Sediment Biogeochemistry of Mesophotic Meadows of Calcifying Macroalgae

Sansone, Francis J.; Spalding, Heather L.; Smith, Celia M.

doi:10.1007/s10498-017-9315-9

Cited by 6 publications

(5 citation statements)

References 62 publications

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“…were collected from Maui, O'ahu, and Moloka'i and are saxicolous. Udotea gepporium was collected from O'ahu and has a shallow psammophytic holdfast (Sansone et al 2017;Sauvage et al 2019). Previous studies have found that deeply penetrating, psammophytic macroalgae have higher nitrogen concentrations than saxicolous individuals (Williams 1984(Williams , 1988Sansone et al 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Udotea gepporium was collected from O‘ahu and has a shallow psammophytic holdfast (Sansone et al 2017; Sauvage et al 2019). Previous studies have found that deeply penetrating, psammophytic macroalgae have higher nitrogen concentrations than saxicolous individuals (Williams 1984, 1988; Sansone et al 2017). Our data support these findings as A. lacerata and H. kanaloana had the highest %N (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Nitrogen stable isotopes (δ¹⁵N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Strait

Williams

Sherwood

et al. 2022

Limnology & Oceanography

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The Hawaiian Archipelago stretches 2500 km from the Main to the Northwestern Hawaiian Islands, represents a complex gradient of oceanographic and anthropogenic drivers, and has a high abundance and diversity of native and invasive macroalgae. These photosynthetic organisms occur in intertidal to mesophotic (30–150+ m) depths and absorb nitrogen with limited fractionation associated with their physiology and source. Our goal was to examine nitrogen dynamics from shallow to mesophotic reefs using compositional patterns of two well‐characterized macroalgal tissue parameters: stable isotope ratio of nitrogen and tissue nitrogen content. We collected 813 macroalgal samples from 13 islands/atolls between 0 and 117 m depths. Within the Main Hawaiian Islands, macroalgal tissue stable N isotope ratios were higher in mesophotic depths; N content was higher in shallow depths. However, within the Northwestern Hawaiian Islands, no differences in stable N isotope ratios and N content were found between shallow and mesophotic depths. Regionally, stable N isotope ratios varied along a gradient of anthropogenic and oceanographic processes (in Main and Northwestern Hawaiian Islands, respectively), while N content reflected elevated nitrogen in the Main compared with the Northwestern Hawaiian Islands. Additionally, the invasive macroalga Avrainvillea lacerata had significantly higher N content than co‐occurring native bryopsidalean macroalgae at similar depths, and may be reshaping nutrient dynamics from shallow to mesophotic depths in the Main Hawaiian Islands. Nitrogen dynamics at mesophotic depths may be influenced by nearshore anthropogenically derived nitrogen via submarine groundwater discharge and/or inputs from deeper water within the Main Hawaiian Islands.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Nitrogen stable isotopes (δ¹⁵N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Strait

Williams

Sherwood

et al. 2022

Limnology & Oceanography

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“…Therefore, the dense aggregates of lamellar algae (Ulva intestinalis) distributed at depths of 23 to 30 m, referred to by Rioja-Nieto et al (2012), could be related to nutrient contributions that originate from the percolation of wastewater of hotels, which are usually discharged into the subsoil, as well as anthropogenic contributions derived from the population increase on the island, taking into account that there is only one wastewater treatment plant (PMDC, , 2011;Wizemann et al, 2015;Mayakun and Prathep, 2019). These algae are key members of reef communities, providing vital ecological functions, such as stabilization of reef structure, production of tropical sands, nutrient retention and recycling, primary productivity, and trophic support (Hallock, 2001;Wizemann et al, 2015;Sansone et al, 2017;Mayakun and Prathep, 2019). However, it should be noted that, despite the importance of these algae in reef structures, in most reef phycofloristic records, calcifying green algae occur in a lower proportion, compared to other algal groups (Mateo-Cid and Mendoza-González, 2007;González-Solis et al, 2018;Cruz-Francisco et al, 2020;Piñón-Gimate et al, 2020;López Gómez et al, 2022;Patiño-Espinosa et al, 2022).…”

Section: Abiotic Factorsmentioning

confidence: 99%

Composición taxonómica y afinidad por un sustrato de macroalgas marinas conspicuas del Parque Nacional Arrecifes de Cozumel, Quintana Roo, México

Carranza Ramirez,

Calva Benítez,

Núñez Resendiz

2023

Acta Bot. Mex.

