Damian Gaspar Gil | Universidad Nacional de la Patagonia (original) (raw)
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Papers by Damian Gaspar Gil
Marine Biology, Jul 30, 2011
Revista De Biologia Tropical, 2008
Aquatic Ecology, Mar 7, 2021
Marine Pollution Bulletin, 2020
Invertebrate Reproduction & Development, Nov 14, 2014
ABSTRACT This study reports nutrient allocation in different stages of gonadal development for tw... more ABSTRACT This study reports nutrient allocation in different stages of gonadal development for two populations of the sea urchin Arbacia dufresnii off the Patagonian coast of Argentina (Nuevo Gulf and San Jorge Gulf). The biochemical composition of gonads was used to assess nutrient allocation by measuring ash, soluble protein, lipid and trichloroacetic acid-soluble carbohydrate concentrations, and absolute contents over a 24-month period. Reproductive output in terms of energy was calculated for females. Results were correlated with istological stage of the gonads. Soluble proteins were the main component for the Nuevo Gulf population while unmeasured organic material (i.e. insoluble proteins and nucleic acids, especially in testes) was revalent in gonads from San Jorge Gulf. Soluble protein and lipid concentrations followed the gonadal cycle, while carbohydrate concentration was almost negligible, especially in the Nuevo Gulf population. The different patterns in the gonadal cycle in the two populations were reflected in the biochemical composition of gonads. Concentrations and contents of the biochemical components and reproductive output were higher in the population from San Jorge Gulf owing to the larger size of gonads and gametes. These findings contribute to the better understanding of the plasticity of the reproductive biology of A. dufresnii in different environments.
Marine and Freshwater Research, 2015
Springer eBooks, Aug 4, 2012
Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at... more Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at the Argentine Museum of Natural Sciences ''Bernardino Rivadavia''(MACN), who dedicated 55 years of her life to study the echinoderms inhabiting the Argentine Sea. Her first studies were focused on Echinoidea of Tierra del Fuego (54 S, 68 W) and Ophiuroidea and Crinoidea of South Georgia islands. In 1924, she published the first work with pictures and drawings of the most common sea urchins (Bernasconi 1924). In 1935, she published ...
Marine Biology Research, 2020
Invertebrate Biology, 2020
Marine Biology, Aug 7, 2018
Invertebrate Reproduction & Development, 2014
ABSTRACT This study reports nutrient allocation in different stages of gonadal development for tw... more ABSTRACT This study reports nutrient allocation in different stages of gonadal development for two populations of the sea urchin Arbacia dufresnii off the Patagonian coast of Argentina (Nuevo Gulf and San Jorge Gulf). The biochemical composition of gonads was used to assess nutrient allocation by measuring ash, soluble protein, lipid and trichloroacetic acid-soluble carbohydrate concentrations, and absolute contents over a 24-month period. Reproductive output in terms of energy was calculated for females. Results were correlated with istological stage of the gonads. Soluble proteins were the main component for the Nuevo Gulf population while unmeasured organic material (i.e. insoluble proteins and nucleic acids, especially in testes) was revalent in gonads from San Jorge Gulf. Soluble protein and lipid concentrations followed the gonadal cycle, while carbohydrate concentration was almost negligible, especially in the Nuevo Gulf population. The different patterns in the gonadal cycle in the two populations were reflected in the biochemical composition of gonads. Concentrations and contents of the biochemical components and reproductive output were higher in the population from San Jorge Gulf owing to the larger size of gonads and gametes. These findings contribute to the better understanding of the plasticity of the reproductive biology of A. dufresnii in different environments.
Echinoderm Research and Diversity in Latin America, 2012
Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at... more Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at the Argentine Museum of Natural Sciences ''Bernardino Rivadavia''(MACN), who dedicated 55 years of her life to study the echinoderms inhabiting the Argentine Sea. Her first studies were focused on Echinoidea of Tierra del Fuego (54 S, 68 W) and Ophiuroidea and Crinoidea of South Georgia islands. In 1924, she published the first work with pictures and drawings of the most common sea urchins (Bernasconi 1924). In 1935, she published ...
Echinoderm Research and Diversity in Latin America, 2012
The reproductive cycle of the sub-Antarctic spatangoid sea urchin, Abatus cavernosus, was examine... more The reproductive cycle of the sub-Antarctic spatangoid sea urchin, Abatus cavernosus, was examined during a two-year period in southern Patagonia, Argentina. The population studied is the northernmost known coastal population in the austral oceans, and is influenced by a greater annual range of seawater temperature than other Abatus species. The sex ratio of the overall A. cavernosus population did not differ significantly from 1: 1, but was not homogeneous across size classes. A clearly defined annual reproductive cycle ...
