Leaf dynamics and standing stocks of intertidal Zostera noltii Hornem. and Cymodocea nodosa (Ucria) Ascherson on the Banc d’Arguin (Mauritania)

Vermaat, Jan E.; Beijer, John A. J.; Gijlstra, R.; Hootsmans, M. J. M.; Philippart, C.J.M.; Brink, N.W. van den; Vierssen, W. van

doi:10.1007/978-94-011-1986-3_6

Cited by 12 publications

(19 citation statements)

References 10 publications

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“…Plant material was removed from the sediment using a sieve and divided into above-ground and below-ground components. Each portion was then dried separately in an oven at 105OC for 24 h, and weighed (Young & Kirkman 1975, Dawson 1976, Larkum et al 1984, Vermaat et al 1993.…”

Section: Kaikoura Peninsulamentioning

confidence: 99%

Patch dynamics and response to disturbance of the seagrass Zostera novazelandica on intertidal platforms in southern New Zealand

Ramage¹,

Schiel²

1999

Mar. Ecol. Prog. Ser.

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We examined the patch dynamics of the intertidal seagrass Zostera novazelandica on 2 reef platforms in order to understand the processes governing the establishment, maintenance and mortality of patches. The size distribution of patches at 3 tidal heights (low, mid and high shore) was assessed. Eighty patches, ranglng in initial size from 0.1 to 2.4 m2 surface area, were tagged and video image analysis was used bi-monthly for 14 mo to calculate rates of expansion and contraction of these patches. Permanently marked 150 m2 areas of reef were monitored monthly to record patch recruitment and mortality. Initially, 75% of patches were <0.5 m2 All patches decreased in size during winter, probably due to increased wave action, and expanded during spring and summer. The proportional expansion and contraction of patches was independent of initial patch size. At the end of the study the size distribution of patches was similar to the initial distribution. Patch mortality was restricted to those <0.4 m2, of which 60% disappeared during the study. Larger patches suffered partial mortality through fragmentation. No large patches were formed through the amalgamation of smaller patches. Seedlings recruited into small sediment pockets in tidepools during spring, but few survived through summer because of removal by wave action. Experimental perturbation of patches resulted in increased erosion followed by decreased growth rates and, in many small patches, mortality. Removing only seagrass blades, however, resulted in increased production of new shoots relative to controls. Overall, seagrass patches are susceptible to disturbance, successful rclcruitment by seedlings may be rare or at least episodic, and populations are probably long-Lived and depend on slow vegetative growth for maintenance and expansion.

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Section: Kaikoura Peninsulamentioning

confidence: 99%

Patch dynamics and response to disturbance of the seagrass Zostera novazelandica on intertidal platforms in southern New Zealand

Ramage¹,

Schiel²

1999

Mar. Ecol. Prog. Ser.

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“…(1991), who studied some of these seagrass beds in May 1988, record above-ground biomass values for Zostera noltii ranging from 60-119 g ash-free dry weight (AFDW) M-2 and for Cymodocea nodosa from 41-76 g. Below-ground biomasses were roughly two times higher . Vermaat et al (1993), who studied seagrass beds in April and September 1988, record above-ground biomasses of 38-76 g AFDW M-2 for Z. noltii, 91-100 g for C. nodosa and a total biomass of 24-31 g AFDW m -2 for Halodule wrightii . Below-ground biomasses of Zostera and Cymodocea were higher in April, but roughly equal or even lower in September .…”

Section: Hydrographymentioning

confidence: 99%

The functioning of the ecosystem of the Banc d'Arguin, Mauritania: a review

Wolff¹,

Land

Nienhuis³

et al. 1993

Hydrobiologia

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The Banc d'Arguin, Mauritania, is an area of over 10000 km 2 of shallow water and tidal flats between the Sahara and the upwelling system off the Mauritanian coast . The results of the Dutch-Mauritanian project `Banc d'Arguin 1988' as well as the relevant literature are reviewed in order to develop a preliminary conceptual model of the functioning of this ecosystem . Hydrographically the Banc d'Arguin can be characterized as a large-scale negative estuary with higher salinities near the shore . It is concluded that ultimately the Banc d'Arguin ecosystem is fueled by nutrients and organic matter derived from the upwelling area . The inner part of the Banc d'Arguin system is dominated by a detritus-based benthic foodweb in which seagrasses are the principal primary producers . Little of the seagrass production seems to be exported to other parts of the system or other areas . Zooplankton and zoobenthos biomasses are relatively low, but nevertheless support high densities of consumers . Aquatic birds are especially numerous . The study identifies many research topics for the future .

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“…Most studies on the Present address: Centro de Ciȩ ncias do Mar (CCMAR), Unia versidade do Algarve, Campus de Gambelas,Portugal. phenology and biomass of the species have been conducted in the Mediterranean Sea (Caye and Meinesz 1985, Peduzzi and Vukovič 1990, Buia and Mazella 1991, Terrados and Ró s 1992, Pé rez et al 1994, Mostafa 1996, Rismondo et al 1997, Agostini et al 2003, Terrados et al 2006, whereas research on the biomass and growth of the species in the Atlantic coast is limited to observations in North Africa, including those in the Canary Islands (Reyes 1993, Reyes et al 1995, and Mauritania (Van Lent et al 1991, Vermaat et al 1993.…”

Section: Introductionmentioning

confidence: 99%

Biomass and leaf dynamics of Cymodocea nodosa in the Ria Formosa lagoon, South Portugal

Cunha

Duarte

2007

Botm

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We describe shoot density, aboveground and belowground biomass, form and leaf production per shoot over a one-year cycle for Cymodocea nodosa meadows in the Ria Formosa lagoon (South Portugal). Habitat conditions in Ria Formosa allow the development of lush meadows (up to 1752 shoots m -2 ), supporting high shoot biomass (up to 945 g DW m -2 ), high leaf productivity (up to 14 g DW m -2 d -1 ) and large shoots (up to 113 cm leaf length) despite being located at the northern limit of the distributional range in the Atlantic Ocean. Biomass in the meadows examined is higher than other Atlantic sites with C. nodosa, and comparable to the most productive seagrass meadows yet reported. Shoot morphometry and biomass distribution were variable within Ria Formosa, with the stands growing in muddy sediments having a lower ratio of belowground/aboveground biomass than those in sandy sites. C. nodosa had a clear unimodal growth cycle, reaching maximum leaf development in summer. Mean leaf length and number of leaves per shoot, the rate of appearance of new leaves and the rate of leaf fall, average leaf growth and leaf turnover rates (P/B) were minimal in February and March, and maximal in July and September. The high production of the meadows examined may be related to the high nutrient availability in Ria Formosa, evidenced by the high leaf nutrient content (3.4% of DW and 0.38% of DW for nitrogen and phosphorus, respectively).

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Leaf dynamics and standing stocks of intertidal Zostera noltii Hornem. and Cymodocea nodosa (Ucria) Ascherson on the Banc d’Arguin (Mauritania)

Cited by 12 publications

References 10 publications

Patch dynamics and response to disturbance of the seagrass Zostera novazelandica on intertidal platforms in southern New Zealand

Patch dynamics and response to disturbance of the seagrass Zostera novazelandica on intertidal platforms in southern New Zealand

The functioning of the ecosystem of the Banc d'Arguin, Mauritania: a review

Biomass and leaf dynamics of Cymodocea nodosa in the Ria Formosa lagoon, South Portugal

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