Sunday, May 1, 2016
Biodiversity is the variability found within a species, between species and the variability among ecosystems. It plays an irreplaceable role in our lives as we depend on biodiversity for many requirements including food, energy, medicine and other material. It also has a significant importance in the traditional culture, religion and social practices. Apart from the tangible and intangible resources that directly affects us biodiversity also provides priceless services as ecosystem services which are crucial to maintain the natural balances on earth. Therefore, maintaining the biodiversity in a natural state and allowing it to alter following the natural patterns is critical for the existence of all life in the biosphere.
However, in recent centuries humans have been altering the natural systems and endangering the biodiversity around them in a drastic manner resulting in a rapid loss of biodiversity. This has been intensified since the industrial revolution and many accepts that we are causing a mass extinction event. Currently biodiversity loss has been identified as one of the leading global environmental issues we are facing. Anthropogenic activities such as habitat loss and degradation, spread of invasive alien species, climate change, over exploitation and environmental pollution are the major drivers of the ongoing biodiversity loss.
Conservation biology is a crisis discipline that developed in recent decades as a response to this ongoing crisis of biodiversity loss with the aim of combating it. Conservation biologists are attempting to minimize the negative human impact on biodiversity and allowing the natural dynamics with a scientific approach. However, as anthropogenic causes are the main driving forces behind the ongoing biodiversity loss, the role of conservation biologists is becoming more challenging day by day.
Human population on earth has undergone a rapid expansion in the last centuries mainly with the recent development in health and agriculture. At the dawn of the 21st century the world population was around 6 billion but it reached 7.3 billion by 2015. Even though the rate of human population growth is declining at present, the magnitude of the current population is so significant that it is impacting on the earth in severe scales. Fulfilling the needs and wants of this huge population of one species is having a negative effect on many other species as well as ecosystems putting them on a knife-edge situation.
Many species are already facing a severe threat of extinction. The global and local red lists made and updated time to time are alerting the society including the conservation biologists on the species which are at the brink of extinction. However, conserving these species and minimizing their extinction risk is not easy as it has to be done in a way that does not interfere the human activities to an extent that would cause a negative reaction from the stakeholder communities. Therefore, conservation biologists have a challenge to maintain the social, economical and ecological balances in order to make conservation a reality.
Agricultural lands are expanding in certain areas to supply the food resource requirement of the human population and human settlements are similarly expanding. Altogether, with other human land-uses, these are consuming about 13 million hectares of natural forests annually and converting them to different land-uses. The expansion of human modified land-uses are pressing the wildlife to their survival and causing a conflict among humans and wildlife. In other areas, agriculture is becoming intensified using the novel agricultural practices and human settlements are becoming concentrated to urban areas generating higher pollution and causing a chain of negative effects on biodiversity. Over exploitation of biological resources, which is evident in many cases including the well known “fishing down the food web” are also throwing out the natural balance in ecosystems. Conservation biologists are facing the challenge of establishing a balance to these systems which is in favour of biodiversity but also fulfills the growing requirements of the human population in the 21st century.
Conservation is not an activity that can be achieved single-handedly. Conservation biologists require the support and commitment from various stakeholders to make a significant positive effect on the biodiversity. These stakeholders include local communities, government authorities, political movements, industries, funding agencies and many others. However, these stakeholders may not share the same objectives or views that the conservation biologists have. With their own agendas and targets, some of them are in a state of competition with the many competitors in a large population and some are trying to meet the demands of the growing population. This will be even more significant in developing countries where poverty and political unrest are common and widespread issues. Therefore, bringing these different minded stakeholders together and making a positive dialog between them is challenging for the conservation biologists and it requires many skills.
One thing we have to understand is that the world has already being changed drastically to meet the needs of the human population and the 21st century will not see any significant difference in this process. Understanding this, 21st century conservation biologists and the society must find ways to carry out their activities with a minimal effect on biodiversity thus the benefits of the biodiversity will be perpetual. In order to achieve this, novel methods must be identified and developed to attract and sustain biodiversity within human modified landscapes and incorporate them to the biodiversity conservation efforts. This is a challenging task for everyone including the conservation biologists as these methods will have to be applied for different situations and will require specific modifications for different cases. This also involves the challenge of overcoming the mental hurdle that would prevent us from seeing human-modified land-uses as different units from areas for conservation.
With the growing human populations, complex human life styles and novel needs of the 21st century humans, the conservation biologists and the society are in a very challenging position to minimise the loss of biodiversity and ensure its sustainability. Therefore, identifying these challenges and finding methods to overcome them are important in order to make conservation a reality.
Sunday, February 21, 2016
Among the billions of life forms around us, odonates or dragonflies and damselflies have been occupying only a small fraction of it with around 6,000 species currently known to science. The systematic study of odonates began with the birth of Linnaean taxonomy in 1758 and biologists and naturalists have been describing odonates around the world and assigning names for these species.
So, after the 257 years, where do we stand now?
Naming a species is the basic requirement in order to truly appreciate it and conserve it. Without giving a name to a species you can not study it, assess it for its conservation value or even discuss it. As odonates are wonderfully colourful, attractive, active, usually diurnal and comparatively large bodied insects, one might think that we already know enough of them after centuries of systematic studies and exploration.
However, questioning this view, 60 new species of odonates were described from the continent of Africa by a single paper authored by K. D. B. Dijkstra, J. Kippings and N. Mézière just at the end of 2015. If you think about the total number of odonates known from around the world, this has increased the number of species from around 1% single handedly. A very interesting fact regarding these discoveries is that all of them have been made in the field, not inside a lab while studying the molecules. And some of them were not made from remote jungles but from places no one has cared to look intentionally before.
The important point is, if that many African species were yet unknown to science until the last year, how many undescribed species might be there in the other regions? Especially, in the hottest biodiversity hotspots around the globe, including Madagascar, Indo-Burma, Sundaland, Philippines, Atlantic forests in Brazil and Western Ghats/Sri Lanka.
As a biologist working in Sri Lanka I am well aware that only seven new species and two new subspecies have been described from Sri Lanka since the year 2000. According to the odonata checklist published by K. A. Subramanian in 2014 and a recent paper by C. G. Kiran, S. Kalesh and K. Kunte, this number is only six species in the whole of India with only two in the Western Ghats.
So, are we done? No, not even close.
You can read the interesting facts about the new discoveries from Africa here.
Bedjanič, M., van der Poorten, N., Coniff, K. and Salamun, A. 2014. Dragonfly Fauna of Sri Lanka: distribution and biology with threat status of its endemics. Pensoft, Sofia. 321 pp.
Kiran, C.G., S. Kalesh & K. Kunte (2015). A new species of damselfly, Protosticta ponmudiensis (Odonata: Zygoptera: Platystictidae) from Ponmudi Hills in the Western Ghats of India. Journal of Threatened Taxa 7(5): 7146–7151;
Klaas-Douwe B. Dijkstra, Jens Kipping & Nicolas Mézière (2015). Sixty new dragonfly and damselfly species from Africa (Odonata). Odonatologica 44: 447-607.
Subramanian, K.A. (2014). A Checklist of Odonata of India. Zoological Survey of India, Kolkata.