Seasonal variability in the population structure of a habitat-forming kelp and a conspicuous gastropod grazer: Do blue-rayed limpets (Patella pellucida) exert top-down pressure on Laminaria digitata populations?

Hereward, Hannah F. R.; Foggo, Andy; Hinckley, Sarah; Greenwood, Joanna C.; Smale, Dan

doi:10.1016/j.jembe.2018.06.011

Cited by 14 publications

(30 citation statements)

References 84 publications

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“…A greater amount of kelp production will enter the food web via direct grazing, as evidenced by the warm-water kelp supporting greater densities of the grazer G. cineraria and being a preferred food source. A similar pattern was found for the tiny limpet P. pellucida, which feeds almost exclusively on kelp (Hereward, Foggo, Hinckley, Greenwood, & Smale, 2018;Leclerc et al, 2013).…”

Section: Discussionsupporting

confidence: 76%

“…A greater amount of kelp production will enter the food web via direct grazing, as evidenced by the warm‐water kelp supporting greater densities of the grazer G. cineraria and being a preferred food source. A similar pattern was found for the tiny limpet P. pellucida , which feeds almost exclusively on kelp (Hereward, Foggo, Hinckley, Greenwood, & Smale, ; Leclerc et al., ). The contrasting grazer preference between kelp species could relate to differences in their biochemical composition, which influences food palatability and nutritional quality.…”

Section: Discussionsupporting

confidence: 63%

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Can ecosystem functioning be maintained despite climate‐driven shifts in species composition? Insights from novel marine forests

2018

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Climate change is driving a redistribution of species and the reconfiguration of ecological communities at a global scale. Persistent warming in many regions has caused species to extend their geographical ranges into new habitats, with thermally tolerant species often becoming competitively dominant over species with colder affinities. Although these climate‐driven changes in species abundance and diversity are well documented, their ecosystem‐level implications are poorly understood, and resolving whether reconfigured communities can maintain fundamental ecosystem functions represents a pressing challenge in an increasingly warmer world. Here, we investigated how climate‐driven substitutions of foundation species influence processes associated with the cycling of organic matter (biomass production, detritus flow, herbivory, decomposition) by comparing two habitat‐forming kelp species with contrasting thermal affinities. We examined the wider ecosystem consequences of such shifts for the observed (and predicted) emergence of novel marine forest communities in the NE Atlantic, which are expected to become more dominated by range‐expanding, warm‐temperate kelp species. Warm‐temperate kelps both accumulated and released 80% more biomass than the cold‐temperate species despite being taxonomically closely related and morphologically similar. Furthermore, the warm‐temperate species accumulated biomass and released detritus year‐round, whereas the cold‐temperate species did so during short, discrete periods. The warm‐temperate kelps supported higher densities of invertebrate grazers and were a preferred food source. Finally, their detritus decomposed 6.5 times faster, despite supporting comparable numbers of detritivores. Overall, our results indicate an important shift in organic matter circulation along large sections of NE Atlantic coastline following the climate‐driven expansion of a warm‐affinity kelp, with novel forests supplying large amounts of temporally continuous—yet highly labile—organic matter. Synthesis. Collectively, our results show that, like species invasions, climate‐driven range expansions and consequent shifts in the identity of dominant species can modify a wide range of important ecosystem processes. However, alterations in overall ecosystem functioning may be relatively limited where foundation species share similar ecological and functional traits.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionsupporting

confidence: 63%

Can ecosystem functioning be maintained despite climate‐driven shifts in species composition? Insights from novel marine forests

