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Pollinator surveys of two populations located in the North and South of Mallorca (Balearic Islands, Spain) in 2021 from May to July focused on Eryngium maritimum pollinators

Citation

Cortes, Ivan (2022), Pollinator surveys of two populations located in the North and South of Mallorca (Balearic Islands, Spain) in 2021 from May to July focused on Eryngium maritimum pollinators, Dryad, Dataset, https://doi.org/10.5061/dryad.p8cz8w9s8

Abstract

The aim of this study is to analyse the role played by E. maritimum in the dune pollination network of the Balearic Islands, where there is an intense anthropogenic impact in its habitat. For this purpose, two populations located in the North and South of Mallorca were chosen, in which diurnal transects were carried out to observe and capture pollinators on 15 plant species during the anthesis period of E. maritimum. The flowering period of 10 plant species flowering at the same period than E. maritimum was analysed to identify periods of competition

First sampling area was located in Son Serra de Marina (SS, 39.7309N, 3.2382E), in the North of the island.  We carried out three 50m linear transects along the seashore. Transects were randomly located at a minimum of 100 m from each other in order to enhance the chances of a fair sampling of most of the flora. In both areas, vegetation, and so transects, followed a clear sequence from the seashore inland. Areas were sampled for 10 weeks, from the beginning of E. maritimum flowering in the first week of June until the second week of July, plus two weeks extra (one after and one before) in order two observe pollinator diversity variation. Surveys took place between 08:00–18:00h under favourable weather conditions. A pollinator survey involved an observer slowly walking (40 min) along a transect and recording only those insects that contacted the plant's reproductive structures while actively searching for pollen and/or nectar. 

The dataset indicates each observation in a single row. Population, hour, transect, pollinator and plant taxonomical information, if the pollinator was captured, photographed or if it visited multiple species is indicated.