The relationship between Callitriche L. clones and environmental variables using genotyping

Triest, Ludwig; Mannaert, An

doi:10.1007/s10750-006-0164-6

Cited by 4 publications

(3 citation statements)

References 8 publications

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“…A number of studies suggested low within-population variability due to predominance of clonal growth such as Ceratophyllum L. (Les, 1988;Kaplan & Stephanek, 2003), Zannichellia L. (Triest & Vanhecke, 1991), Potamogeton coloratus Hornem, P. pectinatus L. (also named Stuckenia pectinata (L.) Börner), P. filiformis Pers. (Hollingsworth et al, 1995(Hollingsworth et al, , 1996 and Callitriche obtusangula Le Gall (Triest & Mannaert, 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Callitriche species exhibit considerable variation in chromosome number, ecology, life form and pollination systems (Philbrick, 1993) but identification at species level remains difficult. Various RAPD multilocus genotypes (MLGs) indicate a relationship with environmental variables (Triest & Mannaert, 2006), thereby suggesting differentiation between habitats. Z. palustris s.l.…”

Section: Introductionmentioning

confidence: 99%

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Genetic differentiation of submerged plant populations and taxa between habitats

Triest

Thi

et al. 2010

Hydrobiologia

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Ceratophyllum spp., Callitriche spp., Zannichellia spp. and Potamogeton pectinatus L. are widespread submerged macrophyte species, often occurring at high abundance and forming an integral part of the vegetation of many types of shallow aquatic systems. Several species occur in both freshwater and brackish water habitats. Most have a mixed reproduction system and can reproduce sexually by seeds and propagate asexually by rhizomes, turions, root tubers or axillary tubers. It is hypothesized that sexual propagules are more important than vegetative fragments to ensure long-distancedispersal, which in case of frequent bird or water flow-mediated dispersal should lead to lowered genetic differentiation. At a regional level, we used dominant ISSR markers in a multi-species approach and observed the largest clonal differentiation between brackish water and freshwater populations of the western European lowland (Belgium). Differentiation was pronounced at taxon level (e.g. Zannichellia), as a salinity gradient (P. pectinatus) or as a coastal-to-inland conductivity gradient (Callitriche obtusangula). These differences and trends suggested a very limited dispersal at regional level across both habitats and regions. To test the hypothesis whether vegetative reproduction and dispersal may have an important function in maintenance of the species at local scale, we investigated the microsatellite diversity and clonal distribution within and between populations of P. pectinatus from a single catchment, representing upstream forest ponds and downstream river sites along the Woluwe (Brussels, Belgium). Clonal diversity was low on average, however, with a higher number of multilocus genotypes in upstream forest ponds than in downstream river sites. A few but abundant clones were present along various stretches of the river indicating clonal spread and establishment over larger distances within the river. Clonal dispersal at a local scale was more pronounced in river than in pond habitats, indicating a higher relative importance of water flow than birdmediated dispersal for establishment of P. pectinatus in river sites. Dispersal of seeds and establishment of seedlings were assumed more effective within ponds than in river habitats. Upstream forest ponds can be regarded as source populations and refuges of clonal diversity for recolonization of the more stressful downstream river habitat.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Genetic differentiation of submerged plant populations and taxa between habitats

Triest

Thi

et al. 2010

Hydrobiologia

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“…Not much is known about the relationship between pond habitat characteristics and macrophyte gene diversity of but, e.g. in the context of a river system, a non-random distribution of Callitriche L. clones was observed in relation to alkalinity (Triest & Mannaert, 2006). Single ponds within a lagoon system can show different physical properties, salinities, inundation periods, sediment oxygenation, etc.…”

Section: Discussionmentioning

confidence: 99%

High diversity of Ruppia meadows in saline ponds and lakes of the western Mediterranean

Triest

Sierens

2009

Hydrobiologia

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Saline inland and coastal waterbodies are valuable habitats that deserve attention for the protection of their unique submerged macrophyte beds that render the water clear, stabilize sediments and provide a habitat for high biomasses of invertebrates as food for waterfowl. The 'continental seagrass' Ruppia has the widest salinity tolerance among the submerged macrophytes and occurs in a wide variety of saline saltmarsh pond and lagoon systems. Although two cosmopolitan species Ruppia maritima and Ruppia cirrhosa are recognized in Europe and Ruppia drepanensis in the western Mediterranean, their diversity and distribution are not well known. This previously held traditional idea that there are only two widespread Ruppia species suggests a uniform and very homogenized population structure following the hypothesis of long-distancedispersal through strong bird-mediated dispersal events. Therefore, the Ruppia chloroplast DNA diversity was investigated along a more than 1,000 km transect of the Iberian Peninsula. We studied 492 individuals from 11 wetland areas (17 ponds) and sequenced a 1,753-bp length of seven chloroplast introns. Eight haplotypes represented at least four distinct groups or taxa which is higher than commonly accepted. Six wetland areas contained more than one haplotype and within-pond diversity occurred within distances as small as 30 m (5 out of 17 cases). This underlines the importance of single waterbodies for harbouring haplotypic diversity in Ruppia. Unique haplotypes were observed in four wetland areas and R. maritima was detected only from a low salinity pond, suggesting the species might be more rare than previously accepted. The present results tend to minimize an overall effect of strong bird-mediated dispersal. This emphasizes the role of regional pond habitat diversity for the preservation of Ruppia taxa and their unique haplotype diversity in extreme saline habitats.

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High diversity of Ruppia meadows in saline ponds and lakes of the western Mediterranean

Triest¹,

Sierens²

2009

Pond Conservation in Europe

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The relationship between Callitriche L. clones and environmental variables using genotyping

Cited by 4 publications

References 8 publications

Genetic differentiation of submerged plant populations and taxa between habitats

Genetic differentiation of submerged plant populations and taxa between habitats

High diversity of Ruppia meadows in saline ponds and lakes of the western Mediterranean

High diversity of Ruppia meadows in saline ponds and lakes of the western Mediterranean

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