Tag Archives: ecosystem services

New study: protected areas conserve mangroves and avoid blue carbon emissions

Kate Fuller (Marine Photobank) http://www.grida.no/photolib/detail/young-red-mangrove-tree-in-the-benner-bay-mangrove-marine-sanctuary-virgin-islands_5c521

Mangroves are an important storehouse of carbon. Source: Kate Fuller (Marine Photobank) http://www.grida.no/photolib/detail/young-red-mangrove-tree-in-the-benner-bay-mangrove-marine-sanctuary-virgin-islands_5c521

What’s a good strategy to combat climate change and save species simultaneously? One possible approach is to focus on protecting lands that store lots of carbon and that also provide excellent habitat. A flagship example of this type of ecosystem is the mighty mangrove. Mangroves provide an incredible wealth of ecosystem services: they serve as habitat for species, and even protect coastal areas from storms. Mangrove root structures offer unique underwater habitat, safeguarding breeding grounds for fish that local people depend on. Furthermore, these coastal ecosystems store a vast wealth of carbon. The carbon that is stored in mangroves (and other coastal and marine areas) is known as blue carbon. The carbon isn’t actually blue, of course. The term blue carbon is used to distinguish the carbon stored in coastal ecosystems from that stored in terrestrial ones. Blue carbon is found worldwide and is perhaps an underappreciated part of a solution to combat global climate change.

Global distribution of blue carbon. http://thebluecarboninitiative.org/category/about/blue-carbon/


Using policies, how can we harness the power of mangroves to store carbon and deliver climate mitigation benefits (not to mention climate adaptation benefits such as buffering from storms)? One approach is to set aside mangroves as protected areas. By drawing boundaries around mangrove habitats and preventing coastal development, perhaps we can realize some additional benefits in the form of blue carbon storage. This approach is worth investigating: are protected areas actually effective at preserving mangroves that store carbon? The first study to examine this question was published this week in Ecological Economics (Miteva et al. 2015). Miteva and her team used a quasi-experimental approach, incorporating matching and difference-in-differences methods. These approaches take into consideration the non-random locations of protected areas on the landscape. Simply comparing protected to unprotected areas would not yield accurate estimates of the causal effects of protected areas. Using matching (with both covariates and propensity scores in this case) allowed researchers to compare “apples to apples,” comparing villages that were protected with similar villages that were unprotected.

The researchers used covariates, factors correlated both with the treatments and outcomes, to select appropriate control villages. The covariates they chose included: the distance to markets (ports and cities), agricultural suitability proxies (length of rivers, slope, elevation), and socio-economic factors (e.g. poverty). They also examined how both marine protected areas (MPAs) and species management areas (SMAs) fared in terms of effectiveness. After completing a series of different statistical manipulations and robustness checks, Miteva and her team demonstrated unequivocally that overall, protected areas were significantly effective. In particular, MPAs were effective at reducing mangrove loss from both 2000 to 2006 and 2000 to 2010. However, species management areas were less effective – they did not have a significant effect during either time period.

mangrove pa

Overall, the mangroves that were not lost because of the policy intervention of protected areas stored 13 million megatons of carbon emissions. According to the researchers’ estimates, this is equivalent to $544 million (using the social cost of carbon) and equal to taking 344,000 cars off of the road. This study is an excellent contribution to the literature, as it is the only and most current large scale evaluation of protected areas’ impacts on blue carbon. One suggestion to improve future evaluation studies is to include or control for the effects of additional policies, including changes to protected areas and other conservation interventions. At least seven known policies have changed the size or status of protected areas in Indonesia, many of which have affected coastal protected areas (see PADDDtracker.org). Although the known number of instances of protected area downgrading, downsizing, and degazettement (PADDD) events is low in this nation, it is possible that there are many other undiscovered instances. It is important for researchers to continue to explore and document these changes and consider them in analyses. If considered carefully, the incorporation of protected area dynamics could offer new insights to the evaluation literature and improve estimates of protected area performance. 

Instances of protected area downgrading, downsizing, and degazettement (PADDD) in Indonesia. http://www.padddtracker.org/countries/IDN

Instances of protected area downgrading, downsizing, and degazettement (PADDD) in Indonesia. Key: green = downsizing,; orange = degazettement; yellow highlight = proposed PADDD. http://www.padddtracker.org/countries/IDN


Miteva, D. A., B. C. Murray, and S. K. Pattanayak. 2015. Do protected areas reduce blue carbon emissions? A quasi-experimental evaluation of mangroves in Indonesia. Ecological Economics 119:127–135. http://www.sciencedirect.com/science/article/pii/S0921800915003419

What has nature conservation done for me lately?

