This paper examines how the core principles of landscape ecology — traditionally applied to terrestrial systems — can be extended to aquatic environments with significant benefits for conservation and natural resource management. Drawing on Wiens (2002) and Fausch et al. (2002), the paper argues that landscape ecology's six principles apply equally to riverine and stream systems. It demonstrates how adopting a broader spatial and temporal perspective, informed by landscape theory, can help scientists and managers address the extinction of stream fishes, manage sport and commercial fisheries, prevent invasions by hostile species, and respond to the long-term threats of climate change.
Landscape ecology deals with the spatial influence and impact of matter on ecological processes. Its focus encompasses the ecological influence of the location of a given object, the ecological influence of that object in relation to other — not necessarily similar — objects, and the influence of these relationships across various spaces and periods of time.
Landscape ecology has generally focused on terrestrial matter, with water bodies such as rivers and streams treated as subcomponents of the terrestrial system. Wiens (2002), however, argues that the principles of landscape ecology can be applied equally to the study of aquatic systems and that, as a result, landscape ecology can be used to great advantage to promote and expand inquiry into aquatic environments.
The six principles of landscape ecology are as follows: (1) patches vary in quality; (2) patch boundaries influence flow; (3) patch context is important; (4) connectivity is important; (5) organisms are important; and (6) scale is essential. All of these principles apply equally to aquatic entities as they do to terrestrial ones. While riverine landscapes differ from land-based landscapes in various ways, the differences are not so significant that applications cannot be extended from one domain to the other.
In fact, the water that links riverine elements may, because of its density and viscosity, make it an ideal setting in which to investigate and apply landscape ecology principles. By viewing rivers as landscapes, aquatic ecology can contribute to landscape ecology just as landscape ecology can contribute to aquatic ecology. In this way, both fields stand to be expanded.
Fausch et al. (2002) apply the principles of landscape ecology to argue for better conservation of stream fishes. Much of aquatic observation, they contend, is limited by the narrow, ground-level perspective that sees only a small portion of the riverbed at one time, rather than the continuous, landscape-scale view that would be necessary for more effective conservation of aquatic biota. Scientists need a larger spatial and temporal perspective in order to generate better solutions to the currently high extinction rate of aquatic species.
Landscape ecology, with its emphasis on large-scale patterns and connectivity, is well suited to providing scientists with enhanced insights. Drawing on the model developed by Isaac Schlosser and colleagues — who integrated landscape theory with an aquatic context and proposed that fish movement synchronizes physical and biotic systems in streams — Fausch et al. (2002) suggest that this model can be used to propose a new approach to stream fish ecology and preservation.
They propose five principles for more effective research and conservation of stream fishes and demonstrate how the integration of landscape ecology into aquatic environments can assist scientists in at least four areas: (1) improving habitat for endangered and threatened species; (2) preventing invasions by hostile non-native species; (3) managing ecosystems to sustain fish populations for sport or commercial fishing; and (4) addressing both long-term and immediate threats posed by climate change.
To be most effective in conserving fish and slowing their rate of disappearance, researchers, scientists, biologists, conservation managers, and all those concerned with their maintenance need to study stream fishes within the full scope of their life history and the environments in which they function. Doing so requires more than a narrow, ground-level view; it requires integrating landscape theory with aquatic ecology in order to address structural questions and implement management strategies at a broader scale than has previously been attempted.
This integrated approach demands the kind of bird's-eye perspective that natural resource managers and decision makers can use to inform policy and guide conservation efforts across entire stream networks rather than isolated reaches. Such a perspective allows for interventions that are more comprehensive, better coordinated, and more likely to produce lasting results for both biodiversity and human use of aquatic resources.
"Four practical conservation management applications"
Wiens, J. A. (2002). Riverine landscapes: Taking landscape ecology into the water. Freshwater Biology, 47, 501–515.
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