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Effects of plant community composition and flowering phenology on honeybee foraging in Mediterranean sylvo-pastoral systems

Bagella, Simonetta and Satta, Alberto and Floris, Ignazio and Caria, Maria Carmela and Rossetti, Ivo and Podani, János (2013) Effects of plant community composition and flowering phenology on honeybee foraging in Mediterranean sylvo-pastoral systems. Applied Vegetation Science, Vol. 16 (4), p. 689-697. eISSN 1402-2001. Article.

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DOI: 10.1111/avsc.12023

Abstract

Questions: Which are the most effective plant communities for honeybee foraging and honey production in Mediterranean sylvo-pastoral systems? What is the relationship between flowering phenology and pollen occurring in honey sediments?
Location: Mediterranean sylvo-pastoral system in Gallura, Sardinia, Italy.
Methods: Phytosociological and phenological surveys were performed in a circular area of 1.5 km radius with a small apiary placed in the centre. Polleniferous and nectariferous values of plant communities were assessed based on the cover and the polleniferous and nectariferous value of each constituting species. Honey production was quantified during the main flow (March–June) and subjected to melissopalynological analysis. Data were evaluated by ordination through principal components analysis and principal coordinates analysis. The latter utilized a new index, developed for calculating the phenological distances based on the individual distributions of flowering frequencies.
Results: Plant communities richest in species providing pollen and nectar were Rhamnus hedges. There was a close correlation between polleniferous and nectariferous values, suggesting that plant communities are important for honeybee foraging of both resources. The temporal flowering sequence ensured the supply of nectar and pollen throughout the spring season. Pollen foraged from 12 Trifolium species with different flowering phenology was the most abundant. Salix purpurea and Rhamnus alaternus were productive at the beginning of the season, followed by Lavandula stoechas, Echium plantagineum and E. italicum.
Conclusions: Plant communities vary in importance for honeybee foraging mainly due to differences in floristic composition and flowering phenology. Communities characterized by human presence (e.g. semi-natural grasslands and hedges) are the most relevant. Some target species (e.g. Trifolium spp.) favoured by grazing livestock ensure foraging for honeybees throughout the season. Plant communities of wild areas, such as the garrigue vegetation, provide foraging for unifloral valuable honey (i.e. ‘Lavandula’ honey).

Item Type:Article
ID Code:8541
Status:Published
Refereed:Yes
Uncontrolled Keywords:Apiculture, Apis mellifera, ecosystem services, flowering phenological distances, Mediterranean landscapes, melissopalynology, pollen spectra
Subjects:Area 05 - Scienze biologiche > BIO/03 Botanica ambientale e applicata
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Scienze della Natura e del Territorio
Publisher:Blackwell / Wiley
eISSN:1402-2001
Copyright Holders:© 2013 International Association for Vegetation Science
Deposited On:23 Jan 2013 12:16

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