Estuarine Science - Science topic

Hi João ,

The crab rings are widely used in brackish waters of India, especially from south-west coast for mud crab. Since this fishery is sustenance level, reports is very limited. Currently, we working on traps and pots of India, a review article on this underway. I'll share you once its published.

Best wishes,

Chinna

Effectively, the PLI softens the differences that exist between the evaluated metals, being able to deliver a misinterpretation of the real state of the sediments under study, but we must not forget that this index is only a tool that allows to unite results under a single value for a better compression of the system under study. Therefore, the first is an expert evaluation of each of the individual parameters and the PLI later to improve the understanding of the metals analyzed as a whole. An evaluation of metals in sediments can not be based only on the PLI is a complement to facilitate the overall interpretation.

Dear Jayachandran,

you mean all living beings? reaction is too different. But working at the lab of the Danube and Limans (Estuaries) we found several interesting facts. Even desalinated the Estuary never lose completely its marutime or brackish water fauna. Look, please, my last presented publication about the Sassyk ciliates fauna! As well  what happened with this ineresting freshened basin after desalination are gathered in our book (as well my site). If estuary is of some large river and practically fresh, so marine fauna can penitrate over the deep relict river bad and it can be the very upper part of this type Estuary. Moreover  in this relic river bad is concentrated hydrogen sulphide that is suitable for anaerobic organismes od marine origin. I wrote about the Dnieper-Bug Estuary. As about tides it can stimulate exchange of the organismes but is not comfortable for a stable fauna. Therefore in the locality of the Estuary with abruptly changing regime it will be enough poor fauna, eg especially if salinity will be changing from 1-2 over 5-7 promille diapazone and back.

Extra interesting can be redistribution of the primary production of phytoplancton that can be consumpted in the deeper layers and in benthos...

I have enough much books on the question, so if necessary, call me by RG mailing, Will send.

Andrey

 Dr Faizul Nisha  Thanks a lot. I am sure these will be a great helo to me.

Kind regards

Again. Thanky you very much, Mr William and Mr. Mahdi

Dear Victoria, I would have a first question before. How is the turbidity in your estuary? A very large amont of estuaries are turbid or even hyper turbid and this prevent this kind of estuary from blooming with phytoplankton. So the photosynthetic activity can be very much reduced or close to null because of the poor water transparency. So in turbid estuary it may be not so simple to disentangle the effect of pollutant from the effect of suspended mater unless you work in experimental conditions.

Try MNDWI water index with Landsat 5-8 / SPOT 5 imagery. 

I think Nypa can survive in mangrove in inlands also where tidal waves are frequent. Global Invasive species database says

"Nypa fruticans (nypa palm) inhabits estuarine habitats from Sri Lanka to the Ganges delta to the west Pacific. It grows up to 10 m tall and produces large buoyant propagules that are dispersed with ocean currents. It was intentionally introduced to Nigeria, and has since spread to Cameroon. In the Niger Delta it invades deforested and exposed mudflats and forms dense monospecific stands which outcompete native mangrove species. The lack of stilt roots, absence of leaf litter and dense structure reduce estuarine habitat and may negatively affect native biodiversity."

It looks much more like a seed

Dear Heron

It is very difficult to provide a range. It all depends on many factors such as salinity, depth, height of tides etc... as you know about them. A very broad figure may vary from 0.01 to 10. The attached paper may help you in many ways. 

I suppose by "over" you mean "before" or "above in the sediment". A normal sequence of processes is that denitrification occurs higher in the sediment column than methanogenesis. Denitrification zone is followed (in the downward direction) by zones of Mn and Fe reduction, then sulfate reduction, and then methanogenesis. Some overlap is normal, but I would be very surprised if you indeed have methanogens outcompeting nitrate reducers. What is the system you are studying and what is the evidence for methanogenesis and denitrification? 

We have often used conductivity as a conservative. For example, suppose we have only one streamflow measurement below the confluence with a tributary, and also have measurement of conductivity above and below the confluence and in the tributary. Then, using a simple mixing equation and assuming conductivity acts as a conservative, you can calculate the flows in the upper stream and in the tributary. We also use conductivity balances to assure that our flow measurements are correct. 

This works because total dissolved solids (TDS) which is a good conservative tracer is usually proportional to conductivity. In our day-to-day work we seldom actually estimate TDS, and simply use conductivity as if it was a concentration of a conservative material. 

Dear All,

Thank's so much for the answers and ideas. Very useful for my research.

Regard's

Zolhizir bin Daud

If the nutrient potential of the estuary is too (unnaturally) high, several people mentioned eutrophication, secondary production may drop (even precipitously) due to events like hypoxia and anoxia, harmful algal blooms, jellyfish predation on larval nekton, etc.  We already have too many "dead zones" due to sewage input, agricultural runoff, etc.  Don't think we want any more.

Can i know more about GLMmodel

Thank you for the answers. Based on your suggestions I searched some articles. The link below seems to be useful for better understanding.

Please look at this: Bratton, J.F., Colman, S.M., Thieler, E.R. and Seal, R.R.I. 2003. Birth of the modern Chesapeake Bay estuary 7.4 to 8.2 ka and implications for global sea-level rise. Geo-Marine Letters, v. 22, 188-197

My comment: The ca. 20 m rise is less likely.

Hello,

Here are some references:

Cheers!

Not related to this estuary, but papers from Spiteri et al. in 2008. are good source of knowledge on the topic in general.

Have a look at http://link.springer.com/book/10.1007/978-94-007-7019-5 it is a synthesis of the actual state of many Australian Estuaries and the perspectives for the future. I know they talk about acidification in few chapters.

Hello Jabir.

I think you are referring to Anammox bacteria (not Annamox).

I think these authors studied the Anammox in marine systems:

Rysgaard, S., Glud, R. N., Risgaard-Petersen, N. and Dalsgaard, T. (2004). Denitrification and anammox activity in Arctic marine sediments. Limnology and Oceanography 49(5): 1493-1502

Tage Dalsgaard, Bo Thamdrup, Laura Farías, Niels Peter Revsbech

Anammox and denitrification in the oxygen minimum zone of the eastern South Pacific

Limnology and Oceanography 01/2012; 57:1331-1346

Good luck with Anammox