The Design of Nature Preserves and other Protected Areas. The Design of Nature Preserves and other Protected Areas. Remember: in our section on fragmentation of habitat there were important size and shape concerns. Six Fundamental Design Features for Preserves.
Remember: in our section on fragmentation of habitat there were important size and shape concerns
1. A large preserve will hold more species than a small preserve.
Remember- species area effect from Chapter 5
A. Larger preserves tend to contain a wider range of environmental conditions
B. Large preserves are more secure than small reserves for 3 reasons
1.) they have relatively larger populations that are less likely to go extinct
2.) they have a relatively shorter edge than small preserves
3.) they are less vulnerable to a catastrophic event
2. A single large preserve is preferable to several small reserves of equal total area.
Blue Poison Frog
68 ha reserves of equal total area.
Original area = 100 ha
Original area = 2 plots
of 50 ha each
Original area= 100 ha
given an edge width of 100 m
3. If it is necessary to have multiple small preserves, they should be as close together as possible.
Remember the concept of a metapopulation from chapter 3
4. Arranging small preserves in a cluster is preferable to a linear fashion
5. Connecting the preserves with corridors will make dispersal easier for many species.
100 ha dispersal easier for many species.
Edge= 3545 m
Total Edge = 5013 m
Edge = 4243 m
6. By making preserves as circular as possible, dispersal within the preserve will be enhanced and the negative effects of edge will be minimized
National Parks- Conserving Wildlife? dispersal easier for many species.
Bryce Canyon National Park
Mammal Extinctions in our National Parks dispersal easier for many species.
Park Name Established Extinct Mammals
Bryce Canyon 1923 White-tail Jack Rabbit
Lassen Volcanic 1907 Nuttal’s Cottontail
Mount Ranier 1899 Gray Wolf