The relative contribution of Saccharina nigripes (Phaeophyceae) to the Bay of Fundy Laminariaceae: spatial and temporal variability

Longtin, Caroline M.; Saunders, Gary W.

doi:10.3354/meps11566

Cited by 8 publications

(11 citation statements)

References 43 publications

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“…Recent evidence suggests that H. nigripes is a widespread species in northern hemispheric cold temperate to Arctic locations. Molecularly‐verified specimens of H. nigripes are found from British Columbia over Alaska in the northeastern Pacific to the Canadian Arctic, Atlantic Canada, and Svalbard in the Atlantic (Lund 2014, Moy 2015, Longtin and Saunders 2016, Starko et al 2019, this study) while other Atlantic records from Greenland, Iceland, and Northern Norway (Guiry and Guiry 2019) need molecular confirmation.…”

Section: Discussionmentioning

confidence: 67%

“…2, 5). The general morphological similarity of the two species (Lund 2014, Longtin and Saunders 2015, 2016, this study) is likely an expression of their occurrence in similar habitats which may induce similar morphotypes (Henry 2018). It is recognized that distinct morphological characters in kelps have evolved independently several times in diverse genera (Starko et al 2019a).…”

Section: Discussionmentioning

confidence: 69%

“…A few 2‐ to 3‐year‐old specimens of Hedophyllum nigripes from the exposed location Kapp Guissez compared to semi‐exposed Hansneset (Gontar et al 2001, Hop et al 2002, Voronkov et al 2013) exhibited a very unusual external morphology. H. nigripes is able to tolerate semi‐exposed to exposed habitats, which is known from the Bay of Fundy (Canada) (Longtin and Saunders 2016). These specimens from Kapp Guissez are present in its compressed form: an extremely wide and short digitate blade with a torn appearance and its short‐compressed stipe.…”

Section: Discussionmentioning

confidence: 99%

“…The species Laminaria digitata, which is distributed in the temperate to polar North Atlantic, has been involved in taxonomic confusion (Kain 1979, Bartsch et al 2008, Longtin and Saunders 2016, Guiry and Guiry 2019) owing to phenotypic plasticity. Originally, there have been two unresolved entities that were considered to be closely related to cold‐temperate L. digitata due to their similar external morphology, both from Arctic to Sub‐Arctic habitats: L. nigripes Agardh (1868; synonym of Hedophyllum nigripes ; Starko et al 2019a,b) and L. gunneri Foslie (1883).…”

mentioning

confidence: 99%

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DNA barcoding and mucilage ducts in the stipe reveal the presence of Hedophyllum nigripes (Laminariales, Phaeophyceae) in Kongsfjorden (Spitsbergen)

Dankworth

Heinrich

Fredriksen

et al. 2020

Journal of Phycology

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The Arctic Ocean is a unique ecosystem hosting a biodiversity that has not yet been elucidated in full detail. There is increasing evidence that there are more kelp species constricted to Arctic/sub‐Arctic habitats hitherto not well investigated, such as Hedophyllum nigripes, which is morphologically very similar to cold‐temperate Laminaria digitata. Hedophyllum nigripes was originally described as L. nigripes by Agardh from Spitsbergen but has often been misidentified as L. digitata in the European Arctic. We initiated a systematic algal survey along a depth gradient (0–7.5 m) in Kongsfjorden (Spitsbergen) in June and July 2015 and thereby confirmed a predominant presence of H. nigripes (73%). Hedophyllum nigripes is occurring between 0 and 7.5 m while L. digitata was most abundant at 2.5 m depth. Hedophyllum nigripes individuals were generally younger (2.3 vs. 3.6 years) and stipe and blade length shorter (31 vs. 54 cm and 76 vs. 96 cm, respectively) compared to L. digitata. A combination of molecular (COI‐5P) and morpho‐anatomical tools (presence of sori and mucilage ducts in the stipe) was used to differentiate specimens of H. nigripes and L. digitata. Both kelp species were indistinguishable in most cases by external blade and stipe morphology. The different blade shapes represented different ontogenetic stages rather than phenotypic plasticity. The presence of mucilage ducts in the stipe was correlated with H. nigripes and changed with depth from 17%, 36%, and 85% at 2.5, 5, and 7.5 m, respectively. In addition, all summer fertile specimens were L. digitata.

