Nitrogen fixation by epiphytic and epibenthic diazotrophs associated with seagrass meadows along the Tanzanian coast, Western Indian Ocean

Hamisi, Mariam; Lyimo, Thomas J.; Muruke, Masoud Hadi; Bergman, Birgitta

doi:10.3354/ame01323

Cited by 28 publications

(20 citation statements)

References 29 publications

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“…The microbial aggregates adhering to the three seagrass genera were distinct, which was similar to the studies conducted in the Western Indian Ocean (WIO; Hamisi et al 2007Hamisi et al , 2009Uku et al 2007), the microbial communities had related to the seagrass species to some extend. T. hemprichii with high levels of functional bacteria may induce by the higher organic nutrition in the plants, T. hemprichii as a species grow higher up in the inter-tidal zone with highly photosynthetic (Borum et al 2006).…”

Section: Distribution Of the Bacteria In Three Species Seagrassessupporting

confidence: 80%

Cultivation-dependent analysis of the microbial diversity associated with the seagrass meadows in Xincun Bay, South China Sea

et al. 2015

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Microbial communities have largely existed in the seagrass meadows. A total of 496 strains of the bacteria in the seagrass meadows, which belonged to 50 genera, were obtained by the plate cultivation method from three sites of Xincun Bay, South China Sea. The results showed that Bacillales and Vibrionales accounted for the highest proportions of organisms in all communities. The diversity of the bacteria in the sediment was higher than that associated with seagrass. Thalassia hemperichii possessed the highest abundance of bacteria, followed by Enhalus acoroides and Cymodocea rotundata. Robust seasonal dynamics in microbial community composition were also observed. It was found that microbial activities were closely tied to the growth stage of the seagrass. The microbial distribution was the lowest in site 3. The abundance of the bacteria was linked to the interactions between bacteria and plants, the condition of plant and even the coastal water quality and the nutrition level in the sediment.

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Section: Distribution Of the Bacteria In Three Species Seagrassessupporting

confidence: 80%

Cultivation-dependent analysis of the microbial diversity associated with the seagrass meadows in Xincun Bay, South China Sea

et al. 2015

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“…The rates ranged from 0.06 mg N m 22 d 21 in winter to a maximum of 1.51 mg N m 22 d 21 in summer, and are of similar magnitude to the only report of whole seagrass community in situ measurements of N 2 fixation from Pereg-Gerk et al (2002, for Halophila stipulacea in the Red Sea). The estimated N 2 fixation on the leaves ranging from 0.02 mg N m 22 d 21 to 1.35 mg N m 22 d 21 calculated in this study are within the range or even higher than those reported in tropical seagrasses (0-0.03 mg N m 22 d 21 , McRoy et al 1973;1.15-3.2 mg N m 22 d 21 , Capone et al 1979;0.48-2. Hamisi et al 2009). However, N 2 fixation was 1 order of magnitude lower compared to the only available previous report on the phyllosphere of P. oceanica of 15 mg N m 22 d 21 that was measured in excised whole leaves placed in the same type of chambers (Agawin et al 2016).…”

Section: In Situ Rates Of N 2 Fixation In the Different Chambersmentioning

confidence: 99%

Temporal and spatial variability of in situ nitrogen fixation activities associated with the Mediterranean seagrass Posidonia oceanica meadows

Agawin

Ferriol

Sintes

et al. 2017

Limnology & Oceanography

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This study provides the first extensive data on in situ rates of N2 fixation in minimally disturbed Posidonia oceanica meadows and their temporal and spatial variability along the Mallorcan coasts in the Mediterranean Sea. Benthic bell‐jar chambers were deployed underwater enclosing (1) natural P. oceanica shoots, (2) matted sediment of P. oceanica with the leaves carefully removed by clipping to assess the contribution of N2 fixation associated with leaves, and (3) adjacent unvegetated sediment to assess the contribution of N2 fixation by the sediment. In all of the chambers, N2 fixation varied seasonally, with highest rates during summer and lowest in winter. Average N2 fixation rates in chambers enclosing natural P. oceanica shoots ranged from 0.06 mg N m−2 d−1 to 1.51 mg N m−2 d−1 (0.004–0.107 mmol N m−2 d−1) in summer. Careful removal of leaves generally reduced N2 fixation rates by 16–89%. The N2 fixation rates in unvegetated sediments ranging from 0.01 mg N m−2 d−1 to 1.99 to mg N m−2 d−1 (7.1 × 10−4–0.14 mmol N m−2 d−1) have similar magnitudes in sediments with P. oceanica. This suggests that these sediments are “hot spots” for N2 fixation. Exploratory analyses of environmental factors that may influence N2 fixation rates highlight temperature and pore water total phosphorus concentrations as important factors.

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“…Seagrasses are known to harbor biofilms of highly diversified microbial communities (Bagwell et al, 2002;Crump and Koch, 2008;Hamisi et al, 2009;Weidner et al, 2000) which actively participate in the recycling of nutrients (Duarte et al, 2005). The epiphytic microbial communities of seagrasses may shift in response to environmental changes and both (plants and microbes) may respond in synchrony to changes in environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Assessing the ecological status of seagrasses using morphology, biochemical descriptors and microbial community analyses. A study in Halophila stipulacea (Forsk.) Aschers meadows in the northern Red Sea

Mejia

Rotini

Lacasella³

et al. 2016

Ecological Indicators

131

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Nitrogen fixation by epiphytic and epibenthic diazotrophs associated with seagrass meadows along the Tanzanian coast, Western Indian Ocean

Cited by 28 publications

References 29 publications

Cultivation-dependent analysis of the microbial diversity associated with the seagrass meadows in Xincun Bay, South China Sea

Cultivation-dependent analysis of the microbial diversity associated with the seagrass meadows in Xincun Bay, South China Sea

Temporal and spatial variability of in situ nitrogen fixation activities associated with the Mediterranean seagrass Posidonia oceanica meadows

Assessing the ecological status of seagrasses using morphology, biochemical descriptors and microbial community analyses. A study in Halophila stipulacea (Forsk.) Aschers meadows in the northern Red Sea

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