Patrones estacionales y espaciales de la diversidad de moluscos intermareales de bahía Róbalo, canal Beagle, Reserva de la Biosfera Cabo de Hornos, Chile

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This article characterizes molluscs assemblages in Róbalo bay, identifying spatial-temporal changes in assemblage composition, species richness, abundance, functional groups, and diversity of molluscs species.

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17 p.

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Ojeda, Jaime; Rosenfeld, Sebastián; Marambio, Johanna; Rozzi, Ricardo & Mansilla, Andrés O. August 28, 2014.

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  • Main Title: Patrones estacionales y espaciales de la diversidad de moluscos intermareales de bahía Róbalo, canal Beagle, Reserva de la Biosfera Cabo de Hornos, Chile
  • Parallel Title: Seasonal and spatial patterns of intertidal molluscs diversity of Róbalo Bay, Beagle Channel, Biosphere Reserve Cape Horn, Chile

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Description

This article characterizes molluscs assemblages in Róbalo bay, identifying spatial-temporal changes in assemblage composition, species richness, abundance, functional groups, and diversity of molluscs species.

Physical Description

17 p.

Notes

Abstract: Chilean sub-Antarctic Channels region is one of the most diverse regions in molluscs species of the South Pacific
Ocean in South America. This region exhibit intertidal zones with a high environmental heterogeneity at a local scale,
including seasonal changes in photoperiod, rocky substrate diversity, salinity and temperature gradi ents. This study
characterized molluscs assemblages in Róbalo bay 54°55’S (Beagle Channel), identifying spatial-temporal changes in
assemblage composition, species richness, abundance, functional groups, and diversity of molluscs species. We registered
34 species comprising 4 functional groups, being mobile herbivores the most diverse group (21 species). The most abundant
molluscs were Mytilus edulis platensis and Perumytilus purpuratus. Considering the mobile species only, the most abundant
were Laevilitorina caliginosa and Siphonaria lessonii. In seasonal terms, species richness and abundance of mobile
herbivores showed an increase during the austral summer. While the abundance of M. edulis platensis and mobile carnivores
remained stable during the seasons. Regarding vertical zonation within the intertidal, we found that L. caliginosa is mainly
associated with high intertidal, Pareuthria plumbea to the mid-zone, and N. deaurata to the low intertidal zone. Róbalo Bay
high beta molluscs diversity was associated to the spatial variability of intertidal zones. These changes can be detected
in between sites separated only by hundreds of meters, where local environmental heterogeneity likel y plays a role
structuring ecological assemblages and communities Sub-Antarctic channels.

Resumen: Los canales subantárticos de Chile son una de las regiones con mayor diversidad de moluscos del océano
Pacífico en el sur de Sudamérica. Esta región presenta extensas zonas intermareales sujetas a una marcada estacionalidad
con cambios en el fotoperiodo y una alta heterogeneidad ambiental, que incluye diversidad de sustrat os, gradientes de
salinidad y temperatura. El presente estudio caracterizó el ensamble de moluscos de bahía Róbalo 54°55’S (canal Beagle)
y evaluó los cambios espacio-estacionales de la composición, riqueza y diversidad de moluscos. Se registraron 34 especies
de moluscos, y se caracterizaron 4 grupos funcionales, siendo el más diverso los herbívoros móviles (21 especies). Los
moluscos más abundantes fueron los filtradores sésiles, Mytilus edulis platensis y Perumytilus purpuratus. Las especies
móviles más abundantes fueron Laevilitorina caliginosa y Siphonaria lessonii. En términos estacionales, la riqueza de
especies y abundancia de los herbívoros móviles presentaron un aumento durante el verano austral. Mi entras que la
abundancia de M. edulis platensis y los carnívoros móviles se mantuvieron estables durante las estaciones. Respecto a la
zonificación vertical dentro del intermareal, se encontró que L. caliginosa está asociada principalmente al intermareal
alto, Pareuthria plumbea a la zona media y N. deaurata al intermareal bajo. En bahía Róbalo se registró una alta diversidad
beta de moluscos, asociada a la variabilidad espacial de las zonas intermareales. Estos cambios se pueden detectar entre
sitios separados por centenas de metros, donde la heterogeneidad ambiental local probablemente juega un rol ecológico
en la estructuración de ensambles y comunidades en canales subantárticos.

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  • Revista de Biología Marina y Oceanografía, 2014. Viña del Mar, Chile: University of Valparaíso

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Publication Information

  • Publication Title: Revista de Biología Marina y Oceanografía
  • Volume: 49
  • Issue: 3
  • Pages: 493-509
  • Peer Reviewed: Yes

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  • August 28, 2014

Submitted Date

  • October 9, 2013

Added to The UNT Digital Library

  • June 26, 2018, 9:56 p.m.

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Ojeda, Jaime; Rosenfeld, Sebastián; Marambio, Johanna; Rozzi, Ricardo & Mansilla, Andrés O. Patrones estacionales y espaciales de la diversidad de moluscos intermareales de bahía Róbalo, canal Beagle, Reserva de la Biosfera Cabo de Hornos, Chile, article, August 28, 2014; Viña del Mar, Chile. (digital.library.unt.edu/ark:/67531/metadc1181171/: accessed November 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.