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To stay, or not to stay? When it comes to nutrient resource patches, researchers from Japan and Switzerland have discovered that marine bacteria have a knack for exploiting them efficiently, timing movements between patches to get the best resources.

Heterotrophic bacteria i. Hotspots of DOM that are made up of particles, such as marine snow, are important to the global carbon cycle.

Borrowing from the field of behavioral ecology, we referred to this process as foraging. The researchers examined microbial foraging by studying the behavior of marine bacteria in seascapes of organic particles.

They conducted experiments using single-cell tracking, where bacteria were video-recorded and the number of bacteria and the amount of time they spent on a surface was extracted and modelled.

Patch use theory, which is part of optimal foraging theory, predicts that organisms foraging in a mixed-resource environment balance the time spent on a patch that yields diminishing returns with the costs of leaving that patch to find a fresh one.

Until this study, the applicability of optimal foraging theory to microorganisms has been largely unknown. Optimal foraging theory -- and specifically patch use theory -- provides a valuable framework for understanding microorganisms and their effects on ecosystems, such as quantifying and predicting the role of marine bacteria in the uptake and cycling of ocean nutrients.

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The researchers examined microbial foraging by studying the behavior of marine bacteria in seascapes of organic particles. They conducted experiments using single-cell tracking, where bacteria were video-recorded and the number of bacteria and the amount of time they spent on a surface was extracted and modelled.

Patch use theory, which is part of optimal foraging theory, predicts that organisms foraging in a mixed-resource environment balance the time spent on a patch that yields diminishing returns with the costs of leaving that patch to find a fresh one.

Until this study, the applicability of optimal foraging theory to microorganisms has been largely unknown. Optimal foraging theory -- and specifically patch use theory -- provides a valuable framework for understanding microorganisms and their effects on ecosystems, such as quantifying and predicting the role of marine bacteria in the uptake and cycling of ocean nutrients.

Materials provided by University of Tsukuba. Note: Content may be edited for style and length. Science News. Story Source: Materials provided by University of Tsukuba.

Constrained optimal foraging by marine bacterioplankton on particulate organic matter. ScienceDaily, 25 September University of Tsukuba.

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