The effects of warming on the ecophysiology of two co-existing kelp species with contrasting distributions

Matthew S Hargrave, Andrew Foggo, Albert Pessarrodona, Dan A Smale

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The northeast Atlantic has warmed significantly since the early 1980s, leading to shifts in species distributions and changes in the structure and functioning of communities and ecosystems. This study investigated the effects of increased temperature on two co-existing habitat-forming kelps: Laminaria digitata, a northern boreal species, and Laminaria ochroleuca, a southern Lusitanian species, to shed light on mechanisms underpinning responses of trailing and leading edge populations to warming. Kelp sporophytes collected from southwest United Kingdom were maintained under 3 treatments: ambient temperature (12 °C), +3 °C (15 °C) and +6 °C (18 °C) for 16 days. At higher temperatures, L. digitata showed a decline in growth rates and Fv/Fm, an increase in chemical defence production and a decrease in palatability. In contrast, L. ochroleuca demonstrated superior growth and photosynthesis at temperatures higher than current ambient levels, and was more heavily grazed. Whilst the observed decreased palatability of L. digitata held at higher temperatures could reduce top-down pressure on marginal populations, field observations of grazer densities suggest that this may be unimportant within the study system. Overall, our study suggests that shifts in trailing edge populations will be primarily driven by ecophysiological responses to high temperatures experienced during current and predicted thermal maxima, and although compensatory mechanisms may reduce top-down pressure on marginal populations, this is unlikely to be important within the current biogeographical context. Better understanding of the mechanisms underpinning climate-driven range shifts is important for habitat-forming species like kelps, which provide organic matter, create biogenic structure and alter environmental conditions for associated communities.

Original languageEnglish
Pages (from-to)531-543
Number of pages13
JournalOecologia
Volume183
Issue number2
DOIs
Publication statusPublished - Feb 2017
Externally publishedYes

Fingerprint

ecophysiology
macroalgae
warming
palatability
Laminaria
temperature
biogenic structure
chemical defense
Hypsithermal
habitat
sporophytes
photosynthesis
habitats
environmental conditions
United Kingdom
ambient temperature
organic matter
biogeography
effect
distribution

Cite this

Hargrave, Matthew S ; Foggo, Andrew ; Pessarrodona, Albert ; Smale, Dan A. / The effects of warming on the ecophysiology of two co-existing kelp species with contrasting distributions. In: Oecologia. 2017 ; Vol. 183, No. 2. pp. 531-543.
@article{469a2d2d183849f3af36ea7fac3f588e,
title = "The effects of warming on the ecophysiology of two co-existing kelp species with contrasting distributions",
abstract = "The northeast Atlantic has warmed significantly since the early 1980s, leading to shifts in species distributions and changes in the structure and functioning of communities and ecosystems. This study investigated the effects of increased temperature on two co-existing habitat-forming kelps: Laminaria digitata, a northern boreal species, and Laminaria ochroleuca, a southern Lusitanian species, to shed light on mechanisms underpinning responses of trailing and leading edge populations to warming. Kelp sporophytes collected from southwest United Kingdom were maintained under 3 treatments: ambient temperature (12 °C), +3 °C (15 °C) and +6 °C (18 °C) for 16 days. At higher temperatures, L. digitata showed a decline in growth rates and Fv/Fm, an increase in chemical defence production and a decrease in palatability. In contrast, L. ochroleuca demonstrated superior growth and photosynthesis at temperatures higher than current ambient levels, and was more heavily grazed. Whilst the observed decreased palatability of L. digitata held at higher temperatures could reduce top-down pressure on marginal populations, field observations of grazer densities suggest that this may be unimportant within the study system. Overall, our study suggests that shifts in trailing edge populations will be primarily driven by ecophysiological responses to high temperatures experienced during current and predicted thermal maxima, and although compensatory mechanisms may reduce top-down pressure on marginal populations, this is unlikely to be important within the current biogeographical context. Better understanding of the mechanisms underpinning climate-driven range shifts is important for habitat-forming species like kelps, which provide organic matter, create biogenic structure and alter environmental conditions for associated communities.",
keywords = "Ecosystem, Kelp, Laminaria, Photosynthesis, Temperature",
author = "Hargrave, {Matthew S} and Andrew Foggo and Albert Pessarrodona and Smale, {Dan A}",
year = "2017",
month = "2",
doi = "10.1007/s00442-016-3776-1",
language = "English",
volume = "183",
pages = "531--543",
journal = "Oecologia",
issn = "0029-8549",
publisher = "Springer-Verlag London Ltd.",
number = "2",

}

The effects of warming on the ecophysiology of two co-existing kelp species with contrasting distributions. / Hargrave, Matthew S; Foggo, Andrew; Pessarrodona, Albert; Smale, Dan A.

