Effects of Sedimentation on the Photobiology of Mesophotic Rhodoliths From the Southwestern Atlantic Ocean

被引:0
|
作者
Curbelo-Fernandez, M. P. [1 ,2 ]
Duarte, H. M. [3 ]
Reis, E. C. [2 ]
Rocha, I. V. [2 ]
Reynier, M. V. [2 ]
Silva, P. R. [4 ]
Tamega, F. T. S. [5 ]
机构
[1] Univ Fed Rio de Janeiro, Dept Biol Marinha, Lab Benthos, Programa Posgrad Ecol,Inst Biol,CCS, Bloco A,Sala 89, BR-21949900 Rio De Janeiro, Brazil
[2] Lab Anal Ambiental LABTOX, Sao Cristovao, Brazil
[3] Univ Fed Rio De Janeiro, Inst Biodiversidade & Sustentabilidade Macae NUPEM, Macae, RJ, Brazil
[4] Ctr Pesquisas Desenvolvimento & Inovacao Leopoldo, Ave Horacio de Macedo 950, Rio De Janeiro, Brazil
[5] Inst Estudos Mar Almirante Paulo Moreira, Dept Biotecnol Marinha, Arraial Do Cabo, RJ, Brazil
关键词
Campos Basin; environmental impact; nongeniculate coralline algae; PAM fluorometry; photosynthetic performance; sediment impact; sediment loads; ESPIRITO-SANTO STATE; DEEP-WATER; CHLOROPHYLL FLUORESCENCE; CRUSTOSE CORALLINE; DRILL CUTTINGS; LIGHT PENETRATION; ALGAE; RHODOPHYTA; HETEROGENEITY; RECRUITMENT;
D O I
10.1002/aqc.70043
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Mesophotic rhodolith beds are free-living nongeniculate coralline algae (NGCA) bioconstructions with slow growth rates and massive associated diversity, distributed worldwide along continental shelves. They are subjected to deleterious impacts of sedimentation from natural and anthropogenic sources, which can bury the thalli, causing photosynthetic reduction and impaired gas exchange, among other effects. There have been only a few studies exploring the consequences of smothering and burial, which limit our knowledge of these type of impact. In this study, we evaluated the photosynthetic response and recovery of NGCA under different sedimentation conditions in the laboratory. Experiments were performed considering different loads of natural sediment (medium sand) during continuous burial periods. The Potential (Fv/Fm) and Effective Quantum Yield (Delta F/Fm ') of photosystem II (PSII) and the relative Electron Transport Rate (rETR) were determined using pulse-amplitude modulated fluorometry as indicators of PSII integrity and photosynthetic activity. PSII functionality (Fv/Fm) was impaired over time under the highest sediment load tested (burial under 100 g of sediment per thallus). However, only 2 days was necessary to recover at least half of the photosynthetic capacity observed in the control samples. This recovery pattern was also supported by Delta F/Fm ' and rETR. Our results illuminated the limits of the resilient behaviour of NGCA to sediment smothering and burial, where long burial periods (2 months) associated with heavy sediment load could cause heavy damage to the photosynthetic apparatus, which can lead to death. However, these organisms could recover after sediment removal. These results provide important information for setting up management strategies to assess the smothering and burial impacts of sediments on rhodoliths.
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页数:11
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