Variabilidad espacial y temporal del suministro larval de mitílidos en el Seno de Reloncaví, sur de Chile

Barria, Aura M.; Gebauer, Paulina; Molinet, Carlos

doi:10.4067/s0718-19572012000300009

Cited by 25 publications

(8 citation statements)

References 20 publications

(31 reference statements)

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“…In this research, females of C. fecunda began isolating themselves when environmental salinity was <24, a level slightly higher than that previously recorded for females of C. dilatata and the oyster Ostrea chilensis (salinity of 22.5, [33]). Environmental salinities can often be found at depths of 0 to 6 m in the waters of Gulf Reloncavi [62], [63] near Pelluco beach, where individuals of the present investigation were obtained. Additionally, salinities <24 are commonly found at Pelluco beach in tide pools during low tide and heavy rainfall; tidepool salinity may fall to as low as 15 (Person.…”

Section: Discussionmentioning

confidence: 88%

Effects of Low Salinity on Adult Behavior and Larval Performance in the Intertidal Gastropod Crepipatella peruviana (Calyptraeidae)

et al. 2014

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Shallow-water coastal areas suffer frequent reductions in salinity due to heavy rains, potentially stressing the organisms found there, particularly the early stages of development (including pelagic larvae). Individual adults and newly hatched larvae of the gastropod Crepipatella peruviana were exposed to different levels of salinity stress (32(control), 25, 20 or 15), to quantify the immediate effects of exposure to low salinities on adult and larval behavior and on the physiological performance of the larvae. For adults we recorded the threshold salinity that initiates brood chamber isolation. For larvae, we measured the impact of reduced salinity on velar surface area, velum activity, swimming velocity, clearance rate (CR), oxygen consumption (OCR), and mortality (LC50); we also documented the impact of salinity discontinuities on the vertical distribution of veliger larvae in the water column. The results indicate that adults will completely isolate themselves from the external environment by clamping firmly against the substrate at salinities ≤24. Moreover, the newly hatched larvae showed increased mortality at lower salinities, while survivors showed decreased velum activity, decreased exposed velum surface area, and decreased mean swimming velocity. The clearance rates and oxygen consumption rates of stressed larvae were significantly lower than those of control individuals. Finally, salinity discontinuities affected the vertical distribution of larvae in the water column. Although adults can protect their embryos from low salinity stress until hatching, salinities <24 clearly affect survival, physiology and behavior in early larval life, which will substantially affect the fitness of the species under declining ambient salinities.

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Section: Discussionmentioning

confidence: 88%

Effects of Low Salinity on Adult Behavior and Larval Performance in the Intertidal Gastropod Crepipatella peruviana (Calyptraeidae)

et al. 2014

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“…La dominancia de larvas de bivalvos y en particular, de mitílidos, en la cabeza del fiordo Reloncaví, es esperable por la existencia de bancos naturales y centros de cultivo de estos bivalvos a lo largo del fiordo, por el amplio rango de tolerancia que presentan los mitílidos a las variaciones de salinidad propias de un sistema estuarino con una estructura de 3 capas: una superficial de agua dulce que fluye hacia océano, otra intermedia que permite el ingreso de agua más salada y una más profunda de salida del fiordo (Avendaño et al 2011, Barria et al 2012, Castillo 2012, Iriarte et al 2014, Molinet-Flores et al 2015 regulando así la retención o el retorno de larvas (Boicourt 1982). La ocurrencia y abundancia de larvas de bivalvos perforadores de madera, además de explicarse por mecanismos de retención, por la disponibilidad de maderos sumergidos en los fondos de los fiordos (Orellana 2006, Romano et al 2013, sin descartarse que algunas larvas se hayan originado en otras áreas ya que algunas larvas de perforadores de madera pueden ser transportadas grandes distancias (Scheltema 1971).…”

Section: Discussionunclassified

Moluscos planctónicos entre el fiordo Reloncaví y el golfo Corcovado, sur de Chile: ocurrencia, distribución y abundancia en invierno

Campos¹,

Landaeta²

2016

Rev. biol. mar. oceanogr.

