The fate of marine autotrophic production

Duarte, Carlos M.; Cebrián, Just

doi:10.4319/lo.1996.41.8.1758

Cited by 790 publications

(586 citation statements)

References 43 publications

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“…This variability was correlated with climate (river flow and temperature) and long-term tidal exposure cycles. Recent evidence has confirmed that seagrass meadows are one of the most productive shallow water ecosystems (Margalef 1986, Stevenson 1988, Duarte & Cebrian 1996, Duarte & Chiscano 1999, Rasheed et al 2008. These findings present concern given the expected future climate scenarios of increased temperatures and more variable rainfall.…”

Section: Discussionmentioning

confidence: 84%

“…While these meadows constitute only a small fraction of the global marine primary production (1.13%), they play an important role as a carbon sink (Duarte & Cebrian 1996, Kennedy & Björk 2009). Seagrass meadows also provide important ecosystem services, such as nutrient cycling (Costanza et al 1997), providing refuge for highly productive fauna (Unsworth et al 2008 and supporting subsistence and commercial fisheries (Watson et al 1993, Unsworth & Cullen 2010.…”

Section: Introductionmentioning

confidence: 99%

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Long-term climate-associated dynamics of a tropical seagrass meadow: implications for the future

Rasheed¹,

Unsworth²

2011

Mar. Ecol. Prog. Ser.

103

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The long-term changes of tropical intertidal seagrass, mainly Halodule uninervis and Halophila ovalis meadows and their relationship to climate are poorly documented. Developing a greater understanding of the effects of climate on seagrass meadows is critical for estimating the effects of future climate change scenarios. Here we document the temporal dynamics of coastal intertidal seagrass in tropical northeast Australia over 16 yr of detailed monitoring. This study is the first to directly relate such change to long-term climate variability in the Indo-Pacific region and southern hemisphere. Regression modelling was used to relate seagrass biomass and meadow area measurements to climate data. The aboveground biomass and area of the meadow were correlated with the interacting factors of air temperature, precipitation, daytime tidal exposure and freshwater runoff from nearby rivers. Elevated temperature and reduced flow from rivers were significantly correlated (R 2 = 0.6, p < 0.001) with periods of lower seagrass biomass. Results of this study have important implications for the long-term viability of seagrasses with regard to climate change scenarios. Modelling of our findings indicates that future higher temperatures could be detrimental to Indo-Pacific intertidal, coastal and estuarine seagrass meadows.KEY WORDS: Climate change · Global warming · Halophila ovalis · Halodule uninervis · Temperature · Rainfall · Indo-Pacific · Queensland · Australia Resale or republication not permitted without written consent of the publisherMar Ecol Prog Ser 422: [93][94][95][96][97][98][99][100][101][102][103] 2011 been lost at an unprecedented rate from a variety of anthropogenic influences (Waycott et al. 2009). Predictions of the influence of climate change scenarios on seagrass (Short & Neckles 1999, Harley et al. 2006, Poloczanska et al. 2007, Waycott et al. 2007) are largely based on incidences of seagrass loss associated with extreme weather (Cardoso et al. 2008, Micheli et al. 2008 as reported in short-term experimental studies (Campbell et al. 2006). Long-term studies directly measuring seagrass changes and how they are correlated with climate are rare. Such studies are restricted to the Mediterranean Sea and coastal areas of Florida (Marba & Duarte 1997, Tomasko et al. 2005; no similar studies have been reported for the tropical Indo-Pacific region.Throughout the Indo-Pacific region, turbid estuarine and coastal environments commonly contain abundant and productive intertidal seagrass meadows dominated by the small colonising floral species of Halodule uninervis (Forssk.) Aschers., 1882 and Halophila ovalis (R.Br.) J. D. Hooker, 1858, Coles et al. 2003. Such meadows are often spatially expansive , Coles et al. 2003 and are particularly important food sources for dugong Dugong dugong and green turtles Chelonia mydas (Bjorndal 1985, Preen & Marsh 1995. The intertidal and coastal location of these meadows makes them susceptible to large climatic events, such as flooding , Campbell & McKenzie 2004, drought...

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Section: Discussionmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 99%

Long-term climate-associated dynamics of a tropical seagrass meadow: implications for the future

Rasheed¹,

Unsworth²

2011

Mar. Ecol. Prog. Ser.

