MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsTheme Sections 356:163-173 (2008) - DOI: https://doi.org/10.3354/meps07316 Experimental assessment and modeling evaluation of effects seagrass Posidonia oceanica on flow particle trapping Iris E. Hendriks1,*, Tomas Sintes2, Tjeerd J. Bouma3, Carlos M. Duarte1 1Instituto Mediterraneo de Estudios Avanzados, IMEDEA (CSIC-UIB),...

The maximum size and age that clonal organisms can reach remains poorly known, although we do know the largest natural clones extend over hundreds or thousands of metres potentially live for centuries. We made a review findings to date, which reveal clone estimates reported in literature are typically limited by scale sampling, may grossly underestimate organisms. A case study presented here shows occurrence slow-growing marine angiosperm Posidonia oceanica at spatial scales ranging from...

Summary Seagrass meadows are important carbon sinks, and they experiencing a global decline. Restoration of seagrass provides strategy to mitigate climate change while conserving these ecosystems. We examined the long‐term sequestration expected for restoration programmes by developing model that combined models patch growth, survival in planting projects estimates CO 2 per unit area five species commonly used programmes. The results indicated cumulative C sequestered increased rapidly over...

Short-scale interactions yield large-scale vegetation patterns that, in turn, shape ecosystem function across landscapes. Fairy circles, which are circular patches bare of within otherwise continuous landscapes, characteristic features semiarid grasslands. We report the occurrence submarine fairy circle seascapes seagrass meadows and propose a simple model that reproduces diversity observed these ecosystems as emerging from plant meadow. These include two extreme cases, meadow landscape,...

The development of single clones the seagrass Cymodocea nodosa was analysed using a growth model based on formation structures limited by diffusive aggregation. implemented measured clonal rules (i.e. rhizome elongation and branching rates, angle, spacer length between consecutive shoots) shoot mortality rate for C. at Alfacs Bay (Spain). simulated patches increased their size nonlinearly with time displaying two different domains growth. Young showed rapid increase network number living...

Seagrasses provide multiple ecosystem services and act as intense carbon sinks in coastal regions around the globe but are threatened by anthropogenic pressures, leading to enhanced seagrass mortality that reflects spatial self-organization of meadows. Spontaneous vegetation patterns appear such different ecosystems drylands, peatlands, salt marshes, or meadows, mechanisms behind this phenomenon still an open question many cases. Here, we report on formation traveling pulses creating complex...

We investigated the problem of adsorption a single semiflexible polymer chain on to planar, homogeneous surface using off-lattice Monte Carlo simulations. Adsorption characteristics were studied at different temperatures for chains various stiffnesses. have found that stiffer adsorb more onto and transition takes place higher temperature when compared flexible chains. As stiffness increases, is be sharper. The computed persistence length grow linearly small values bending energy, while...

Aggregation kinetics and cluster-size distributions are studied with off-lattice, diffusion-limited cluster-cluster simulations. With increased cluster crowding (occurring at late times) as measured by the normalized free volume, $\ensuremath{\Omega}$, both speeds up size distribution broadens. The exponents characterizing each, $z$ $\ensuremath{\lambda}$, respectively, found to be universal functions of $\ensuremath{\Omega}$. Moreover, relation...

Extensive two-dimensional Langevin dynamics simulations are used to determine the effect of steady shear flows on crystal nucleation kinetics charge stabilized colloids and whose pair potential possess an attractive shallow well a few k_{B}T 's (attractive colloids). Results show that in both types systems small amounts speeds up crystallization process enhances quality growing significantly. Moderate rates, other hand, destroy ordering system. The very high rate regime where reentering...

We study the equilibrium morphologies of a single supramolecular magnetic filament in three-dimensional system as function effective strength dipolar interactions. The is performed by means Langevin dynamics simulations with bead-spring chain model freely rotating dipoles. demonstrate existence three structural regimes value coupling parameter increased: coil compaction regime, expansion regime and closed which structures tend progressively to an ideal ring configuration. discuss governing...

The equilibrium conformations of a flexible permanent magnetic filament that consists sequence linked colloidal nanoparticles with short-ranged Lennard-Jones attractive interactions (Stockmayer polymer) are thoroughly analysed via Langevin dynamics simulations. A tentative phase diagram is presented for chain length N = 100. exhibits several unusual conformational phases when compared to non-magnetic chains. These characterised by large degree anisotropy, and consist closed chains,...

The equilibrium structure of supramolecular magnetic filament brushes is analyzed at two different scales. First, we study the density and height distributions for with various grafting densities chain lengths. We use Langevin dynamics simulations a bead–spring model that takes into account cross-links between surface ferromagnetic particles, whose magnetization characterized by point dipole. Magnetic are shown to be more compact near substrate than nonmagnetic ones, bimodal distribution...

We theoretically show how the crosslinking mechanism of colloids can drastically change magnetic response supramolecular filaments.

The Mediterranean Sea is warming more rapidly than the global average, leading to dire consequences for its inhabiting organisms. Seagrasses are key structural elements in coastal ecosystems, and studying how temperature affects these species crucial anticipate implications of warming. In this work, we use an empirically based numerical model study combined dynamics Posidonia oceanica Cymodocea nodosa their resilience sea parametrised using seagrass growth rates measured Western Sea. Under...

We present results from a detailed numerical study of the kinetics phase transformations in model two-dimensional depletion-driven colloidal system. Transition single, dispersed to two-phase coexistence monomers and clusters is obtained as depth interaction potential among particles changed. Increasing well further, fractal are observed simulation. These have hybrid structure sense that they show hexagonal closed-packed crystalline ordering at short length scales ramified nature larger...

We present results from extensive Monte Carlo simulations of flexible and semiflexible excluded-volume polymer chains confined to impenetrable spherical surfaces. Our are compared with the theoretical predictions for ideal by Mondescu Muthukumar (MM) (Phys. Rev. E 1998, 57, 4411) Spakowitz Wang (SW) Lett. 2003, 91, 166102), respectively. The SW prediction is found be in better agreement our simulation than MM all cases studied. Conformation length L persistence lp restricted move on a sphere...

We study the self-assembly of colloidal magnetic particles permanently cross-linked into polymer-like structures with different topologies, that we call supracolloidal polymers (SMPs). In order to understand influence interparticle permanent links, investigate SMPs holding main topologies observed in non-cross-linked via grand canonical Monte Carlo simulations: chains, rings and simple branched structures. Here, using molecular dynamics simulations, focus on systems SMP pairs. Our results...

The presence of an external magnetic field enables the existence bistable and multi-stable regions in phase diagram filaments.

We present the results of extensive three-dimensional off-lattice Monte Carlo simulations two interacting spherical brushes. have measured force in systems where curvature effects are important. Our support a description profile divided into regimes. At short separating distances between brushes is well described by theory Witten and Pincus, whereas at larger interaction reproduced extending Flory for dilute polymer solutions. The overall behavior also compared with predictions...