Aquatic Ecology, 2021
Pseudechinus magellanicus is one of the most abundant sea urchins in southern South America, but ... more Pseudechinus magellanicus is one of the most abundant sea urchins in southern South America, but many aspects of its feeding ecology in nearshore environments remain unknown. Here, we aimed to analyze the variability of the diet composition along a coastal depth gradient from intertidal tidepools to upper circalittoral zones and examine the relation between seaweed availability and the diet composition at intertidal tidepools. A total of 118 food items, including seaweeds and animal components, were identified. The diet composition showed a large variation between the different coastal habitats present along the depth gradient studied. In tidepools, articulate coralline seaweeds (Corallina spp.), mussel shell fragments and small crustaceans were frequent in the gut contents, suggesting that this species behaves like a general omnivore but can also act as a mussel bioeroder when consuming epizoic algae and microeuendolithic organisms. In intertidal tidepools, the species showed a neg...
Anasterias minuta is an abundant brooding sea star inhabiting tidepool habitats and mussel beds o... more Anasterias minuta is an abundant brooding sea star inhabiting tidepool habitats and mussel beds of Perumytilus purpuratus in Patagonia, Argentina. This study explores the inluence of mussel bed complexity and tidal height on the size distribution of A. minuta living under mussel beds, and compares the abundance, reproduction, and condition indices in contrasting intertidal microhabitats (mussel hummocks and tidepools). Distribution patterns in mussel beds were explored at four sites along the coast of Argentina (45.4°S–47.4°S) during the austral spring, 2012/2017. Microhabitat comparisons were done at Caleta
Cordova Norte between May 2004 and June 2005. Abundance inside mussel beds was correlated positively with mussel bed thickness and presence of mussel hummocks, and negatively with tidal height. Within mussel beds, early juveniles (recruits) and juveniles (greatest radius R < 15 mm) were generally restricted to low-tidal heights, while adults (R ≥ 15 mm) extended to mid-tidal levels. Sea stars were more abundant and larger in tidepools than under mussel beds. Numbers of recruits and juveniles increased signiicantly under mussel hummocks during austral spring and summer, coinciding with the release and subsequent growth of early juveniles. Brooding and gonadal cycles were synchronized between the microhabitats; however, the brooding cycle was nearly 2 months shorter under mussel hummocks (April–August) than in tidepools (April–October). The sea stars under mussels were smaller, had a less developed body wall, and greater gonadal production, indicating that more energy was allocated to reproduction compared to sea stars of similar size from tidepools. Further studies are needed to identify the speciic environmental conditions that led to the observed adaptations and to understand the underlying physiological mechanisms.
Marine Biology, Jul 30, 2011
Revista De Biologia Tropical, 2008
Aquatic Ecology, Mar 7, 2021
Marine Pollution Bulletin, 2020
Invertebrate Reproduction & Development, Nov 14, 2014
ABSTRACT This study reports nutrient allocation in different stages of gonadal development for tw... more ABSTRACT This study reports nutrient allocation in different stages of gonadal development for two populations of the sea urchin Arbacia dufresnii off the Patagonian coast of Argentina (Nuevo Gulf and San Jorge Gulf). The biochemical composition of gonads was used to assess nutrient allocation by measuring ash, soluble protein, lipid and trichloroacetic acid-soluble carbohydrate concentrations, and absolute contents over a 24-month period. Reproductive output in terms of energy was calculated for females. Results were correlated with istological stage of the gonads. Soluble proteins were the main component for the Nuevo Gulf population while unmeasured organic material (i.e. insoluble proteins and nucleic acids, especially in testes) was revalent in gonads from San Jorge Gulf. Soluble protein and lipid concentrations followed the gonadal cycle, while carbohydrate concentration was almost negligible, especially in the Nuevo Gulf population. The different patterns in the gonadal cycle in the two populations were reflected in the biochemical composition of gonads. Concentrations and contents of the biochemical components and reproductive output were higher in the population from San Jorge Gulf owing to the larger size of gonads and gametes. These findings contribute to the better understanding of the plasticity of the reproductive biology of A. dufresnii in different environments.
Marine and Freshwater Research, 2015
Springer eBooks, Aug 4, 2012
Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at... more Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at the Argentine Museum of Natural Sciences ''Bernardino Rivadavia''(MACN), who dedicated 55 years of her life to study the echinoderms inhabiting the Argentine Sea. Her first studies were focused on Echinoidea of Tierra del Fuego (54 S, 68 W) and Ophiuroidea and Crinoidea of South Georgia islands. In 1924, she published the first work with pictures and drawings of the most common sea urchins (Bernasconi 1924). In 1935, she published ...
