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  1. Article ; Online: Potential Response of Coral Reef’s Functional Structure and Snapper Abundance to Environmental Degradation in San Andres Island, Colombia

    Isabella González-Gamboa / Adriana Santos-Martínez / Yimy Herrera-Martínez

    Acta Biológica Colombiana, Vol 24, Iss

    2019  Volume 1

    Abstract: To determine the coral reef morpho-functional structure of San Andrés, regarding functional benthic ...

    Abstract To determine the coral reef morpho-functional structure of San Andrés, regarding functional benthic diversity and fish (Lutjanidae), we evaluated the condition of the coral structure on the leeward side of the island, which is an area impacted by tourism, through diving and fishing. Three sampling sites were evaluated during two years recording the distribution of benthic organisms, environmental variables and Snappers density (Lutjanidae). A low density of Lutjanus jocu and Ocyurus chrysurus was found, with a high density of juveniles of L. apodus and L. mahogoni, which showed a preference for reefs with submassive and brain corals. Algae especially Macroalgae and octocorals were those with the greatest coverage in the reefs, followed by inert substrates, while corals were epresented by species with a wide distribution such as Agaricia agaricites and Porites astreoides. Octocorals correlated negatively with stony corals and that the most widespread fragile corals were the finger. We concluded that there is a higher density of mainly juvenile snappers where there is a greater variety of coral morpho-functional groups, and not necessarily in sites with greater coral coverage. Also, adult snappers were associated with octocoral zones. This shows that morpho-functional diversity is a crucial factor in the permanence of snappers.
    Keywords Caribbean Sea ; environmental degradation ; Lutjanidae ; reef complexity ; Biology (General) ; QH301-705.5
    Subject code 910
    Language English
    Publishing date 2019-01-01T00:00:00Z
    Publisher Universidad Nacional de Colombia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: MASSIVE QUANTITIES OF PELAGIC Sargassum ON THE SHORES OF SAN ANDRES ISLAND, SOUTHWESTERN CARIBBEAN

    Brigitte GAVIO / M. Natalia RINCÓN-DÍAZ / Adriana SANTOS-MARTÍNEZ

    Acta Biológica Colombiana, Vol 20, Iss

    2015  Volume 1

    Abstract: ... natans, that reached the northeastern coast of San Andres island in September 2014. The time and size ...

    Abstract We report an unusual biomass of floating Sargassum, composed of the species S. fluitans and S. natans, that reached the northeastern coast of San Andres island in September 2014. The time and size of the event is unprecedented to the island.
    Keywords drifting algae ; Sargassum ; San Andres island ; unusual biomass ; Biology (General) ; QH301-705.5
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher Universidad Nacional de Colombia
    Document type Article ; Online
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  3. Article ; Online: MASSIVE QUANTITIES OF PELAGIC Sargassum ON THE SHORES OF SAN ANDRES ISLAND, SOUTHWESTERN CARIBBEAN

    Brigitte GAVIO / M. Natalia RINCÓN-DÍAZ / Adriana SANTOS-MARTÍNEZ

    Acta Biológica Colombiana, Vol 20, Iss 1, Pp 239-

    2015  Volume 241

    Abstract: ... fluitans y S. natans , a la costa nororiental de la isla de San Andrés. La época y el tamaño del evento ...

    Abstract Se reporta la llegada de una biomasa inusual de Sargassum flotante, compuesta por las especies S. fluitans y S. natans , a la costa nororiental de la isla de San Andrés. La época y el tamaño del evento nunca habían sido reportados anteriormente para la isla.
    Keywords Biology (General) ; QH301-705.5
    Language English
    Publishing date 2015-01-01T00:00:00Z
    Publisher Universidad Nacional de Colombia
    Document type Article ; Online
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  4. Article ; Online: MASSIVE QUANTITIES OF PELAGIC Sargassum ON THE SHORES OF SAN ANDRES ISLAND, SOUTHWESTERN CARIBBEAN

    Brigitte GAVIO / M. Natalia RINCÓN-DÍAZ / Adriana SANTOS-MARTÍNEZ

    Acta Biológica Colombiana, Vol 20, Iss 1, Pp 239-

    2014  Volume 241

    Abstract: ... natans , that reached the northeastern coast of San Andres island in September 2014. The time and size of ... de San Andrés Isla, Caribe suroccidental Se reporta la llegada de una biomasa inusual de Sargassum ... Andrés. La época y el tamaño del evento nunca habían sido reportados anteriormente para la isla. ...

