Mark Edlund

Review Board Member - Taxon Contributor
Senior Scientist, Science Museum of Minnesota

Desianti, Nina

 

English, Jonathan

It's definitely a Stauroneis, MaryEllen

 

My research interests have developed around algae, especially the diatoms. Diatoms are microscopic algae characterized by their ornate cell walls made of biologically produced glass. I use diatoms to pursue these research areas:

Because diatoms are made of glass, they accumulate in the bottom of lakes, providing researchers clues to conditions in a lake system in earlier times. Our current research is directed at lakes and National Parks across the Upper Midwest. We use diatoms to determine historical lake response, productivity, and nutrient levels to landuse changes, damming, and management practices. My earlier paleolimnological research was used to develop nutrient criteria for Minnesota lakes, to drive policy that reduces loadings to the St. Croix River, and to investigate historical climate change on Devils Lake, ND, and Russia’s ancient Lake Baikal.

We are currently surveying the diatom flora of western Mongolia’s Valley of the Great Lakes. This landscape is dominated by two large saline lakes (Uvs and Khyargus Nuur) and many smaller lakes that range from fresh to hypersaline. I continue to study diatom biodiversity in an ancient lake system in north-central Mongolia. Lake Hövsgöl is estimated at approximately 1.5 million years old (in comparison to Minnesota’s young lakes, which are rarely over 10,000 years old). These projects are in conjunction with researchers at the National University of Mongolia, the Mongolian Academy of Sciences, the University of Minnesota, the Royal Belgian Institute of Natural Sciences, and the Academy of Natural Sciences of Philadelphia.

Conservative estimates set the number of living diatom species at about 25,000, but knowledge of sexuality and life histories is known for only approximately 200 species. This shortfall provides a modern challenge to further a rich scientific history on algal sexuality. My work in this field has centered on description and cytology of sexuality and dormancy strategies.

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St. Croix Watershed Research Station

Projects


Species Contributed

Aulacoseira italica | Navicula caterva |

Species Reviewed

Aneumastus minor | Aneumastus rostratus | Aneumastus tusculus | Aulacoseira ambigua | Aulacoseira crassipunctata | Aulacoseira granulata | Aulacoseira granulata var. angustissima | Aulacoseira herzogii | Aulacoseira humilis | Aulacoseira subarctica | Cyclostephanos dubius | Cyclotella rossii | Cymbellonitzschia diluviana | Decussata placenta | Denticula tenuis | Diadesmis confervacea | Diatomella balfouriana | Encyonema latum | Encyonema nicafei | Encyonema reimeri | Encyonema temperei | Encyonema yellowstonianum | Encyonopsis aequaliformis | Encyonopsis aequalis | Encyonopsis albertana | Encyonopsis czarneckii | Encyonopsis dakotae | Encyonopsis descripta | Encyonopsis descriptiformis | Encyonopsis hustedtii | Encyonopsis krammeri | Eucocconeis alpestris | Eucocconeis flexella | Eucocconeis laevis | Fragilaria vaucheriae | Navicula aitchelbee | Navicula caroliniae | Navicula gregaria | Navicula piercei | Navicula reichardtiana | Navicula salinarum | Navicula schweigeri | Navicula staffordiae | Navicula subrhynchocephala | Reimeria uniseriata | Stauroneis gracilis | Stauroneis heinii | Stauroneis kishinena | Stauroneis lauenburgiana | Stauroneis pax | Stauroneis phoenicenteron | Stauroneis pikuni | Stauroneis rex | Stauroneis subborealis | Stauroneis supergracilis | Stephanodiscus niagarae | Stephanodiscus reimeri | Stephanodiscus yellowstonensis |

Genera Contributed

Acanthoceras | Achnanthes | Achnanthidium | Actinella | Actinocyclus | Adlafia | Afrocymbella | Amphicampa | Amphipleura | Amphorotia | Aneumastus | Anomoeoneis | Asterionella | Aulacoseira | Bacillaria | Biremis | Brachysira | Brevisira | Caloneis | Campylodiscus | Capartogramma | Cavinula | Chaetoceros | Chamaepinnularia | Cocconeis | Cosmioneis | Craticula | Ctenophora | Cyclostephanos | Cyclotella | Cylindrotheca | Cymatopleura | Cymbella | Cymbellonitzschia | Cymbopleura | Decussata | Delicata | Denticula | Diadesmis | Diatoma | Diatomella | Didymosphenia | Discostella | Distrionella | Ellerbeckia | Encyonema | Encyonopsis | Eolimna | Eucocconeis | Fallacia | Fistulifera | Fragilaria | Fragilariforma | Frustulia | Geissleria | Gomphoneis | Gomphonema | Gyrosigma | Hannaea | Hippodonta | Hydrosera | Hygropetra | Karayevia | Kobayasiella | Lemnicola | Luticola | Mastogloia | Mayamaea | Melosira | Meridion | Microcostatus | Muelleria | Navicula | Navicymbula | Neidium | Nitzschia | Nupela | Orthoseira | Pinnularia | Placoneis | Plagiotropis | Planothidium | Platessa | Playaensis | Pleurosira | Pliocaenicus | Psammothidium | Pseudostaurosira | Pseudostaurosiropsis | Puncticulata | Reimeria | Rhoicosphenia | Rossithidium | Scoliopleura | Sellaphora | Skeletonema | Stauroforma | Staurosira | Staurosirella | Stenopterobia | Stephanocyclus | Stephanodiscus | Surirella | Synedra | Tabellaria | Tabularia | Terpsinoë | Tetracyclus | Thalassiosira | Urosolenia |