Evol Ecol Res 14: 425-445 (2012) Full PDF if your library subscribes.
Post-zygotic reproductive isolation among populations of Iris atropurpurea: the effect of spatial distance among crosses and the role of inbreeding and outbreeding depression in determining niche width
Yuval Sapir1 and Rupert Mazzucco2
1The Botanical Garden, Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Tel Aviv, Israel and 2Evolution and Ecology Program, Institute for Applied Systems Analysis, Laxenburg, Austria
Correspondence: Y. Sapir, The Botanical Garden, Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel.
Question: What is the role of inbreeding and outbreeding depression in creating spatial patterns of reproductive isolation among populations within a species?
Hypothesis: A combination of inbreeding and outbreeding effects create an optimal crossing distance at which reproductive isolation is minimal.
Organism: Iris atropurpurea Dinsm., an endangered and endemic Israeli plant, with a fragmented distribution throughout the coastal plain.
Field sites: Two I. atropurpurea populations, one in the Shafdan dunes and one in the Netanya Iris Reserve, about 19 km south and north of Tel Aviv respectively, on the coastal plain in Israel.
Methods: We performed artificial cross-pollination within and between populations of I. atropurpurea at various distances and measured seed germination and seedling survivorship.
Results: Theoretical considerations led us to expect that inbreeding depression acts mostly at the small scale, and that higher offspring fitness is revealed at distances <10 km. Results of the experiment show that reproductive isolation acts differently in consequent stages of the hybrid life history. The pattern of total reproductive isolation among populations along a geographical axis showed different patterns in the two natural populations; whereas in the Netanya population no pattern appeared, in Shafdan we found a pattern of intermediate distance where reproductive isolation is the highest, and at short and long distances reproductive isolation is relaxed.
Keywords: conservation, habitat fragmentation, Iris section Oncocyclus, optimal crossing distance, spatial genetic model, speciation.
DOWNLOAD A FREE, FULL PDF COPY
IF you are connected using the IP of a subscribing institution (library, laboratory, etc.)
or through its VPN.
© 2012 Yuval Sapir. All EER articles are copyrighted by their authors. All authors endorse, permit and license Evolutionary Ecology Ltd. to grant its subscribing institutions/libraries the copying privileges specified below without additional consideration or payment to them or to Evolutionary Ecology, Ltd. These endorsements, in writing, are on file in the office of Evolutionary Ecology, Ltd. Consult authors for permission to use any portion of their work in derivative works, compilations or to distribute their work in any commercial manner.
Subscribing institutions/libraries may grant individuals the privilege of making a single copy of an EER article for non-commercial educational or non-commercial research purposes. Subscribing institutions/libraries may also use articles for non-commercial educational purposes by making any number of copies for course packs or course reserve collections. Subscribing institutions/libraries may also loan single copies of articles to non-commercial libraries for educational purposes.
All copies of abstracts and articles must preserve their copyright notice without modification.