Comparative morphology of the first zoea of twelve brachyuran species (Crustacea: Decapoda) from the Amazon region

Souza, Adelson Silva de; Costa, Roberto Cezar Lobo da; Abrunhosa, Fernando Araújo

doi:10.1590/s1984-46702013000300004

Cited by 5 publications

(3 citation statements)

References 46 publications

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“…A Folsom type sample splitter was used to divide each 1 L plankton sample, with a 250 mL subsample being obtained for analysis, which contained representatives of all the larval taxa contained in the whole sample. The larvae were separated from the zooplankton samples, analyzed under a Zeiss optic microscope, dissected, and identified based on the studies of Brossi-Garcia and Rodrigues (1993) and Souza et al (2013). The larval vouchers were deposited in the Museu Paraense Emílio Goeldi (MPEG).…”

Section: Collection Of Larvaementioning

confidence: 99%

Spatio-temporal variation of the population structure and density of the shore crab Pachygrapsus gracilis (Grapsidae) in an estuary on the Brazilian Amazon coast

et al. 2021

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The present study investigates the spatio-temporal variation in the density of the adults and larvae of the shore crab Pachygrapsus gracilis and identifies the reproductive period and the population structure of the species in the Marapanim estuary, in northern Brazil, in order to describe the biological characteristics of this equatorial population on the Atlantic coast. Specimens were collected manually every month over the course of a year. Adults were collected at four rocky outcrops in the upper and lower mid-littoral. Larvae were sampled at six points using horizontal trawls of the surface water. The sampling points represent the inner and outer estuary, its two margins, and varying gradients of salinity. The density of the zoea I and adults were higher on the margins with the highest sediment deposition rates and salinity. Only the density of the adults correlated significantly with salinity. Although ovigerous females were only collected in the rainiest periods, the presence of juveniles throughout the year indicates that the species reproduces continuously. The population parameters indicate that the density of P. gracilis was related to salinity, and that part of the life cycle of these crabs is completed in the Marapanim estuary. This species reproduces in the estuary, exports zoea I to the coastal waters and then probably returns as megalopae, responding to local conditions through systematic shifts in its distribution and abundance over time and space. The population was relatively stable and able to adjust to the considerable variation in abiotic factors that are typical of this estuary.

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Section: Collection Of Larvaementioning

confidence: 99%

Spatio-temporal variation of the population structure and density of the shore crab Pachygrapsus gracilis (Grapsidae) in an estuary on the Brazilian Amazon coast

et al. 2021

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“…In the laboratory, the samples were fractionated into 250 mL aliquots with a Folsom-type subsample. All brachyuran larvae in the aliquots were dissected and identified to the lowest taxonomic level possible [1,[45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] by observing the morphological parameters, such as the arrangement and number of spines and setae in the antennae, antennules, maxilliped, maxilla, abdomen, and telson, under an Axioscope Zeiss A1 optical microscope (Carl Zeiss, Oberkochen, Germany). The recent taxonomy was checked in the World Register of Marine Species [http://www.marinespecies.org].…”

Section: Data Collectionmentioning

confidence: 99%

Larval dispersal of Brachyura in one of the largest estuarine/marine systems in the world

et al. 2022

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The Amazon Continental Shelf (ACS) is a complex habitat that receives a large annual freshwater discharge into the ocean, producing a superficial plume and carrying with it large amounts of nutrients to the continental shelf along thousands of kilometers while sustaining high biodiversity in the estuary–ocean continuum. For the first time, this study monitored six sites in a wide transect with approximately 240 km radius on the ACS every 2–4 months. The objectives were (1) to analyze the composition of larval Brachyuran crabs and (2) to predict the importance of environmental parameters (temperature, salinity and chlorophyll-a) in structuring their abundance. A total of 17,759 larvae identified were distributed in 8 families and 24 taxa. The water salinity was the best predictor of larval distribution. The statistical models used indicated that Panopeidae and Portunidae larvae are more frequent and more likely to occur in shallow water layers, while Calappidae occur in deeper layers, and Grapsidae, Ocypodidae, Sesarmidae, Pinnotheridae and Leucosiidae occur similarly in both strata. The larval dispersal extent varies among families and throughout the year while the groups are distributed in different salinities along the platform. The probability of occurrence of Portunidae is higher in ocean water (≥ 33.5); Grapsidae, Panopeidae, and Pinnotheridae is higher in intermediate and ocean salinity waters (25.5 to 33.5); Ocypodidae, Sesarmidae and Calappidae is higher in estuarine and intermediate salinity waters (5 to 25.5), whereas Leucosiidae, euryhaline, occur in all salinities (5 to 33.5). Furthermore, the Amazon River seasonal flow and plume movement throughout the year not only regulate the larval distribution and dispersion of estuarine species but are also fundamental for the ACS species, providing the necessary nutrient input for larval development in the region.

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“…In the laboratory, the samples were fractionated into 250 mL aliquots with a Folsom-type subsample. All Brachyura larvae in the aliquots were dissected and identified to the lowest taxonomic level possible by observing the morphological parameters, such as the arrangement and number of spines and setae in the antennae, antennules, maxilliped, maxilla, abdomen, and telson, under an Axioscope Zeiss A1 optical microscope (Carl Zeiss, Oberkochen, Germany) [44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60]. The recent taxonomy was checked in the World Register of Marine Species…”

Section: Data Collectionmentioning

confidence: 99%

Larval dispersal of Brachyura in the largest estuarine / marine system in the world

Lima

Butturi-Gomes

et al. 2021

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For the first time, this study monitored six sites in a wide transect with approximately 240 km radius on the Amazon Continental Shelf (ACS) every three months. The objective was to analyze the larval composition of Brachyura, its abundance in shallow/subsurface and oblique hauls, the extent of larval dispersion related to the estuary/plume, and to predict the probability of occurrence and abundance for the temperature, salinity, and chlorophyll- a profiles of the water column. A total of 17,759 identified larvae are distributed in 8 families and 25 taxa. The water salinity was the best predictor of larval distribution. The statistical models used indicated that Panopeidae and Portunidae larvae are more frequent and more likely to occur in shallow water layers, while Calappidae occur in deeper layers, and Grapsidae, Ocypodidae, Sesarmidae, Pinnotheridae and Leucosiidae occur similarly in both strata. The larval dispersion extent varies among families and throughout the year while the groups are distributed in different salinities along the platform. The probability of occurrence of Portunidae is higher in ocean water (> = 33.5); Grapsidae, Panopeidae, and Pinnotheridae is higher in intermediate and ocean salinity waters (25.5 to 33.5); Ocypodidae, Sesarmidae and Calappidae is higher in estuarine and intermediate salinity waters (5 to 25.5), whereas Leucosiidae, euryhaline, occur in all salinities (5 to 33.5). Furthermore, the Amazon River seasonal flow and plume movement throughout the year not only regulate the larval distribution and dispersion of estuarine species but are fundamental for the ACS species, providing the necessary nutrient input for larval development in the region plankton.

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Comparative morphology of the first zoea of twelve brachyuran species (Crustacea: Decapoda) from the Amazon region

Cited by 5 publications

References 46 publications

Spatio-temporal variation of the population structure and density of the shore crab Pachygrapsus gracilis (Grapsidae) in an estuary on the Brazilian Amazon coast

Spatio-temporal variation of the population structure and density of the shore crab Pachygrapsus gracilis (Grapsidae) in an estuary on the Brazilian Amazon coast

Larval dispersal of Brachyura in one of the largest estuarine/marine systems in the world

Larval dispersal of Brachyura in the largest estuarine / marine system in the world

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