|Checklist of the Collembola: Note on the seasonal occurence of Sminthurus hispanicus Nayrolles 1995 (Sminthuridae) from Ibiza, Spain|
Department of Biology, University of Antwerp, Antwerp, B-2020, Belgium
Ronald Beer, ... Ibiza, Spain
Based on observations ranging from 2009 to 2016,
it is conclusive that Sminthurus hispanicus Nayrolles 1995
in Sant Jordi de Ses Salines, Balearic Islands, Spain
is active mainly in the wet season from October to February.
Surface active specimens of Sminthurus hispanicus were photographed on daily basis. The data collected from 2009-2012 is incomplete. Since 2013 to 2016, data was collected in a more systematic matter.
Effect of temperature on seasonal occurence.
Effect of moisture conditions on seasonal occurence.
There is a distinct correlation between the presence of active stages and the precipitation, the relative humidity and the number of wet days (Fig.Ib). Active specimens are absent from May to July (Table.1). This period coincides with a period with a precipitation of less than 24mm (=24 ltr/m2), a relative humidity of less than 61%, and a number of wet days/month of less than 4.
Active specimens are always present from October to February (Table.1), in which the precipitation is at least 27mm, the relative humidity is more than 63%, and the number of wet days is at least 6.
From september to december 2016 almost only juveniles were observed.
In december 2016 a lot of rain, the white flowers have been smothered and it is hard to find Collembola.
Effect of various other environmental factors on seasonal occurence.
Availibility of food, the soil texture (its water-holding capacity),
the soil reaction.
Correlation with presence of ???little white flowers??? as pollen food source.
The occurence of different generations.