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<p>The species of <i>Saintpaulia</i> and <i>Streptocarpus</i> species are ecologically relevant sciophytes and world-wide ornamentally important indoor plants with centers of diversity in northeastern Tanzania. Many of their species are critically endangered or near-threatened, and little is known about their demography. I examined the distribution and abundance of <i>Saintpaulia</i> and <i>Streptocarpus</i> species in Udzungwa Scarp Nature Reserve, which includes critical habitats for species of these genera. I used a systematic sampling consisting of five belt transects across an altitudinal gradient, each consisting of ten 0.3&#xa0;ha subplots. Individuals of each species of <i>Saintpaulia</i> and <i>Streptocarpus</i> were tallied. <i>Streptocarpus holstii</i> was the most abundant (93%) compared to <i>S</i>. <i>caulescens</i> (7%). The average abundance of <i>Streptocarpus</i> species per ha in USNR was 316.44 ± 4.66 individuals/ha, with over 70% of the <i>Streptocarpus</i> species encountered at a single subplot at 356&#xa0;m in elevation. The <i>Streptocarpus</i> species were sparsely distributed between 353 and 1098&#xa0;m in elevation. <i>Streptocarpus</i> had an aggregated distribution in Udzungwa, and <i>Saintpaulia</i> is uncommon. The results back up conservation priorities and habitat management plans.</p>

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Distribution and abundance of Saintpaulia and Streptocarpus species in Udzungwa mountain forests, Tanzania

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  • 发表日期：

    2025年9月3日

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  • Kajenje Magessa

摘要

The species of Saintpaulia and Streptocarpus species are ecologically relevant sciophytes and world-wide ornamentally important indoor plants with centers of diversity in northeastern Tanzania. Many of their species are critically endangered or near-threatened, and little is known about their demography. I examined the distribution and abundance of Saintpaulia and Streptocarpus species in Udzungwa Scarp Nature Reserve, which includes critical habitats for species of these genera. I used a systematic sampling consisting of five belt transects across an altitudinal gradient, each consisting of ten 0.3 ha subplots. Individuals of each species of Saintpaulia and Streptocarpus were tallied. Streptocarpus holstii was the most abundant (93%) compared to S. caulescens (7%). The average abundance of Streptocarpus species per ha in USNR was 316.44 ± 4.66 individuals/ha, with over 70% of the Streptocarpus species encountered at a single subplot at 356 m in elevation. The Streptocarpus species were sparsely distributed between 353 and 1098 m in elevation. Streptocarpus had an aggregated distribution in Udzungwa, and Saintpaulia is uncommon. The results back up conservation priorities and habitat management plans.