Hybridisations between Mytilus edulis and Mytilus galloprovincialis and performance of pure species and hybrid veliger larvae at different temperatures

Efecto de la temperatura en el desarrollo embrionario y larval del mejillón, Mytilus galloprovincialis (Lamarck, 1819)

“…Considerando que los datos disponibles para M. galloprovincialis sobre crecimiento a distintas temperatura (His et al 1989, Beaumont et al 2004) no tuvieron como objetivo establecer tasas de crecimiento larval, no es posible hacer comparaciones específicas respecto al efecto de la temperatura en distintas poblaciones de esta especie. Satuito et al (1994) entregan información sobre crecimiento larval a 19 ± 1ºC, la cual comparada con nuestros resultados es sólo similar a la tasa obtenida a 16ºC (Fig.…”

Production and performance of larvae and spat of pure and hybrid species of Mytilus chilensis and M. galloprovincialis from laboratory crosses

“…This difference in natural hybridization in these two mussel hybrid zones implies that M. edulis and M. galloprovincialis are more closely related (Gardner, 1994) than are M. edulis and M. trossulus (Rawson et al, 1996). This has been corroborated by successful interbreeding between M. edulis and M. galloprovincialis, the production of viable offspring in back-crosses of F1 hybrids (Beaumont et al, 2004) and the suggestion made by Gardner (1994) that M. galloprovincialis may be a subspecies of M. edulis, proposing the use of the trinomial form M. edulis galloprovincialis.…”

“…Las larvas y juveniles híbridos de ambos cruzamientos recíprocos crecieron significativamente más que las larvas de los cruzamientos de especies puras, aunque los valores de longitud de la valva están dentro de los rangos reportados en la bibliografía. There is no evidence in the literature for the presence of unfit hybrid recombinants within Mytilus hybrid zones (Comesaña et al, 1999;Toro et al, 2002;Beaumont et al, 2004;Westfall & Gardner, 2010;Dias et al, 2011). As discussed by Comesaña et al (1999), the degree of natural hybridization is generally higher in the Mytilus edulis-M. galloprovincialis hybrid zone in Europe than in the M. edulis-M. trossulus hybrid zone on the east coast of north America.…”

“…There was, however, a significant difference in growth between hybrid larvae of the two reciprocal crosses, the M. chilensis (female) crossed with M. galloprovincialis (male) hybrids being the lower growing larvae (Table 1). Juveniles from these crosses were evaluated for their shell length and total wet weight at day 164 after fertilization, showing significant differences between pure species crosses and their hybrids ( Beaumont et al (2004) for crosses between M. edulis and M. galloprovincialis and by Freeman et al (1994) for crosses between M. edulis and M. trossulus. Growth of bivalves seems to be related to the genetic conformation of the individual (Meyer & Manahan, 2010).…”

Effect of temperature on the culture of larvae of the bivalve Mytilus chilensis originated from broodstocks from different latitudes in a controlled environment

“…While studies have shown that the growth of bivalve larvae is positively related to temperature (Lutz and Kennish 1992, Beaumont et al 2004, Ruiz et al 2008, Rico-Villa et al 2009, Galley et al 2010, the growth of larvae from natural populations separated by several degrees of latitude has not been compared. The objective of this study was to determine whether M. chilensis larvae originating from broodstocks from different latitudes (Chiloé and Punta Arenas), with slight genetic differentiation (Toro et al 2004a(Toro et al , 2004b(Toro et al , 2006, exhibit differences in their growth and survival rates at the same culture temperatures.…”