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Abstract.-Despite their important ecological functions, knowledge of planktonic mollusks in southern fjords of Chile is limited. Hence, the goals of this research were to determine the composition of the main groups of planktonic mollusks, their geographical distribution and abundance, between the Reloncavi Fjord and the Corcovado Gulf. Plankton samples were collected at 16 oceanographic stations during the CIMAR-19 Fiordos cruise, in July 2013. Oblique hauls were made in two water depth layers according to the pycnocline depth with a WP2 net (180 µm mesh size). The organisms were removed manually from each sample, counted and assigned to the lowest possible taxonomic level. Mollusks were obtained in all stations: Bivalvia (39.68%), Gastropoda (60.31%) and Cephalopoda (0.01%). The total abundance of mollusks varied between 18. 46 and 124.42 ind. m -3 . Among bivalves highlighted the abundance of Pholadidae, Teredinidae and Xylophagidae larvae. Among gastropods highlighted the abundance of Thecosomata and Nudibranchia. Among cephalopods, only Octopoda paralarvae were captured. The abundance of bivalve boring species and their larvae have an important role in the flow of allochthonous organic matter across the fjords. The water temperature and salinity may be the variables that mostly modulate the distribution of planktonic bivalves and gastropods in the Chilean fjords.Key words: Meroplankton, holoplankton, larval ecology, Southeast Pacific, Chilean fjordsResumen.-A pesar de sus importantes funciones ecológicas, el conocimiento de los estados planctónicos de moluscos en fiordos australes de Chile es limitado. De aquí que los objetivos de esta investigación fueron determinar la composición de los principales grupos de moluscos planctónicos, su distribución geográfica y abundancia, entre el fiordo Reloncaví y el golfo Corcovado. Las muestras de plancton se recolectaron en 16 estaciones oceanográficas, durante el Crucero CIMAR 19-Fiordos, en julio 2013. Se efectuaron lances oblicuos en 2 estratos, de acuerdo con la profundidad de la picnoclina con una red WP2 (180 µm abertura de malla). Los organismos fueron separados manualmente de cada muestra, contados y asignados al menor nivel taxonómico posible. Se obtuvieron moluscos en todas las estaciones: Bivalvia (39,68%), Gastropoda (60,31%) y Cephalopoda (0,01%). La abundancia total varió entre 18,46 y 124,42 ind. m -3 . Destacó la abundancia de larvas de bivalvos Pholadidae, Teredinidae y Xylophagidae. De gasterópodos destacó la abundancia de Thecosomata y Nudibranchia. De cefalópodos, solo se capturaron paralarvas de Octopoda. La alta abundancia relativa de larvas de bivalvos perforadores de madera sería un indicador de la presencia de materia orgánica de origen forestal en el fondo de los fiordos y tendrían un rol importante en el flujo de materia orgánica alóctona que llega a los fiordos. La temperatura y salinidad del agua serían las variables que mayormente modularían la distribución de bivalvos y gasterópodos planctónicos en los fiordos chilenos.

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“…was maintained using submersible aquarium heaters with digital controllers. These two experimental temperatures are referred to as 9°C and 12°C in the text, reflecting the mean sea surface temperatures in the study area, Seno de Reloncaví, during the austral winter (May–August, 9°C) and throughout the year (12°C) [37]. Individuals in the lower temperature condition were acclimatized for 2–3 days through a gradual temperature decrease until reaching 9°C.…”

Section: Methodsmentioning

confidence: 99%

Temperature-dependent seminal recovery in the southern king crab Lithodes santolla

2019

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Male-biased fishery management can provoke depletion of seminal reserves, which is the primary cause of sperm limitation. Therefore, identifying factors which contribute to the vulnerability to depletion of seminal reserves is a priority. The present study aimed to determine the effect of temperature on the recovery rate of sperm and seminal reserves after their depletion in Lithodes santolla , an important fishery resource in southern Chile. Sperm and seminal reserves were not fully recovered within 30 days. Temperature significantly affected seminal recovery: after 30 days the recovery index increased to 40% and 21% at 9°C and 12°C, respectively. The twice as fast seminal recovery at 9°C may be explained by the zone of origin of the individuals in this study (northern distributional limit), and 12°C may be close to the threshold of temperature tolerance. Lithodes santolla populations subject to intense male-only fisheries may be vulnerable to depletion of seminal reserves and a climate change scenario could additionally aggravate the risk of seminal depletion in L. santolla in its northern distributional limit.

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Variabilidad espacial y temporal del suministro larval de mitílidos en el Seno de Reloncaví, sur de Chile

Cited by 25 publications

References 20 publications

Effects of Low Salinity on Adult Behavior and Larval Performance in the Intertidal Gastropod Crepipatella peruviana (Calyptraeidae)

Effects of Low Salinity on Adult Behavior and Larval Performance in the Intertidal Gastropod Crepipatella peruviana (Calyptraeidae)

Moluscos planctónicos entre el fiordo Reloncaví y el golfo Corcovado, sur de Chile: ocurrencia, distribución y abundancia en invierno

Temperature-dependent seminal recovery in the southern king crab Lithodes santolla

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