Convergent Coevolution Across Continents: Nectar Composition and Sucrose Digestion Capacity in Birds

2020 ◽  
Author(s):  
Todd Jason McWhorter ◽  
Jonathan A. Rader ◽  
Jorge E. Schondube ◽  
Susan W. Nicolson ◽  
Berry Pinshow ◽  
...  
Keyword(s):  
Nectar Composition

scholarly journals Functional Diversity of Nectary Structure and Nectar Composition in the Genus Fritillaria (Liliaceae)

2018 ◽  
Vol 9 ◽  
Author(s):  
Katarzyna Roguz ◽  
Andrzej Bajguz ◽  
Agnieszka Gołębiewska ◽  
Magdalena Chmur ◽  
Laurence Hill ◽  
...  
Keyword(s):  
Functional Diversity ◽  
Nectary Structure ◽  
Nectar Composition

Pronounced differences in visitation by potential pollinators to co-occurring species of Fabaceae in the Southwest Australian biodiversity hotspot

2020 ◽  
Vol 194 (3) ◽  
pp. 308-325 ◽  
Author(s):  
Daniela Scaccabarozzi ◽  
Kingsley W Dixon ◽  
Sean Tomlinson ◽  
Lynne Milne ◽  
Björn Bohman ◽  
...  
Keyword(s):  
Abundant Species ◽  
Biodiversity Hotspot ◽  
Native Bees ◽  
Nectar Composition ◽  
Species Overlap ◽  
Introduced Honeybee ◽  
Potential Competitor ◽  
Pollination Systems

Abstract Despite their diversity and the potential for specialized pollination systems, Australian Fabaceae have received little attention in pollination studies. In the Southwest Australian Floristic Region (SWAFR), a recognized biodiversity hotspot, co-occurring and abundant species of Faboideae exhibit a range of floral colours and forms, suggestive of adaptation to different groups of pollinators. For four communities of Fabaceae in the SWAFR we investigated whether co-occurring species overlap in pollinator genera, whether these pollinators show differences in behaviour on the pea flower and whether variations in stamen length and nectar composition among species are associated with different pollinator types. Species of Fabaceae were visited by one to four genera of native bees, suggesting varying levels of ecological specialisation. In Fabaceae with more specialized interactions, co-occurring species showed marked differences in the bee genera attracted. Unexpectedly, some Fabaceae frequently attracted beetles, which may play an important role in their pollination. There was no evidence for an association between stamen length or nectar composition and the type of pollinator. The introduced honeybee, visited all studied species of Fabaceae, suggesting that they may act both as a pollinator and a potential competitor with native pollinators.

Onion Hybrid Seed Production: Relation with Nectar Composition and Flower Traits

2018 ◽  
Vol 111 (3) ◽  
pp. 1023-1029 ◽  
Author(s):  
Veronica C Soto ◽  
Cristian A Caselles ◽  
Maria F Silva ◽  
Claudio R Galmarini
Keyword(s):  
Seed Production ◽  
Hybrid Seed ◽  
Hybrid Seed Production ◽  
Nectar Composition ◽  
Production Relation ◽  
Flower Traits

Nectar composition in 'Újfehértói fürtös' and 'Pándy 48' sour cherry cultivars

2006 ◽  
Vol 48 (3-4) ◽  
pp. 271-277 ◽  
Author(s):  
P. Bukovics ◽  
L. Gy. Szabó ◽  
Zs. Orosz-Kovács ◽  
Á. Farkas
Keyword(s):  
Sour Cherry ◽  
Nectar Composition

Transient starch metabolism in ornamental tobacco floral nectaries regulates nectar composition and release

Plant Science ◽  
2007 ◽  
Vol 173 (3) ◽  
pp. 277-290 ◽  
Author(s):  
Gang Ren ◽  
Rosanne A. Healy ◽  
Anna M. Klyne ◽  
Harry T. Horner ◽  
Martha G. James ◽  
...  
Keyword(s):  
Starch Metabolism ◽  
Nectar Composition ◽  
Floral Nectaries

Floral nectary structure and nectar chemical composition of some species from Robinson Crusoe Island (Chile)

2000 ◽  
Vol 78 (7) ◽  
pp. 862-871 ◽  
Author(s):  
Gabriel Bernardello ◽  
Leonardo Galetto ◽  
Gregory J Anderson
Keyword(s):  
Statistical Tests ◽  
General Pattern ◽  
Wind Pollination ◽  
Robinson Crusoe ◽  
Floral Nectary ◽  
Nectary Structure ◽  
Nectar Composition ◽  
Hummingbird Pollination ◽  
Self Compatibility ◽  
Juan Fernández Archipelago

Floral nectary structure and nectar composition of 12 species, including 11 endemics, are reported from Robinson Crusoe Island (Juan Fernández Archipelago, Chile). These species are mostly hummingbird pollinated. Nectary morphology follows the general pattern within each of the families, suggesting it is an ancestral feature. The mean nectar concentration (± SD) as a percentage of weight (weight/total weight of solution) was 28.3 ± 20.7. Sucrose, fructose, and glucose were identified in most samples. In Nicotiana cordifolia, an unknown monosaccharide was also detected. When more than one sample per species was examined, there was usually variability in sugar ratios. Statistical tests indicated that population size does not influence this variability. However, there were differences when the pollinator type was compared, with a trend of a higher sucrose proportion and a lower coefficient of variation of sucrose in the species pollinated by hummingbirds. This would indicate a specialization in the nectar composition of the hummingbird-pollinated species. Cuminia eriantha, N. cordifolia, and Rhaphithamnus venustus also possess amino acids in their nectar. In the non-hummingbird-pollinated species, the presence of nectaries and nectar serves as an indication of the ancestral pollination system of the first colonizers rather than the current condition, which is wind pollination or self-compatibility for most of the species. Thus, the presence of nectar in flowers does not necessarily indicate extant biotic pollination.Key words: angiosperms, Robinson Crusoe Island, nectary structure, nectar sugar composition, sugar concentration, hummingbird pollination.

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