Fitness of invasive Carpobrotus (Aizoaceae) hybrids in coastal California

被引:34
作者
Vila, M [1 ]
D'Antonio, CM [1 ]
机构
[1] Univ Calif Berkeley, Dept Integrat Biol, Berkeley, CA 94720 USA
来源
ECOSCIENCE | 1998年 / 5卷 / 02期
关键词
allopatric species; Carpobrotus; hybrid fitness; interspecific hybridization; plant invasion;
D O I
10.1080/11956860.1998.11682460
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Natural hybridization between previously allopatric plant species can produce highly successful lineages. We test the low-fitness-hybrid hypothesis in Carpobrotus and its implications for hybrid invasion. We examine reproductive fitness components of hybrids between the invasive non-native succulent Carpobrotus edulis (L. Bolus) and the non-invasive putative native C. chilensis (L.) from three populations in California coastal plant communities. Hybrids between the two species are very abundant and aggressive but it is not known if this is a transitory phenomenon. We find no support for the low-fitness-hybrid hypothesis in Carpobrotus. Fruit weight and seed set, mass and germination rate of hybrids were intermediate between or the same as a parental taxon. Survival, growth, and root to shoot ratio of hybrid seedlings did not differ from those of parental taxa. Although hybrid fitness is nor superior to that of parental species, we believe that hybrids will continue to persist and invade California coastal communities because recruitment of seedlings did not differ from those of parental species. The highest survival probability of the introduced C. edulis may insure its successful invasion status compared to the putative native congener C. chilensis.
引用
收藏
页码:191 / 199
页数:9
相关论文
共 47 条
[1]  
*AB CONC INC, 1989, US GUID MAC
[2]  
*AB CONC INC, 1992, US GUID MAC
[3]   HYBRIDIZATION BETWEEN JUNIPERUS-ERYTHROCARPA CORY AND JUNIPERUS-PINCHOTII SUDWORTH IN THE CHISOS MOUNTAINS, TEXAS [J].
ADAMS, RP ;
KISTLER, JR .
SOUTHWESTERN NATURALIST, 1991, 36 (03) :295-301
[4]  
Albert M. E., 1995, THESIS U CALIFORNIA
[5]   Hybridization and introgression in Carpobrotus spp. (Aizoaceae) in California .1. Morphological evidence [J].
Albert, ME ;
DAntonio, CM ;
Schierenbeck, KA .
AMERICAN JOURNAL OF BOTANY, 1997, 84 (07) :896-904
[6]  
[Anonymous], 1978, Madrono
[7]   ARE NATURAL HYBRIDS FIT OR UNFIT RELATIVE TO THEIR PARENTS [J].
ARNOLD, ML ;
HODGES, SA .
TRENDS IN ECOLOGY & EVOLUTION, 1995, 10 (02) :67-71
[8]   ANALYSIS OF HYBRID ZONES [J].
BARTON, NH ;
HEWITT, GM .
ANNUAL REVIEW OF ECOLOGY AND SYSTEMATICS, 1985, 16 :113-148
[9]   SHADE TOLERANCE AND ITS EFFECT ON THE SEGREGATION OF 2 SPECIES OF LOUISIANA IRIS AND THEIR HYBRIDS [J].
BENNETT, BD ;
GRACE, JB .
AMERICAN JOURNAL OF BOTANY, 1990, 77 (01) :100-107
[10]   CHANGES IN FECUNDITY DO NOT PREDICT INVASIVENESS - A MODEL STUDY OF TRANSGENIC PLANTS [J].
BERGELSON, J .
ECOLOGY, 1994, 75 (01) :249-252