103

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“…The inputs of total organic carbon (TOC) from the coastal ocean to the dark open ocean have been estimated at 0.17 Pmol C a −1 (e.g. Liu et al 2000), representing a significant fraction of the global TOC export from the coastal to the open ocean, which have been estimated to range from 0.23 Pmol C a −1 (Gattuso et al 1998) to 0.5 Pmol C a −1 (Duarte and Cebrián 1996;Duarte et al 1999).…”

Section: Coastal Inputs To the Dark Oceanmentioning

confidence: 99%

Respiration in the mesopelagic and bathypelagic zones of the oceans

Arı́stegui¹,

Agustı́²,

Middelburg³

et al. 2005

Respiration in Aquatic Ecosystems

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OutlineIn this chapter the mechanisms of transport and remineralization of organic matter in the dark water-column and sediments of the oceans are reviewed. We compare the different approaches to estimate respiration rates, and discuss the discrepancies obtained by the different methodologies. Finally, a respiratory carbon budget is produced for the dark ocean, which includes vertical and lateral fluxes of organic matter. In spite of the uncertainties inherent in the different approaches to estimate carbon fluxes and oxygen consumption in the dark ocean, estimates vary only by a factor of 1.5. Overall, direct measurements of respiration, as well as indirect approaches, converge to suggest a total dark ocean respiration of 1.5-1.7 Pmol C a −1 . Carbon mass balances in the dark ocean suggest that the dark ocean receives 1.5-1.6 Pmol C a −1 , similar to the estimated respiration, of which >70% is in the form of sinking particles. Almost all the organic matter (∼92%) is remineralized in the water column, the burial in sediments accounts for <1%. Mesopelagic (150-1000 m) respiration accounts for ∼70% of dark ocean respiration, with average integrated rates of 3-4 mol C m −2 a −1 , 6-8 times greater than in the bathypelagic zone (∼0.5 mol C m −2 a −1 ). The results presented here renders respiration in the dark ocean a major component of the carbon flux in the biosphere, and should promote research in the dark ocean, with the aim of better constraining the role of the biological pump in the removal and storage of atmospheric carbon dioxide.

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“…Yearly at the end of summer, the seagrass losses a major part of its leaf biomass after senescence. The fate of these P. oceanica dead leaves, also called leaf litter, varies (Pergent et al, 1997): a part of the leaf litter decays slowly or is buried within the meadow, while another part is exported to other adjacent habitats where it may represent a considerable organic material input (Cebrian et al, 1997;Duarte and Cebrian, 1996;Romero et al, 1994). Such exported leaf litter mixes with drift epilithic macroalgae, uprooted living seagrass shoots with rhizomes, other seagrass litter, seeds, dead macrofauna and fine sediment to form detritus.…”

Section: Introductionmentioning

confidence: 99%

Seasonal variability of meiofauna, especially harpacticoid copepods, in Posidonia oceanica macrophytodetritus accumulations

Mascart

Lepoint

Deschoemaeker

et al. 2015

Journal of Sea Research

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The overall aim of this study was (1) to assess the diversity and density of meiofauna taxa, especially harpacticoid copepod species, present within accumulated seagrass macrophytodetritus on unvegetated sand patches and (2) to elucidate the community structure of detritus-associated harpacticoid copepods in relation to natural temporal variability of physico-chemical characteristics of accumulations. This was investigated in a Posidonia oceanica (L.) Delile seagrass ecosystem in the northwest Mediterranean Sea (Bay of Calvi, Corsica, 42°35′N, 8°43′E) using a triplicate macrophytodetritus core field sampling in two contrasting sites over the four seasons of 2011. Meiofauna higher taxa consisted of 50% Copepoda, of which 87% belonged to the Harpacticoida order. Nematoda was the second most abundant taxa. The copepod community displayed a wide variety of morphologically similar and ecologically different species (i.e. mesopsammic, phytal, phytal-swimmers, planktonic and parasitic). The harpacticoid copepod community followed a strong seasonal pattern with highest abundances and species diversity in May-August, revealing a link with the leaf litter epiphyte primary production cycle. Aside from the important role in sheltering, housing and feeding potential of macrophytodetritus, a harpacticoid community BEST analysis demonstrated a positive correlation with habitat complexity and a negative correlation with water movements and P. oceanica leaf litter accumulation.

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The fate of marine autotrophic production

Cited by 790 publications

References 43 publications

Long-term climate-associated dynamics of a tropical seagrass meadow: implications for the future

Long-term climate-associated dynamics of a tropical seagrass meadow: implications for the future

Respiration in the mesopelagic and bathypelagic zones of the oceans

Seasonal variability of meiofauna, especially harpacticoid copepods, in Posidonia oceanica macrophytodetritus accumulations

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