The Benefits Of Biodiversity
    By Caitlin Kight | January 22nd 2012 12:40 PM | 2 comments | Print | E-mail | Track Comments
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    If you've recently spent some time in a "greenspace"--an area of undeveloped landscape--you may have found that it improved your mood, reduced feelings of stress, and left you feeling more relaxed. These are only a few of the benefits of natural areas, which have also been shown to increase lifespan, reduce the length of time needed to recover from surgery, and improve cognitive abilities. Despite the growing amount of attention paid to these physical and mental effects of greenspaces, there has been little to no work investigating why natural areas have this positive impact on human visitors--until now.

    (A city park--one example of an urban greenspace)

    In the latest issue of the journal BioScience, an international research team (including collaborators from the University of Sheffield, the University of Copenhagen, De Montfort University, the University of Kent, the University of Tennessee--Knoxville, and the University of Exeter) describes a recent project undertaken to test the hypothesis that people respond favorably to greenspaces because of the biodiversity contained within them. The researchers focused their efforts on 34 study sites located along the 5 rivers that run through Sheffield, UK. In each location, they surveyed local bird, butterfly, and plant populations in order to measure species richness. They also interviewed visitors to the natural areas in order to gauge which site characteristics might be responsible for "psychological well-being," as reported by the visitors themselves.

    (Location of Sheffield, which, with a population of 520,700, is the UK's 5th largest city)

    Questionnaires explored two major sources of the potentially beneficial impact of greenspaces: their "restorative" nature, which helps visitors bounce back from mental fatigue, and their contribution to a "sense of place," deriving from individuals' emotional attachments with particular locations and the resulting importance of those places in forming a sense of identity.

    As hypothesized, the well-being of greenspace visitors was positively related to the biodiversity of all three taxonomic groups. However, in an unforeseen twist, the relevant value was not actual biodiversity, as assessed by the researchers themselves, but the perceived biodiversity reported by survey respondents. Surprisingly, the relationships between well-being and actual species richness were inconsistent: While people responded positively to higher levels of avian biodiversity, they responded negatively to plant diversity and neutrally to fluctuations in butterfly numbers.

    In reality, numbers of bird, butterfly, and plant species varied independently of each other across the sites. Values estimated by visitors were highly correlated, though, suggesting that greenspace users may use one set of cues to estimate the diversity of all classes of local species. The authors of the study suggest that visitors' estimates may reflect awareness of certain key environmental features--the presence of a particular charismatic species, for instance, or abundance of wildlife rather than diversity; the exact mechanism still requires clarification. Regardless, one pattern is clear: Sheffield's citizens are not very well informed about their local flora and fauna. Of all people surveyed, only 2 could correctly identify all species shown to them in a series of 12 photographs (4 each of birds, butterflies, and plants); approximately a quarter of those questioned were unable to name even one.

    (A wren, Troglodytes troglodytes--one of the most common and widespread species of birds found across the 34 study sites. Blackbirds, Turdus merula, and wood-pigeons, Columba palumbus, were also frequently observed. Common plant species included bramble, Rubus fruticosus, dandelion, Taraxacum agg., and sycamore, Acer pseudoplatanus, while whites, Pieris spp., and the speckled wood, Pararge aegeria, were the most encountered butterfly species.)

    Importantly (though not surprisingly), the researchers found a clear correlation between an individual's identification skills and his/her ability to accurately estimate biodiversity in the study site. This suggests that there could be a tangible benefit to preserving or improving biodiversity in public greenspaces--but only if such efforts are coupled with education programs equipping people with basic species recognition skills. Under such scenarios, visitors would be better able to assess the richness of local wildlife species such that, in areas with higher levels of biodiversity, they would experience greater improvements to well-being. As the authors put it, this would "[unlock] win-win scenarios in which the design and management of greenspaces [could] maximize both biodiversity conservation and human well-being."

    With a larger proportion of the population able to perform basic species identification, a beneficial side effect of natural history education might be a more widespread recognition of the often depauperate nature of urbanized habitats. This awareness could fuel, and/or add momentum to, further conservation efforts.


    Dallimer, M., Irvine, K.N., Skinner, a.M.J., Davies, Z.G., Rouquette, J.R., Maltby, L.L., Warren, P.H., Armsworth, P.R., and Gaston, K.J. 2012. Biodiversity and the feel-good factor: understanding associations between self-reported human well-being and species richness. BioScience 62(1): 47-55.

    Thanks to the following websites for providing the images used in this post:


    Gerhard Adam
    Why does this sound like the researchers completely missed the boat and then took a detour?

    It would appear that biodiversity had nothing to do with people's attitudes, but rather that it was the obvious opportunity to relax and get away from the human social/societal pressures.  That seems to be borne out by the actual reactions of individuals and accounts for why their "perceived" sense of biodiversity had no relation to "actual" biodiversity.

    From this they come to the startling conclusion that an individual's ability to identify birds or species improves their ability to estimate biodiversity.  What's startling about this, is that it is so completely irrelevant to anything.  Are we looking at getting more accurate estimates, or trying to explain the relaxing effect?

    Ultimately they conclude that better estimates lead to better relaxation?  Based on what? 

    I would argue that these ideas are completely irrelevant to anything, since actual biodiversity isn't likely to have much positive effect regardless of the circumstances.  This is especially true, when an artificial environment like a park is involved.  If it is simply being argued that people like birds and butterflies, then I'm not clear on what is being studied here.
    Mundus vult decipi
    I  met many children in the Dominican Republic (outside of the cities) whose families depended on wild plants for medicine. I was amazed at how much they knew and how they could identify specific species of plants. I wonder if they could also appreciate and enjoy their natural environment more than the city kids and the American suburban kids. Even growing up with family members who were very knowledgable about plants,  I did not know how to identify many plant species until I went to college. I think there should be more educational programs that get kids interested in various plant and animal species by not only showing their beauty but also by showing them the various way they can be utilized (eg., for play, art).