Ruppia

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Lawrence P. Rozas - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Nonnative Eurasian Watermilfoil, Myriophyllum spicatum, on Nekton Habitat Quality in a Louisiana Oligohaline Estuary
    Estuaries and Coasts, 2019
    Co-Authors: Scott B. Alford, Lawrence P. Rozas
    Abstract:

    Submerged aquatic vegetation (SAV) provides critical habitat for estuarine nekton in the Gulf of Mexico, but habitat quality of SAV beds may change when nonnative species, such as Eurasian watermilfoil ( Myriophyllum spicatum ), become established. We compared the habitat value of Myriophyllum with another common native SAV ( Ruppia maritima ) by using field collections to document shifts in nekton community structure and a field experiment to compare growth rates of commercially important juvenile white shrimp ( Litopenaeus setiferus ). Similar communities were collected from both SAV species, though nekton abundance scaled with SAV biomass. The habitat quality provided by Myriophyllum for white shrimp appeared to meet or exceed that of Ruppia , with densities and growth rates of shrimp in Myriophyllum (2.2 ± 0.47 m^−2, 1.0 ± 0.07 mm TL day^−1, 25.7 ± 2.98 mg day^−1) higher than in Ruppia (1.0 ± 0.36 m^−2, 0.6 ± 0.09 mm TL day^−1, 11.6 ± 2.04 mg day^−1). Though differences were detected between SAV species, other factors, such as hypoxia and interspecific competition, likely contributed to the differences we documented between these habitat types in shrimp densities and growth. Our study provides an example of a nonnative habitat-forming species providing a viable alternative to native habitat. This result contradicts the paradigm of negative effects associated with nonnative species following their introduction into an ecosystem.

  • Effects of Nonnative Eurasian Watermilfoil, Myriophyllum spicatum, on Nekton Habitat Quality in a Louisiana Oligohaline Estuary
    Estuaries and Coasts, 2019
    Co-Authors: Scott B. Alford, Lawrence P. Rozas
    Abstract:

    Submerged aquatic vegetation (SAV) provides critical habitat for estuarine nekton in the Gulf of Mexico, but habitat quality of SAV beds may change when nonnative species, such as Eurasian watermilfoil ( Myriophyllum spicatum ), become established. We compared the habitat value of Myriophyllum with another common native SAV ( Ruppia maritima ) by using field collections to document shifts in nekton community structure and a field experiment to compare growth rates of commercially important juvenile white shrimp ( Litopenaeus setiferus ). Similar communities were collected from both SAV species, though nekton abundance scaled with SAV biomass. The habitat quality provided by Myriophyllum for white shrimp appeared to meet or exceed that of Ruppia , with densities and growth rates of shrimp in Myriophyllum (2.2 ± 0.47 m^−2, 1.0 ± 0.07 mm TL day^−1, 25.7 ± 2.98 mg day^−1) higher than in Ruppia (1.0 ± 0.36 m^−2, 0.6 ± 0.09 mm TL day^−1, 11.6 ± 2.04 mg day^−1). Though differences were detected between SAV species, other factors, such as hypoxia and interspecific competition, likely contributed to the differences we documented between these habitat types in shrimp densities and growth. Our study provides an example of a nonnative habitat-forming species providing a viable alternative to native habitat. This result contradicts the paradigm of negative effects associated with nonnative species following their introduction into an ecosystem.

Ludwig Triest - One of the best experts on this subject based on the ideXlab platform.

  • Hidden Hybridization and Habitat Differentiation in a Mediterranean Macrophyte, the Euryhaline Genus Ruppia
    Frontiers in plant science, 2020
    Co-Authors: Lise Beirinckx, Bram Vanschoenwinkel, Ludwig Triest
    Abstract:

