Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements

Morison, J. I. L.; Piedade, Maria Teresa Fernandez; Müller, E.; Long, Stephen P.; Junk, Wolfgang J.; Jones, Mike

doi:10.1007/s004420000464

Cited by 121 publications

(68 citation statements)

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“…3c,f). Both NEE raw and ER raw were depressed in the wet season relative to the dry season, and this pattern is opposite that found in other wetlands characterized by dry and wet seasons (Morison et al, 2000;Jones and Humphries, 2002 (Fig. 3d,e).…”

Section: Environmental Drivers Of Co 2 Exchangecontrasting

confidence: 81%

“…Morison et al, 2000;Jones and Humphries, 2002). However, short-term data from these studies show NEE that is more than four times greater than the maximum values observed in this Everglades marsh (Fig.…”

Section: Annual Ecosystem Co 2 Exchangementioning

confidence: 66%

“…3a,b). For example, maximum NEE of 30-35 µmol m -2 s -1 was recorded in Amazonian floodplains (Morison et al, 2000), while maximum NEE of 24 µmol m -2 s -1 was found in African papyrus (Cyperus papyrus) wetlands (Jones and Humphries, 2002). Further, the highest rates of CO 2 uptake in these tropical wetlands were found during periods with the highest water levels.…”

Section: Annual Ecosystem Co 2 Exchangementioning

confidence: 94%

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Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Schedlbauer

Oberbauer

Starr

et al. 2010

Agricultural and Forest Meteorology

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Although wetlands are among the world's most productive ecosystems, little is known of long-term CO 2 exchange in tropical and subtropical wetlands. The Everglades is a highly managed wetlands complex occupying >6000 km 2 in south Florida. This ecosystem is oligotrophic, but extremely high rates of productivity have been previously reported. To evaluate CO 2 exchange and its response to seasonality (dry vs. wet season) in the Everglades, an eddy covariance tower was established in a short-hydroperiod marl marsh. Rates of net ecosystem exchange and ecosystem respiration were small year-round and declined in the wet season relative to the dry season. Inundation reduced macrophyte CO 2 uptake, substantially limiting gross ecosystem production. While light and air temperature exerted the primary controls on net ecosystem exchange and ecosystem respiration in the dry season, inundation weakened these relationships. The ecosystem shifted from a CO 2 sink in the dry season to a CO 2 source in the wet season; however, the marsh was a small carbon sink on an annual basis. Net ecosystem production, ecosystem respiration, and gross ecosystem production were -49.9, 446.1 and 496.0 g C m -2 year -1 , respectively. Unexpectedly low CO 2 flux rates and annual production distinguish the Everglades from many other wetlands. Nonetheless, impending changes in water management are likely to alter the CO 2 balance of this wetland and may increase the source strength of these extensive short-hydroperiod wetlands.3

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Section: Environmental Drivers Of Co 2 Exchangecontrasting

confidence: 81%

Section: Annual Ecosystem Co 2 Exchangementioning

confidence: 66%

Section: Annual Ecosystem Co 2 Exchangementioning

confidence: 94%

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Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Schedlbauer

Oberbauer

Starr

et al. 2010

Agricultural and Forest Meteorology

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“…These negative correlations between NEE and PAR (or positive correlations between NEP and the intensity of available light) reveal an optimal adaptation of the plants to the environmental conditions created by the solar radiation, such as temperature, humidity and light. Similar negative correlations have been observed with EC by Morison et al (2000) for the C 4 aquatic grass Echinochloa polystachya of the Amazon and by Kathilankal et al (2008) for the Spartina alterniflora in a salt marsh on the eastern coast of Virginia. Using static chambers, Silva et al (2005) obtained the same results for Zostera noltii meadows in the intertidal flats of the Ria Formosa flat in Portugal.…”

