Age affects the strain‐rate dependence of mechanical properties of kelp tissues

Burnett, Nicholas; Koehl, M. A. R.

doi:10.1002/ajb2.1662

Cited by 6 publications

(2 citation statements)

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“…By studying organism tissues using mechanical tests developed by materials scientists (e.g., Wainwright et al 1976, Koehl & Wainwright 1984, Vincent 2012, we measured their stiffness, resilience, strength, and toughness (Koehl 1977b(Koehl , 1982(Koehl , 1999Koehl & Wainwright 1977;Holbrook et al 1991;Johnson & Koehl 1994;Burnett & Koehl 2019, 2021Koehl & Daniel 2022). With that information, we could predict how much they deform and whether they break under different environmental conditions.…”

Section: Highmentioning

confidence: 99%

“…For example, when the viscoelastic connective tissue of the body walls of sea anemones was subjected to stress regimes mimicking those experienced in nature, I discovered that it is stiff and resilient when subjected to brief stresses simulating repetitive stretching by waves, but can be extended to twice its resting length when subjected overnight to low stress due to the small internal pressure sea anemones use to inflate themselves (Koehl 1977b). Frond tissue of some macroalgae is stronger when stretched rapidly to simulate wave impingement than when pulled more slowly (Burnett & Koehl 2021). The shearthinning mucus attaching a sea-slug larva to a surface acts like an elastic bungee cord when hit with pulses of flow like those that larvae encounter on coral reefs, but it flows like a liquid and breaks at low stress if subjected to the steady shear flow traditionally used to measure adhesive strengths of microorganisms (Koehl 2023).…”

Section: Temporal Variationmentioning

confidence: 99%

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A Life Outside

Koehl

2024

Annu. Rev. Mar. Sci.

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How do the morphologies of organisms affect their physical interactions with the environment and other organisms? My research in marine systems couples field studies of the physical habitats, life history strategies, and ecological interactions of organisms with laboratory analyses of their biomechanics. Here, I review how we pursued answers to three questions about marine organisms: ( a) how benthic organisms withstand and utilize the water moving around them, ( b) how the interaction between swimming and turbulent ambient water flow affects where small organisms go, and ( c) how hairy appendages catch food and odors. I also discuss the importance of different types of mentors, the roadblocks for women in science when I started my career, the challenges and delights of interdisciplinary research, and my quest to understand how I see the world as a dyslexic. Expected final online publication date for the Annual Review of Marine Science, Volume 16 is January 2024. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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Section: Highmentioning

confidence: 99%

Section: Temporal Variationmentioning

confidence: 99%

A Life Outside

Koehl

2024

Annu. Rev. Mar. Sci.

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Individuals from non-native populations are stronger and bigger than individuals from native populations of a widespread seaweed

et al. 2022

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Freezing and Mechanical Failure of a Habitat-Forming Kelp in the Rocky Intertidal Zone

Zuelow,

Roberts,

Burnaford

et al. 2024

Integrative and Comparative Biology

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Kelp and other habitat-forming seaweeds in the intertidal zone are exposed to a suite of environmental factors, including temperature and hydrodynamic forces, that can influence their growth, survival, and ecological function. Relatively little is known about the interactive effect of temperature and hydrodynamic forces on kelp, especially the effect of cold stress on biomechanical resistance to hydrodynamic forces. We used the intertidal kelp Egregia menziesii to investigate how freezing in air during a low tide changes the kelp's resistance to breaking from hydrodynamic forces. We conducted a laboratory experiment to test how short-term freezing, mimicking a brief low tide freezing event, affected the kelp's mechanical properties. We also characterized daily minimum winter temperatures in an intertidal E. menziesii population on San Juan Island, WA near the center of the species’ geographic range. In the laboratory, acute freezing events decreased the strength and toughness of kelp tissue by 8 to 20% (change in medians). During low tides in the field, we documented sub-zero temperatures, snow, and low canopy cover (compared to summer surveys). These results suggest that freezing can contribute to frond breakage and decreased canopy cover in intertidal kelp. Further work is needed to understand whether freezing and the biomechanical performance in cold temperatures influence the fitness and ecological function of kelp, and whether this will change as winter conditions, such as freezing events and storms, change in frequency and intensity.

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Age affects the strain‐rate dependence of mechanical properties of kelp tissues

Abstract: Macroalgae on wave-and current-swept shores are subjected throughout their lives to hydrodynamic forces imposed by ambient water motion (e.g.

Cited by 6 publications

References 46 publications

A Life Outside

A Life Outside

Individuals from non-native populations are stronger and bigger than individuals from native populations of a widespread seaweed

Freezing and Mechanical Failure of a Habitat-Forming Kelp in the Rocky Intertidal Zone

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