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News from DTU

2023

14 FEB

Fast food: efficient prey handling in suspension feeding copepods

Copepods are among the most common multicellular organisms on earth and feed on a wide variety of prey. When capturing food, they have to briefly handle it before they can ingest it. However, not much is known about how the handling time impact copepod feeding efficiency.

2022

07 SEP

The feeding behavior of Apocyclops royi

Ambush-feeding copepods passively wait for its prey and capture them by a fast surprise attack. The copepods sense the hydromechanical signals generated by their motile prey. However, the ambush feeding copepod Apocyclops royi can be sustained on a diet of Baker’s yeast, which are small, non-motile cells. We asked how this ambush-feeding...

13 APR

Costs and benefits of predator-induced defense in a toxic diatom

The bloom-forming diatom Pseudo-nitzschia produces a potent neurotoxin, domoic acid, that may cause closure of fisheries. The reason for its production has long been under debate. In a new study (in collaboration with the Natural History Museum of Denmark) we demonstrate a ‘private-good’ benefit to producing the toxins as toxic cells...

08 APR

Species Specific Responses to Grazer Cues and Acidification in Phytoplankton- Winners and Losers in a Changing World

Phytoplankton employ a wide variety of defense against grazers, and rely on chemical cues to assess the current grazing pressure. However, these signals are potentially vulnerable to environmental change, such as ocean acidification. In a collaboration with the Marine Chemical Ecology group at the University of Gothenburg, Sweden, Ocean...

08 APR

Predator field and colony morphology determine the defensive benefit of colony formation in marine phytoplankton

In a new paper, Ocean Life researchers use direct observations of predator-prey interactions to study the defensive benefit of colony formation in four species of phytoplankton.

17 FEB

Thick shells reduce copepod grazing on diatoms

The diatom frustule has been shown to provide protection against grazing copepods, but the mechanisms behind the defense is unknown. In a new paper published in Limnology and Oceanography Letters, we directly observe copepod-diatom interactions and provide a mechanistic understanding of the defense: not only are diatoms with thicker shells...

2021

27 SEP

PhD defence about predator-induced phytoplankton defenses

On 7 October 2021, Fredrik Ryderheim will defend his PhD thesis. The defence is held at DTU in Lyngby and can be watched online.

Biological systems Ecosystems Marine research

15 FEB

Clear benefits without direct costs in dinoflagellate defenses

Many dinoflagellates produce toxins in response to grazers, but costs have been hard to establish experimentally. A new Ocean Life paper examines the effect of nutrient limitation on the trade-offs of defensive toxins.