    Abstract We report an unusual biomass of floating Sargassum , composed of the species S. fluitans and S. natans , that reached the northeastern coast of San Andres island in September 2014. The time and size of the event is unprecedented to the island. Cantidades masivas de Sargassum pelágicos en las costas de San Andrés Isla, Caribe suroccidental Se reporta la llegada de una biomasa inusual de Sargassum flotante, compuesta por las especies S. fluitans y S. natans , a la costa nororiental de la isla de San Andrés. La época y el tamaño del evento nunca habían sido reportados anteriormente para la isla.
    Keywords drifting algae ; Sargassum ; San Andres island ; unusual biomass ; Biology (General) ; QH301-705.5
    Language English
    Publishing date 2014-11-01T00:00:00Z
    Publisher Universidad Nacional de Colombia
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Book ; Online: Mpemba meets Newton

    Santos, Andrés

    Exploring the Mpemba and Kovacs effects in the time-delayed cooling law

    2024  

    Abstract: Despite extensive research, the fundamental physical mechanisms underlying the Mpemba effect, a phenomenon where a substance cools faster after initially being heated, remain elusive. Although historically linked with water, the Mpemba effect manifests ... ...

    Abstract Despite extensive research, the fundamental physical mechanisms underlying the Mpemba effect, a phenomenon where a substance cools faster after initially being heated, remain elusive. Although historically linked with water, the Mpemba effect manifests across diverse systems, sparking heightened interest in Mpemba-like phenomena. Concurrently, the Kovacs effect, a memory phenomenon observed in materials like polymers, involves rapid quenching and subsequent temperature changes, resulting in nonmonotonic relaxation behavior. This paper probes the intricacies of the Mpemba and Kovacs effects within the framework of the time-delayed Newton's law of cooling, recognized as a simplistic yet effective phenomenological model accommodating memory phenomena. This law allows for a nuanced comprehension of temperature variations, introducing a time delay ($\tau$) and incorporating specific protocols for the thermal bath temperature, contingent on a defined waiting time ($t_{\text{w}}$). Remarkably, the relevant parameter space is two-dimensional ($\tau$ and $t_{\text{w}}$), with bath temperatures exerting no influence on the presence or absence of the Mpemba effect or the relative strength of the Kovacs effect. The findings enhance our understanding of these memory phenomena, providing valuable insights applicable to researchers across diverse fields, ranging from physics to materials science.

    Comment: 13 pages, 15 figures
    Keywords Condensed Matter - Soft Condensed Matter ; Condensed Matter - Materials Science ; Physics - Classical Physics ; Physics - Fluid Dynamics
    Subject code 190
    Publishing date 2024-01-07
    Publishing country us
    Document type Book ; Online
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  6. Article ; Online: Translational and rotational non-Gaussianities in homogeneous freely evolving granular gases.

    Megías, Alberto / Santos, Andrés

    Physical review. E

    2023  Volume 108, Issue 1-1, Page(s) 14902

    Abstract: The importance of roughness in the modeling of granular gases has been increasingly considered in recent years. In this paper, a freely evolving homogeneous granular gas of inelastic and rough hard disks or spheres is studied under the assumptions of the ...

    Abstract The importance of roughness in the modeling of granular gases has been increasingly considered in recent years. In this paper, a freely evolving homogeneous granular gas of inelastic and rough hard disks or spheres is studied under the assumptions of the Boltzmann kinetic equation. The homogeneous cooling state is studied from a theoretical point of view using a Sonine approximation, in contrast to a previous Maxwellian approach. A general theoretical description is done in terms of d_{t} translational and d_{r} rotational degrees of freedom, which accounts for the cases of spheres (d_{t}=d_{r}=3) and disks (d_{t}=2, d_{r}=1) within a unified framework. The non-Gaussianities of the velocity distribution function of this state are determined by means of the first nontrivial cumulants and by the derivation of non-Maxwellian high-velocity tails. The results are validated by computer simulations using direct simulation Monte Carlo and event-driven molecular dynamics algorithms.
    Language English
    Publishing date 2023-07-27
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.108.014902
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  7. Article ; Online: Structural properties of hard-disk fluids under single-file confinement.

    Montero, Ana M / Santos, Andrés

    The Journal of chemical physics

    2023  Volume 159, Issue 3

    Abstract: The structural properties of confined single-file hard-disk fluids are studied analytically by means of a mapping of the original system onto a one-dimensional mixture of non-additive hard rods, the mapping being exact in the polydisperse limit. Standard ...

    Abstract The structural properties of confined single-file hard-disk fluids are studied analytically by means of a mapping of the original system onto a one-dimensional mixture of non-additive hard rods, the mapping being exact in the polydisperse limit. Standard statistical-mechanical results are used as a starting point to derive thermodynamic and structural properties of the one-dimensional mixture, where the condition that all particles have the same chemical potential must be taken into account. Analytical results are then provided for the nth neighbor probability distribution function, the radial distribution function, and the structure factor, a very good agreement being observed upon comparison with simulation data from the literature. Moreover, we have analyzed the scaling form for the disappearance of defects in the zigzag configuration for high pressure and have obtained the translational correlation length and the structural crossover in the oscillation frequency for asymptotically large distances.
    Language English
    Publishing date 2023-07-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0156228
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  8. Article ; Online: Equation of state of hard-disk fluids under single-file confinement.

