The Relation of Periphytic and Planktonic Algal Growth in an Estuary to Hydrographic Factors

Welch, Eugene B.; Emery, Richard M.; Matsuda, Robert I.; Dawson, William A.

doi:10.4319/lo.1972.17.5.0731

Cited by 17 publications

(4 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…This is especially true for plankton, which are always subject to the movement of water through an estuary. For example, residence time can control the location and magnitude of estuarine phytoplankton blooms (9,45) and can influence the distribution of bacteria (25). Monsen et al (20) described three such transport time scales commonly used by ecologists to relate hydrodynamics to biological and chemical processes: residence time, age, and flushing time.…”

Section: Discussionmentioning

confidence: 99%

Microbial Biogeography along an Estuarine Salinity Gradient: Combined Influences of Bacterial Growth and Residence Time

Crump

Hopkinson

Sogin

et al. 2004

Appl Environ Microbiol

411

342

View full text Add to dashboard Cite

Shifts in bacterioplankton community composition along the salinity gradient of the Parker River estuary and Plum Island Sound, in northeastern Massachusetts, were related to residence time and bacterial community doubling time in spring, summer, and fall seasons. Bacterial community composition was characterized with denaturing gradient gel electrophoresis (DGGE) of PCR-amplified 16S ribosomal DNA. Average community doubling time was calculated from bacterial production ([ 14 C]leucine incorporation) and bacterial abundance (direct counts). Freshwater and marine populations advected into the estuary represented a large fraction of the bacterioplankton community in all seasons. However, a unique estuarine community formed at intermediate salinities in summer and fall, when average doubling time was much shorter than water residence time, but not in spring, when doubling time was similar to residence time. Sequencing of DNA in DGGE bands demonstrated that most bands represented single phylotypes and that matching bands from different samples represented identical phylotypes. Most river and coastal ocean bacterioplankton were members of common freshwater and marine phylogenetic clusters within the phyla Proteobacteria, Bacteroidetes, and Actinobacteria. Estuarine bacterioplankton also belonged to these phyla but were related to clones and isolates from several different environments, including marine water columns, freshwater sediments, and soil.Estuarine waters contain strong biological and chemical gradients established by the mixing of freshwater and seawater and modified by autochthonous biological activity. Many of these gradients, including salinity, nutrient concentration, organic matter composition, and bacteriovore community composition, are thought to influence the composition of natural bacterioplankton communities (2, 11). Such changes in environmental conditions, when recreated in mesocosm and microcosm experiments, caused shifts in the phylogenetic composition of bacterioplankton communities (10,19,32,41). It is therefore reasonable to predict that similar shifts will occur in natural freshwater and marine bacterioplankton communities when they encounter estuarine gradients, leading to the development of an estuarine community.Several studies have described estuarine microbial diversity and some have demonstrated how freshwater and marine bacterioplankton communities mix along estuarine gradients (3,4,8,14,21,37), but few reports have provided evidence of a unique estuarine bacterioplankton community. This is partly due to the dynamic nature of estuaries and the difficulty in distinguishing estuarine populations from those that wash in from adjacent environments. Crump et al. (6) identified putative estuarine bacteria associated with particles in the Columbia River estuarine turbidity maximum (ETM) by comparing environmental clone libraries of PCR-amplified 16S ribosomal DNA (rDNA) from the river, the estuary, and the coastal ocean. Similarly, Hollibaugh et al. (14) demonstrated the mixing of bacter...

show abstract

Section: Discussionmentioning

confidence: 99%

Microbial Biogeography along an Estuarine Salinity Gradient: Combined Influences of Bacterial Growth and Residence Time

Crump

Hopkinson

Sogin

et al. 2004

Appl Environ Microbiol

411

342

View full text Add to dashboard Cite

show abstract

“…Accordingly, detritus derived from these plants is likely to be advected out of the system (Nixon 1980;Lugo et al 1988;Hemminga et al 199 1). Similarly, coastal phytoplankton is often exported out of the estuaries and coastal areas where it grows (Welsh et al 1972;Malone and Chervin 1979).…”

