Gelidiales (Rhodophyta) in the Canary Islands: previous studies and future perspectives

Alfonso, Beatriz; Sangil, Carlos; Sanson, M.T.

doi:10.25145/j.si.2019.02.07

Cited by 2 publications

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“…Temperature is a major factor controlling the rate of photosynthesis and growth in all plants and algae (Davison 1991;Clark et al 2013), and in G. canariense and G. arbuscula, the results suggest that rising air and ocean temperatures are important factors determining their presence and cover in the archipelago. These species inhabit the upper limit of the subtidal zone, so they are exposed to air during low tides and are submerged under the surface of the water for the rest of the time (Polifrone et al 2012;Alfonso et al 2017Alfonso et al , 2019. Consequently, their decrease in cover with the rise in SST and T2m suggest that the species are sensitive to warming and that are vulnerable to changes in seawater but also air temperature during emersion periods.…”

Section: Discussionmentioning

confidence: 99%

“…Species of Gongolaria, Ericaria, Cystoseira, Dictyotales, Gelidiales, geniculate coralline algae (GCA), and crustose coralline algae (CCA) and a mix of turf-forming species compose the main macroalgae assemblages on the rocky shores of the archipelago (Sangil et al 2012(Sangil et al , 2018. The only habitatforming endemic species in the archipelago is Gelidium canariense (Alfonso et al 2019). This perennial red alga inhabits only the upper limit of the subtidal zone along the northern shores of four islands: La Palma, La Gomera, Tenerife, and Gran Canaria.…”

Section: Study Sitementioning

confidence: 99%

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Fast climatic changes place an endemic Canary Island macroalga at extinction risk

et al. 2021

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Global warming and ultraviolet radiation (UVR) affect marine organisms worldwide. However, we still lack knowledge about the consequences of these environmental changes to range-restricted macroalgae species, such as Gelidium canariense, a habitat-forming endemic of the Canary Islands. The aim of this study is to provide useful data for analyzing the conservation status of this endemic species. To do this, (1) we compared distributional data from 1987 with the data collected in 2008 and 2019 along the northern coast of Tenerife; (2) we assessed the variation in macroalgae assemblages dominated by G. canariense over the last decade on this same cost; and (3) we explored the correlation of these results with the actual trends of sea surface temperature (SST), air temperature at 2 m above the sea surface (T2m), UVR, and downward solar radiation (DSR). The results showed significant changes in the distribution of G. canariense in the last 30 years at Tenerife. More than 90% of its populations have declined. The endemic macroalgae have been replaced by the globally distributed species Pterocladiella capillacea at nearly all the sites studied. The cover of G. canariense and Gelidium arbuscula decreased significantly with increasing SST and T2m. Additionally, G. canariense is negatively related to the rise in UVR. These results highlight the vulnerability of both species of Gelidium to global warming and UVR, but especially of G. canariense. The drastic decline of this species reveals the need to upgrade its conservation status and implement protection measures to reduce the damage that predicted global change scenario may have to their relict populations.

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Section: Discussionmentioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Fast climatic changes place an endemic Canary Island macroalga at extinction risk

et al. 2021

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“…Both P. capillacea and P. melanoidea have also been reported from the Canary Islands [ 23 , 24 ]. The relatively widely distributed P. capillacea is a common species in macroalgal assemblages from shallow sublittoral in the Canaries [ 25 ], whereas P. melanoidea has been reported only from a few localities as a eulittoral turf-like species growing in low-light habitats [ 26 , 27 , 28 ]. Subsequent studies carried out on a population from the south of Tenerife revealed plants that, although assigned to P. melanoidea , exhibited vegetative and reproductive morphological features previously unreported in this species [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

A New Species from the Canary Islands Increases the Diversity of the Red Algal Genus Pterocladiella in the Northeastern Atlantic

Rancel-Rodríguez

Afonso-Carrillo

Tronholm

et al. 2023

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Environmental and human factors are inducing a drastic decline in many marine algae in regions with a high floristic richness as in the Canary Islands. Simultaneously, undescribed algal species continue to be discovered, suggesting a probable loss in diversity, before being properly identified and catalogued. Turf-forming Gelidiales occur in marine littoral communities from tropical to warm temperate regions and are challenging to identify correctly because of their small size and simple morphology. In the present study, we combined morphological and molecular phylogenetics methods to study a turf-forming species of the genus Pterocladiella from the Canary Islands (NE Atlantic). Both cox1 and rbcL gene analyses revealed a novel species described here, Pterocladiella canariensis sp. nov. The new species has no single unique morphological feature, but it is different by a distinctive combination of attributes, namely, minute size less than 18 mm in height, ribbon-like erect axes, small polygonal cortical cells, cystocarp circular in outline with placental tissue attached to the floor, spermatangial sori with sterile margins with spermatangia simultaneously formed on both sides of the blade, and tetrasporangia arranged in V-shaped rows. Phylogenies inferred from cox1 and concatenated genes (cox1 + rbcL) suggest a link to only two Pterocladiella species endemic to South Africa and Madagascar; nevertheless, the rbcL gene establishes P. canariensis as the earliest divergent lineage of the genus.

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Gelidiales (Rhodophyta) in the Canary Islands: previous studies and future perspectives

Cited by 2 publications

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Fast climatic changes place an endemic Canary Island macroalga at extinction risk

Fast climatic changes place an endemic Canary Island macroalga at extinction risk

A New Species from the Canary Islands Increases the Diversity of the Red Algal Genus Pterocladiella in the Northeastern Atlantic

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