Seasonal shifts in seagrass bed primary producers in a cold-temperate estuary: Dynamics of eelgrass Zostera marina and associated epiphytic algae

Hasegawa, Natsuki; Hori, Masakazu; Mukai, Hiroshi

doi:10.1016/j.aquabot.2006.12.002

Cited by 47 publications

(42 citation statements)

References 32 publications

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“…Likewise, high abundances of G. fucicola have been related to detritus accumulation in seagrass meadows right after the decay of the leaves (Lepoint et al 2006). Furthermore, the increase in seagrass biomass favors the establishment of epiphytic algae, which bloom in August and provide additional food for secondary producers (Hasegawa et al 2007). This leads to high rates of the secondary production, with grazers such as amphipods of the families Dexaminidae and Amphitoidae as well as most of the isopods reaching their greatest abundances after late summer (Fredette et al 1990).…”

Section: Discussionmentioning

confidence: 97%

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Peracarid assemblages of Zostera meadows in an estuarine ecosystem (O Grove inlet, NW Iberian Peninsula): spatial distribution and seasonal variation

2010

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The Galician rias are singular and complex estuarine systems of great economic importance. Seagrasses are key elements of the ecosystem and favor the maintenance of high species diversity in benthic communities. Nevertheless, the ecological role of seagrass meadows in the Galician rias has been only partially assessed. Peracarid crustaceans are an important component of soft-bottom faunas and have great importance for the structure of benthic assemblages. In this work, species diversity, patterns of distribution and seasonal fluctuations of peracarids (Crustacea, Peracarida) are studied in estuarine sediments colonized by two species of Zostera (Z. marina and Z. noltii) at the O Grove inlet (Ría de Arousa, Galicia, NW Iberian Peninsula). The spatial distribution of peracarid assemblages was characterized by high numerical dominances due to a few species, particularly tanaidaceans. The temporal study at a Z. marina meadow showed a strongly seasonal pattern defined by great fluctuations of the amphipod population, the latter being the dominant group in abundance and number of species. The highest numbers of species and individuals were observed in September, with minimum values in March. Analyses pointed out a high correlation among the granulometric features of the studied bottoms and the faunistic attributes. Nevertheless, the presence of the seagrasses should influence in a major way the hydrodynamic and sedimentary features of the habitat and utterly the spatial and temporal patterns observed in the peracarid assemblage in the O Grove inlet.

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Section: Discussionmentioning

confidence: 97%

“…In particular, Zostera marina shows a clear seasonal dynamics, with elongation of the leaves and rhizomes in spring-summer and spreading of seeds in winter (Hasegawa et al 2007). This may be reflected in changes of the peracarid faunas, as indicated by the present study.…”

Section: Discussionmentioning

confidence: 98%

Peracarid assemblages of Zostera meadows in an estuarine ecosystem (O Grove inlet, NW Iberian Peninsula): spatial distribution and seasonal variation

2010

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“…The assumption that productivity of kelp and seagrass in the Isles of Scilly is comparable to that of Norwegian kelp and Danish seagrass probably reduced the accuracy of estimates. Productivity of these plants is influenced by physical conditions such as temperature, water clarity, nutrient availability and competition with other flora and grazing fauna (Hasegaw et al, 2007), which may vary between the Isles of Scilly and the study sites where the productivity rates were determined. Exudate rates of seaweeds have been found to vary in the natural environment by up to 35% of the net assimilation value (Hatcher et al, 1977), which may have resulted in inaccuracies when the Norwegian kelp productivity data were transferred to the Isles of Scilly.…”

Section: Valuing Gas and Climate Regulationmentioning

confidence: 99%

Valuing the regulatory services provided by marine ecosystems

et al. 2010

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a It is widely accepted that mankind derives benefits from ecosystem services provided by the marine environment. It is less clear how these benefits can be quantified in order to make objective and responsible environmental management decisions. Providing an economic quantification of these benefits is one approach that can help. While it is relatively simple to derive monetary values for benefits accruing from activities with an economic basis, such as food provision and tourism, different approaches must be taken to provide economic values for services with less obvious links to economic activity. Here we demonstrate how a range of approaches may be used to derive economic values for three very different ecosystem services provided by marine environments, namely the bioremediation of waste by marine biota, the fixation of carbon dioxide by photosynthetic marine organisms, and the sea defence role provided by wetlands in coastal areas of the UK.

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“…There are many methods that have been used to determine benthic metabolism, including extrapolation from photosynthesis-irradiance curves (Kraemer and Alberte 1993), changes in primary producer biomass (Hasegawa et al 2007), mass balance models (Kemp et al 1997;Kaldy et al 2002), diel changes in water-column concentrations of either dissolved oxygen (DO) or dissolved inorganic carbon (''open-water'' method;D'Avanzo et al 1996;Ziegler and Benner 1998), and direct benthic flux measurements of DO or dissolved inorganic carbon in either in situ chambers or laboratory incubations of substrate cores (McGlathery et al 2001;Gazeau et al 2005;Yarbro and Carlson 2008). These conventional methods all have significant limitations.…”

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confidence: 99%

Dissolved oxygen fluxes and ecosystem metabolism in an eelgrass (Zostera marina) meadow measured with the eddy correlation technique

Hume

Berg

McGlathery

2010

Limnology & Oceanography

154

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Dissolved oxygen (DO) fluxes were measured by eddy correlation to estimate net ecosystem metabolism (NEM) during summer in a restored eelgrass (Zostera marina) meadow and a nearby, unvegetated sediment. This technique measures benthic fluxes under true in situ light and hydrodynamic conditions, integrates over a large area (typically . 100 m 2 ), and captures short-term variations. DO fluxes measured through eight 24-h periods showed pronounced temporal variation driven by light and local hydrodynamics on multiple scales: hour-to-hour, within each daily cycle, and between deployments. The magnitude of variation between hours during single deployments equaled that between deployments, indicating that short-term variation must be included for metabolism estimates to be accurate. DO flux variability was significantly correlated to mean current velocity for the seagrass site and to significant wave height for the unvegetated site. Fluxes measured in low-flow conditions analogous to many chamber and core incubations underestimated those measured in higher-flow conditions typical of in situ conditions by a factor of 2-6. Rates of gross primary production (GPP), respiration (R), and NEM varied substantially between individual deployments, reflecting variations in light and hydrodynamic conditions, and daily values of GPP and R for individual deployments were tightly linked. Average daily NEM of the seagrass site was higher than that of the unvegetated site; the seagrass site was in metabolic balance, and the unvegetated site showed a tendency toward net heterotrophy during this midsummer period.

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Seasonal shifts in seagrass bed primary producers in a cold-temperate estuary: Dynamics of eelgrass Zostera marina and associated epiphytic algae

Cited by 47 publications

References 32 publications

Peracarid assemblages of Zostera meadows in an estuarine ecosystem (O Grove inlet, NW Iberian Peninsula): spatial distribution and seasonal variation

Peracarid assemblages of Zostera meadows in an estuarine ecosystem (O Grove inlet, NW Iberian Peninsula): spatial distribution and seasonal variation

Valuing the regulatory services provided by marine ecosystems

Dissolved oxygen fluxes and ecosystem metabolism in an eelgrass (Zostera marina) meadow measured with the eddy correlation technique

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