نتایج جستجو برای: porites compressa

تعداد نتایج: 848  

Journal: :Agriculture 2022

Fusarium wilt caused by oxysporum f. sp. lycopersici (FOL) in tomatoes is globally recognized as one of the most significant tomato diseases, both fields and greenhouses. Macroalgae contain a diversity bioactive complexes. This research was carried out to assess value extracts from three macroalgae (Sargassum dentifolium belongs Phaeophyta, Gracilaria compressa Rhodophyta, Ulva lactuca Chloroph...

2003

Previous work has shown that distinct Ca gradients precede and predict the loci of germination of the zygotes of the brown alga, Silvetia compressa (J. Agardh) E. Serrão, T.O. Cho, S.M. Boo et Brawley, that are polarized by unilateral blue light. We show here that dark-grown S. compressa zygotes also form cytosolic Ca gradients prior to germination and then germinate from the site of elevated C...

2002
Bernhard Riegl

Biogeological dynamics consist of a combination of community-ecological responses based on individual-species physiological tolerance limits to a dominant environmental stressor and their consequences on carbonate sedimentological properties. This interplay was investigated in coral carpet systems (biostromal coral frameworks) in the southern Arabian Gulf in Abu Dhabi and Dubai (UAE). Five cora...

2003
Karen E. Joyce Stuart R. Phinn

Few studies have assessed the biophysical properties controlling reflection and absorption of light in coral reef environments and their relationships with quantitative measures of reef health and productivity. The present article examines the relationship between spectral reflectance, photosynthetic capacity, and chlorophyll a from common coral reef substrates. Reflectance readings of several ...

2008
Michelle J. Paddack

Live scleractinian corals are a prime microhabitat for many recruiting coral reef fishes, yet live coral cover has exhibited widespread declines, and the impact of this loss on recruiting fishes is not well understood. Although reduced recruitment rates of parrotfishes (Scaridae) have been observed after loss of coral cover, increased juvenile parrotfish abundance observed in connection with in...

Journal: :Proceedings. Biological sciences 2007
Anuschka Faucci Robert J Toonen Michael G Hadfield

While the role of host preference in ecological speciation has been investigated extensively in terrestrial systems, very little is known in marine environments. Host preference combined with mate choice on the preferred host can lead to population subdivision and adaptation leading to host shifts. We use a phylogenetic approach based on two mitochondrial genetic markers to disentangle the taxo...

2010
Michèle LaVigne Kathryn A. Matthews Andréa G. Grottoli Kim M. Cobb Eleni Anagnostou Guy Cabioch Robert M. Sherrell

A geochemical proxy for surface ocean nutrient concentrations recorded in coral skeleton could provide new insight into the connections between sub-seasonal to centennial scale nutrient dynamics, ocean physics, and primary production in the past. Previous work showed that coralline P/Ca, a novel seawater phosphate proxy, varies synchronously with annual upwelling-driven cycles in surface water ...

2015
Zac Forsman Gerrard M. Wellington George E. Fox Robert J. Toonen

Morphological variation in the geographically widespread coral Porites lobata can make it difficult to distinguish from other massive congeneric species. This morphological variation could be attributed to geographic variability, phenotypic plasticity, or a combination of such factors. We examined genetic and microscopic morphological variability in P. lobata samples from the Galápagos, Easter ...

2014
Robert S. Steneck Suzanne N. Arnold Peter J. Mumby

Dominance shifts in ecosystems can occur rapidly, resulting in alternative stable states. While some coral reef ecosystems shift and recover relatively quickly, others recover slowly or not at all over periods of centuries. We explore the role of large (fishing-susceptible) parrotfish in triggering algal phase shifts as alternative attractors that may lock reefs into coral-depleted alternative ...

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