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Francisco-Ortega et al. provide a comprehensive review of the plant genetic diversity literature of the Canary Islands. They put the Canary Islands with their high endemism, close mainland proximity, and high adaptive radiation into context with other islands. Their review discusses conservation planning and management of the rare and endangered insular flora. (see p. 909)

Nectar robbers as pollinators

Navarro's work on Anthyllis vulneraria and Bombus robbers adds to the growing number of recent studies concerning the importance of nectar robbers to plant reproduction. During the 5-yr study Navarro used observational techniques to quantify visitation rates and durations by legitimate and nectar-robber visitors. Robbed flowers had higher fruit set probability than unrobbed flowers and Navarro identified variable conditions that affected the significance of nectar robbing among years. (see p. 980)

Hybrid zone evolution

Fritsche and Kaltz report on the results of an interesting experiment designed to elucidate the factors responsible for the structure of a hybrid zone between two clonal grassland perennials, Prunella grandiflora and P. vulgaris (Lamiaceae). Models of the hybrid zone evolution have made different assumptions about the effect of the environment on parental and hybrid fitness, yet there have been very few estimates of natural fitness components for natural plant hybrid zones. Their results suggest that hybrids cannot spread out of the zone because their fitness is stable only in the midpoint of the gradient between two environmental extremes. (see p. 995)

Root hairs and phosphorus acquisition

In two companion papers Bates and Lynch conduct a thorough study that significantly adds to our understanding of root hair involvement in phosphorus nutrition. Using wild-type Arabidopsis and Arabidopsis mutants with altered root hair development in low-phosphorus and control conditions, they clearly establish that the greater surface area afforded by root hair growth helps plants absorb phosphorus, often one of the least mobile and less accessible minerals in soil.(see p. 958 and 964 )

This Article Submit a response Alert me when this article is cited Alert me when eLetters are posted Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Search for Related Content