Spatiotemporal variation in the endangered Thymus decussatus in a hyper-arid environment

Thompson, Katy; Gilbert, Francis

Abstract

Aims: Arid environments are resource limited, with scarcity of water the key limiting factor, but hyper-arid environments are rarely studied. We test for spatial and temporal variation in ecologically important characteristics to deduce plant adaptations to the extreme climate.
Methods: The endangered Sinai Thyme (Thymus decussatus) exists as a set of patches on mountaintops within the St Katherine Protectorate, South Sinai, a hyper-arid environment with rare events of good rains (every 10–15 years).
Important Findings: From spatial and temporal patterns of plant mortality, size, condition and flowering among 10 patches on the Mt Sinai massif, we deduce that the incidence and amount of flowering responds relatively quickly (1–2 years) to rainfall fluctuations, but plant growth respond only very slowly. Small individuals are most at risk of death during drought, and a high proportion of plants were dead at the end of 8 years of very low or no rainfall. No recruitment of seedlings was observed even in years of good rainfall. Droughts are expected to become increasingly frequent due to climate change; this may have important consequences for Sinai Thyme and also its associated herbivores, such as the Critically Endangered Sinai Baton Blue (Pseudophilotes sinaicus) whose larval stage feeds exclusively upon the flowers of this plant.

Citation

Thompson, K., & Gilbert, F. (2015). Spatiotemporal variation in the endangered Thymus decussatus in a hyper-arid environment. Journal of Plant Ecology, 8(1), https://doi.org/10.1093/jpe/rtu004

• Journal Article Type: Article
• Acceptance Date: Apr 29, 2014
• Online Publication Date: Jun 5, 2014
• Publication Date: Feb 1, 2015
• Deposit Date: Jun 29, 2016
• Publicly Available Date: Jun 29, 2016
• Journal: Journal of Plant Ecology
• Print ISSN: 1752-9921
• Electronic ISSN: 1752-993X
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 8
• Issue: 1
• DOI: https://doi.org/10.1093/jpe/rtu004
• Keywords: Spatial variation ; temporal fluctuations ; resource availability ; drought ; Egypt
• Public URL: https://nottingham-repository.worktribe.com/output/741959
• Publisher URL: http://jpe.oxfordjournals.org/content/8/1/79
• Additional Information: This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of Plant Ecology following peer review. The version of record Thompson, Katy and Gilbert, Francis (2015) Spatiotemporal variation in the endangered Thymus decussatus in a hyper-arid environment. Journal of Plant Ecology, 8 (1). pp. 79-90. is available online at: http://jpe.oxfordjournals.org/content/8/1/79