Ecología trofica de dos estrellas de mar del genero<i>Astropecten</i>coexistentes en Golfo Triste, Venezuela∗

Bitter, Ricardo; Penchaszadeh, Pablo E.

doi:10.1080/01650528309360629

Cited by 6 publications

(9 citation statements)

References 2 publications

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“…Since this group has intraoral feeding (Jangow, 1982), the analysis of stomach contents can provide valuable information on both its diet and feeding activity. Seasonal changes in the diet of Astropecten species are related to the availability of prey and to the selective behaviour of asteroids (Bitter and Penchaszadeh, 1983;Nojima, 1989;Beddingfield and McClintock, 1993). The diet of these species includes mainly bivalves, gastropods and small crustaceans (Christensen, 1970;Ribi et al, 1977;Ventura, 199 1).…”

Section: Introductionmentioning

confidence: 99%

Reproductive cycle and feeding periodicity in the starfishAstropecten brasiliensisin the Cabo Frio upwelling ecosystem (Brazil)

Ventura

Falcão²,

Santos³

et al. 1997

Invertebrate Reproduction & Development

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Monthly collections ofAstropecten brasiliensis were made at depths of 30 and 45 m. The highest number of prey in the stomach occured in summer in both 1987 and 1988. Specimens larger than 4 cm in radius had mature gonads. The reproductive cycle was determined by gonad indices and histological analysis of gonads. In 1988, the species exhibited an annual reproductive cycle with spawning in December. The pyloric caecum indices showed the highest values between April and July. The relationship between gonad index and pyloric caecum index was inverse. The pyloric caecum peak occurred during the downwelling period (fall and winter) when warm tropical waters (Brazil Current) were inshore. The reproductive peak coincided with the upwelling period (during spring and summer) enabling the larvae to benefit fiom the richer water condition when phytoplankton are more abundant.

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Section: Introductionmentioning

confidence: 99%

Reproductive cycle and feeding periodicity in the starfishAstropecten brasiliensisin the Cabo Frio upwelling ecosystem (Brazil)

Ventura

Falcão²,

Santos³

et al. 1997

Invertebrate Reproduction & Development

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“…Astropecten marginatus Gray 1840 es una estrella de mar perteneciente a la Clase Asteroidea, Orden Paxillosida y Familia Astropectinidae. El género Astropecten está distribuido en aguas tropicales y subtropicales; habitando en su mayoría en sustratos arenosos y arenofangosos (Lera 1980, Bitter & Penchaszadeh 1983, Bitter 2000.…”

unclassified

“…Las estrellas del género Astropecten presentan digestión intraoral y no evierten el estómago como la mayoría de los asteroideos, careciendo de mecanismos para triturar su alimento, por lo que deben ingerir sus presas enteras y digerirlas internamente. Esta característica permite que se pueda conocer su dieta analizando el contenido estomacal del individuo (Lera 1980, Bitter & Penchaszadeh 1983, Vala 2005, Caregnato et al 2009. Muchos asteroideos han sido catalogados como carnívoros, y su depredación juega un papel importante en la estructura y función de las comunidades marinas bentónicas, llegando a ingerir incluso otros equinodermos (Hendler et al 1995, Ganmanee et al 2003, Vala 2005, Caregnato et al 2009).…”

unclassified

Distribución, parámetros poblacionales y dieta de Astropecten marginatus (Asteroidea: Astropectinidae) en el Atlántico venezolano

Ortega¹,

Martín²,

Díaz³

2009

RBT

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Distribution, population parameters, and diet of Astropecten marginatus (Asteroidea: Astropectinidae) in the Venezuelan Atlantic coast. Astropecten marginatus is a sea star widely distributed in Northern and Eastern South America, found on sandy and muddy bottoms, in shallow and deep waters. To describe some of its ecological characteristics, we calculated it spatial-temporal distribution, population parameters (based on size and weight) and diet in the Orinoco Delta ecoregion (Venezuela). The ecoregion was divided in three sections: Golfo de Paria, Boca de Serpiente and Plataforma Deltana. Samples for the rainy and dry seasons came from megabenthos surveys of the "Línea Base Ambiental Plataforma Deltana (LBAPD)" and "Corocoro Fase I (CFI)" projects. The collected sea stars were measured, weighted and dissected by the oral side to extract their stomach and identify the preys consumed. A total of 570 sea stars were collected in LBAPD project and 306 in CFI one. The highest densities were found during the dry season in almost all sections. In LBAPD project the highest density was in "Plataforma Deltana" section (0.007±0.022ind/m 2 in dry season and 0.014±0.06ind/m 2 in rainy season) and in the CFI project the densities in "Golfo de Paria" section were 0.705±0.829ind/m 2 in rainy season and 1.027±1.107ind/m 2 in dry season. The most frequent size range was 3.1-4.6cm. The highest biomass was found in "Golfo de Paria" section (7.581±0.018mg/m 2 in dry season and 0.005±6.542x10 -06 mg/m 2 in rainy season for 2004-2005 and 3.979±4.024mg/m 2 in dry season; and 3.117±3.137mg/m 2 in rainy season for 2006). A linear relationship was found between the sea star size and its weight but no relationship was observed between its size and the depth where it was collected. Mollusks are dominant in the sea star diet (47.4% in abundance). The diet in any of the sections, seasons or between projects or size class was heterogeneous, using multivariate ordinations (MDS) and SIMPER analysis and there was no difference in the prey number or food elements that a sea star can eat. Although A. marginatus has been described as a predator, in this study were also inferred scavenger and detritivorous habits.

