scholarly journals Variabilidad espacial de ensambles bentónicos intermareales en Bahía Yendegaia, Canal Beagle, ecorregión subantártica de Magallanes.

2021 ◽  
Author(s):  
Juan Pablo Rodríguez Provoste ◽  
Sebastian Rosenfeld ◽  
Francisco Bahamonde ◽  
Ricardo Rozzi ◽  
Andrés Mansilla
Keyword(s):  
Perumytilus Purpuratus

La ecorregión subantártica de Magallanes posee una heterogénea costa de fiordos y canales, con una gran extensión de ecosistemas intermareales sujetos al efecto de condiciones climáticas extremas características de zonas de altas latitudes. Estudios recientes sugieren que la estructura de los ensambles intermareales que habitan en ambientes extremos, como subantárticos y antárticos, presentan altas variaciones horizontales y verticales que se acentúan a escalas espaciales finas. Este podría ser un patrón general en hábitats intermareales de altas latitudes del hemisferio sur, y en este este trabajo evaluamos la hipótesis que la variabilidad horizontal y vertical de los ensambles bentónicos intermareales en ambientes extremos subantárticos es mayor a escalas finas. En marzo-abril 2017 analizamos la variabilidad espacial sobre los ensambles bentónicos intermareales de Bahía Yendegaia, Reserva de la Biosfera Cabo de Hornos, como modelo de estudio con un diseño anidado con diferentes escalas espaciales que van desde centímetros a kilómetros. El análisis de los componentes de varianza y pseudo-varianza mostró una significativa variación horizontal y vertical a escalas finas. Identificamos seis comunidades con una marcada zonación vertical. Las especies más representativas fueron el molusco Perumytilus purpuratus y las algas Porphyra/Pyropia sp1. y Ulva flexuosa. Estas especies tuvieron una alta variación vertical en escalas finas. Estos patrones apoyan la hipótesis testeada, sin embargo, es probable que factores físicos locales del hábitat relacionados con cambios abióticos también influyan significativamente sobre las variaciones espaciales a pequeñas escalas en las comunidades de Bahía Yendegaia. Para evaluar el papel de factores físicos, proponemos extender este tipo de estudios incorporando la variabilidad temporal y datos ambientales en bruto. Estos estudios permitirán detectar los factores locales más influyentes sobre la variación espacial de los ensambles bentónicos intermareales subantárticos. Este estudio aporta información de base valiosa sobre patrones de distribución a escala espacial fina y propone factores ecológicos adicionales que podrían incidir sobre la distribución y abundancia de especies y ensambles bentónicos intermareales en ecosistemas subantárticos de Magallanes.

scholarly journals Phenotypic plasticity at fine-grained spatial scales: the scorched mussel Perumytilus purpuratus growing on Patagonian rocky salt-marshes

2020 ◽  
Vol 84 (4) ◽  
pp. 393-401
Author(s):  
Yamila Gonzalez Giorgis ◽  
María Cruz Sueiro ◽  
Federico Márquez
Keyword(s):  
Phenotypic Plasticity ◽  
Environmental Conditions ◽  
Range Expansion ◽  
Salt Marshes ◽  
Spatial Scales ◽  
Shell Shape ◽  
Patch Type ◽  
Fine Grained ◽  
Perumytilus Purpuratus ◽  
Ecological Range

Understanding phenotypic plasticity of species at different spatial scales is vital in the current context of an increasing pace of environmental changes. Through this knowledge, it is possible to predict their potential to adapt and/or evolve in face of new environmental conditions such as climate change, and/or to understand their ecological range expansion. In Patagonian rocky salt-marshes, one of the most abundant invertebrate species is the scorched mussel Perumytilus purpuratus. In this system, this mussel can be found inhabiting both vegetated and non-vegetated patches, which differ in critical environmental conditions. We performed a field study evaluating whether mussels growing in vegetated patches differ in shell shape from those growing in adjacent non-vegetated patches. We sampled individuals from both patch types and assessed their shell shape and size using geometric morphometrics. The results showed that mussels from vegetated patches had shells that were more dorsoventrally expanded, anterodorsally restricted and globose in shape than those from non-vegetated patches, which showed the opposite traits resulting in a more elongated shell. The differences found could be driven by the different conditions of temperature, desiccation rate, wave action and population density to which mussels are exposed in each patch type. These results revealed the striking phenotypic plasticity of shell form of this native species at a fine-grained scale, which could be one of the explanations for its success in its ecological range expansion.

Reproductive patterns of mussel Perumytilus purpuratus (Bivalvia: Mytilidae), along the Chilean coast: effects caused by climate change?

2016 ◽  
Vol 98 (2) ◽  
pp. 375-385 ◽  
Author(s):  
Pablo A. Oyarzún ◽  
Jorge E. Toro ◽  
José Garcés-Vargas ◽  
Claudia Alvarado ◽  
Ricardo Guiñez ◽  
...  
Keyword(s):  
Climate Change ◽  
Latitudinal Gradient ◽  
Pacific Coast ◽  
Gonadosomatic Index ◽  
Natural Populations ◽  
Development Stage ◽  
Annual Cycles ◽  
Negative Linear Correlation ◽  
Perumytilus Purpuratus ◽  
Reproductive Cycles

Reproductive cycles were studied in seven natural populations of the intertidal bivalve Perumytilus purpuratus, distributed in a latitudinal gradient of ~2400 km along the Chilean Pacific coast (20–40°S). The results, both qualitative (gametogenic stages) and quantitative (GSI and GVF), over a period of 24 months, showed that these populations presented asynchrony in the reproductive cycle. Semi-annual cycles in Iquique (20°S), Antofagasta (23°S) and Montemar (32°S), and annual cycles in Caleta Bolfin (23°S), Taltal (25°S), Tumbes (36°S) and Pucatrihue (40°S) (2010–2012) were found. The results indicate that latitude does not have an effect on the development stage, but it does on the spawning date. However, there is a relationship between the reproductive cycles and temperature fluctuations. In addition, there was a significant negative linear correlation between gonadosomatic index and sea surface temperature in the populations studied. The decrease in temperature reduces the rate of development stages and, therefore, increases the reproductive cycles from semi-annual to annual, as evidenced in bivalve samples from Taltal, along a semi-decadal period (2007–2012). From these results, we discuss the likely biological and ecosystem consequences in connection to the effects of climate change in the South Pacific.

Sperm polymorphism and genetic divergence in the mussel Perumytilus purpuratus

2012 ◽  
Vol 159 (8) ◽  
pp. 1865-1870 ◽  
Author(s):  
Carolina Briones ◽  
Ricardo Guiñez ◽  
Orlando Garrido ◽  
Pablo A. Oyarzún ◽  
Jorge E. Toro ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Sperm Polymorphism ◽  
Perumytilus Purpuratus

scholarly journals NIVELES DE Cu, Pb Y Zn EN AGUA Y PERUMYTILUS PURPURATUS EN BAHIA SAN JORGE, NORTE DE CHILE

2004 ◽  
Vol 68 (1) ◽  
Author(s):  
Marco A. Salamanca ◽  
Bibiana Jara ◽  
Tatiana Rodríguez
Keyword(s):  
Perumytilus Purpuratus

scholarly journals Report of pathogens and parasites in Perumytilus purpuratus from San Jorge Bay, Antofagasta, Chile

2012 ◽  
Vol 47 (2) ◽  
pp. 345-350 ◽  
Author(s):  
Diana Montenegro ◽  
Brian Jones ◽  
María Teresa González
Keyword(s):  
Perumytilus Purpuratus
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