Browsing by Author "Terrados, J."
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- Genetic recolonization of mangrove: Genetic diversity still increasing in the Mekong delta 30 years after Agent OrangePublication . ARNAUD-HAOND, Sophie; Duarte, C. M.; Teixeira, Sara; Massa, S. I.; Terrados, J.; Tri, N. H.; Hong, P. N.; Serrão, EsterThe widespread use of Agent Orange (a mixture of phenoxyl herbicides) over Southern Vietnam by US Forces led to the decimation of mangrove forests in the Mekong Delta. Mangrove trees Avicennia alba were sampled across the Mekong Delta; their age was assessed using models based on internode growth and samples were genotyped for 6 microsatellite loci. The evolution of genetic diversity over time elapsed since local extinction was reconstructed and compared with the genetic diversity of an unaffected population from Thailand. The results show that genetic diversity of the A. alba population is still increasing in the Mekong Delta 3 decades after the end of the Vietnam War, but is reaching an asymptotic level that is comparable to the adjacent non-affected population of Thailand. This might be a sign of genetic recovery, but may also reveal a limitation, either of genetic enrichment due to current predominance of auto-recruitment or of demographic increase due to intraspecific competition in this pioneer species. In any case, these results, although encouraging, demonstrate that genetic recovery after complete or almost complete population depletion continues over a longer time-scale than apparent demographic recovery.
- Reproductive biology of pipefish Syngnathus typhle and S. abaster (Syngnathidae) from Western Mediterranean SeaPublication . Simal Rodríguez, A.; Grau, A.; Castro-Fernández, J.; Castejón, I.; Terrados, J.; Morales-Nin, B.; Arechavala-Lopez, P.The reproductive biology of two species of pipefish, Syngnathus typhle and S. abaster, was investigated in western Mediterranean coastal waters, through determination of sex-ratio and maturity state, and histological assessment of gonads, brood pouch and embryos of these little-known syngnathid species. A total of 22 S. typhle and 13 S. abaster individuals were collected by towing-net on shallow seagrass meadows (Posidonia oceanica and Cymodocea nodosa) at Balearic Islands (Spain). Overall sex-ratio (male : female) was 1.0 : 1.2 for S. typhle and 1.0 : 2.7 for S. abaster. Regarding maturity, all stages of females were sampled while only immature or brooding males were collected. Males with embryos in the pouch were found in summer for both species, and mature females of S. typhle were found in summer whereas mature females of S. abaster were found in winter and summer, suggesting that each species might have a different reproductive cycle. This study contributes to the knowledge on the reproductive biology of the two most abundant pipefish species in W-Mediterranean coastal waters, which might help for further restocking and conservation management strategie.