Marine Biology Research, 2020
Invertebrate Biology, 2020
Marine Biology, Aug 7, 2018
Invertebrate Reproduction & Development, 2014
ABSTRACT This study reports nutrient allocation in different stages of gonadal development for tw... more ABSTRACT This study reports nutrient allocation in different stages of gonadal development for two populations of the sea urchin Arbacia dufresnii off the Patagonian coast of Argentina (Nuevo Gulf and San Jorge Gulf). The biochemical composition of gonads was used to assess nutrient allocation by measuring ash, soluble protein, lipid and trichloroacetic acid-soluble carbohydrate concentrations, and absolute contents over a 24-month period. Reproductive output in terms of energy was calculated for females. Results were correlated with istological stage of the gonads. Soluble proteins were the main component for the Nuevo Gulf population while unmeasured organic material (i.e. insoluble proteins and nucleic acids, especially in testes) was revalent in gonads from San Jorge Gulf. Soluble protein and lipid concentrations followed the gonadal cycle, while carbohydrate concentration was almost negligible, especially in the Nuevo Gulf population. The different patterns in the gonadal cycle in the two populations were reflected in the biochemical composition of gonads. Concentrations and contents of the biochemical components and reproductive output were higher in the population from San Jorge Gulf owing to the larger size of gonads and gametes. These findings contribute to the better understanding of the plasticity of the reproductive biology of A. dufresnii in different environments.
Echinoderm Research and Diversity in Latin America, 2012
Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at... more Echinoderm research in Argentina began with Professor Irene Bernasconi (1896–1989; Fig. 11.1), at the Argentine Museum of Natural Sciences ''Bernardino Rivadavia''(MACN), who dedicated 55 years of her life to study the echinoderms inhabiting the Argentine Sea. Her first studies were focused on Echinoidea of Tierra del Fuego (54 S, 68 W) and Ophiuroidea and Crinoidea of South Georgia islands. In 1924, she published the first work with pictures and drawings of the most common sea urchins (Bernasconi 1924). In 1935, she published ...
Echinoderm Research and Diversity in Latin America, 2012
The reproductive cycle of the sub-Antarctic spatangoid sea urchin, Abatus cavernosus, was examine... more The reproductive cycle of the sub-Antarctic spatangoid sea urchin, Abatus cavernosus, was examined during a two-year period in southern Patagonia, Argentina. The population studied is the northernmost known coastal population in the austral oceans, and is influenced by a greater annual range of seawater temperature than other Abatus species. The sex ratio of the overall A. cavernosus population did not differ significantly from 1: 1, but was not homogeneous across size classes. A clearly defined annual reproductive cycle ...
Aquatic Ecology, 2021
Pseudechinus magellanicus is one of the most abundant sea urchins in southern South America, but ... more Pseudechinus magellanicus is one of the most abundant sea urchins in southern South America, but many aspects of its feeding ecology in nearshore environments remain unknown. Here, we aimed to analyze the variability of the diet composition along a coastal depth gradient from intertidal tidepools to upper circalittoral zones and examine the relation between seaweed availability and the diet composition at intertidal tidepools. A total of 118 food items, including seaweeds and animal components, were identified. The diet composition showed a large variation between the different coastal habitats present along the depth gradient studied. In tidepools, articulate coralline seaweeds (Corallina spp.), mussel shell fragments and small crustaceans were frequent in the gut contents, suggesting that this species behaves like a general omnivore but can also act as a mussel bioeroder when consuming epizoic algae and microeuendolithic organisms. In intertidal tidepools, the species showed a neg...
Anasterias minuta is an abundant brooding sea star inhabiting tidepool habitats and mussel beds o... more Anasterias minuta is an abundant brooding sea star inhabiting tidepool habitats and mussel beds of Perumytilus purpuratus in Patagonia, Argentina. This study explores the inluence of mussel bed complexity and tidal height on the size distribution of A. minuta living under mussel beds, and compares the abundance, reproduction, and condition indices in contrasting intertidal microhabitats (mussel hummocks and tidepools). Distribution patterns in mussel beds were explored at four sites along the coast of Argentina (45.4°S–47.4°S) during the austral spring, 2012/2017. Microhabitat comparisons were done at Caleta
Cordova Norte between May 2004 and June 2005. Abundance inside mussel beds was correlated positively with mussel bed thickness and presence of mussel hummocks, and negatively with tidal height. Within mussel beds, early juveniles (recruits) and juveniles (greatest radius R < 15 mm) were generally restricted to low-tidal heights, while adults (R ≥ 15 mm) extended to mid-tidal levels. Sea stars were more abundant and larger in tidepools than under mussel beds. Numbers of recruits and juveniles increased signiicantly under mussel hummocks during austral spring and summer, coinciding with the release and subsequent growth of early juveniles. Brooding and gonadal cycles were synchronized between the microhabitats; however, the brooding cycle was nearly 2 months shorter under mussel hummocks (April–August) than in tidepools (April–October). The sea stars under mussels were smaller, had a less developed body wall, and greater gonadal production, indicating that more energy was allocated to reproduction compared to sea stars of similar size from tidepools. Further studies are needed to identify the speciic environmental conditions that led to the observed adaptations and to understand the underlying physiological mechanisms.