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Abstract Detail


Recent Topics Posters

Bell, Hester [1].

Sympatry of three species of the dioecious and halophytic grass genus, Distichlis (Poaceae, Chloridoideae), in Baja California, Mexico.

Stephenson postulated hybrid origin for a specimen from El Nuevo Rosarito, Baja California with the putative parents being Distichlis spicata(L.) Greene and D.littoralis (Engelm.) H.L. Bell & Columbus (= Monanthochlo√ę littoralis Engelm.). Recent anatomical, morphological, and molecular work has established that the putative hybrid is a new species, Distichlis bajaensis H.L. Bell, and may be sister to the other ten species in the genus. A second, large population of this new species has been located at Laguna Mormona near San Quint√≠n, Baja California. Distichlis bajaensis is the dominant grass species at both known locations. Near El Nuevo Rosarito it is found growing with D. spicata; at Laguna Mormona, D. bajaensis, D. littoralis, and D. spicata occur sympatrically. Despite growing in close proximity, phylogenetic inference using molecular data provides no evidence of gene flow between species. Sex ratios in Distichlis populations are frequently highly skewed and may explain the lack of gene flow and maintenance of three distinct species.

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1 - Rancho Santa Ana Botanic Garden, 1500 N. College Ave., Claremont, CA, 91711, USA

Keywords:
Distichlis
Poaceae
sympatry
sex ratios
gene flow
dioecy
halophyte.

Presentation Type: Recent Topics Poster
Session: P
Location: Khorassan Ballroom/Chase Park Plaza
Date: Monday, July 11th, 2011
Time: 5:30 PM
Number: PRT018
Abstract ID:1082


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