Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.2307/2445955 |
Reproductive ecology and inbreeding depression in Opuntia rastrera (Cactaceae) in the Chihuahuan Desert: Why are sexually derived recruitments so rare? | |
Mandujano, MDC; Montana, C; Eguiarte, LE | |
通讯作者 | Mandujano, MDC |
来源期刊 | AMERICAN JOURNAL OF BOTANY |
ISSN | 0002-9122 |
出版年 | 1996 |
卷号 | 83期号:1页码:63-70 |
英文摘要 | We evaluated the influence of the reproductive ecology on low recruitment of sexually derived progeny observed in Opuntia rastrera Weber in the Southern Chihuahuan Desert, in two vegetation types. The flowers are diurnal, remaining open 9-10 hr. Pollen is released in the morning and at the same time the stigmas become receptive. Nectar is produced all day, but the production rate is higher at noon. The flowers are visited by insects, mainly solitary bees (Diadasia sp. and Lithurge sp.). Floral characteristics and the pollen/ovule ratio suggest that Opuntia rastrera is a facultative xenogamous species. Controlled pollinations indicate that it is not apomictic and pollinators are required to set fruit; it is also self-compatible, but there is strong inbreeding depression for fruit set. However, we were unable to demonstrate differences in reproductive characters between the populations in both vegetation types. The average density of adults per hectare was one order of magnitude higher in the nopalera (Opuntia-dominated scrublands) than in the grassland. However, the average density of plants that originated from seeds was one order of magnitude lower in the nopalera. Opuntia rastrera produces abundant flowers, fruits, and seeds in both vegetation types in natural conditions. The low success in the recruitment of new genets cannot be ascribed to the reproductive ecology. |
英文关键词 | Cactaceae Chihuahuan Desert grassland inbreeding depression nopalera Opuntia rastrera recruitment reproductive ecology |
类型 | Article |
语种 | 英语 |
国家 | MEXICO |
收录类别 | SCI-E |
WOS记录号 | WOS:A1996TQ26600009 |
WOS关键词 | SONORAN DESERT ; NURSE PLANTS ; SELF-FERTILIZATION ; POLLINATION ; CACTI ; ASSOCIATION ; AGAVACEAE ; EVOLUTION ; BIOLOGY ; FLOWERS |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
来源机构 | Universidad Nacional Autónoma de México |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/132231 |
作者单位 | (1)INST ECOL,XALAPA 910000,VERACRUZ,MEXICO |
推荐引用方式 GB/T 7714 | Mandujano, MDC,Montana, C,Eguiarte, LE. Reproductive ecology and inbreeding depression in Opuntia rastrera (Cactaceae) in the Chihuahuan Desert: Why are sexually derived recruitments so rare?[J]. Universidad Nacional Autónoma de México,1996,83(1):63-70. |
APA | Mandujano, MDC,Montana, C,&Eguiarte, LE.(1996).Reproductive ecology and inbreeding depression in Opuntia rastrera (Cactaceae) in the Chihuahuan Desert: Why are sexually derived recruitments so rare?.AMERICAN JOURNAL OF BOTANY,83(1),63-70. |
MLA | Mandujano, MDC,et al."Reproductive ecology and inbreeding depression in Opuntia rastrera (Cactaceae) in the Chihuahuan Desert: Why are sexually derived recruitments so rare?".AMERICAN JOURNAL OF BOTANY 83.1(1996):63-70. |
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