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Battle of the Sexes: Assessing Sex-Specific Microhabitat Associations in the Mojave Desert Moss Syntrichia caninervis (Pottiaceae)
Başlık:
Battle of the Sexes: Assessing Sex-Specific Microhabitat Associations in the Mojave Desert Moss Syntrichia caninervis (Pottiaceae)
Yazar:
Garcia, Alexandra Nicole, author.
ISBN:
9780438070493
Yazar Ek Girişi:
Fiziksel Tanımlama:
1 electronic resource (40 pages)
Genel Not:
Source: Masters Abstracts International, Volume: 57-06M(E).
Advisors: Kirsten M. Fisher Committee members: Paul J. Narguizian; Robert Nissen; Eric M. Wood.
Özet:
Both a heavy reliance on asexual reproduction and the evolution of desiccation tolerance have allowed mosses to successfully inhabit arid environments worldwide. The species Syntrichia caninervis (Pottiaceae) is particularly successful in colonizing these environments. Studies on S. caninervis in the Mojave Desert, CA have observed a high female bias based upon phenotypic sex expression, and have suggested that male mosses may be restricted to shaded and moist microhabitats, because the rare expression of male gametangia is limited to these microsites. But sex expression is not necessarily a proxy for the distribution of sexes, as most ramets in a given population of S. caninervis do not express sex and could represent either males or females. Here, I use a novel genetic sex marker to test for the presence of sex-specific differences in microsite use in S. caninervis across 18 microhabitat variables in the Mojave Desert. Sex of 91 sterile samples was determined through PCR followed by restriction enzyme digestion and visualization of the digested products. Statistical analyses applied to the microhabitat data inferred the absence of sex-specific differences in microhabitat associations. The results challenge current assumptions indicating that males and females are not microhabitat specific, as sex expression suggests. These findings have important implications for resolving the ecological and evolutionary drivers of sex ratio bias in S. caninervis, providing context for understanding sex evolution in other types of plants.
Notlar:
School code: 0962
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Yer Numarası | Demirbaş Numarası | Shelf Location | Lokasyon / Statüsü / İade Tarihi |
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XX(692747.1) | 692747-1001 | Proquest E-Tez Koleksiyonu | Arıyor... |
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