Thursday 3 November 2016

We all need to budget- but how do coral reefs ?

Coral reefs are a very complex study system, and also could be considered one of the most interesting systems on the planet, and the coral animal itself is no less complex and interesting. For many years they have been a large focus for marine biologists, and with the increasing risk from climate change related environmental stress, the interest in them has only further increased.
Exploring an animals energetic budget, and looking at how resources are differently allocated in healthy animals verse stressed ones has been widely studied in biology. In this review by Lesser (2012), many year (even decades) of literature is reviewed in order to determine how robust the studies on coral energetic budgeting actually are. Several models are explored such as the Dynamic energy budgeting (DEB) and metabolic theory of ecology (MTE) models are assessed for there suitability to be applied to corals, both these models claim to give a comprehensive description of the organismal performance of all life history stages, based on the scaling of metabolic rate, under varying conditions.
Lesser explains some major flaws with many published studied on energy budgeting in corals, with many using indirect measures , such as active chlorophyll fluorescence, which assesses the proportion of functional PSII units, this approach can be useful but has been used in a way that the results where misinterpreted finding and never addresses corals under different stresses making the work done almost redundant.
As well as this many studies don't account for different types of metabolisms (even during a 24 hr period), with many corals switching to anaerobic respiration, this then gives a misrepresentation of the energy used as they do not consider anaerobic metabolites in the energy budgeting report.
Lesser explores a few different models, and each time has the opinion that although the work my be done well, they either 1) assume too many inapplicable assumptions or 2) confound many different factors together without actually determining what is actually changing energetically.
This review paints a nice story of all a lot of the previous work on carbon budgeting in corals, and highly suggests the amount of redundant work (at no fault of the scientists) due to the complexity of coral reefs. With much of the work on corals begging to shift to favor the 'omics', this important aspect of coral biology is being forgotten about. I think this is an area which will be highly beneficial for us to know and understand but with the all the current models all falling down we need a robust, comprehensive model which is applicable to corals, which accounts for their metabolic complexity.
It is clear for this review that there is still a lot that we don't know about corals, their health and there ability to metabolically adapt to changing conditions.
Reviewed paper-
Lesser, M. P. (2012). Using energetic budgets to assess the effects of environmental stress on corals: Are we measuring the right things? Coral Reefs32(1), 25–33. doi:10.1007/s00338-012-0993-
 http://link.springer.com/article/10.1007/s00338-012-0993-x

3 comments:

  1. Hi Natasha,

    Interesting read - thank you for highlighting some of the flaws used in previous research. Often could be found disheartening to scientists for work to be deemed as 'redundant' however, it is completely necessary to 'keep up with the times' in an ever changing and advancing science such as coral biology and health.
    A paper I have been looking at recently uses fluorescence to assess photosynthetic capability so it is interesting to think about how that may not be the best model to use- you mentioned that Lesser has highlighted that new models are needed and there is still much work to do - did he hint at any alternative models that could be used rather than fluorescence? Or perhaps a way to adapt this method?

    Thank you for your review, i found it very helpful with regards to other papers I am currently looking at.
    I look forward to your response,

    Ellie

    ReplyDelete
  2. Hi Ellie,
    Thanks for your reply, in this review he did refer to updating models which don't only refer to one metabolite and don't assume that corals have fixed levels of proteins, carbohydrates and lipid. Although he doesn't propose another model, it is an interesting review as it highlights the complexity of coral biology. I have had a quick look though the literature and this review is cited 11 times which is not particularly high but these paper are attempting to model the carbon flow in some cnidarians but not necessarily corals, it would be nice to explore these and see if any more suitable models are determined.

    Thanks
    Natasha

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  3. Hi Natasha, interesting seeing how so many years of work can just be disregarded like that!

    I have a hypothetical question for you based on the review. Do you think there may be a chance that research in this new "Omics" area may be redundant one day and disregarded in the same way as this research has?

    Thanks!

    ReplyDelete

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