from agriculturally influenced streams (Ortega-Pieck et al 2017). Decreased ER in streams with higher SRP may be the result of loading of agriculturally derived chemicals (e.g., pollutants, pesticides) and obscuring a presumed stimulatory effect of SRP.…”

Section: Discussionmentioning

confidence: 89%

“…Models were selected by comparing AIC scores, via AIC weights. Asterisks (*) designate the best model for each GPP and ER.as has been shown in Costa Rican streams(Ortega-Pieck et al 2017) while ER was similar across open and closed canopy types. While the relationship between seasonal inputs of organic matter during the fall leaf abscission and ER in temperate streams has been established…”

mentioning

confidence: 89%

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Ecosystem metabolism in tropical streams and rivers: a review and synthesis

Marzolf

Ardón

2021

Limnology & Oceanography

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Ecosystem metabolism of freshwater ecosystems has been studied for several decades, with theory and synthesis largely derived from temperate streams and rivers in North America and Europe. Advances in sensor technology and modeling have opened a wider range of streams to be included to test theories beyond temperate streams. In this paper, we review and synthesize ecosystem metabolism data from tropical streams and rivers to determine to what extent the constraints of metabolism measured in temperate streams are similar in tropical streams. We compiled 202 measurements of gross primary productivity (GPP) and ecosystem respiration (ER) from 83 tropical streams spanning 22.2 S to 18.4 N. Overall, tropical streams were heterotrophic (ER > GPP), with GPP ranging from 0.01 to 11.7 g O 2 m −2 d −1 and ER ranging from −0.2 to −42.1 g O 2 m −2 d −1 , similar on average to rates reviewed from temperate streams, but with higher maximum ER in tropical streams. Gross primary productivity increased with watershed area; a result also observed in temperate streams. ER decreased with elevated phosphorus and higher annual rainfall. We constructed a structural equation model that explained greater variation of ER (74%) than GPP (26%), and reflects similar drivers, such as land-use and watershed area, as in temperate streams. We conclude that tropical stream ecosystem metabolism has similar drivers as temperate streams, and a warmer and wetter climate and human use of tropical lands will influence metabolic rates in streams.

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Section: Discussionsupporting

confidence: 75%

Section: Discussionmentioning

confidence: 74%

Section: Discussionmentioning

confidence: 89%

mentioning

confidence: 89%

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Ecosystem metabolism in tropical streams and rivers: a review and synthesis

Marzolf

Ardón

2021

Limnology & Oceanography

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“…We found very low GPP, high ER, and negative NEP in all streams, consistent with other studies reporting widespread net heterotrophy in forested tropical streams [9]. Low light availability as a result of dense riparian canopy cover in both land use types likely plays a large role in constraining photosynthesis (Figure 1; [9,77,[92][93][94]. Our GPP values were similar to other studies in the neighboring Cerrado region (<0.1-0.818 g m −2 d −1 ; [95,96]), the Peruvian Amazon (0.07-0.189 g m −2 d −1 ; [97]), and forested headwater tropical streams more broadly, which typically have very low or undetectable rates of GPP [9,92,93,98,99].…”

Section: Stream Metabolismsupporting

confidence: 90%

Land Use Change Influences Ecosystem Function in Headwater Streams of the Lowland Amazon Basin

Jankowski

Deegan

Neill

et al. 2021

Water

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Intensive agriculture alters headwater streams, but our understanding of its effects is limited in tropical regions where rates of agricultural expansion and intensification are currently greatest. Riparian forest protections are an important conservation tool, but whether they provide adequate protection of stream function in these areas of rapid tropical agricultural development has not been well studied. To address these gaps, we conducted a study in the lowland Brazilian Amazon, an area undergoing rapid cropland expansion, to assess the effects of land use change on organic matter dynamics (OM), ecosystem metabolism, and nutrient concentrations and uptake (nitrate and phosphate) in 11 first order streams draining forested (n = 4) or cropland (n = 7) watersheds with intact riparian forests. We found that streams had similar terrestrial litter inputs, but OM biomass was lower in cropland streams. Gross primary productivity was low and not different between land uses, but ecosystem respiration and net ecosystem production showed greater seasonality in cropland streams. Although we found no difference in stream concentrations of dissolved nutrients, phosphate uptake exceeded nitrate uptake in all streams and was higher in cropland than forested streams. This indicates that streams will be more retentive of phosphorus than nitrogen and that if fertilizer nitrogen reaches streams, it will be exported in stream networks. Overall, we found relatively subtle differences in stream function, indicating that riparian buffers have thus far provided protection against major functional shifts seen in other systems. However, the changes we did observe were linked to watershed scale shifts in hydrology, water temperature, and light availability resulting from watershed deforestation. This has implications for the conservation of tens of thousands of stream kilometers across the expanding Amazon cropland region.

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