This is the eighth in a series of weekly blog posts covering conservation topics with a focus on protected areas and the laws and institutions that support them (or don’t).

Great Smoky Mountains National Park - the most visited National Park in the US in 2014 http://www.npca.org/parks/great-smoky-mountains.html

Great Smoky Mountains National Park – the most visited National Park in the US in 2014 http://www.npca.org/parks/great-smoky-mountains.html

Nature conservation: is it something that we simply like to do, or something that we need? Many may think of nature conservation programs as “nice” or “token” ideas that we could do without. However, many studies have shown that nature provides direct benefits to people everyday. Furthermore, these benefits are enhanced by policies that focus on setting aside protected lands and waters to conserve species. Protected areas may cost the government or locals to establish and maintain, but the benefits that they deliver are likely to be worth the investment. Here are a few examples of the direct benefits provided by nature and protected areas (with some videos).

1. Protected areas provide outlets for tourism, driving the local and global economy

A recent study, the first global analysis of protected area tourism, found that terrestrial protected areas receive over 8 billion visits per year! Using this figure, which is likely an underestimate, researchers discovered that this visitation generates about $600 billion USD annually directly within nations where visitation occurs plus an additional $250 billion USD in consumer surplus. Estimates may be imprecise, but authors acknowledge that they are within the right order of magnitude and in line with previous estimates. This finding is particularly striking, as only about $10 billion is spent on managing and establishing protected areas annually. Given the direct benefits that protected areas provide to society in terms of tourism and associated economic benefits, it stands to reason that much more funding could be allocated toward supporting protected areas. The comparison between what we spend and what we get is almost laughable; protected areas deliver direct (not to mention indirect) financial benefits on the order of 60 to 80 times the investment. However, revenue generated from and spending on protected areas are not evenly distributed globally; most visitation to parks is within the US and UK. Protected areas in these nation already benefit from having extra cash to spend on management. It would be interesting to analyze the intersection between biodiversity distribution and nature-based tourism to determine to what extent the presence of rich biodiversity drives tourism. My suspicion is that higher biodiversity may drive some tourist activities (e.g. Costa Rica), but the most profitable tourism sites will be located in accessible, populated places that provide plenty of amenities.

2. Protected areas provide educational experiences

Indigenous Protected Areas in Australia support tourism and also provide educational programs for local children to help them learn about their history. Check it out:

3. Protected areas may reduce poverty in local areas

Protected areas have been controversial in some places, with some suggesting that they lead to the displacement or disenfranchisement of local communities. While this has indeed occurred in nations including India, the effects of protected areas on poverty are likely to vary by country. One study in Bolivia found that protected areas contributed to poverty alleviation. Individuals living nearby protected lands had lower levels of poverty (as measured by income, education, health, among other variables) than individuals living further away. This study is particularly credible, as it uses a rigorous statistical approach to control for confounding factors and isolate the actual effect of protected areas on livelihoods. The authors caution, however, that the results are not globally generalizable. Future studies should take a national or sub-national approach to investigate protected areas’ impacts on poverty.

4. Protected areas provide direct health benefits

Natural systems, such as forests, provide a buffer for diseases. One new study focused in Brazil found that people living nearby protected areas are healthier. Rates of malaria, acute respiratory infection, and diarrhea were much lower when environmental protection was stricter. The study also modeled some scenarios and found that if environmental protection were expanded or if roads and mines were restricted, health would improve. Furthermore, a very exciting study from Stanford found that after subjects walked in a wooded area (as compared to walking along a highway) they ruminated less – in other words, a quick walk outside in a natural area led to a more relaxed state of mind. Subjects stopped worrying or focusing on negative thoughts. As rumination has been linked with depression, this study suggests that taking a quick walk in your nearest urban park or getting out of the city for a day can have serious positive repercussion for your mental health.

5. Protected areas allow for the enjoyment of nature

Sometimes you just need to get out of urban jungle and get outside into nature. The #NoWalls initiative captures this perfectly!

Overall, nature can provide health, wealth, learning experiences, and just plain fun. How do you enjoy or benefit from protected areas? Comment below