Section: Methodsmentioning

confidence: 99%

The fate of marine autotrophic production

Duarte

Cebrián

1996

Limnology & Oceanography

817

551

View full text Add to dashboard Cite

The fate of photosynthetic carbon in marine ecosystems dominated by different types of primary producers was examined by compiling published reports on herbivory, autotrophic respiration, decomposition, carbon storage, and export rates as fractions of net primary production (NPP) in ecosystems dominated by different types of autotrophs (i.e. oceanic and coastal phytoplankton, microphytobe.lthos, coral reef algae, macroalgae, seagrasses, marsh plants, and mangroves). A large fraction (>40%) of ,.he NPP of marine ecosystems is decomposed within the system, except for microphytobenthos (decomposition, -25% of NPP). Herbivory tends to be highest for microalgae (planktonic and benthic, >40% of NPP) and macroalgae (33.6+4.9% of NPP) and is somewhat less for higher plants. Microphytobenthos export on average a much higher proportion of their NPP than do other microalgal communities, whereas marine macrophytes, except marsh plants, export a substantial proportion (24.3-43.5% on average) of their NPP. The ?-action of NPP stored in sediments is 4-fold greater for higher plants (-1 O-l 7% of NPP) than for algae (0.4-6% of NPP). On average -90% of the phytoplankton NPP is used to support local heterotrophic metabolism (i.e. grazed or decomposed). This fraction is even higher in oceanic communities. Mangrove forests, and to a lesser extent seagrass meadows and macroalgal beds, produce organic carbon well in excess of the ecosystem requirements, with excess photosynthetic carbon (i.e. export rate plus storage) in these ecosystem; representing -40% of NPP. Extrapolation of these results to the global ocean identifies marine angiosperms, which only contribute 4% of total ocean NPP, as major contributors ofthe NPP stored (30% of total ocean carbon storage) and subsequently buried in marine sediments. Consideration of burial of NPP from marine angiosperms should lead to estimates of total burial of marine NPP that exceed current estimates by 15-50%.

show abstract

“…L'augmentation de la production primaire maximale peut donc ttre associke a une augmentation de la biomasse algale par unite de volume puisque cette biomasse exprimee en poids frais a augmente dans les deux rivieres. Cet accroissement serait attribuable a une augmentation du temps de sejour des algues et a la diminution de la turbulence de l'eau constcutive a la diminution du debit, comme Welch et al (1972) l'ont observe dans des situations analogues. La chlorophylle-a a egalement augment t apres le detournement dans les deux rivikres.…”

Section: Tableau 4 Evolution Des Quelques Variables Physico-chimiqueunclassified

Facteurs contrôlant la production primaire dens deux rivières soumises a une forte réduction de débit

Lapierre

Planas

1987

Hydrobiologia

View full text Add to dashboard Cite

The effects of river diversion on phytoplankton primary production and biomass in the downstream part of two rivers were studied in relation to physical and chemical variables. These rivers, situated north of the 52nd parallel, are characteristic of oligotrophic systems with phytoplankton primary production less than 10.76 mg C m-2 h-l, chlorophyll -a lower than 3.0 mg m-3 and biomass between 118-1 007 mg m-3. The decrease in flow favored the establishment of an algal biomass approximately two times greater then that present before diversion. This increase in biomass was associated in one river with an increase of 2.5 times of the mean primary production. In the other river the primary production per unit of surface area remained stable but increased when expressed by unit volume, due to a great decrease in underwater light penetration, consequence of inorganic particular matter increase.

show abstract

The Relation of Periphytic and Planktonic Algal Growth in an Estuary to Hydrographic Factors

Cited by 17 publications

References 4 publications

Microbial Biogeography along an Estuarine Salinity Gradient: Combined Influences of Bacterial Growth and Residence Time

Microbial Biogeography along an Estuarine Salinity Gradient: Combined Influences of Bacterial Growth and Residence Time

The fate of marine autotrophic production

Facteurs contrôlant la production primaire dens deux rivières soumises a une forte réduction de débit

Contact Info

Product

Resources

About