In: Oecologia, Vol. 183, No. 2, 02.2017, p. 531-543.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The effects of warming on the ecophysiology of two co-existing kelp species with contrasting distributions

AU - Hargrave, Matthew S

AU - Foggo, Andrew

AU - Pessarrodona, Albert

AU - Smale, Dan A

PY - 2017/2

Y1 - 2017/2

N2 - The northeast Atlantic has warmed significantly since the early 1980s, leading to shifts in species distributions and changes in the structure and functioning of communities and ecosystems. This study investigated the effects of increased temperature on two co-existing habitat-forming kelps: Laminaria digitata, a northern boreal species, and Laminaria ochroleuca, a southern Lusitanian species, to shed light on mechanisms underpinning responses of trailing and leading edge populations to warming. Kelp sporophytes collected from southwest United Kingdom were maintained under 3 treatments: ambient temperature (12 °C), +3 °C (15 °C) and +6 °C (18 °C) for 16 days. At higher temperatures, L. digitata showed a decline in growth rates and Fv/Fm, an increase in chemical defence production and a decrease in palatability. In contrast, L. ochroleuca demonstrated superior growth and photosynthesis at temperatures higher than current ambient levels, and was more heavily grazed. Whilst the observed decreased palatability of L. digitata held at higher temperatures could reduce top-down pressure on marginal populations, field observations of grazer densities suggest that this may be unimportant within the study system. Overall, our study suggests that shifts in trailing edge populations will be primarily driven by ecophysiological responses to high temperatures experienced during current and predicted thermal maxima, and although compensatory mechanisms may reduce top-down pressure on marginal populations, this is unlikely to be important within the current biogeographical context. Better understanding of the mechanisms underpinning climate-driven range shifts is important for habitat-forming species like kelps, which provide organic matter, create biogenic structure and alter environmental conditions for associated communities.

AB - The northeast Atlantic has warmed significantly since the early 1980s, leading to shifts in species distributions and changes in the structure and functioning of communities and ecosystems. This study investigated the effects of increased temperature on two co-existing habitat-forming kelps: Laminaria digitata, a northern boreal species, and Laminaria ochroleuca, a southern Lusitanian species, to shed light on mechanisms underpinning responses of trailing and leading edge populations to warming. Kelp sporophytes collected from southwest United Kingdom were maintained under 3 treatments: ambient temperature (12 °C), +3 °C (15 °C) and +6 °C (18 °C) for 16 days. At higher temperatures, L. digitata showed a decline in growth rates and Fv/Fm, an increase in chemical defence production and a decrease in palatability. In contrast, L. ochroleuca demonstrated superior growth and photosynthesis at temperatures higher than current ambient levels, and was more heavily grazed. Whilst the observed decreased palatability of L. digitata held at higher temperatures could reduce top-down pressure on marginal populations, field observations of grazer densities suggest that this may be unimportant within the study system. Overall, our study suggests that shifts in trailing edge populations will be primarily driven by ecophysiological responses to high temperatures experienced during current and predicted thermal maxima, and although compensatory mechanisms may reduce top-down pressure on marginal populations, this is unlikely to be important within the current biogeographical context. Better understanding of the mechanisms underpinning climate-driven range shifts is important for habitat-forming species like kelps, which provide organic matter, create biogenic structure and alter environmental conditions for associated communities.

KW - Ecosystem

KW - Kelp

KW - Laminaria

KW - Photosynthesis

KW - Temperature

U2 - 10.1007/s00442-016-3776-1

DO - 10.1007/s00442-016-3776-1

M3 - Article

VL - 183

SP - 531

EP - 543

JO - Oecologia

JF - Oecologia

SN - 0029-8549

IS - 2

ER -