Carrying capacity analysis
This article provides an introduction to the concept of carrying capacity in the context of Integrated Coastal Zone Management (ICZM). It reflects the idea that exceedance of carrying capacity compromises the goods and services provided by the natural environment and may undermine the long-term sustainability of coastal development.
Contents
The notion of carrying capacity
The concept of carrying capacity is rooted in a notion of “limits to growth”. The notion of carrying capacity or sustainability yield has become a basic criterion of sustainability. Carrying capacity can be defined as “the growth limits an area can accommodate without violating environmental capacity goals” (Ortolano, 1984)[1]. Ecosystems and populations have a limited capacity to cope with environmental stress; above a certain amount of stress there may be detrimental effects for ecosystem functioning and for the services ecosystems provide to society. Policies regulating human activities and anticipating environmental impacts can assist in maintaining carrying capacity limits. For this purpose it is necessary to translate ecosystem limits into anthropogenic limitations and management controls.
The notion of “limits” has several conceptual problems, including ecosystem complexity, lack of data, scientific uncertainty, and differences in interpretation. Limits are, above all, conceptual constructs. It is therefore often difficult to identify clear geographical boundaries of natural ecosystems, much less to determine precise growth limits.
Things become more complicated when moving from limits for specific parameters or resources to carrying capacity limits for a whole area, as in the case of tourism carrying capacity. Limitations for critical ecological resources such as freshwater, land availability, habitat quality, or waste assimilation need to be defined while cumulative stress from tourism, agriculture, fisheries, urbanisation, and industry must also be considered. Carrying capacity analysis therefore requires significant scientific, technological, institutional, and financial resources.
Tourism carrying capacity
There is often a relationship between exceedance of carrying capacity limits and the deterioration of an area’s ability to support recreation. This may differ from the actual physical deterioration of the environment, since visitors’ perceptions and expectations also play an important role. Tourism carrying capacity is therefore determined not only by ecological conditions and the general deterioration of an area, but also by visitors’ experiences and local community values.
Different components of carrying capacity—physical-ecological, socio-cultural, political-economic, and perceptual—suggest the existence of different types of limits which do not necessarily coincide. Usually the most limiting factors provide the basis for management decisions.
For example, a coastal destination may still be ecologically functional, but overcrowding, traffic congestion, water shortages, or conflicts with local residents may indicate that tourism carrying capacity has already been exceeded.
The use of carrying capacity in tourism planning has undergone significant criticism due to difficulties during implementation, such as lack of scientific objectivity, weak relationships between use and impact, and the futility of trying to determine a desirable unique number of visitors (Coccossis and Mexa, 2004[2]).
More recently, emphasis has shifted toward management policies that maintain environmental quality and visitor satisfaction rather than toward determining absolute limits of use. Alternative concepts reflecting Management-by-Objectives approaches include Visitor Impact Management, Limits of Acceptable Change, Visitor Experience and Resource Protection.
These approaches focus less on the question “How many visitors are too many?” and more on “What level of change is acceptable, and under which conditions?”
Carrying capacity as part of a planning process for coastal areas
The measurement, assessment, and implementation of carrying capacity should be considered as a process within the broader planning framework for coastal areas. Defining carrying capacity requires the formulation of goals, objectives, and policy measures, as well as the development of a shared vision for local development. The process is cyclical and repetitive and includes several steps: identification of issues, definition of critical factors, selection of indicators, establishment of thresholds and desired conditions, formulation of goals and objectives, elaboration of alternative courses of action, impact assessment, implementation, and revision.
In Integrated Coastal Zone Management (ICZM), carrying capacity is closely linked to the management of competing coastal uses such as tourism, fisheries, ports, housing, agriculture, and nature conservation. Carrying capacity therefore becomes not only an environmental question, but also a governance issue concerning how limited coastal space and resources are allocated.
The assessment of carrying capacity needs to be embedded in democratic strategic planning and requires participation of all major actors, including local communities, economic sectors, public authorities, and environmental organisations (Coccossis and Mexa, 2004[2]). Stakeholder participation is essential because acceptable levels of change are often socially negotiated rather than scientifically fixed.
Monitoring–the use of indicators
Monitoring is an essential component of carrying capacity analysis and supports site planning, policy-making, and the review of management performance. Monitoring indicators provide important opportunities for defining and implementing carrying capacity. A core set of indicators reflecting pressures and the state of key factors—such as water availability, sea pollution, habitat loss, beach erosion, wastewater loads, or visitor density—may be used to identify the violation of capacity limits.
Indicators should be simple, measurable, and relevant to local management objectives. They should also allow comparison over time so that trends can be detected early and corrective action can be taken before irreversible damage occurs.
Monitoring is effective only if it is linked to management action. Indicators alone do not protect coastal systems unless institutions have the capacity and political willingness to respond when thresholds are exceeded (Olsen, 2003[3]).
Related articles
- Integrated Coastal Zone Management (ICZM)
- Resilience and resistance
- The Tragedy of the Commons
- Multifunctionality and Valuation in coastal zones: concepts, approaches, tools and case studies
References
- ↑ Ortolano, L. (1984), Environmental Planning and Decision Making, John Wiley and Sons, New York
- ↑ 2.0 2.1 Coccossis, H. and Mexa, A. (eds.) (2004), The Challenge of Tourism Carrying Capacity Assessment: Theory and Practice, Ashgate, Aldershot
- ↑ Olsen, S.B. 2003. Frameworks and indicators for assessing progress in integrated coastal management initiatives. Ocean & Coastal Management 46: 347–361
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