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Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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DNA barcoding and mucilage ducts in the stipe reveal the presence of Hedophyllum nigripes (Laminariales, Phaeophyceae) in Kongsfjorden (Spitsbergen)

Dankworth

Heinrich

Fredriksen

et al. 2020

Journal of Phycology

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“…According to Pedersen (2011), all digitate Laminaria species on Greenland belong to Laminaria nigripes J. Agardh, a species originally described from Svalbard by Agardh in 1868 (Agardh 1868). According to Longtin and Saunders (2016), L. nigripes should be included in the genus Saccharina as Saccharina nigripes (J. Agardh) C. Longtin & G.W. Saunders. Kelp species in Svalbard are mostly the same as found along the Norwegian mainland.…”

Section: The Kelp Flora Of Svalbard and Kongsfjordenmentioning

confidence: 99%

Kelps and Environmental Changes in Kongsfjorden: Stress Perception and Responses

Bischof

Buschbaum

Fredriksen

et al. 2019

Advances in Polar Ecology

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On rocky substrata along shallow water cold-temperate and Arctic coastlines, large brown seaweeds ("kelps") form structure-and organism-rich habitats of vast ecological significance. The distribution of these ecosystem engineers is largely controlled by the prevailing temperature, light regime and substrate availability, but can also be influenced by biotic interactions within the kelp communities. In Kongsfjorden, right in the transition of an Arctic to an Atlantic fjord system, the

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Kelp forest community structure and demography in Kongsfjorden (Svalbard) across 25 years of Arctic warming

Düsedau,

Fredriksen,

Brand

et al. 2024

Ecology and Evolution

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The Arctic archipelago of Svalbard is a hotspot of global warming and many fjords experience a continuous increase in seawater temperature and glacial melt while sea‐ice cover declines. In 1996/1998, 2012–2014, and 2021 macroalgal biomass and species diversity were quantified at the study site Hansneset, Kongsfjorden (W‐Spitsbergen) in order to identify potential changes over time. In 2021, we repeated the earlier studies by stratified random sampling (1 × 1 m2, n = 3) along a sublittoral depth transect (0, 2.5, 5, 10, and 15 m) and investigated the lower depth limits of dominant brown algae between 3 and 19 m. The maximum fresh weight (FW) of all seaweeds was 11.5 kg m−2 at 2.5 m and to 99.9% constituted of kelp. Although biomass distribution along the depth transect in 2021 was not significantly different compared to 2012/2013, the digitate kelp community (Laminaria digitata/Hedophyllum nigripes) had transformed into an Alaria esculenta‐dominated kelp forest. Consequently, a pronounced shift in kelp forest structure occurred over time as we demonstrate that biomass allocation to thallus parts is kelp species‐specific. Over the past decade, kelp demography changed and in 2021 a balanced age structure of kelps (juveniles plus many older kelp individuals) was only apparent at 2.5 m. In addition, the abundances and lower depth limits of all dominant brown algae declined noticeably over the last 25 years while the red algal flora abundance remained unchanged at depth. We propose that the major factor driving the observed changes in the macroalgal community are alterations in underwater light climate, as in situ data showed increasing turbidity and decreasing irradiance since 2012 and 2017, respectively. As a consequence, the interplay between kelp forest retreat to lower depth levels caused by coastal darkening and potential macroalgal biomass gain with increasing temperatures will possibly intensify in the future with unforeseen consequences for melting Arctic coasts and fjord ecosystem services.

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The relative contribution of Saccharina nigripes (Phaeophyceae) to the Bay of Fundy Laminariaceae: spatial and temporal variability

Cited by 8 publications

References 43 publications

DNA barcoding and mucilage ducts in the stipe reveal the presence of Hedophyllum nigripes (Laminariales, Phaeophyceae) in Kongsfjorden (Spitsbergen)

DNA barcoding and mucilage ducts in the stipe reveal the presence of Hedophyllum nigripes (Laminariales, Phaeophyceae) in Kongsfjorden (Spitsbergen)

Kelps and Environmental Changes in Kongsfjorden: Stress Perception and Responses

Kelp forest community structure and demography in Kongsfjorden (Svalbard) across 25 years of Arctic warming

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