scholarly journals Mutualistic relationships in marine angiosperms: Enhanced germination of seeds by mega‐herbivores

Biotropica ◽  
2021 ◽  
Author(s):  
Samantha J. Tol ◽  
Jessie C. Jarvis ◽  
Paul H. York ◽  
Bradley C. Congdon ◽  
Robert G. Coles
Keyword(s):  
Marine Angiosperms

scholarly journals Random amplified polymorphic DNA (RAPD) finger prints evidencing high genetic variability among marine angiosperms of India

2016 ◽  
Vol 97 (6) ◽  
pp. 1307-1315 ◽  
Author(s):  
Elangovan Dilipan ◽  
Jutta Papenbrock ◽  
Thirunavakkarasu Thangaradjou
Keyword(s):  
Genetic Variability ◽  
Rapd Analysis ◽  
Random Amplified Polymorphic Dna ◽  
Rapd Marker ◽  
Seagrass Species ◽  
Complex Species ◽  
Marine Angiosperms ◽  
Different Populations ◽  
High Degree ◽  
Identification Tool

In India 14 seagrass species can be found with monospecific genera (Enhalus, ThalassiaandSyringodium),Cymodoceawith two species andHalophilaandHalodulerepresented by more than two taxonomically complex species. Considering this, the present study was made to understand the level and pattern of genetic variability among these species collected from Tamilnadu coast, India. Random amplified polymorphic DNA (RAPD) analysis was used to evaluate the level of polymorphism existing between the species. Out of the 12 primers tested, 10 primers amplified 415 DNA fragments with an average of 41.5 fragments per primer. Of the total 415 amplified fragments only 123 (29.7%) were monomorphic and the remaining 292 (70.3%) were polymorphic for Indian seagrass species. Among the 10 primers used four are identified as the key primers capable of distinguishing all the Indian seagrasses with a high degree of polymorphism and bringing representative polymorphic alleles in all the tested seagrasses. From the present investigation, this study shows that the RAPD marker technique can be used not only as a tool to analyse genetic diversity but also to resolve the taxonomic uncertainties existing in the Indian seagrasses. The efficiency of these primers in bringing out the genetic polymorphism or homogeneity among different populations of theHalophilaandHalodulecomplex still has to be tested before recommending these primers as an identification tool for Indian seagrasses.

scholarly journals An ecological study of Electra posidoniae Gautier, 1954 (Cheilostomata, Anasca), a bryozoan epiphyte found solely on the seagrass Posidonia oceanica (L.) Delile, 1813

2020 ◽  
Vol 144 (1) ◽  
Author(s):  
Gilles Lepoint ◽  
Olivier Mouchette ◽  
Corine Pelaprat ◽  
Sylvie Gobert
Keyword(s):  
Water Column ◽  
Posidonia Oceanica ◽  
Early Spring ◽  
Food Sources ◽  
Seagrass Ecosystem ◽  
Life Traits ◽  
Colonization Dynamics ◽  
Marine Angiosperms ◽  
The Relationship ◽  
Quantitative Importance

The bryozoan Electra posidoniae Gautier is found solely on the leaves of the Neptune grass Posidonia oceanica (L.) Delile, dominating the leaf epifauna of this seagrass. Epiphytes of marine angiosperms (or seagrasses) often play an important role in ecosystem functioning, for example as food web suppliers. As dysfunction of the epiphytic component is often implied in human-induced seagrass decline, it is important to understand the dynamics and life traits of this community in pristine areas. This study involved the monthly assessment of colonization dynamics, biomass seasonality, and diet composition through measurements of stable isotopes, in E. posidoniae at a depth of 10 m in the Revellata Bay (Corsica, Mediterranean Sea). Ancestrulae (i.e. colony founders) appeared towards the end of winter and were very selective in their settlement position along the leaves of P. oceanica. A maximum of 100,000 colonies per square meter was recorded. Colonies of E. posidoniae dominated the epiphytic community biomass in early spring, but were overtaken by epiphytic algae in June. Food shortage could be involved in this reduction in dominance. Although stable isotope ratios of C, N and S showed that this suspension feeder mainly relies on the water column for its food, other food sources such as re-suspended epiphytic diatoms could be important in late spring (i.e. after the phytoplanktonic bloom). Additionally, a contribution of seagrass phytodetritus to the diet of this species cannot be excluded. The species was almost absent in winter, raising the question of its recruitment in spring. This study confirms the quantitative importance of this species in the seagrass meadow and explores its role in the relationship between the water column and this seagrass ecosystem.

Mating System and Clonal Architecture: A Comparative Study in Two Marine Angiosperms

2005 ◽  
Vol 19 (5) ◽  
pp. 487-499 ◽  
Author(s):  
Maria Valeria Ruggiero ◽  
Stefano Capone ◽  
Patrizia Pirozzi ◽  
Thorsten B. H. Reusch ◽  
Gabriele Procaccini
Keyword(s):  
Comparative Study ◽  
Mating System ◽  
Clonal Architecture ◽  
Marine Angiosperms

The shallow sublittoral marine ecology of Aldabra

1971 ◽  
Vol 260 (836) ◽  
pp. 123-171 ◽  
Keyword(s):  
Marine Algae ◽  
Marine Ecology ◽  
Preliminary Treatment ◽  
Algal Flora ◽  
Direct Wave ◽  
Calm Water ◽  
Marine Angiosperms ◽  
Marine Algal ◽  
Pool Area ◽  
Marine Angiosperm

The paper represents a preliminary treatment of the marine ecology of certain areas of the shallow sublittoral, mostly on West Island, on Aldabra. Seaward reefs on West Island are, for this island group, calm water localities. Detailed examinations of profiles, and additional observations, indicate that ‘ zones ’ can be recognized in the shallow sublittoral, but these ‘zones’ are more a function of the nature and physiography of the substrate and of the presence and density of marine Angiosperm vegetation than of the marine algae. Luxuriant marine algal flora is, on the reef-flat, found only in deep pools or channels landward of the ‘reef-ridge’, most commonly in the inner ridge/pool area. These circumstances seem to provide protection from direct wave action, together with adequate depth of water at all times. Similar conditions apparently apply in the area immediately lagoon ward of Western Channels, where a most luxuriant ‘turf’ of marine algae and marine angiosperms was located. The biomass of marine vegetation there was quite outstanding for Aldabra, representing a cover of virtually 100%, with much additional growth of one species over another throughout most of the `turf’ area.

Release of Glycollate from Tropical Marine Plants

1976 ◽  
Vol 3 (1) ◽  
pp. 57 ◽  
Author(s):  
GE Fogg
Keyword(s):  
Surface Water ◽  
Quantitative Determination ◽  
Oxygen Concentration ◽  
High Oxygen ◽  
Colorimetric Analysis ◽  
High Oxygen Concentration ◽  
Marine Plants ◽  
Coral Sea ◽  
High Illumination ◽  
Marine Angiosperms

Release of glycollate under conditions of high illumination and high oxygen concentration from tropical seaweeds representing the groups Chlorophyta, Phaeophyta and Rhodophyta, and from two marine angiosperms, has been demonstrated. The amount released is increased by the presence of alumina as an adsorbent. Quantitative determination is rendered difficult by the simultaneous release of a substance(s), also adsorbed on alumina, which interferes in the colorimetric analysis for glycollate. The concentration of glycollate in surface water in the Coral Sea was determined on two occasions as 0.015 mg I-1.

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