Pollination biology of Grindelia covasii (Asteraceae), a potential crop for arid lands

Roitman, Germán

doi:10.1006/jare.1999.0531

Cited by 7 publications

(1 citation statement)

References 22 publications

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“…Our observations show that I. racemosa is protandrous and the pollen is shed from the anthers onto the sweeping hairs of the style in the bud stage when the style branches are joined and stigmatic surfaces are not receptive. This is consistent with the observations on some other species of Asteraceae (Roitman 1999;Carana 2004). As the style grows out of the anther tube, the outside of the style branches presents pollen for pollination.…”

Section: Discussionsupporting

confidence: 93%

Floral phenology, secondary pollen presentation and pollination mechanism in Inula racemosa (Angiosperms: Asteraceae)

Shabir¹,

Nawchoo²,

Wani³

2013

J. Threat. Taxa

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Inula racemosa Hook. f. is protandrous, discharges pollen grains inside the anther tube and presents pollen secondarily onto the sweeping hairs of the style. The style and stigmatic branches present the yellow clumped pollen grains for pollination. This study describes floral functional morphology and phenology, anther dehiscence and pollen presentation, growth and behaviour of style during anthesis and pollination mechanism of I. racemosa. The species is entomophilous and is characterized by a highly asynchronous sexual phase. A large degree of asynchrony from floret to floret in a capitulum, and capitulum to capitulum in a plant, keeps the pollen dispersed for a longer duration. Two insect families were represented in the pollinator survey: Hymenoptera and Diptera. A significant correlation was observed between the number of capitula visited per bout and foraging time. We discuss morphological features of the flowers which may enhance the pollen removal rate per bee visit and consequently cause a high visitation and pollination rate.

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Section: Discussionsupporting

confidence: 93%

Floral phenology, secondary pollen presentation and pollination mechanism in Inula racemosa (Angiosperms: Asteraceae)

Shabir¹,

Nawchoo²,

Wani³

2013

J. Threat. Taxa

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Can Invasive Species Facilitate Native Species? Evidence of How, When, and Why These Impacts Occur

2006

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Although the predatory and competitive impacts of biological invasions are well documented, facilitation of native species by non-indigenous species is frequently overlooked. A search through recent ecological literature found that facilitative interactions between invasive and native species occur in a wide range of habitats, can have cascading effects across trophic levels, can re-structure communities, and can lead to evolutionary changes. These are critical findings that, until now, have been mostly absent from analyses of ecological impacts of biological invasions. Here I present evidence for several mechanisms that exemplify how exotic species can facilitate native species. These mechanisms include habitat modification, trophic subsidy, pollination, competitive release, and predatory release. Habitat modification is the most frequently documented mechanism, reflecting the drastic changes generated by the invasion of functionally novel habitat engineers. Further, I predict that facilitative impacts on native species will be most likely when invasive species provide a limiting resource, increase habitat complexity, functionally replace a native species, or ameliorate predation or competition. Finally, three types of facilitation (novel, substitutive, and indirect) define why exotic species can lead to facilitation of native species. It is evident that understanding biological invasions at the community and ecosystem levels will be more accurate if we integrate facilitative interactions into future ecological research. Since facilitative impacts of biological invasions can occur with native endangered species, and can have wide-ranging impacts, these results also have important implications for management, eradication, and restoration.

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The value of structuring rarity: the seven types and links to reproductive ecology

Espeland

Emam

2011

Biodivers Conserv

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Since 1981, 365 papers have cited a rarity matrix organized along three axes: geographic range (GR) (large vs. small), habitat specificity (HS) (specialist vs. generalist), and local abundance (LA) (dense vs. sparse). In the wider ecology literature, research on the association between plant species distributions and life history traits has mainly focused on a single axis such as GR. However, the internal structure of species ranges is widely recognized as important. In order to determine if identifying different types of rarity leads to alternative conclusions regarding the causes and consequences of rarity, we created a dataset linking the seven types of rarity matrix and to reproductive ecology traits. We found associations between the axes and these traits in a dataset of 101 rare plant species culled from 27 papers. Significant traits included mating system and seed dispersal mechanism. Species with small GR are more likely to have ballistic or wind dispersal than biotically-mediated dispersal (abiotic:biotic ratio 3:1). Habitat specialist species with small GRs are more likely to have outcrossing mating systems compared to habitat specialists of large GR (16:1). These results show that, within rare species, the structure of rarity is important (e.g. habitat specialization is different from small GR) and should be identified when determining basic mechanisms of plant distribution and abundance.

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Pollination biology of Grindelia covasii (Asteraceae), a potential crop for arid lands

Cited by 7 publications

References 22 publications

Floral phenology, secondary pollen presentation and pollination mechanism in Inula racemosa (Angiosperms: Asteraceae)

Floral phenology, secondary pollen presentation and pollination mechanism in Inula racemosa (Angiosperms: Asteraceae)

Can Invasive Species Facilitate Native Species? Evidence of How, When, and Why These Impacts Occur

The value of structuring rarity: the seven types and links to reproductive ecology

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