Early-career researchers and technicians group of the International Society of Diatom Research
Young Diatomists Challenge: Diatom microscopy images for a book for 9-10 year old children
An exciting new project awaits those interested in sharing and
increasing the visibility of our beloved (and sometimes dreadded), but
always beautiful diatoms. Emanuela Samaritani is preparing a series of
science books for 9-10 year old children. Most of it will be illustrated
by a professional illustrator, but for the end of the book about
diatoms, Emanuela has asked us to make pictures of diatoms available to
her. We would need some light microscopy pictures of both freshwater and
marine diatoms from different locations, but mostly images of
particular species. All images will be duly credited and those of you
who participate could get one of the wonderful copy of the book.
If you are interested, please contact the young diatomists email.
by Annika Vilmi, Luca Marazzi and Xavier Benito Diatoms inhabit nearly all aquatic ecosystems on Earth, constitute a crucial component at the base of food chains, and are the most diverse group of algae in rivers and lakes (Mann 1999). Our beloved glass-encased algae are powerful indicators of past and present environmental conditions and changes in many ecosystems, ranging from oceans to deep lakes, from springs to wetlands. While diatoms have captivated scientists since the times of Charles Darwin, are they represented enough at general aquatic ecology conferences in the 21stcentury? Below is a summary of the presence of diatoms in three international scientific meetings that we attended last summer. 1) The International Society of Limnologycongress (SIL2018) SIL2018 was held last August in Nanjing, China. During this meeting, around 30 oral and poster presentations dealt with diatoms, at least partly, but only seven had ‘diatom(s)’ in their title (~ 6% and 1% out of 521 contribution…
Antonia Law makes the Diatom of the Month October 2018 writing about Discostella stelligera and how challenging is to tell apart environmental controls on species' occurrence and abundance in lake sedimentsDiscostella stelligera (Krammer and Lange-Bertalot 2000; Houk and Klee 2004), formerly Cyclotella stelligera, is a small (< 10µm) planktonic, centric diatom (Figure 1) commonly found in Arctic, Alpine, tropical and temperate lakes. This diatom species, along with other members of the Discostella family is a fascinating, but problematic diatom for palaeolimnologists. Increasing abundances of D. stelligera have been observed with atmospheric temperature increases in northern hemisphere lakes (e.g. in the Northwest Territories, Canada; Smol et al., 2005) due to a longer ice-free period and associated increases in nutrients (Anderson et al., 1996; Ruhland et al., 2003) and changes in mixing depth and light availability (Saros et al., 2015). However, in lakes in south western Gre…
Andrea Burfeid Castellanos¹ explains to us why we should care about temporary rivers and how diatoms can better assess its ecological status
Intermittent rivers and ephemeral streams (also known as IRES) are a growing concern worldwide. The myriad of ecosystem services and high biodiversity levels they support are severely jeopardized due to the synergistic effects of climate change (i.e., droughts) and increased human usages (Datry et al., 2016). These water bodies are characterized by their temporary or chronic reduction of flow (Stubbington et al., 2017), which can occur naturally or be caused by anthropogenic influences. Most of the studied temporary streams can be found in the Mediterranean climate, where dry summers and torrential downpours in autumn produce substantial variations in water volume (Kalogeropoulos and Chalkias, 2013). These changes also affect water quality, since a reduced flow produces an increase in nutrient and particle concentrations (Becker, 2014).