Marine Algae of California

Abbott, Isabella A.; Hollenberg, George J.

doi:10.1515/9781503621053

Cited by 65 publications

(53 citation statements)

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“…1). The algal host in southern California is recognized as Vaucheria loiigicaidis (Abbott and Hollenberg 1976); however, this nominal taxon likely comprises a cryptic species complex, as there has been no detailed taxonomic assessment of Vaucheria spp. from the northeastern Pacific.…”

Section: Study Sites and Taxamentioning

confidence: 99%

Poecilogony and larval ecology in the gastropod genus Alderia*

Krug¹

2007

American Malacological Bulletin

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The gastropod genus Alderia (Allman, 1845) (Opisthobranchia; Sacoglossa) contains a rare case of poecilogony, or variable larval development within a species. This paper reviews the alternative larval morphs and dispersal strategies expressed by Alderia spp., and presents new data on larval ecology, environmentally induced changes in development, and rates of metamorphosis for larvae differing in age and life history. Recent morphological and molecular analyses revealed a ciTptic poecilogonous species in the previously monotypic genus Alderia. The newly described Alderia willowi Krug et ai, 2007 occurs south of Bodega Harbor, California, and was the subject of all prior studies by Krug and co-workers. Unlike its strictly planktotrophic congener Alderia modesta (Loven, 1844), A. willowi produces either small feeding larvae that have a 30-day pre-competent period or large larvae that need not feed to metamorphose. Individuals can vary the developmental mode of their offspring, with a variable proportion switching from lecithotrophy (prevalent in summer) to planktotrophy in winter or spring; a similar shift is induced in some adults upon transfer to the laboratory. In a second dispersal polymorphism, a variable percentage of lecithotrophic larvae undergo spontaneous metamorphosis within 2 days of hatching, while their siblings disperse until induced to settle by carbohydrate cues from the host algae Vaiicheria spp. The percentage of spontaneous metamorphosis is uncorrelated with fecundity and is generally between 15-30%, a possible product of stabilizing selection on this bet-hedging dispersal strategy. Despite their different ages, competent larval morphs produced by alternative developmental pathways are similar in size, swimming behavior, and responses to dissolved settlement cues. However, competent planktotrophic larvae and older lecithotrophic larvae initiated metamorphosis faster after settlement than newly hatched lecithotrophic larvae, suggesting a link between planktonic period and habitat choice. Although rare, poecilogonous species like A. willowi offer special insights into the evolutionary causes and ecological consequences of alternative life histories.

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Section: Study Sites and Taxamentioning

confidence: 99%

Poecilogony and larval ecology in the gastropod genus Alderia*

Krug¹

2007

American Malacological Bulletin

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“…Endophytes were identified using descriptions of filamentous ectocarpalean algae [ 50 , 51 , 52 , 53 , 54 , 55 ]. Identification images of endophytes and information on species identification are provided in Figure S1 .…”

Section: Methodsmentioning

confidence: 99%

Effect of Temperature and Light Intensity on the Polar Lipidome of Endophytic Brown Algae Streblonema corymbiferum and Streblonema sp. In Vitro

