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

Sapir Y & Mazzucco R (2012). 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. Evolutionary Ecology Research 14 (4): 425-445.

Full text not available from this repository.

Abstract

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. he 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.

Item Type: Article
Uncontrolled Keywords: Conservation; Habitat fragmentation; Iris section Oncocyclus; Optimal crossing distance; Spatial genetic model; Speciation
Research Programs: Evolution and Ecology (EEP)
Depositing User: IIASA Import
Date Deposited: 15 Jan 2016 08:46
Last Modified: 04 Apr 2016 13:58
URI: http://pure.iiasa.ac.at/9880

Actions (login required)

View Item View Item

International Institute for Applied Systems Analysis (IIASA)
Schlossplatz 1, A-2361 Laxenburg, Austria
Phone: (+43 2236) 807 0 Fax:(+43 2236) 71 313