Hilda Canter-Lund Shortlist 2018

We do not publish the email addresses of the shortlisted contributors. If you wish to contac them, please first email the Society at this address: hcl_competition@brphycsoc.org


Karie Holterman

This image shows a benthic sample collected from a California lake. DNA containing structures (nucleoids-green) were visualized by Syber Green I fluorescent stain in Oscillatoria splendida growing among benthic diatoms (chlorophyll autofluorescence- red) using fluorescence microscopy. The trichomes of O. splendida possess a characteristic acuminate apical cell.

Oscillatoria sp. is a ubiquitous photosynthetic cyanobacterium named for the ability of it's trichomes to move back and forth or "oscillate" toward a light source. This order of cyanobacteria is unique as it is able to conduct anoxygenic photosynthesis by reduction of sulfate. Oscillatoria sp. are found in marine environments, fresh water environments and even hot springs throughout the world. Some species are capable of producing anatoxins and microcystins.

The cell ultrastructure of shows single thylakoids which often run parallel to one another. The thylakoids contain photosynthetic pigments like chlorophyll a, carotenes, xanthophyll's and phycobilins. The centroplasm represents the incipient nucleus called gonophore. It is represented by DNA fibrils.



Leah Reidenbach: Ulva community in a rocky intertidal area

This photograph was taken in Tasmania, Australia at the Bay of Fires Conservation area. Here, a patch of an Ulva and mussel dominated community thrives offering a stark contrast to the white sand that has accumulated in a shallow rocky intertidal area. Bubbles on the surface of the macroalgae demonstrate how Ulva photosynthesis contributes to oxygenating the water. This photograph was taken with a Canon Rebel T1i using a 50mm lens.



José M. Fariñas-Franco: High tide in Connemara

 

I took this image on my way back from a dive off Aillwee, in the Connemara region, Ireland. The visibility had been quite bad and swimming around the muddy shoreline provided an unexpected and more satisfying experience. The intertidal zone comes alive at high water with the now floating strands of the brown algae Fucus vesiculosus and Ascophyllum nodosum attracting shoals of juvenile fish in search of prey. I used an Olympus TG5 camera in an Ikelite housing with no additional lighting.



John Huisman: A New Ganonema

Over the last decade I have participated in several field trips to remote parts of northern Western Australia, with the aim of documenting the marine plants that occur in this largely unexplored region. Numerous new species have been discovered, one of which is this new Ganonema, collected from offshore atolls such as Scott Reef and Ashmore Reef, where this photo was taken. Ganonema is a genus of calcified, often mucilaginous red algae, the calcification occurring as granules in the cortex and not forming a firm skeleton. At Ashmore the new species was growing in coarse coral rubble at 12 metres depth. The photograph was taken while SCUBA diving, with a Nikon Coolpix P7100 in a housing with twin Inon strobes providing fill flash.



Rafael Martín-Ledo: Drifting diatoms

Phase contrast image of a live colony of Licmophora sp. More than twenty pairs of frustules are adhered to a branched stem. In every cell, each 120 μm long, two plastids are visible. Licmophora is a genus of diatoms epiphytic or attached to flotsam; what we are seeing is a fragment dragged by tidal currents.

The specimen was sampled in Bay of Santander (Spain) in March 2018 with an Apstein-type plankton net. This photo was taken with a Canon EOS 80D camera coupled directly, without any intermediate lens, to Nikon Eclipse E600 microscope (20x Plan Fluor Ph1 objective), using polarized light and a lambda plate.



Kristen Brown: Chlorodesmis fastigiata on a coral reef

Chlorodesmis fastigiata settles on top of a coral. While the role of tropical macroalgae on coral reef ecosystems is debated, the interactions between macroalgae and coral are believed to play fundamental role in the degradation of coral reefs. This photo was taken in February 2016 in the Heron Island lagoon of the southern Great Barrier Reef, while investigating the dynamics of coral-algal interactions on coral reef ecosystems.