<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0034-7744</journal-id>
<journal-title><![CDATA[Revista de Biología Tropical]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. biol. trop]]></abbrev-journal-title>
<issn>0034-7744</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Costa Rica]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-77442016000200427</article-id>
<article-id pub-id-type="doi">10.15517/rbt.v64i2.19810</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Distribución espacial y estructura morfométrica de las praderas de Thalassia testudinum (Hydrocharitaceae) en dos arrecifes del Parque Nacional Sistema Arrecifal Veracruzano, México]]></article-title>
<article-title xml:lang="en"><![CDATA[Spatial distribution and ecological structure of Thalassia testudinum (Hydrocharitaceae) in two reefs of Veracruz Reef System National Park, Mexico.]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Arellano-Méndez]]></surname>
<given-names><![CDATA[Leonardo U.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Bello-Pineda]]></surname>
<given-names><![CDATA[Javier]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aké-Castillo]]></surname>
<given-names><![CDATA[José A.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[PérezEspaña]]></surname>
<given-names><![CDATA[Horacio]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martinez-Cardenas]]></surname>
<given-names><![CDATA[Leonardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma de Tamaulipas Instituto de Ecología Aplicada ]]></institution>
<addr-line><![CDATA[Tamaulipas ]]></addr-line>
<country>MX</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Veracruzana Instituto de Ciencias Marinas y Pesquerías ]]></institution>
<addr-line><![CDATA[Veracruz ]]></addr-line>
<country>MX</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Autónoma de Nayarit Secretaria de Investigación y Posgrado ]]></institution>
<addr-line><![CDATA[Tepic Nayarit]]></addr-line>
<country>MX</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2016</year>
</pub-date>
<volume>64</volume>
<numero>2</numero>
<fpage>427</fpage>
<lpage>448</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S0034-77442016000200427&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S0034-77442016000200427&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S0034-77442016000200427&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[ResumenLos pastos marinos son ambientes costeros que se han visto amenazados por el incremento de las actividades humanas. Alterando de forma negativa los procesos y servicios ambientales que presentan, así como la disminución de praderas. El objetivo es generar conocimiento de la distribución, estado de la estructura y nivel de fragmentación en dos arrecifes del Parque Nacional Sistema Arrecifal Veracruzano (PNSAV). Se eligieron dos praderas en arrecifes con características distintas: Sacrificios en el Norte que se encuentra cerca de la costa y Cabezo en el Sur que está alejado de la costa. Se determinaron las características específicas de haz y área de las praderas de macrófitas sumergidas presentes e identificaron cuatro grupos de cobertura morfofuncionales. Se comprobaron diferencias significativas entre coberturas (ANOVA no paramétrico, prueba de Kruskal-Wallis). Se realizó una clasificación supervisada de una imagen espacial de alta resolución verificada con datos de campo (55 Sacrificios y 290 Cabezo). El nivel de fragmentación se calculó usando métricas de paisaje a nivel de clase y se realizaron mapas temáticos en función de las cuatro coberturas. Las praderas se encuentran dominadas por Thalassia testudinum; se tuvieron densidades máximas de 208 haces/m2 para Cabezo y 176 haces/m2 en Sacrificios. Cabezo presentó pastos de hojas cortas (9 cm) y delgadas (0.55 cm) en promedio; Sacrificios tuvo hojas más largas (23.5 cm) y gruesas (1 cm). Sacrificios mostró menor grado de fragmentación que Cabezo; en ambos casos la fragmentación de la cobertura vegetal corresponde a menos del 50 %. Aunque el arrecife Cabezo presenta una mayor fragmentación, que crea un gran número de microambientes, siendo reconocido por su importancia como zona de reclutamiento. Este trabajo sirve como una línea de base para la creación de un plan de manejo adecuado (formación de una zona núcleo de Cabezo). Es necesario complementar este trabajo con nuevos esfuerzos del reconocimiento de las praderas de pastos marinos en todos los arrecifes del PNSAV, así como de monitoreos periódicos y reconocimiento de sus servicios ecosistémicos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[AbstractSeagrasses in coastal environments have been threatened by increased human activities; these have negatively altered processes and environmental services, and have decreased grassland areas. The aim of this study was to generate knowledge of Thalassia testudinum distribution, state of the structure and fragmentation level in two reefs of the Veracruz Reef System National Park (PNSAV). Two different reefs were selected: Sacrificios in the North and near the coast, and Cabezo in the South and away from the coast. Shoot-specific and area-specific characteristics of submerged macrophytes meadows present were determined, and four morpho-functional groups were identified. Significant differences between plant coverage were tested through nonparametric ANOVA, Kruskal-Wallis test. A supervised classification of spatial high-resolution image verified with field data was performed (55 Sacrificios and 290 Cabezo). The fragmentation level was calculated using landscape metrics, class level and thematic maps were made based on four covers. The meadows were dominated by Thalassia testudinum; maximum densities were 208 shoot/m2 in Cabezo, and 176 shoot/m2 in Sacrificios. Cabezo presented grasses with short (9 cm) and thin leaves (0.55 cm) on average; while Sacrificios showed longer (23.5 cm) and thicker (1 cm) leaves. Sacrificios showed lower fragmentation degree than Cabezo; in both cases, the vegetation cover fragmentation corresponded to less than 50 %. Although Cabezo reef presents further fragmentation, which creates a large number of microenvironments, being recognized for its importance as recruitment area. This work serves as a baseline for the creation of an adequate management plan (formation of a core area of Cabezo). It is necessary to complement this work with new efforts for the recognition of seagrass prairies in all PNSAV reefs, as well as periodic monitoring and recognition of ecosystem services. Rev. Biol. Trop. 64 (2): 427-448. Epub 2016 June 01.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Thalassia testudinum]]></kwd>
<kwd lng="es"><![CDATA[distribución]]></kwd>
<kwd lng="es"><![CDATA[estructura]]></kwd>
<kwd lng="es"><![CDATA[mapeo]]></kwd>
<kwd lng="es"><![CDATA[ecología del paisaje.]]></kwd>
<kwd lng="en"><![CDATA[Thalassia testudinum]]></kwd>
<kwd lng="en"><![CDATA[distribution]]></kwd>
<kwd lng="en"><![CDATA[structure]]></kwd>
<kwd lng="en"><![CDATA[mapping]]></kwd>
<kwd lng="en"><![CDATA[landscape ecology]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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