Tim Termaat

State Forestry Service / Staatsbosbeheer · PE Gelderland

Many dragonfly species in The Netherlands declined in the 20th century because of acidification, eutrophication, and desiccation of lotic and lentic habitats and canalization of streams and rivers. These pressures peaked in the 1970s, when 26 of 65 native species had an unfavorable conservation status on the 1997 Dutch Red List. Since the 1980s, en...

Many publications documenting large‐scale trends in the distribution of species make use of opportunistic citizen data, that is, observations of species collected without standardized field protocol and without explicit sampling design. It is a challenge to achieve reliable estimates of distribution trends from them, because opportunistic citizen s...

There is limited information available on changes in biodiversity at the European scale, because there is a lack of data from standardised monitoring for most species groups. However, a great number of observations made without a standardised field protocol is available in many countries for many species. Such opportunistic data offer an alternativ...

Monitoring biodiversity is necessary but difficult to achieve in practice, in part because standardized field work is often demanding for volunteer field workers. Collecting opportunistic data on presence and absence of species is much less demanding, but such data may suffer from a number of biases, such as variation in observation effort over tim...

Aim Poleward range shifts of species are among the most obvious effects of climate change on biodiversity. As a consequence of these range shifts, species communities are predicted to become increasingly composed of warm‐dwelling species, but this has only been studied for a limited number of taxa, mainly birds, butterflies and plants. As species g...

Based on a distribution database brought together for the recently published Atlas of the European dragonflies and damselflies, we describe the patterns of diversity and endemism of these insect groups. Highest species richness, as well as richness of predominantly lentic species, occurs in central and western-central Europe. Strictly lotic species...

Dragonflies (Odonata) records gained from various field trips in Andalusia during the summer 2014 are presented. RESUMEN Se presentan las citas de libélulas (Odonata) recolectadas en ocasión de varios viajes a Andalucía durante el verano 2014.

Indices and trends of Dutch butterflies and dragonflies until 2013.

Hoe werkt het? De eDNA-methode is gebaseerd op het feit dat alle in het water levende organismen DNA achterlaten. Dit DNA kan in watermonsters worden aangetoond met behulp van zogenaamde soortspecifieke primers, die voor iedere doelsoort apart ontwikkeld moeten wor-den. Dit zijn korte stukjes DNA die enkel hechten aan het DNA van de doelsoort. Verv...

Monitoring butterflies and dragonflies in the Netherlands in 2012 De Vlinderstichting (Dutch Butterfly Conservation) and CBS (Statistics Netherlands) coordinate the monitoring schemes for butterflies and dragonflies in the Netherlands. The butterfly scheme started in 1990, the dragonfly scheme in 1998. Method Butterflies and dragonflies are counted...

Photo Guide to the exuviae of Dragonflies in North-West Europe This is the first (Dutch) reference work to present all available knowledge for the identification of the exuvia of Northwest European dragonflies and damselflies. Presents more than 80 species and 2000 spectaculair colour photographs. When a larval dragonfly emerges as a flying adult,...

Monitoring butterflies and dragonflies in the Netherlands in 2011 De Vlinderstichting (Dutch Butterfly Conservation) and CBS (Statistics Netherlands) coordinate the monitoring schemes for butterflies and dragonflies in the Netherlands. The butterfly scheme started in 1990, the dragonfly scheme in 1998. Method Butterflies and dragonflies are count...

The trends of 60 Dutch dragonfly species were calculated for three different periods (1980–1993, 1994–1998 and 1999–2003). Comparing period 1 and period 3 shows that 39 of these species have increased, 16 have remained stable and 5 have decreased. These results show a revival of the Dutch dragonfly fauna, after decades of ongoing decline. The speci...

The more and more frequent presence of Sympetrum meridionale in Northwestern Europe is detailled. The habitats where breeding occurs are briefly described. ______________ Depuis 2000, les observations de Sympetrum meridionale (Selys, 1841) sont devenues fréquentes en Belgique et aux Pays-Bas (DE KNIJF & TERMAAT, 2010). Les premières mentions ont ét...

Since 2000 sightings of Sympetrum meridionale have become frequent in Belgium and The Netherlands. First records came from Belgium, soon followed by observations in The Netherlands. S. meridionale is difficult to identify among other Sympetrum species, notable S. striolatum and S. vulgatum with which in often co-occurs. S. meridionale shows a lot o...