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“…This genus is exclusively carnivorous and an active predator with a generalist diet, and has negative effects on the density of its prey (Jangoux, 1982). These organisms are able to find and capture their preferred prey buried into the sediment (Wells, Wells, & Gray, 1961;Bitter & Penchaszadeh, 1983). The selectivity of its prey is influenced by several factors such as the prey size, which depends on its body size and constraints imposed by the mechanism of intraoral digestion (Ventura, Grillo, & Fernandes, 2001).…”

mentioning

confidence: 99%

“…Members of the family Astropectinidae, including the genus Astropecten (Gray, 1840), inhabit tropical, subtropical and temperate waters (Bitter & Penchaszadeh, 1983;Soto, 2000;Loh & Todd, 2011). This genus is exclusively carnivorous and an active predator with a generalist diet, and has negative effects on the density of its prey (Jangoux, 1982).…”

mentioning

confidence: 99%

Variaciones estacionales en el tamaño corporal y dieta de la estrella de mar Astropecten marginatus (Paxillosida, Astropectinidae) frente a la costa de Paraná, sur de Brasil

Guilherme

2013

RBT

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Abstract:The sea star Astropecten marginatus has a neotropical distribution and is a highly abundant and frequent species in shrimp trawling by-catchin many places along the Brazilian coast. This has caused its threat to extinction and in addition, its bio-ecological aspects are poorly known. Thus, the main objective of this study was to analyze the seasonal variations of population length structure and feeding habits of the sea stars A. marginatus inhabiting off state of Paraná, Southern Brazil. The analyzed specimens were collected in February (summer), April (fall), June (winter) and October (spring) of 2008 from shrimp by-catch trawling. in the laboratory, each individual had its length measured and then weighed on an analytical scale. Afterwards, the stomach contents of 10 individuals of each of two most frequent length classes were seasonally analyzed. The relative frequency and abundance for each prey category was determined and, then combined into an index of alimentary importance. A total of 994 individuals of A. marginatus were collected with length ranging from 7.0 to 56.2mm, but most individuals were in the 20.1-25mm length classes. individuals larger than 40mm were only collected in the spring while a few recruits (<10mm) were found in fall and winter. The total weight of individuals ranged from 0.1 to 15.3g and the weight-length relationships showed a negative allometric growth (b<2.54). Regarding its food consumption, this sea star explored eleven food items, with cumaceans and mollusks as the most frequent items. High frequency of empty stomach was recorded at fall. Seasonal differences in the amount explored preys and ingested items as well as in the prey composition were also observed. Higher amount of explored prey categories and ingested items were recorded at winter-spring than summer-fall periods. Predominance in prey category changed from gastropods (summer and fall) to cumaceans (winter and spring). The importance of gastropods as main prey category at summer and fall should be carefully considered since it was coincidently observed with high frequency of empty stomach and low amount of ingested items. The observed seasonal differences in feeding behavior pattern were mainly associated to low prey availability and to changes in the sea star feeding rates, and probably reflected in some biological traits such as small body size of the population inhabiting waters off the Paraná coast, Southern Brazil. Rev. Biol. Trop. 62 (1): 59-68. Epub 2014 March 01.

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Ecología trofica de dos estrellas de mar del generoAstropectencoexistentes en Golfo Triste, Venezuela∗

Cited by 6 publications

References 2 publications

Reproductive cycle and feeding periodicity in the starfishAstropecten brasiliensisin the Cabo Frio upwelling ecosystem (Brazil)

Reproductive cycle and feeding periodicity in the starfishAstropecten brasiliensisin the Cabo Frio upwelling ecosystem (Brazil)

Distribución, parámetros poblacionales y dieta de Astropecten marginatus (Asteroidea: Astropectinidae) en el Atlántico venezolano

Variaciones estacionales en el tamaño corporal y dieta de la estrella de mar Astropecten marginatus (Paxillosida, Astropectinidae) frente a la costa de Paraná, sur de Brasil

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