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Antecedentes y Objetivos: Los arrecifes del Parque Nacional Arrecifes de Cozumel constituyen una de las principales formaciones arrecifales de México. Sin embargo, actualmente, son prácticamente inexistentes los estudios ficoflorísticos que permiten detectar cambios en la composición ficoflorística o su afinidad por algún sustrato. Por lo tanto, nuestro objetivo fue determinar la composición taxonómica de macroalgas marinas presentes en el Parque Nacional Arrecifes de Cozumel, así como realizar sus descripciones morfológicas y análisis de afinidad con el sustrato que colonizan. Métodos: Los muestreos se realizaron en octubre y noviembre de 2018 en 14 arrecifes del Parque Nacional Arrecifes de Cozumel, mediante buceo autónomo. Se realizaron observaciones morfo-anatómicas utilizando tanto microscopios ópticos como estereoscópicos. La determinación taxonómica se realizó a partir de literatura especializada. Resultados clave: Se determinaron 42 taxa: cinco Ochrophyta, 12 Rhodophyta y 25 Chlorophyta. La familia mejor representada para Ochrophyta fue Dictyotaceae; para Rhodophyta, Ceramiaceae y Rhodomelaceae; y para Chlorophyta, Halimedaceae. Se describen nuevos registros para el Parque Nacional Arrecifes de Cozumel incluyendo a Lobophora guadeloupensis como nuevo registro para México. Adicionalmente, se identificaron cuatro diferentes sustratos para las algas: psamofítico (33%), epilítico (32%), epizoico (19%) y epífito (16%). Los arrecifes más diversos fueron La Francesa (LF) y Santa Rosa (SR), y los menos diversos fueron Chankanaab (CK) y Tormentos (TM). Conclusiones: Aunque muchos de los registros previos en el área fueron confirmados en el presente estudio, la presencia de 18 nuevos registros reveló, por un lado, la falta de monitoreos constantes de la riqueza algal de la región, y, por otro lado, la necesidad de contar con descripciones morfológicas o referencias fotográficas que permitan contrastar los registros previos con los actuales. Dada la importancia del Parque Nacional Arrecifes de Cozumel, nuestros resultados, además de ofrecer información actualizada, representan un punto de partida para estudios en biología de la conservación.

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“…Recent developments in ocean exploration have begun to reveal the extent of mesophotic benthic photosynthetic organisms (such as corals and algae) [2]. Despite low light levels, these organisms create complex habitats of significant ecological importance, supporting high biodiversity [3][4][5] and efficient biogeochemical cycling [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Red algae acclimate to low light by modifying phycobilisome composition to maintain efficient light harvesting

et al. 2022

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Background Despite a global prevalence of photosynthetic organisms in the ocean’s mesophotic zone (30–200+ m depth), the mechanisms that enable photosynthesis to proceed in this low light environment are poorly defined. Red coralline algae are the deepest known marine benthic macroalgae — here we investigated the light harvesting mechanism and mesophotic acclimatory response of the red coralline alga Lithothamnion glaciale. Results Following initial absorption by phycourobilin and phycoerythrobilin in phycoerythrin, energy was transferred from the phycobilisome to photosystems I and II within 120 ps. This enabled delivery of 94% of excitations to reaction centres. Low light intensity, and to a lesser extent a mesophotic spectrum, caused significant acclimatory change in chromophores and biliproteins, including a 10% increase in phycoerythrin light harvesting capacity and a 20% reduction in chlorophyll-a concentration and photon requirements for photosystems I and II. The rate of energy transfer remained consistent across experimental treatments, indicating an acclimatory response that maintains energy transfer. Conclusions Our results demonstrate that responsive light harvesting by phycobilisomes and photosystem functional acclimation are key to red algal success in the mesophotic zone.

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Sediment Biogeochemistry of Mesophotic Meadows of Calcifying Macroalgae

Cited by 6 publications

References 62 publications

Nitrogen stable isotopes (δ¹⁵N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Nitrogen stable isotopes (δ¹⁵N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Composición taxonómica y afinidad por un sustrato de macroalgas marinas conspicuas del Parque Nacional Arrecifes de Cozumel, Quintana Roo, México

Red algae acclimate to low light by modifying phycobilisome composition to maintain efficient light harvesting

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Sediment Biogeochemistry of Mesophotic Meadows of Calcifying Macroalgae

Cited by 6 publications

References 62 publications

Nitrogen stable isotopes (δ15N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Nitrogen stable isotopes (δ15N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Composición taxonómica y afinidad por un sustrato de macroalgas marinas conspicuas del Parque Nacional Arrecifes de Cozumel, Quintana Roo, México

Red algae acclimate to low light by modifying phycobilisome composition to maintain efficient light harvesting

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Nitrogen stable isotopes (δ¹⁵N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands

Nitrogen stable isotopes (δ¹⁵N) and tissue nitrogen in shallow‐water and mesophotic macroalgae differ between the Main Hawaiian Islands and the Northwestern Hawaiian Islands