Pseudione tuberculata Richardson, 1904 (Isopoda: Bopyridae): a parasite of juveniles of the king crab Lithodes santolla (Molina, 1782) (Anomura: Lithodidae) in the Magellan Strait, Chile

Infestation of Pseudione tuberculata (Isopoda: Bopyridae) on juveniles of Lithodes santolla (Magellan region, Chile): a spatial mesoscale analysis

“…The study of parasites of L. santolla could also be important considering many possible factors regulating the abundance of exploited lithodid crab populations like i) embryonic mortality during egg carrying due to microscopic (e.g., protozoa of the phylum Microsporidia) and macroscopic parasites, ii) environmental and hydrographic variability at local and regional scales, iii) biased stock assessment, iv) increased predatory populations (Morado et al, 2014) and reductions of optimum settling areas (Blaum, 1986;Epelbaum & Borisov, 2007;Cañete et al, 2008;Daly et al, 2009).…”

“…These organisms sterilize their hosts, and produce alterations during gametogenesis and modify several secondary sexual characters; usually the hosts of these parasites belong to different decapod crustacean taxa (Dall et al, 1990;Thatje, 2003;Cañete et al, 2008;Morado et al, 2014). The bopyrid isopod of the genus Pseudione is a recurrent parasite of several benthonic crustaceans along the Chilean coast and to date five species have been identified: P. tuberculata (Miranda-Vargas & Roccatagliata, 2004;Cañete et al, 2008), P. brattstroemi, parasitizing Neotrypaea uncinata (Stuardo et al, 1986), P. humboldtensis parasitizing squat lobsters Cervimunida johni and Pleuroncodes monodon (Pardo et al, 1998), P. chiloensis parasitizing Nauticaris magellanica (Román-Contreras & Werthmann, 1997) and P. galacanthae, recently reported parasitizing the squat lobster Munida subrugosa in the Strait of Magellan off Punta Arenas (J.I. Cañete, unpublished data).…”

Presencia de Cistenides Elhersi Hessle, 1917 (Polychaeta Perctinariidae) en aguas someras magallánicas habitadas por praderas de Ruppia Filifolia: Evidencia de Euribatia, Eurihalididad y Euritermia?

“…Uno de los impactos más significativos podría ser la mortalidad dada la incapacidad del bentos de evadir masas de agua de baja salinidad. Cañete et al (2004), Cañete et al (2008) y Cañete et al (2010 han sugerido que la distribución espacial y la dinámica estacional de algunos organismos bentónicos de vida parasitaria (isópodo del género Pseudione) como de vida libre (poliquetos) de la zona de Magallanes podrían responder a variaciones en las descargas de agua dulce provistas por diferentes ríos que desembocan en el estrecho de Magallanes. Recientemente, también se ha sugerido que la dinámica reproductiva y el ciclo de producción de ovicápsulas del gasterópodo fusitriton magellanicus podría estar sincronizado con la dinámica estacional de las descargas del río San Juan, estrecho de Magallanes (Cañete et al 2012).…”

Encapsulated development, spawning and early veliger of the ranellid snail Fusitriton magellanicus (Roding, 1798) in the cold waters of the Magellan Strait, Chile

“…According to Figure 2, the flow of the San Juan River, about 1 km away from Santa Ana Point, also increases significantly in early spring and decreases in early summer. This could be a strategy to avoid predation by sea stars, which are very abundant and diverse in the study area (Cañete et al, 2008) being the largest and are the larger predators because of their inability to regulate their internal and because osmotic pressure (Brusca & Brusca, 2005). Larvae will hatch when salinity conditions become more suitable for pelagic development, which are re-established in December.…”

“…2). Seasonally, the freshwater flow to the bay is reduced during the summer (6.3 to 9.4 m 3 s -1 ); it is frozen in winter and achieves maximum values from September to October (spring in the southern hemisphere) of 29.0 to 32.7 m 3 s -1 (Cañete et al, 2008). The northern side of Santa Ana Point is characterized by the presence of steep rock walls and large boulders (Newcombe & Cárdenas, 2011).…”