Pike CNHI - Pennsylvania Natural Heritage Program

INTRODUCTION
Our natural environment is key to human health and sustenance. A healthy environment provides clean air
and water; supports fish, game and agriculture; and furnishes renewable sources of materials for countless
aspects of our livelihoods and economy. In addition to these direct services, a clean and healthy
environment plays a central role in our quality of life, whether through its aesthetic value (found in forested
ridges, mountain streams and encounters with wildlife), or in the opportunities it provides for exploration,
recreation, and education. Finally, a healthy natural environment supports economic growth by adding to the
region’s attractiveness as a location for new business enterprises, and provides the basis for the recreation,
tourism, and forestry industries--all of which have the potential for long-term sustainability. Fully functional
ecosystems are the key indicators of a healthy environment and working to maintain ecosystems is essential
to the long-term sustainability of our economies.
An ecosystem is “the complex of interconnected living organisms inhabiting a particular area or unit of
space, together with their environment and all their interrelationships and relationships with the
environment” (Ostroumov 2002). All the parts of an ecosystem are interconnected--the survival of any
species or the continuation of a given natural process depends upon the system as a whole, and in turn,
these species and processes contribute to maintaining the system. An important consideration in assessing
ecosystem health is the concept of biodiversity. Biodiversity can be defined as the full variety of life that
occurs in a given place, and is measured at several scales: genetic diversity, species, natural communities,
and landscapes.
Diversity typically allows species or communities to adapt successfully to environmental changes or
disease. Genetic diversity, for example, refers to the variation in genetic makeup between individuals and
populations of organisms. Though sugar maple (Acer saccharum) may be found in many areas of
Pennsylvania, those in Pike County likely have a different genetic makeup than those in Philadelphia
County; this allows these trees to survive in the unique conditions in which they grow. In order to
conserve genetic diversity, plants native to an area from local genetic stock should be used as much as
possible in both private and public plantings in Pike County. It is also important to maintain natural
patterns of gene flow; this is made possible through the preservation of migration paths and corridors
across the landscape, and through encouraging the dispersal of pollen and seeds among populations
(Thorne et al., 1996). Furthermore, declines in native species diversity can alter ecosystem processes such
as nutrient cycling, decomposition, and plant productivity (Naeem et al., 1999, Randall, 2000). Because
of the interdependent nature of our natural systems, including those we directly depend on for our
livelihood and quality of life, it is essential to conserve native biodiversity at all scales (genes, species,
natural communities, and landscapes) if ecosystems are to continue functioning.
From an ecological perspective, a landscape is “a large area of land that includes a mosaic of natural
community types and a variety of habitats for many species” (Massachusetts Biomap, 2000). A natural
community is “an interacting assemblage of organisms, their physical environment, and the natural
processes that affect them” (Thompson and Sorenson, 2000). Natural communities are usually defined by
their dominant plant species or the geological features on which they depend; Pike County examples include
red spruce palustrine forest, and leatherleaf – bog-rosemary peatland. Each type of natural community
represents habitat for a different group of species, hence identification and stewardship of the full range of
native community types is needed to meet the challenge of conserving habitat for all species. Classifying
these communities gives ecologists, planners, managers, and landowners a common language with which to
discuss land conservation. At the landscape scale, it is important to consider whether communities and
habitats are isolated or connected. It is important to maintain corridors of natural landscape traversable by
wildlife, and to preserve natural areas large enough to support viable populations and ecosystems.
Pennsylvania’s natural heritage is rich in biodiversity and the Commonwealth includes many examples of
high quality natural communities and large expanses of natural landscapes. The extensive tracts of forest
in the northern and central parts of the state represent a large portion of the remaining areas of suitable
Pike County Natural Heritage Inventory – Introduction / 1