Invertebrates of Organ Pipe Cactus National Moument

Kingsley, Kenneth

A general study of the invertebrates of Organ Pipe Cactus National Monument was conducted between October 1987 and September 1990. This period was marked by drought and higher than normal temperatures. The most important factor influencing invertebrate populations appears to be weather. The effects of weather were apparently so profound as to override any other factors and limit conclusions that could be drawn from the data. This precluded derivation of conclusions about the importance of other population regulating factors and complicates development of a meaningful long-term monitoring plan. This study examined the distribution and ecology of invertebrates in the monument and was part of a larger, multidisciplinary research program, the Sensitive Ecosystems Program (SENECPRO). The study focused primarily on 16 designated SENECPRO research sites. Macroinvertebrates, primarily arthropods, were collected and observed over a period of 3 years. Over 5,000 records and 4,200 specimens were made. More than 1,000 taxa were recorded. Most taxa were rare, with 439 being recorded only once. Only 50 taxa were recorded more than 10 times. Specific objectives of this study were to determine important species, indicator species, and invading exotic species; supplement the monument's invertebrate collection; and provide a methodology for long-term monitoring. Lists of important, indicator, and invading species were made. The only significant problem involving invertebrates is the impending arrival of the strain of honey bee (Apis mellifera) known as the "Africanized" bee. This strain is expected to have important but unpredictable impacts on visitor safety, resource management, and aspects of plant and animal ecology. Methodology for long-term monitoring is presented in a separate document. Potential problems for implementing this methodology are discussed in this report.

Invertebrates of Organ Pipe Cactus National Moument

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