Positive associations between macroalgal species in a rocky intertidal zone and their effects on the physiological performance of Ulva lactuca

Molina‐Montenegro, Marco A.; Muñoz, Alejandro Anaya; Badano, Ernesto I.; Morales, Billy W.; Fuentes, Katia M.; Cavieres, Lohengrin A.

doi:10.3354/meps292173

Cited by 34 publications

(26 citation statements)

References 38 publications

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“…Moreover, almost insignificant correlation resulted between the total epiphytic count on each algal host and these parameters, suggesting that there are other factors, which can be the limiting ones rather than water quality such as irradiance, desiccation, wave exposure and water motion and substratum (Molina-Montenegro et al, 2005). In this trend Michelutti et al (2003) found that the impact of substrate type on species assemblages is more effective than water chemistry.…”

Section: Discussionmentioning

confidence: 99%

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

El-Din¹,

Shaltout²,

Nassar³

et al. 2015

American Journal of Environmental Sciences

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Abstract:A qualitative and quantitative study on the epiphytic microalgae and epiphytic zooplankton were conducted in order to follow up their community structures on seaweeds in relation to some physicochemical variables in the coastal waters of the Eastern Harbor of Alexandria. Water and macroalgal samples were collected seasonally during two years successively: Winter, summer, autumn (2012) and spring (2013). The collected seaweeds were Ulva fasciata (green alga), Corallina mediterranea, Corallina officinalis, Gelidium sp., Pterocladiella capillacea, Hypnea musciformis and Grateloupia doryphora (red algae). The studied water quality parameters were pH, salinity, dissolved oxygen, oxidizable organic matter and nutrient salts. The abundance of epiphytes were significantly different between morphotypes (two-way ANOVA), p≤0.05; ranking the branched thalli as the first preference for microalgal epihytes, sheet-like thalli with a smooth surface as the second one, while the lowest rank was for the mucilaginous species. The same result was found for epiphytic zooplankton. The results of the statistics revealed insignificant seasonal variations in the epiphytic microalgae and very weak correlations between the abundance of microalgae and the physico-chemical parameters. In contrast, there were significant differences for epiphytic zooplanktonic seasonal variations. Whereas, the zooplankton count was correlated preferably with environmental water salinity, followed by nutrients.

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Section: Discussionmentioning

confidence: 99%

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

El-Din¹,

Shaltout²,

Nassar³

et al. 2015

American Journal of Environmental Sciences

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“…The ecophysiological foundations underlying these patterns in southeastern Pacific seaweeds are poorly understood. Only recently have some aspects of photosynthetic performance under desiccation stress (Molina-Montenegro et al 2005), the capacity of photoinhibition (as a photoprotective mechanism; Gómez et al 2004), and UV stress tolerance (Huovinen et al 2006, Rautenberger et al 2009) been studied.…”

Section: Introductionmentioning

confidence: 99%

Morpho-functional patterns and zonation of South Chilean seaweeds: the importance of photosynthetic and bio-optical traits

Gómez

Huovinen²

2011

Mar. Ecol. Prog. Ser.

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We address the question of whether seaweed zonation can be characterized in terms of light absorption, pigmentation, photosynthetic parameters, photoinhibition, and thallus structure. Based on 32 seaweed species from the Pacific coast of southern Chile, intertidal assemblages exhibited higher light requirements for photosynthesis (E k ) and lower thallus light absorptances than subtidal algae. E k values were lower than the highest measured irradiances at the corresponding natural depths, suggesting that photosynthesis in these organisms could potentially occur at lower depths. During summer, 1% of photosynthetically active radiation (PAR) reached a depth of 23 m, while UV-B and UV-A wavelengths were completely attenuated at < 3 and 6 m, respectively. Overall, the photobiological adaptations were associated with depth, morphology, and taxonomic group. Photoinhibition was similar in algae from different depths, although recovery was higher in upper littoral algae than in infra-and sublittoral species. The characteristics conferring competitive abilities in light use and light stress tolerance were not, or only partially, related to the classical Littler form-function model. The filamentous and foliose forms were able to acclimate rapidly to changing light and physical stress in the supralittoral zone. For infralittoral kelps living in a highly dynamic environment, higher cross-sectional area and enhanced in vivo light absorption were coupled with morphological features (e.g. massive thallus) that are advantageous in withstanding e.g. water movement. By contrast, the rapid physiological adjustments that allow algae to endure solar stress (e.g. photochemical down-regulation) were strongly dependent on the position on the shore but not on gross morphology.

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“…Underlying mechanisms include photoinhibition (Davison et al 1993), and thermal (Schonbeck & Norton 1978) and osmotic stresses (Hawkins & Jones 1992). These effects can be exacerbated by climate events such as global warming and storminess (Navarrete et al 1993, Barry et al 1995, Sanford 1999), which in turn can affect biological interactions (Bertness & Leonard 1997, Bertness et al 1999, Molina-Montenegro et al 2005.…”

Section: Introductionmentioning

confidence: 99%

Changes in temporal variance of rocky shore organism abundances in response to manipulation of mean intensity and temporal variability of aerial exposure

Bertocci¹,

Vaselli²,

Maggi³

et al. 2007

Mar. Ecol. Prog. Ser.

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We tested the hypothesis that mean intensity and temporal variability of aerial exposure exert interactive effects on temporal variance in abundances of algae and invertebrates on rocky shores of the NW Mediterranean Sea. Transplantations of assemblages to different heights on the shore were used to manipulate the aerial exposure indirectly. Different periods of residency of assemblages at each height were distributed over 2 yr to generate different levels of temporal variability of aerial exposure. Total durations of periods of emersion and submersion of organisms were kept comparable across all treatments to avoid confusion between intensity and temporal variability of aerial exposure. Interactive effects between these 2 factors were observed for some response variables (filamentous and encrusting coralline algae, Chthamalus stellatus, Patella spp. and number of taxa), with mean intensity of aerial exposure either magnifying or dampening effects of temporal variability. Specific responses were related to the life histories of the focal organisms, in particular the ability to resist and to recover from aerial exposure. The experimental design we used can help in separating effects of shifts in mean values and temporal variances of climate variables in studies of climate change.

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Positive associations between macroalgal species in a rocky intertidal zone and their effects on the physiological performance of Ulva lactuca

Cited by 34 publications

References 38 publications

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

Ecological Studies of Epiphytic Microalgae and Epiphytic Zooplankton on Seaweeds of the Eastern Harbor, Alexandria, Egypt

Morpho-functional patterns and zonation of South Chilean seaweeds: the importance of photosynthetic and bio-optical traits

Changes in temporal variance of rocky shore organism abundances in response to manipulation of mean intensity and temporal variability of aerial exposure

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