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The Production of calcareous sediment by Halimeda incrassata in the Puerto Morelos Lagoon, Mexican caribbean

Dijk, K.J. van (1999) The Production of calcareous sediment by Halimeda incrassata in the Puerto Morelos Lagoon, Mexican caribbean. Master's Thesis / Essay, Biology.

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Halimeda incrassata is the most abundant of Halimeda species growing in the Puerto Morelos reef lagoon (Mexico). Somatic plus calcareous dry biomass was 120.32 g m2, 117.99 g m2 and 77.90 g m2 at the Reef-, Lagoon-, and Beach-station respectively. Growth was measured during a period of two weeks in the months November, December (1997) and January (1998) using Alizarin Red S as colouring agent. Different variables were measured to establish a time sparing methodology. The dry weight resulted to be the best parameter. For each month and station, regressions of the somatic calcareous dry weight of the thallus vs. the somatic calcareous dry weight of the new segments were computed. Based on previous data, yearly production of Halimeda incrassata was estimated at 224.0 g and 140.5 g somatic calcareous dry weight m2 y1 for the Reef- and the Lagoon-station respectively. Variations in growth between sampling months were too large at the Beach-station to deduce yearly production. The contribution of new plants to the production was small, the highest value being 13.3% of total production of the Beach-station in January. Maximum number of new visible thalli was 12 in two weeks. Mean percentage CaCO3 of the total somatic calcareous dry weight was 86.1%. Calcium content of new and old segments was similar at the Reef-station, but at the Lagoon- and Beach-station the percentage of Calcium in new segments was lower than that in the old segments. Percentage of CaCO3 of the thalli did not differ throughout the three months at the Reef-station (86.46%) and Lagoon-station (86.24%), however differences were encountered at the Beach-station in sampling periods. This study also revealed that production results in some other studies were probably overestimated due to the use of other growth parameters. The present work will be used as a pilot study for further analyses of somatic calcareous production of Halimeda incrassata.

Item Type: Thesis (Master's Thesis / Essay)
Degree programme: Biology
Thesis type: Master's Thesis / Essay
Language: English
Date Deposited: 15 Feb 2018 07:44
Last Modified: 15 Feb 2018 07:44

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