Propagule bank and plant emergence of macrophytes in artificial channels of a temperate irrigation area in Argentina

Growth and Reproduction of Ruppia maritima in the Northern Gulf of Mexico

“…The sediment seed densities in this study, when converted to seeds/m 2 , are generally similar to or higher than those observed for R. maritima in other studies (McMillan, 1985;Bonis et al, 1995;Acosta et al, 1999;Rodríguez-Pérez and Green, 2006;Porter et al, 2007), though only the study by Acosta et al used the same sampling methodology, so direct comparisons should be made with caution.…”

Influence of salinity and sediment resuspension on macrophyte germination in coastal lakes

“…Oospores of Chara contraria collected from plants showed a germination rate of 44-85% while those collected from sediment exhibited a lower germination rate of 30-50% both germinated at 21 °C (Sabbatini 1987). Acosta et al (1999) found similar high germination rates of 24% for sedimentary oospores of Chara contraria at an unknown temperature. A maximum germination rate for Chara contraria of 36.6% was found by Acosta et al (1998) in the optimum range of 24-27 °C, indicating that this species require higher then the mean spring temperature of 15 °C simulated in our experiments for optimal recolonisation.…”

Ruppia maritima L. seed bank viability at the Everglades-Florida Bay ecotone

“…The seed densities found in our survey were consistent, however, with low seed densities reported for R. maritima growing in permanent and temporary arid zone wetlands in Australia (0-38 m −2 ; Porter et al, 2007). Even more importantly, the densities of viable R. maritima seeds found across the ecotone (0-160 m −2 ; average 39 m −2 ) were extremely low compared to populations in other coastal environments in British Columbia and Argentina (53-1151 m −2 , Bigley, 1981;Acosta et al, 1999) and another species of the same genus (Ruppia spiralis) from the Baltic Sea coast (60-832 m −2 , Kautsky, 1990).…”

“…Across the ecotone (28 sites along 6 transects), the number of total seeds ranged from 150 to 1783 m −2 . These seed densities are low compared to those which are known to support robust R. maritima populations worldwide (3000 to 5000 m −2 ), based on populations in Laguna Madre, Texas, Mediterranean marshes, and Argentinean wetlands (McMillan, 1985;Bonis et al, 1995;Acosta et al, 1999). The seed densities found in our survey were consistent, however, with low seed densities reported for R. maritima growing in permanent and temporary arid zone wetlands in Australia (0-38 m −2 ; Porter et al, 2007).…”