    In many aquatic plant taxa, classification and identification based on morphology has always been difficult. Molecular markers revealed that the complexity in several of these aquatic taxa could be addressed to recurrent hybridization events and cryptic species diversity. The submerged macrophyte genus Ruppia is one of these aquatic genera with a complex taxonomy due to the absence of clear distinguishable traits and several hybridization events. Two species co-exist throughout Europe, R. maritima and R. spiralis (previously known as R. cirrhosa), but recent molecular studies also found several indications of hybridization, introgression and chloroplast capture between these species. However, the full extent and frequency of hybridization and introgression in this genus has not been studied so far, nor is it clear how these hybrid lineages can co-exist locally with their parental species. In this paper, we wanted to detect whether a single coastal wetland where both species co-exist can act as a Ruppia hybrid zone. As a case study, we chose the Camargue, a Mediterranean coastal wetland that harbours a wide diversity in aquatic habitats, especially in terms of salinity and hydro regime. We sampled several Ruppia populations within this wetland. We used both chloroplast and nuclear microsatellite markers to identify each sample and reconstruct the local genetic structure of the two parental species and their hybrids. Afterwards, we tested whether different species had different habitat preferences. Our results confirmed that R. maritima and R. spiralis are two strongly divergent species with different reproductive ecologies and different habitat preferences. This prevents frequent hybridization and consequently we could not detect any trace of a recent hybridization event. However, we found several populations of later-generation hybrids, including a population of R. maritima x hybrid backcrosses. These hybrid populations occupy a different habitat and are genetically distinct from their parental species, although they tend to be morphological similar to parental R. maritima. Although hybridization and introgression in Ruppia is less frequent than we expected, the taxonomy of Ruppia is complicated due to ancient hybridizations and several back-crossings.

  • A profound view and discourse on the typification and status of three confused taxa: Ruppia maritima, R. spiralis and R. cirrhosa
    Botanica Marina, 2020
    Co-Authors: Cornelis Den Hartog, Ludwig Triest
    Abstract:

    AbstractTaxonomic difficulties have persisted within the genus Ruppia for a long time. We first unravel misconceptions as perceived on different continents and subsequently present a revised interpretation of the identity and typification of three European taxa at species level: Ruppia maritima L., Ruppia spiralis L. ex Dumortier, and Ruppia cirrhosa (Petagna) Grande. To do this, historical specimens, illustrations and original descriptions were studied. We supersede a previous choice of the figure of Buccaferrea maritima, foliis minus acutis Micheli (1729) as the lectotype of R. maritima and type species of the genus Ruppia owing to a serious conflict with the protologue. Based on a meticulous interpretation of protologues and figures in a historical context, we reject the recent view of assigning R. cirrhosa and its proposed lectotype (iconotype) as a homotypic synonym of R. maritima. We agree with an earlier lectotypification of R. spiralis, though for another reason than the above-mentioned abused homotypy. Consequently, R. cirrhosa is a synonym of neither R. maritima or R. spiralis, based on material from Petagna in the Herbarium of Naples designated as the holotype of R. cirrhosa. We argue for three species to be considered as fully independent taxa: R. maritima, R. spiralis and R. cirrhosa.

  • The genus Ruppia L. (Ruppiaceae) in the Mediterranean region: An overview
    Aquatic Botany, 2015
    Co-Authors: Anna Maria Mannino, Margarita Menéndez, Biel Obrador, Adriano Sfriso, Ludwig Triest
    Abstract:

    Abstract This paper reviews the current knowledge on the diversity, distribution and ecology of the genus Ruppia L. in the Mediterranean region. The genus Ruppia, a cosmopolitan aquatic plant complex, is generally restricted to shallow waters such as coastal lagoons and brackish habitats characterized by fine sediments and high salinity fluctuations. In these habitats Ruppia meadows play an important structural and functional role. Molecular analyses revealed the presence of 16 haplotypes in the Mediterranean region, one corresponding to Ruppia maritima L., and the others to various morphological forms of Ruppia cirrhosa (Petagna) Grande, all together referred to as the “R. cirrhosa s.l. complex”, which also includes Ruppia drepanensis Tineo. Populations of hybrid origin between R. maritima and R. cirrhosa and polyploidy have been detected.

  • Data collection and haplotype diversity.
    2014
    Co-Authors: Ludwig Triest, Tim Sierens
    Abstract:

    Collection details and diversity in 12 European and Mediterranean regions of 2221 Ruppia cirrhosa individuals from 106 coastal lagoons and inland saline waterbodies. Additional locality details, haplotypes, ITS identity and ploidy levels of 2843 individuals of both Ruppia cirrhosa and Ruppia maritima complex are given in Table S1.

