+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

The functional morphology of turf forming seaweeds persistence in stressful marine habitats

, : The functional morphology of turf forming seaweeds persistence in stressful marine habitats. Ecology (Washington D C) 62(3): 739-750

Many seaweeds that occur in physically stressful habitats or habitats subject to moderate herbivory grow as colonial turfs rather than as spatially separated individuals. The turf growth form is energetically expensive (the net production per gram ash free dry mass of turfs being 33-61% lower than that of individuals), but turfs suffer less physiological damage during desiccating low tides and lose less biomass to herbivores. The upper portions of turf-forming species show significantly greater rates of apparent photosynthesis and dark respiration than do the lower portions. This spatial partitioning of photosynthetic activity decreases the energetic cost of the turf arrangement and may allow basal portions to function as persistent resting stages during periods of adverse conditions when uprights cannot be maintained. Turf-forming species are specialized for areas that are subject to moderate grazing pressure and physical stresses. They are dependent upon these factors to prevent their competitive exclusion by more productive, but less resistant, seaweeds. Damage to apical portions causes increased branching that results in a more tightly compacted turf. Algae that regenerate in this way can adjust their growth form in accordance with varying levels of disturbance encountered in different habitats and thus incur the minimal cost consistent with survival in that area. For seaweeds occurring in stressful habitats, selection has favored characteristics that increase persistence in space and time even though these involve considerable losses in competitive ability and productivity.

Accession: 006680679

Submit PDF Full Text: Here

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Related references

M Martins, G.; Hipólito, Cáudia.; Parreira, F.; C L Prestes, A.; Dionísio, M.A.; N Azevedo, Jé.M.; Neto, A.I., 2016: Differences in the structure and functioning of two communities: Frondose and turf-forming macroalgal dominated habitats. In many coastal regions, vegetated habitats (e.g. kelps forests, seagrass beds) play a key role in the structure and functioning of shallow subtidal reef ecosystems, by modifying local environmental conditions and by providing food and habitat for...

Piazzi, L.; Cinelli, F., 2001: Distribution and dominance of two introduced turf-forming macroalgae on the coast of Tuscany, Italy, northwestern Mediterranean Sea in relation to different habitats and sedimentation. The occurrence of filamentous turf-forming macroalgae assemblages has been widely reported in tropical and temperate oceans. In the Mediterranean Sea the development of dense and persistent turfs has recently started and has been linked to the spr...

Taylor, P.R.; Hay, M.E., 1984: Functional morphology of intertidal seaweeds adaptive significance of aggregate vs. solitary forms. Many intertidal seaweeds [Corallina vancouveriensis, Lithothrix aspergillum, Gelidium coulteri, Rhodoglossum affine] show a tremendous gradient of morphological form ranging from spatially separated thalli, to thalli that are aggregated into dense...

Atalah, J.; Hopkins, G.A.; Forrest, B.M., 2014: Augmentative biocontrol in natural marine habitats: persistence, spread and non-target effects of the sea urchin Evechinus chloroticus. Augmentative biocontrol aims to control established pest populations through enhancement of their indigenous enemies. To our knowledge, this approach has not been applied at an operational scale in natural marine habitats, in part because of the p...

Diaz, J., M.; Sanchez, J., A.; Zea, S.; Garzon-Ferreira, J., 1996: Morphology and marine habitats of two southwestern Caribbean atolls: Albuquerque and Courtown. Albuquerque and Courtown are two small, uninhabited oceanic atolls, located in the southwestern Caribbean Sea, belonging to the San Andres and Providencia archipelago, Colombia. These atolls have a volcanic basement and are surrounded by deep wate...

Kim, Jeong Ha, 2002: Mechanisms of competition between canopy-forming and turf-forming intertidal algae. Mechanisms of competition between two canopy algae and an understory alga were investigated by a field manipulative experiment using artificial thalli. The study was carried out in the upper intertidal zone at Nudibranch Point in Vancouver Island,...

Kemp, J.L.; Harper, D.M.; Crosa, G.A., 1999: Use of 'functional habitats' to link ecology with morphology and hydrology in river rehabilitation. 1. This paper examines the influence of channel morphology and hydraulics on the occurrence and diversity of 'functional habitats' (also called 'meso-habitats') in semi-natural and physically degraded rivers. 2. The depths and...

Sinha, S.K.; Sinha, R.K.; Nath, S., 1991: A comparative study of the morphology and anatomy of the olfactory organs of two marine fishes with different habitats--Trichiuris savala (Cuv. et Val.) and Tetrodon leopardus (Russel). The authors carried out a comparative study of olfaction in two marine fishes. The olfactory organs of Trichiuris savala (a middepth feeder) were found to be well developed and capable of detecting smells, whereas in Tetrodon leopardus, which is a...

Sinha, SK.; Sinha, RK.; Nath, S., 1991: A comparative study of the morphology and anatomy of the olfactory organs of two marine fishes with different habitats - Trichuris savala Cuv et Val and Tetrodon leopardus Russel. Functional and Developmental Morphology, 11: 73-76

Larcher W.; Vareschi V., 1988: Variation of morphology and functional traits of dictyonema glabratum from contrasting habitats in the venezuelan andes. Specimens of Dictyonema glabratum from various elevations in the Venezuelan Andes show clear differences in morphology. Optimal development of thalli is attained in the lower Paramo at 3500-3600 m; at the upper altitudinal limit of distribution at...