No Yard Is Too Small

Landscape ecology describes how habitat fragmentation can limit biodiversity in several ways.  Small fragments may mean small breeding populations, in turn limiting genetic variety within a species. In small fragments, the relative importance of edge effects is increased, and these effects often include light, noise, or pollutants.

For these reasons, it is surprising how much avian biodiversity can be encouraged on very small patches of land. NPR reporter and bird lover Melissa Block learned this when she invited Bill Thompson, the editor of Bird Watcher’s Digest, to her backyard in Washington, D.C. Although her property measures less than 1/100 of an acre, Thompson helps her to identify ways of attracting a greater variety of birds. His technique relies on a combination of carefully-chosen

As he mentions, outside domestic cats impede efforts to attract birds. On my family’s 0.31 acre in Bridgewater, Massachusetts, our wildlife efforts compete with the well-meaning efforts of a person who maintains feral cats in the adjacent woods. We have overcome the resultant predation (and intimidation) of birds by providing a combination of feed and habitat very similar to what Thompson prescribed.

1. In most parts of the world, the use of metric units means that people can readily make comparisons that are difficult in the United States, where the old English units are still used. For example, 1/100 of a hectare is 100 square meters, whereas 1/100 of an acre is 435.6 square feet. Ten thousand square meters to the hectare and one hundred hectares to the square kilometer; these are quite easy, compared to 43,560 square feet per acre and 640 acres per square mile. For geographers working in the United States, it is worth taking the time to memorize some of the conversions related to area or distance.

2. The National Wildlife Federation offers guidance to people wishing to improve conditions for wildlife on their own property, offering certification for gardens and backyards that provide a combination of water, habitat, and food sources for wildlife. Choose a piece of property — perhaps your own, that of a family member, or part of your school campus. Identify the boundaries of the property and its size, then visit the NWF backyard wildlife page to see whether conditions on the property are favorable for wildlife. Prepare a site map that shows the resources that are present, and write a brief description of how the site compares to the certification standards. If it is suitable for certification — or can be made so — consider applying to NWF for formal certification.