Sediment biogeochemistry in an East African mangrove forest (Gazi Bay, Kenya)

Middelburg, Jack J.; Nieuwenhuize, J.; Slim, Frederik J.; Ohowa, Boaz O.

doi:10.1007/bf00000899

Cited by 108 publications

(78 citation statements)

References 38 publications

(51 reference statements)

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“…Within the R. mucronata species, increments were similar among the natural and reforested treatments, but significantly higher than in the bare treatment. N increase during the sampling period was most likely due to immobilisation (Middelburg et al, 1996) as a result of accumulation of microbial biomass and products of microbial activity, and their incorporation into humic compounds (Rice, 1982;Mfilinge et al, 2002). Melilo et al (1984) suggested that conservation of N by decomposers throughout the sampling period may lead to N accumulation, also evident from the decreasing C:N ratios.…”

Section: Discussionmentioning

confidence: 99%

Litter degradation and CN dynamics in reforested mangrove plantations at Gazi Bay, Kenya

Bosire

Dahdouh‐Guebas

Kairo

et al. 2005

Biological Conservation

100

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The main objective of this study was to assess how mangrove reforestation has influenced litter degradation and concomitant nutrient dynamics in previously deforested plantations. Dynamics of nutrients (carbon, nitrogen and C:N ratios) in decomposing leaves of conspecific species were investigated with litterbags in Sonneratia alba and Rhizophora mucronata reforested treatments using appropriate bare and natural less disturbed treatments as controls. Bare treatments had the lowest decay rates (Kd À1) and thus the highest t 50 values (when 50% of the original weight had been decomposed) for both species. The contrary was true for natural treatments, while both parameters were intermediate in reforested treatments, suggesting that other than direct litter input, reforestation has modified site conditions which have enhanced organic matter decomposition. There were significant seasonal differences in decay rates for treatments within the R. mucronata species, with rates being higher during the wet season with accompanying lower t 50 values. Decay rates were overall higher (P < 0.05) in the S. alba species and as a result no litter was retrieved from its natural treatment by the 5th week. Higher amphipod colonisation was observed in reforested and natural treatments than bare treatments, which may have contributed to higher decay rates in the former. There were significant differences (P < 0.05) in N concentration among treatments with natural and reforested treatments having similarly higher concentrations than bare treatments in both seasons. C:N ratios (an important determinant of nutritional leaf quality) were also similarly low in natural and reforested treatments and higher in bare treatments. Mangrove reforestation thus seems to have enhanced litter degradation and concomitant nutrient remineralisation, suggesting that other than species litter quality, tidal inundation and seasonal factors, specific stand management regimes play an important role in determining the efficiency of these ecological processes in mangrove ecosystems.

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Section: Discussionmentioning

confidence: 99%

Litter degradation and CN dynamics in reforested mangrove plantations at Gazi Bay, Kenya

Bosire

Dahdouh‐Guebas

Kairo

et al. 2005

Biological Conservation

100

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“…These conditions result from complex sedimentary processes that are driven by a large number of interacting physical and biological factors, such as the geological and physiographical characteristics of the area, climatic conditions and the nature of mangrove vegetation (Middelburg et al 1996;Marchand et al 2004). On a small scale, the mangrove root habitat is exposed to extreme changes on a daily basis due to tidal cycles (Gomes et al 2010).…”

Section: Mangrovesmentioning

confidence: 99%

Characteristics of meiofauna in extreme marine ecosystems: a review

et al. 2017

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Extreme marine environments cover more than 50% of the Earth's surface and offer many opportunities for investigating the biological responses and adaptations of organisms to stressful life conditions. Extreme marine environments are sometimes associated with ephemeral and unstable ecosystems, but can host abundant, often endemic and welladapted meiofaunal species. In this review, we present an integrated view of the biodiversity, ecology and physiological responses of marine meiofauna inhabiting several extreme marine environments (mangroves, submarine caves, Polar ecosystems, hypersaline areas, hypoxic/anoxic environments, hydrothermal vents, cold seeps, carcasses/sunken woods, deep-sea canyons, deep hypersaline anoxic basins [DHABs] and hadal zones). Foraminiferans, nematodes and copepods are abundant in almost all of these habitats and are dominant in deep-sea ecosystems. The presence and dominance of some other taxa that are normally less common may be typical of certain extreme conditions. Kinorhynchs are particularly well adapted to cold seeps and other environments that experience drastic changes in salinity, rotifers are well represented in polar ecosystems and loriciferans seem to be the only metazoan able to survive multiple stressors in DHABs. As well as natural processes, human activities may generate stressful conditions, including deoxygenation, acidification and rises in temperature. The behaviour and physiology of different meiofaunal taxa, such as some foraminiferans, nematode and copepod species, can provide vital information on how organisms may respond to these challenges and can provide a warning signal of anthropogenic impacts. From an evolutionary perspective, the discovery of new meiofauna taxa from extreme environments very often sheds light on phylogenetic relationships, while understanding how meiofaunal organisms are able to survive or even flourish in these conditions can explain evolutionary pathways. Finally, there are multiple potential economic benefits to be gained from ecological, biological, physiological and evolutionary studies of meiofauna in extreme environments. Despite all the advantages offered by meiofauna studies from extreme environments, there is still an urgent need to foster meiofauna research in terms of composition, ecology, biology and physiology focusing on extreme environments.

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“…= Natural; A = Artificial; F = Fertilizer; P = Pesticide; Stock density = shrimp; * = exceptions occur (further explained in text) Sources management regimes: Janssen and Padilla (1996), Stevenson (1997), Gilbert andJanssen (1998), Sofiawan (2000), Rönnbäck (2001), Macintosh et al (2002), , Walters (2005b), Primavera et al (2007), Sources policy: Government of Indonesia (1999,2010,2012), Ministry of Forestry Indonesia (2012). Sources ecological characteristics: Schrijvers et al (1995), Middelburg et al (1996), Matthijs et al (1999), and .…”

Section: Comparison Of Mangrove Management Regimementioning

confidence: 99%

“…Sources ecological and biophysical characteristics: Schrijvers et al (1995), Middelburg et al (1996), Matthijs et al (1999), , and .…”

Section: Converted Mangrovesmentioning

confidence: 99%

Effects of different management regimes on mangrove ecosystem services in Java, Indonesia

Oudenhoven

Siahainenia

Sualia³

et al. 2015

Ocean & Coastal Management

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Sediment biogeochemistry in an East African mangrove forest (Gazi Bay, Kenya)

Cited by 108 publications

References 38 publications

Litter degradation and CN dynamics in reforested mangrove plantations at Gazi Bay, Kenya

Litter degradation and CN dynamics in reforested mangrove plantations at Gazi Bay, Kenya

Characteristics of meiofauna in extreme marine ecosystems: a review

Effects of different management regimes on mangrove ecosystem services in Java, Indonesia

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