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Seagrass die-off in Florida Bay (USA): changes in shoot demographic characteristics and population dynamics in Thalassia testudinum Durako, M.J. (1994). Seagrass die-off in Florida Bay (USA): changes in shoot demographic characteristics and population dynamics in Thalassia testudinum. Mar. Ecol. Prog. Ser. 110(1): 59-66. https://dx.doi.org/10.3354/meps110059 In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, meer

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Trefwoorden

Biological stress Biology > Organism morphology > Plant morphology Flora > Weeds > Marine organisms > Seaweeds > Sea grass Population dynamics Population functions > Mortality > Total mortality Population functions > Recruitment Thalassia testudinum K.D.Koenig, 1805 [WoRMS] Marien/Kust

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Auteur		Top
Durako, M.J.

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Abstract

Population dynamics, including demographic characteristics, of short-shoots of Thalassia testudinum were evaluated within 3 Florida Bay (USA) basins experiencing differing severities of sea-grass die-off. Annual mean plastochrone intervals (PI) ranged from 14.1 to 20.6 d, and they increased from the basin experiencing the most prolonged and extensive die-off to the basin least affected by die-off. PIs calculated by leaf punching were always shorter than those estimated by cohort analyses. In all 3 basins, overall population age structure changed significantly between April 1989 and April 1990; population half-life, mean shoot age, the age of the oldest shoot, and shoot density declined, whereas rhizome apical density increased. An examination of the population dynamics of the 3 T. testudinum populations revealed that both recruitment and mortality of short-shoots increased between April 1989 and April 1990, but the increase in mortality was proportionately greater. These changes indicated that the T. testudinum populations in Florida Bay were continuing to decline and that the declines corresponded to the increased extent and severity of short-shoot die-off.

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