Die litorale Algenvegetation an den Küsten von Ost‐Venezuelas

Gessner, Fritz; Hammer, Lieselotte

doi:10.1002/iroh.19670520502

Cited by 9 publications

(4 citation statements)

References 2 publications

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“…Also supportive of the view that nutrient supply is critical is the lack of correlation of peak algal growth with factors that have been suggested as important in influencing seasonal variation in algal growth in other non-upwelling tropical locations (Gessner & Hammer 1967, Taylor & Bernatowicz 1969, Croley & Dawes 1970, Santelices 1977, Moorjani 1979, Bryceson 1982, and which might have been suspected of being significant in the present case. The period of greatest intertidal algal development (August to September) does not correspond (Fig.…”

Section: J F M a M J J A S O N D M O N T H --D-t E M P E R A T U R E supporting

confidence: 79%

“…Generally, seasonal periodicity in benthic algal growth in the tropics has been linked to increased light and temperature levels (Taylor & Bernatowicz 1969, Croley & Dawes 1970, to water movement (Gessner & Hammer 1967, Santelices 1977 or to altered levels of herbivory (McClanahan 1988). In southern Arabia however it is presumed (Barratt et al 1986) that the occurrence of dense macroalgal growth during the southwest monsoon is principally due to elevated seawater levels of inorganic nutrients, either nitrate and/or phosphate, although there is no direct evidence yet to demonstrate this.…”

Section: Introductionmentioning

confidence: 99%

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Ecology of intertidal macroalgal assemblages on the Hadramout coast of southern Yemen, an area of seasonal upwelling

Ormond¹,

Banaimoon²

1994

Mar. Ecol. Prog. Ser.

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The species composition and ecology of well-developed macroalgal assemblages that occur on rocky shores of the Hadramout coast of southern Yemen were studied between January 1988 and February 1990. 163 taxa were collected. Qualitative data supported by quantitative biomass samples confirm that there is a very marked seasonal pattern in the growth of the algal species which also show a clear zonation from upper to lower intertidal. The malority of species show greatest growth during the late summer and autumn (August-September); a much smaller period of growth partly involving different species occurs in the spnng (February-March), but during midsummer (May-June) no algal growth is apparent. The late summer/autumn period of maximum growth (with algal biomass typically 5 to 10 times that during spring) follows the onset of the southwest monsoon which is known to generate intense seasonal upwelling of cold nutrient-rich water along the southern Arabian coast, regarded as one of the 5 major upwelling areas within the world ocean system. Measurement of near-shore oceanographic parameters and analysis of local climatological data support the view that the dense autumn growth of intertidal algae occurs as a result of elevated nutrient levels consequent upon this upwelling. The smaller peak in growth in spring is also associated with some elevated nutrient levels, but further study is needed to determine whether this is linked to the onset of the northeast monsoon or to other seasonal factors.

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Section: J F M a M J J A S O N D M O N T H --D-t E M P E R A T U R E supporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Ecology of intertidal macroalgal assemblages on the Hadramout coast of southern Yemen, an area of seasonal upwelling

Ormond¹,

Banaimoon²

1994

Mar. Ecol. Prog. Ser.

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“…Die Bestimmung der Wirkeinheit orientiert sich an den Reaktionen des Planktons auf die physikalischen Erscheinungen, die der Wirkeinheit zugeordnet werden. Mit dieser Einteilung entgehen wir der vorliiufig uniiberschaubaren Verworrenheit mancher okologischer Zusammenhiinge, die gerade fur die Wasserbewegung als eines physikalischen compositum mixtum (GESSNER und HAMMER 1967) so charakteristisch ist. Dabei bleibt es ohne weiteres moglich, mehrere Folgeerscheinungen einer Wirkeinheit fur das Plankton anzugeben und Intensitatsveranderungen ungestort zu registrieren, ohne daB mit einer qualitativen h d erung des Faktorengefiiges gerechnet werden muBte.…”

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Untersuchungen zur ökologischen Bedeutung des Seegangs für das Plankton mit besonderer Berücksichtigung mariner Kieselalgen

Schöne

1970

Intl Review of Hydrobiology

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“…Das Hohlraumsystem stelltsoweit es genugend Licht erhBlteinen besonders extremen Biotop dar, da im Abstand von wenigen Sekunden einmal Luft, dann wieder Seewasser mit sehr grofier Geschwindigkeit durch-geprel3t wird. Abgesehen von den Lithothamnion-Krusten konnte hier nur eine Alge beobachtet werden, Chaetomorpha media, die auch an anderen Stellen der venezolanischen Kuste als Charakterart fur starke Brandung erkannt wurde(GESSNER und HAMMER 1967, HAMMER und GESSNER 1967.2.Als zweiter Biotop kann jener angesehen werden, der aus der meist ebenfalls mit Lithothamnion uberzogenen mehr oder wenig steilen Felsoberflache besteht, wo nur mehr das Wasser der herabfallenden Geysire, nicht aber die Brandungswellen hingelangen. Tn der Hauptsache wurden hier Cladophoropsis memhranacea in dichten Polstern gefunden.3.Der meist ziemlich flache Boden der etwa 1-2 m tiefen und einige m2 gro13en Lithothamnion-pools sei als dritter Biotop angefiihrt.…”

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