  • Maximum Likelihood Tree of 25 haplotypes.
    2014
    Co-Authors: Ludwig Triest, Tim Sierens
    Abstract:

    Two haplogroup complexes of Ruppia cirrhosa and of Ruppia maritima are fully supported. Within haplogroups, only support (>70) was given to haplotypes D and E. The basal lineages of each haplogroup contain populations of Africa. The Ruppia cirrhosa complex with haplogroups B and C represent tetraploid populations (ITS-B) from the most marine-lagoonal habitats whereas others haplogroups (A, D) contained diploid populations (ITS-A and ITS-C) mostly from brackish water and inland saline wetlands, including ephemeral habitats.

Scott B. Alford - One of the best experts on this subject based on the ideXlab platform.

  • Effects of Nonnative Eurasian Watermilfoil, Myriophyllum spicatum, on Nekton Habitat Quality in a Louisiana Oligohaline Estuary
    Estuaries and Coasts, 2019
    Co-Authors: Scott B. Alford, Lawrence P. Rozas
    Abstract:

    Submerged aquatic vegetation (SAV) provides critical habitat for estuarine nekton in the Gulf of Mexico, but habitat quality of SAV beds may change when nonnative species, such as Eurasian watermilfoil ( Myriophyllum spicatum ), become established. We compared the habitat value of Myriophyllum with another common native SAV ( Ruppia maritima ) by using field collections to document shifts in nekton community structure and a field experiment to compare growth rates of commercially important juvenile white shrimp ( Litopenaeus setiferus ). Similar communities were collected from both SAV species, though nekton abundance scaled with SAV biomass. The habitat quality provided by Myriophyllum for white shrimp appeared to meet or exceed that of Ruppia , with densities and growth rates of shrimp in Myriophyllum (2.2 ± 0.47 m^−2, 1.0 ± 0.07 mm TL day^−1, 25.7 ± 2.98 mg day^−1) higher than in Ruppia (1.0 ± 0.36 m^−2, 0.6 ± 0.09 mm TL day^−1, 11.6 ± 2.04 mg day^−1). Though differences were detected between SAV species, other factors, such as hypoxia and interspecific competition, likely contributed to the differences we documented between these habitat types in shrimp densities and growth. Our study provides an example of a nonnative habitat-forming species providing a viable alternative to native habitat. This result contradicts the paradigm of negative effects associated with nonnative species following their introduction into an ecosystem.

  • Effects of Nonnative Eurasian Watermilfoil, Myriophyllum spicatum, on Nekton Habitat Quality in a Louisiana Oligohaline Estuary
    Estuaries and Coasts, 2019
    Co-Authors: Scott B. Alford, Lawrence P. Rozas
    Abstract:

    Submerged aquatic vegetation (SAV) provides critical habitat for estuarine nekton in the Gulf of Mexico, but habitat quality of SAV beds may change when nonnative species, such as Eurasian watermilfoil ( Myriophyllum spicatum ), become established. We compared the habitat value of Myriophyllum with another common native SAV ( Ruppia maritima ) by using field collections to document shifts in nekton community structure and a field experiment to compare growth rates of commercially important juvenile white shrimp ( Litopenaeus setiferus ). Similar communities were collected from both SAV species, though nekton abundance scaled with SAV biomass. The habitat quality provided by Myriophyllum for white shrimp appeared to meet or exceed that of Ruppia , with densities and growth rates of shrimp in Myriophyllum (2.2 ± 0.47 m^−2, 1.0 ± 0.07 mm TL day^−1, 25.7 ± 2.98 mg day^−1) higher than in Ruppia (1.0 ± 0.36 m^−2, 0.6 ± 0.09 mm TL day^−1, 11.6 ± 2.04 mg day^−1). Though differences were detected between SAV species, other factors, such as hypoxia and interspecific competition, likely contributed to the differences we documented between these habitat types in shrimp densities and growth. Our study provides an example of a nonnative habitat-forming species providing a viable alternative to native habitat. This result contradicts the paradigm of negative effects associated with nonnative species following their introduction into an ecosystem.

Kai Jiang - One of the best experts on this subject based on the ideXlab platform.

Miaomiao Shi - One of the best experts on this subject based on the ideXlab platform.

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