2018

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“…During each experiment, two plants were placed into each of 12 individual 130 L tanks filled with local filtered seawater within a recirculating system. Plants were orientated in an upright position by securing holdfasts to rocks using cable ties; duplicate plants were placed at opposite ends of the tanks, ∼50 cm apart, to simulate actual densities recorded in the field (e.g., Smale et al, 2016;Hereward et al, 2018). Two plants were placed in each tank to reflect natural populations (i.e., plants are generally found in stands rather than individually) and to capture between-plant variability.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…capture and release (Schaal et al, 2009;Hereward et al, 2018;Pessarrodona et al, 2018). Recent and projected warming trends have been linked with population losses and range contractions at the equatorward limit of the distributions of both L. digitata (Raybaud et al, 2013) and L. hyperborea (Voerman et al, 2013;Casado-Amezúa et al, 2019) in France and Spain/Portugal, respectively.…”

Section: Ecological Implicationsmentioning

confidence: 99%

“…Canopy-forming kelp species are vital components of mid and high-latitude coastal ecosystems, underpinning core ecological processes such as primary productivity, trophic connectivity and habitat provision (Blight and Thompson, 2008;Smale et al, 2013). As macroalgal species' distributions are strongly constrained by temperature, recent warming trends have driven shifts in their geographical ranges (e.g., Raybaud et al, 2013;Schaal et al, 2016;Pessarrodona et al, 2018) and projected warming will continue drive changes in the coming decades (Müller et al, 2009;Hereward et al, 2018). MHW events further compound decadal-scale ocean warming by exerting acute and intense stress onto organisms, populations, communities, and ecosystems.…”

Section: Ecological Implicationsmentioning

confidence: 99%

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Photophysiological Responses of Canopy-Forming Kelp Species to Short-Term Acute Warming

2019

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Seasonal and spatial variability in rates of primary production and detritus release by intertidal stands of Laminaria digitata and Saccharina latissima on wave‐exposed shores in the northeast Atlantic

Gilson

White

Burrows

et al. 2023

Ecology and Evolution

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Coastal habitats are increasingly recognized as fundamentally important components of global carbon cycles, but the rates of carbon flow associated with marine macrophytes are not well resolved for many species in many regions. We quantified density, rates of primary productivity, and detritus production of intertidal stands of two common intertidal kelp species-Laminaria digitata (oarweed) and Saccharina latissima (sugar kelp)-on four NE Atlantic rocky shores over 22 months. The density of L. digitata was greater at exposed compared to moderately exposed shores but remained consistently low for S. latissima throughout the survey period. Individual productivity and erosion rates of L. digitata did not differ between exposed and moderately exposed shores but differed across exposure levels throughout the year at moderately exposed sites only. Productivity and erosion of S. latissima remained low on moderately exposed shores and showed no clear seasonal pattern. Patterns of productivity and total detrital production (erosion and dislodgement) per m 2 of both L. digitata and S. latissima followed closely that of densities per m 2 , peaking in May during both survey years. Temperature and light were key factors affecting the productivity rates of L. digitata and S. latissima. Erosion rates of L. digitata were affected by wave exposure, temperature, light, grazing, and epiphyte cover, but only temperature-affected erosion of S. latissima. Production of biomass and detritus was greater in L. digitata than in S. latissima and exceeded previous estimates for subtidal and warmer-water affinity kelp populations (e.g., Laminaria ochroleuca). These biogenic habitats are clearly important contributors to the coastal carbon cycle that have been overlooked previously and should be included in future ecosystem models. Further work is required to determine the areal extent of kelp stands in intertidal and shallow subtidal habitats, which is needed to scale up local production estimates to entire coastlines.

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Seasonal variability in the population structure of a habitat-forming kelp and a conspicuous gastropod grazer: Do blue-rayed limpets (Patella pellucida) exert top-down pressure on Laminaria digitata populations?

Cited by 14 publications

References 84 publications

Can ecosystem functioning be maintained despite climate‐driven shifts in species composition? Insights from novel marine forests

Can ecosystem functioning be maintained despite climate‐driven shifts in species composition? Insights from novel marine forests

Photophysiological Responses of Canopy-Forming Kelp Species to Short-Term Acute Warming

Seasonal and spatial variability in rates of primary production and detritus release by intertidal stands of Laminaria digitata and Saccharina latissima on wave‐exposed shores in the northeast Atlantic

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