<?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>0185-3880</journal-id>
<journal-title><![CDATA[Ciencias marinas]]></journal-title>
<abbrev-journal-title><![CDATA[Cienc. mar]]></abbrev-journal-title>
<issn>0185-3880</issn>
<publisher>
<publisher-name><![CDATA[Universidad Autónoma de Baja California, Instituto de Investigaciones Oceanológicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-38802020000400283</article-id>
<article-id pub-id-type="doi">10.7773/cm.v46i4.3156</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Urchin Searchin&#8217;: Red sea urchins and drift kelp found at 284 m depth in the mesophotic zone]]></article-title>
<article-title xml:lang="es"><![CDATA[En búsqueda de erizos: Erizos de mar rojos y detritos de algas hallados a 284 m de profundidad en la zona mesofótica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Lowe]]></surname>
<given-names><![CDATA[Alexander T.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Galloway]]></surname>
<given-names><![CDATA[Aaron WE.]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Smithsonian Institution  ]]></institution>
<addr-line><![CDATA[ Maryland]]></addr-line>
<country>USA</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,University of Oregon Oregon Institute of Marine Biology ]]></institution>
<addr-line><![CDATA[ Oregon]]></addr-line>
<country>USA</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>00</month>
<year>2020</year>
</pub-date>
<volume>46</volume>
<numero>4</numero>
<fpage>283</fpage>
<lpage>296</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-38802020000400283&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-38802020000400283&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-38802020000400283&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT. Red sea urchins (Mesocentrotus franciscanus) are kelp-associated ecosystem engineers found in rocky habitats throughout the North Pacific from Baja California, Mexico, to Japan. Red sea urchins depend on kelp detritus, herein &#8216;drift&#8217;, for nutrition; in open coast loca tions (e.g., California) sea urchin abundance declines precipitously with depth outside the kelp forest owing to a lack of drift and habitat. In the Salish Sea, a region of the Northeast Pacific characterized by steep, glacier-carved rocky reefs, red sea urchins have been reported to 125 m depth. Considering the natural history of this species, we predicted red sea urchins could be found deeper than 125 m in areas with hard substrate and abundant drift. We paired submersible and scuba transects to search for deep red sea urchins and quantified availability of drift to sea urchins from the mesophotic (290 m) to macrophyte zones (&lt;20 m). In addition, we quantified the rate of drift capture by sea urchins at the upper boundary of the mesophotic zone to assess patterns of food availability. A red sea urchin was observed at 284 m, more than doubling this species&#8217; known depth range. Red sea urchins and drift were observed in all depth zones surveyed and 24% of sea urchins had captured drift. Drift capture across depth varied between sites and contrasts observations from other deep regions, such as Dume Submarine Canyon, on the Southern California coast. Red sea urchins captured abundant drift (15.4 g drift per urchin per day) at the edge of the mesophotic zone, implying that red sea urchins could facilitate a considerable nutritional subsidy to local benthos. These observations open new avenues for research as the sheltered, rugose coastline in the Salish Sea is representative of &gt;90% of rocky shorelines in the Northeast Pacific from Baja California to Alaska, suggesting a major portion of the red sea urchin&#8217;s habitat, and natural history, remains to be explored.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN. Los erizos de mar rojos (Mesocentrotus franciscanus) son ingenieros de ecosistemas asociados a algas que se encuentran en hábitats rocosos en todo el Pacífico Norte, desde Baja California, México, hasta Japón. Los erizos rojos dependen de los detritos de algas marinas, en adelante &#8216;detritos a la deriva&#8217;, para la nutrición; en lugares de la costa abierta (e.g., California), la abundancia de erizos disminuye abruptamente con la profundidad fuera del bosque de algas marinas debido a la falta de detritos a la deriva y hábitat. En el mar de Salish, una región del Pacífico nororiental caracterizada por arrecifes rocosos empinados y tallados en glaciares, los erizos rojos han sido reportados a una profundidad de 125 m. Con base en la historia natural de esta especie, predijimos que los erizos rojos podrían encontrarse a más de 125 m de profundidad en áreas con sustrato duro y detritos a la deriva abundante. Emparejamos transectos sumergibles y de buceo para buscar erizos rojos de aguas profundas y cuantificar la disponibilidad de detritos a la deriva para los erizos desde la zona mesofótica (290 m) hasta la macró fita (&lt;20 m). Además, cuantificamos la tasa de captura de los detritos a la deriva por los erizos en el límite superior de la zona mesofótica para evaluar los patrones de disponibilidad de alimento. Se observó un erizo rojo a 284 m, lo cual duplica por más del doble el intervalo de profun didad conocido para esta especie. Se observaron erizos rojos y detritos a la deriva en todas las zonas de profundidad estudiadas y el 24% de los erizos había capturado detritos a la deriva. La captura de los detritos a la deriva con la profundidad varió entre los sitios y contrasta con las observaciones de otras regiones profundas, como Dume Submarine Canyon, en la costa sur de California. Los erizos rojos capturaron detritos a la deriva en abundancia (15.4 g de detritos a la deriva por erizo por día) en el borde de la zona mesofótica, lo que implica que los erizos rojos podrían facilitar un subsidio nutricional considerable al bentos local. Estas observaciones abren nuevas vías para la investigación, ya que la costa rugosa protegida en el mar de Salish es representativa del &gt;90% de las costas rocosas en el Pacífico nororiental, desde Baja California hasta Alaska, lo que sugiere que una gran parte del hábitat y la historia natural del erizo rojo aún queda por ser explorada.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Mesocentrotus franciscanus]]></kwd>
<kwd lng="en"><![CDATA[spatial subsidy]]></kwd>
<kwd lng="en"><![CDATA[marine food web]]></kwd>
<kwd lng="en"><![CDATA[kelp forest]]></kwd>
<kwd lng="en"><![CDATA[ecosystem engineer]]></kwd>
<kwd lng="es"><![CDATA[Mesocentrotus franciscanus]]></kwd>
<kwd lng="es"><![CDATA[subsidio espacial]]></kwd>
<kwd lng="es"><![CDATA[red alimentaria marina]]></kwd>
<kwd lng="es"><![CDATA[bosque de algas]]></kwd>
<kwd lng="es"><![CDATA[ingeniero de ecosistema]]></kwd>
</kwd-group>
</article-meta>
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