    Montero, Ana M / Santos, Andrés

    The Journal of chemical physics

    2023  Volume 158, Issue 15

    Abstract: The exact transfer-matrix solution for the longitudinal equilibrium properties of the single-file hard-disk fluid is used to study the limiting low- and high-pressure behaviors analytically as functions of the pore width. In the low-pressure regime, the ... ...

    Abstract The exact transfer-matrix solution for the longitudinal equilibrium properties of the single-file hard-disk fluid is used to study the limiting low- and high-pressure behaviors analytically as functions of the pore width. In the low-pressure regime, the exact third and fourth virial coefficients are obtained, which involve single and double integrals, respectively. Moreover, we show that the standard irreducible diagrams do not provide a complete account of the virial coefficients in confined geometries. The asymptotic equation of state in the high-pressure limit is seen to present a simple pole at the close-packing linear density, as in the hard-rod fluid, but, in contrast to the latter case, the residue is 2. Since, for an arbitrary pressure, the exact transfer-matrix treatment requires the numerical solution of an eigenvalue integral equation, we propose here two simple approximations to the equation of state, with different complexity levels, and carry out an extensive assessment of their validity and practical convenience vs the exact solution and available computer simulations.
    Language English
    Publishing date 2023-04-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3113-6
    ISSN 1089-7690 ; 0021-9606
    ISSN (online) 1089-7690
    ISSN 0021-9606
    DOI 10.1063/5.0139116
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  9. Article ; Online: Revisiting food insecurity gender disparity.

    Silva, Andres / Astorga, Andres / Faundez, Rodrigo / Santos, Karla

    PloS one

    2023  Volume 18, Issue 8, Page(s) e0287593

    Abstract: Previous research has shown that woman-headed households, more than man-headed ones, experience food insecurity. The purpose of this article is to contribute on the determinants that are linked to this gender disparity. Using a nationally representative ... ...

    Abstract Previous research has shown that woman-headed households, more than man-headed ones, experience food insecurity. The purpose of this article is to contribute on the determinants that are linked to this gender disparity. Using a nationally representative dataset from Chile, we found that food security household head gender disparity is associated with marital status (having or not a partner) and household composition (having children or seniors). In contrast, gender disparity is not strongly associated with household income and household head educational differences. In this way, we expect to bring evidence to inform new alternatives that help mitigate food security gender disparity.
    MeSH term(s) Male ; Child ; Female ; Humans ; Socioeconomic Factors ; Food Supply ; Surveys and Questionnaires ; Family Characteristics ; Food Insecurity
    Language English
    Publishing date 2023-08-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2267670-3
    ISSN 1932-6203 ; 1932-6203
    ISSN (online) 1932-6203
    ISSN 1932-6203
    DOI 10.1371/journal.pone.0287593
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  10. Article ; Online: Modelling evolutionary tempo and mode using formal morphological spaces and Markov chain principles.

    Fontanarrosa, Gabriela / Abdala, Virginia / Dos Santos, Daniel Andrés

    Journal of evolutionary biology

    2024  Volume 37, Issue 1, Page(s) 76–88

    Abstract: Evolutionary tempo and mode summarize ancient and controversial subjects of theoretical biology such as gradualism, convergence, contingence, trends, and entrenchment. We employed an integrative methodological approach to explore the evolutionary tempo ... ...

    Abstract Evolutionary tempo and mode summarize ancient and controversial subjects of theoretical biology such as gradualism, convergence, contingence, trends, and entrenchment. We employed an integrative methodological approach to explore the evolutionary tempo and mode of Lepidosaurian phalangeal formulae (PFs). This approach involves quantifying the frequencies of morphological changes along an evolutionary trajectory. The five meristic characters encoded by PFs are particularly valuable in revealing evolutionary patterns, owing to their discrete nature and extensive documentation in the literature. Based on a pre-existing dataset of PFs from 649 taxa (35 Lepidosauria families, including fossils), from which there exists a unique repertoire of 53 formulations, our approach simultaneously considers phenetic and phylogenetic data. This culminates in a diagram accounting for the phylogenetic dynamic of evolution traversing across different regions of morphospace. The method involves enumerating phenotypical options, reconstructing phenotypes across the phylogeny, projecting phenotypes onto a morphospace, and constructing a flow network from the frequency of evolutionary transitions between unique phenotypic conditions. This approach links Markovian chains and evolutionary trajectories to formally define parameters that describe the underlying transitions of morphological change. Among other results, we found that (a) PF evolution exhibits a clear trend towards reduction in the phalangeal count and that (b) evolutionary change tends to occur significantly between morphologically similar PFs. Notwithstanding, although minor but not trivial, transitions between distant formulas -jumps- occur. Our results support a pluralistic view including stasis, gradualism, and saltationism discriminating their prevalence in a target character evolution.
    MeSH term(s) Humans ; Phylogeny ; Biological Evolution ; Markov Chains ; Phenotype ; Fossils
    Language English
    Publishing date 2024-01-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1465318-7
    ISSN 1420-9101 ; 1010-061X
    ISSN (online) 1420-9101
    ISSN 1010-061X
    DOI 10.1093/jeb/voad007
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