Morphological and phenological reexamination of the threatened endemic species Gelidium canariense (Gelidiales, Rhodophyta) from the Canary Islands

Alfonso, Beatriz; Sangil, Carlos; Sansón, Marta

doi:10.1515/bot-2017-0004

Cited by 3 publications

(2 citation statements)

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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%

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 The endemic macroalgae have been replaced by the globally distributed species Pterocladiella capillacea at nearly all the sites studied.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%

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

et al. 2021

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“…https://doi.org/10.1017/cft.2023.9 Published online by Cambridge University Press Lower canopy forming algae like Gelidium corneum are also considered foundational, or habitat forming species (Quintano et al, 2017;Borja et al, 2018;Muguerza et al, 2022), particularly on some European coasts, with Gelidium canariense representing an important canopy-forming species on Macronesian islands (Alfonso et al, 2017;Hernández, 2021). While these algae are not as tall as the kelps, the canopies formed are similar in height (20 -30 cm) to some of the fucalean-dominated communities (Robertson, 1987;Quintano et al, 2018;Alfonso et al, 2021;Hernández, 2021).…”

Section: Marine Forestsmentioning

confidence: 99%

The role of macroalgal habitats as ocean acidification refugia within coastal seascapes

Edworthy¹,

Steyn²,

James³

2023

Camb. prisms Coast. futures

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Ocean acidification (OA) refers to a global decline in the average pH of seawater driven by the absorption of atmospheric carbon dioxide (CO2). Marine macroalgae, while affected by this pH change, are also able to modify seawater pH through their own interaction with inorganic carbon in the carbonate system. Through this action, macroalgae-dominated habitats are potential refugia from OA for associated marine species. This review summarises the most prominent literature on the role of macroalgae in OA mitigation and the potential of macroalgal habitats to serve as OA refugia. It includes a brief overview of macroalgal distribution in an effort to illustrate where such refugia might be most prevalent. Macroalgae influence seawater carbonate chemistry through the absorption of CO2 and HCO3− during photosynthesis, raising surrounding seawater pH in the process. This transient effect on seawater chemistry could provide some respite from the negative effects of OA for many marine species. This refuge role varies over a range of scales along with macroalgal architecture, which varies in size from low-growing turfs to large canopy-forming stands. The associated pH changes can range over various temporal (daily and seasonal) and spatial (from centimetre to kilometre) scales. Areas of high macroalgal biomass are likely to play an important role as significant OA refugia. Such communities are distributed widely throughout the globe. Large brown macroalgae (Laminariales) dominated communities are common in temperate regions, while members of the Fucales are responsible for substantial macroalgal stands in warmer tropical regions. These marine fields and forests have great potential to serve as localised refuges from OA. While more work needs to be done to clarify the effect of macroalgal communities on seawater pH on a large scale, such refuge areas could become important considerations for the management of marine resources and in protected area selection.

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Herbarium macroalgae specimens reveal a rapid reduction of thallus size and reproductive effort related with climate change

Alfonso

Sansón

Sangil

et al. 2022

Marine Environmental Research

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Morphological and phenological reexamination of the threatened endemic species Gelidium canariense (Gelidiales, Rhodophyta) from the Canary Islands

Abstract: Abstractis a canopy-forming endemic macroalga from the Canary Islands. Vegetative and reproductive characteristics of all phases in its life cycle are examined. Key macromorphological features are its blackish color and the corymbose-to-subfastigiate branching pattern that differentiates

Cited by 3 publications

References 20 publications

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

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

The role of macroalgal habitats as ocean acidification refugia within coastal seascapes

Herbarium macroalgae specimens reveal a rapid reduction of thallus size and reproductive effort related with climate change

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