Abstract
Two-stage adaptive cluster sampling and two-stage conventional sampling designs were used to estimate population total of Fringe-Eared Oryx that are clustered and sparsely distributed. The study region was Amboseli-West Kilimanjaro and Magadi-Natron cross boarder landscape between Kenya and Tanzania. The study region was partitioned into different primary sampling units with different secondary sampling units that were of different sizes. Results show that two-stage adaptive cluster sampling design is efficient compared to simple random sampling and the conventional two- stage sampling design. The design is less variable compared to the conventional two-stage sampling design.
Highlights
The Fringe-eared Oryx is one of the subspecies of Oryx gazelle
Results show that two-stage adaptive cluster sampling design is efficient compared to simple random sampling and the conventional twostage sampling design
primary sampling units (PSUs) [12] described two-stage adaptive cluster sampling (TSA) which is a combination of Adaptive cluster sampling (ACS) and TS sampling designs
Summary
The Fringe-eared Oryx is one of the subspecies of Oryx gazelle. They range from the grassland of Northern Eastern Tanzania to Southern Kenya [1] and they are conservation dependent species. The Fringe-Eared Oryx lives in clustered herds that vary in sizes from a few to hundreds of individuals [2] and are sparsely distributed [4]. They are mobile and can travel for long distances in search for food [1] since rainfall within Amboseli ecosystem is unevenly distributed [3]. PSUs [12] described two-stage adaptive cluster sampling (TSA) which is a combination of ACS and TS sampling designs. We evaluate the efficiency of TS and TSA sampling designs in estimating population total of FringeEared Oryx in Amboseli-West Kilimanjaro and MagadiNatron cross border landscape using data from aerial survey conducted in 2010 by KWS and other partners. Section two briefly describes the theory of TSA design, section three gives the method for the current study, section four gives results, and section five has the discussion and conclusion
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