2022

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The effect of temperature and light intensity on the polar lipidome of endophytic brown algae Streblonema corymbiferum and Streblonema sp. in vitro was investigated. More than 460 molecular species have been identified in four glycoglycerolipids classes, five phosphoglycerolipids classes and one betaine lipid class. The lipids glucuronosyldiacylglycerol and diacylglyceryl-N,N,N-trimethyl-homoserine were found in the algae of the order Ectocarpales for the first time. A decrease in cultivation temperature led to an increase in the unsaturation level in all classes of polar lipids. Thus, at low temperatures, the content of 18:4/18:4 monogalactosyldiacylglycerol (MGDG), 20:5/18:4 digalactosyldiacylglycerol (DGDG), 18:3/16:0 sulfoquinovosyldiacylglycerol (SQDG), 18:3/18:3 and 18:3/18:4 phosphatidylglycerol (PG), 20:4/20:5 and 20:5/20:5 phosphatidylethanolamine (PE), 14:0/20:5, 16:0/20:5 and 20:5/20:5 phosphatidylcholine (PC), 20:5/20:4 phosphatidylhydroxyethylglycine and 18:1/18:2 DGTS increased. At high temperatures, an increase in the content of chloroplast-derived MGDG, DGDG and PG was observed. Both low and high light intensities caused an increase in 20:5/18:3 MGDG and 18:3/16:1 PG. At low light intensity, the content of DGDG with fatty acid (FA) 18:3 increased, and at high light intensity, it was with FA 20:5. The molecular species composition of extraplastid lipids also showed a dependence on light intensity. Thus, the content of PC and PE species with C20-polyunsaturated FA at both sn-positions, 18:1/18:1 DGTS and 16:0/18:1 phosphatidylinositol increased. Low light intensity induced a significant increase in the content of chloroplast-derived 18:1/16:1 phosphatidylethanolamine.

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“…M. splendens (formerly Iridaea chordata), a red alga (Rhodophyta) that has a short (1-2 cm), narrow stipe supporting one wide blade (typically 20 -40 cm long), is abundant in low intertidal and high subtidal habitats of rocky shores along the Pacific coast of North America that are subjected to low or intermediate wave exposure (Abbott and Hollenberg, 1992;Shaughnessy et al, 1996). M. splendens are also common on man-made structures such as docks, pilings, and breakwaters (Figures 1A, B).…”

Section: Research Systemmentioning

confidence: 99%

“…This species has a complex life cycle with sexual stages (haploid male or female gametophytes) and an asexual stage (diploid tetrasporophyte), all of which have the same thallus morphology and co-occur at the same sites (Dyck and de Wreede, 2006a). The density of M. splendens blades is generally higher in the summer (Dyck and de Wreede, 2006b) and larger individuals are dislodged during winter storms (Bell, 1999), but they have a perennial, fleshy holdfast out of which new thalli can grow (Abbott and Hollenberg, 1992;Bell, 1999).…”

Section: Research Systemmentioning

confidence: 99%

Hydrodynamic Interactions Between Macroalgae and Their Epibionts

Koehl

Daniel

2022

Front. Mar. Sci.

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Macroalgae provide surfaces where other organisms live. Unlike organisms on rigid substrata, epibionts on host macroalgae sit on flexible surfaces that bend, stretch, and move in turbulent water currents and waves. We used blade-like red algae, Mazzaella splendens, and encrusting bryozoans, Membranipora membranacea, to investigate the biomechanical and hydrodynamic effects of encrusting epibionts on macroalgae, and of flexible hosts on epibiotic bryozoans. Passive flapping by algae in wave-driven ambient flow enhanced renewal of water near hosts and epibionts. Wave exposure and the presence of a surrounding canopy of flexible algae altered the locations along algal blades where bryozoans encountered the highest time-averaged boundary shear velocities. Hydrodynamic forces on flexible algae moving back-and-forth with the water were lower in waves than in unidirectional flow. Bryozoan epibionts increased hydrodynamic forces on host algae by affecting their reconfiguration in moving water. Encrusting bryozoans increased the flexural stiffness of algal blades, but the elastic modulus, extensibility, and strength of blade tissue was unaffected by bryozoan epibionts. Algal blades were more extensible and stronger than bryozoans, so bryozoans fractured or popped off stretched algae. Algae in rapid-flow habitats had few epibionts, and encrusted algae transplanted from a protected to a wave-exposed habitat lost their epibionts.

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Marine Algae of California

Cited by 65 publications

References 0 publications

Poecilogony and larval ecology in the gastropod genus Alderia*

Poecilogony and larval ecology in the gastropod genus Alderia*

Effect of Temperature and Light Intensity on the Polar Lipidome of Endophytic Brown Algae Streblonema corymbiferum and Streblonema sp. In Vitro

Hydrodynamic Interactions Between Macroalgae and Their Epibionts

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