Section: Relationship Between Low Tide Co 2 Fluxes and The Distributisupporting

confidence: 77%

Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production

et al. 2012

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Abstract. Measurements of carbon dioxide fluxes were performed over a temperate intertidal mudflat in southwestern France using the micrometeorological Eddy Covariance (EC) technique. EC measurements were carried out in two contrasting sites of the Arcachon flat during four periods and in three different seasons (autumn 2007, summer 2008, autumn 2008 and spring 2009). In addition, satellite images of the tidal flat at low tide were used to link the net ecosystem CO 2 exchange (NEE) with the occupation of the mudflat by primary producers, particularly by Zostera noltii meadows. CO 2 fluxes during the four deployments showed important spatial and temporal variations, with the flat rapidly shifting from sink to source with the tide. Absolute CO 2 fluxes showed generally small negative (influx) and positive (efflux) values, with larger values up to −13 µmol m −2 s −1 for influxes and 19 µmol m −2 s −1 for effluxes. Low tide during the day was mostly associated with a net uptake of atmospheric CO 2 . In contrast, during immersion and during low tide at night, CO 2 fluxes where positive, negative or close to zero, depending on the season and the site. During the autumn of 2007, at the innermost station with a patchy Zostera noltii bed (cover of 22 ± 14 % in the wind direction of measurements), CO 2 influx was −1.7 ± 1.7 µmol m −2 s −1 at low tide during the day, and the efflux was 2.7 ± 3.7 µmol m −2 s −1 at low tide during the night. A gross primary production (GPP) of 4.4 ± 4.1 µmol m −2 s −1 during emersion could be attributed to microphytobenthic communities. During the summer and autumn of 2008, at the central station with a dense eelgrass bed (92 ± 10 %), CO 2 uptakes at low tide during the day were −1.5 ± 1.2 and −0.9 ± 1.7 µmol m −2 s −1 , respectively. Night time effluxes of CO 2 were 1.0 ± 0.9 and 0.2 ± 1.1 µmol m −2 s −1 in summer and autumn, respectively, resulting in a GPP during emersion of 2.5 ± 1.5 and 1.1 ± 2.0 µmol m −2 s −1 , respectively, attributed primarily to the seagrass community. At the same station in April 2009, before Zostera noltii started to grow, the CO 2 uptake at low tide during the day was the highest (-2.7 ± 2.0 µmol m −2 s −1 ). Influxes of CO 2 were also observed during immersion at the central station in spring and early autumn and were apparently related to phytoplankton blooms occurring at the mouth of the flat, followed by the advection of CO 2 -depleted water with the flooding tide.Published by Copernicus Publications on behalf of the European Geosciences Union. P. Polsenaere et al.: Spatial and temporal CO 2 exchanges measured by Eddy CovarianceAlthough winter data as well as water carbon measurements would be necessary to determine a precise CO 2 budget for the flat, our results suggest that tidal flat ecosystems are a modest contributor to the CO 2 budget of the coastal ocean.

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“…The large proportion of autochthonous items consumed by P. flavipinnis reflects the high amount of fish and aquatic insects on its diet, which is probably related to the high productivity of the Central Amazonian floodplains (MORISON et al, 2000). Pellona flavipinnis may be classified as a generalist carnivorous species that feeds mainly on fishes and aquatic insects, according to prey availability.…”

Section: Discussionmentioning

confidence: 99%

Feeding of Pellona flavipinnis (Clupeiformes, Pristigasteridae)in a Central Amazonian floodplain

Moreira-Hara

Zuanon

Amadio

2009

Iheringia, Sér. Zool.

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ABSTRACT. The feeding habits of Pellona flavipinnis (Valenciennes, 1836) at Catalão, a floodplain area on the Brazilian Central Amazon was studied. Data was obtained during three hydrological cycles, between September 1999 and September 2003. Diet composition, daily and seasonal variation in the feeding activity and the relationship between predator's size and its prey were analyzed. Almost 80% of the food consumed has autochthonous origin and diet was composed basically by insects and fish. Juvenile fish predominated in the stomach contents of all size classes but there was no significant relationship between predator's size and its prey. Pellona flavipinnis may be considered a carnivorous species which feeds mainly on juvenile (young-of-the-year) specimens of other fish. More intense feeding activity occurred at night and in the high water period. KEYWORDS.Amazon basin, hydrological cycle, diet, carnivory, feeding activity.RESUMO. Dieta de Pellona flavipinnis (Clupeiformes, Pristigasteridae) em planície alagada da Amazônia Central. Os hábitos alimentares de Pellona flavipinnis (Valenciennes, 1836) de uma área de várzea na Amazônia Central, Catalão, foram estudados. Foram utilizados dados referentes a três ciclos hidrológicos, entre setembro de 1999 e setembro de 2003. Foram analisados a dieta, a atividade alimentar diária e sazonal e a relação entre o comprimento da presa e o do predador. Cerca de 80% dos alimentos consumidos eram de origem autóctone e a dieta composta basicamente de insetos e peixes. Peixes juvenis predominaram nos conteúdos estomacais de exemplares de todas as classes de tamanho, mas não houve relação significativa entre o tamanho do predador e o das presas consumidas. Pellona flavipinnis pode ser considerada uma espécie carnívora que se alimenta principalmente de indivíduos juvenis de outras espécies de peixes. A atividade alimentar foi maior durante a noite e no período da cheia.

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Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements

Cited by 121 publications

References 30 publications

Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production

Feeding of Pellona flavipinnis (Clupeiformes, Pristigasteridae)in a Central Amazonian floodplain

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Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements

Cited by 121 publications

References 30 publications

Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Seasonal differences in the CO2 exchange of a short-hydroperiod Florida Everglades marsh

Spatial and temporal CO&lt;sub&gt;2&lt;/sub&gt; exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production

Feeding of Pellona flavipinnis (Clupeiformes, Pristigasteridae)in a Central Amazonian floodplain

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Product

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Spatial and temporal CO<sub>2</sub> exchanges measured by Eddy Covariance over a temperate intertidal flat and their relationships to net ecosystem production