Shelf-life of cooked meat of southern king crab (Lithodes santolla) and false king crab (Paralomis granulosa) during refrigerated storage.

Lithodes santolla (SKC) and Paralomis granulosa (FSKC) are economically important resources exploited in southern South America. The effect of refrigerated storage (4 °C on flake ice) on physico-chemical (pH, thiobarbituric reactive substances (TBARs), total volatile basic nitrogen (TVB-N), water holding capacity (WHC), and water content (WC)), microbiological (total viable mesophilic bacteria (TVMC), psychrotrophic bacteria (TVPC), Staphylococcus spp, coliforms, enterobacteria, molds and yeasts) and sensory (odor, appearance, texture, juiciness, and taste) parameters was analyzed in the cooked SKC and FSKC merus. For each species, cooked merus from 36 animals were randomly distributed into 6 groups, corresponding to 0, 2, 5, 8, 11, and 14 days of storage. On each day, samples were taken for physico-chemical (n = 6), microbiological (n = 3), and sensory (n = 15) analyses. The pH values increased over time (P < 0.01 in both species), the TBARs only increased in FSKC (P = 0.008), whereas the TVB-N significantly rose only in SKC (P = 0.001). The WHC and the WC did not change over time for any of the king crab species (P > 0.05) in all cases. The presence of TVCM, TVCP, and Staphylococcus spp. in both species was observed from day 0. Furthermore, pathogenic microorganisms (S. aureus, coliforms, and enterobacteria) were not detected, and only the TVCP in SFKC reached the suggested microbial limit after 11 days. All sensory scores significantly decreased (P < 0.001) over time, but the quality of both king crab species remained acceptable until the 11th day. These findings suggest that the shelf-life of cooked merus was 11 and 8 days for SKC and SFKC, respectively, when stored at 4 °C with the presence of flake ice. These contributions consist of elucidating the shelf-life of these economically important seafood products and providing insights into their quality maintenance during storage.

Non-predatory mortality assessment of zooplankton in Magdalena Bay, Mexico, during El Niño 2015.

During 2015, monthly zooplankton sampling and measurements of surface temperature (SST), salinity, dissolved oxygen and chlorophyll a were conducted. Collections were made during neap tides at four locations between the inner and near the mouth of Magdalena Bay, Mexico. Thirty-three taxonomic groups were identified, and the most abundant taxa were copepods, diplostracans, decapods, ichthyoplankton (fish eggs), and chaetognaths. Zooplankton abundance did not vary significantly over time but did vary between sampling stations. SST and salinity were significantly correlated with the spatial distribution of organisms. Differences were found between the mortality percentages for the sampling stations and also for the taxonomic groups analyzed (Copepods 18%; Decapods 32%; Chaetognaths 33%), which implies the importance of carrying out mortality determination analyses in ecological studies of zooplankton.

Brazilian Miocene crabs I. Taxonomic review of Cyclocancer tuberculatus Beurlen, 1958 and Hepatella amazonica Beurlen, 1958 (Pancrustacea, Decapoda, Brachyura)

In describing Cyclocancer to accommodate his new species C. tuberculatus, Beurlen highlighted that his new genus was a cancroid intermediate in form between Atelecyclus and Cancer, but with enough characters to be placed in a new genus. Examination of C. tuberculatus type material revealed that Cyclocancer is a junior synonym of Hepatus. Therefore, C. tuberculatus is herein transferred into Hepatus as H. beurleni nomen novum because H. tuberculatus (Beurlen, 1958) is a junior homonym of H. tuberculatusSaussure (1858), a junior synonym of Hepatus pudibundus (Herbst, 1785). Miohepatus gen. nov., comb. nov. is proposed here to accommodate Hepatella amazonica Beurlen from the Pirabas Formation, Neogene, Pará, Brazil, based on new morphological evidence from the type material.(AU)

Toward a More Comprehensive View of α-Amylase across Decapods Crustaceans.

Decapod crustaceans are a very diverse group and have evolved to suit a wide variety of diets. Alpha-amylases enzymes, responsible for starch and glycogen digestion, have been more thoroughly studied in herbivore and omnivore than in carnivorous species. We used information on the α-amylase of a carnivorous lobster as a connecting thread to provide a more comprehensive view of α-amylases across decapods crustaceans. Omnivorous crustaceans such as shrimps, crabs, and crayfish present relatively high amylase activity with respect to carnivorous crustaceans. Yet, contradictory results have been obtained and relatively high activity in some carnivores has been suggested to be a remnant trait from ancestor species. Here, we provided information sustaining that high enzyme sequence and overall architecture conservation do not allow high changes in activity, and that differences among species may be more related to number of genes and isoforms, as well as transcriptional and secretion regulation. However, recent evolutionary analyses revealed that positive selection might have also occurred among distant lineages with feeding habits as a selection force. Some biochemical features of decapod α-amylases can be related with habitat or gut conditions, while less clear patterns are observed for other enzyme properties. Likewise, while molt cycle variations in α-amylase activity are rather similar among species, clear relationships between activity and diet shifts through development cannot be always observed. Regarding the adaptation of α-amylase to diet, juveniles seem to exhibit more flexibility than larvae, and it has been described variation in α-amylase activity or number of isoforms due to the source of carbohydrate and its level in diets, especially in omnivore species. In the carnivorous lobster, however, no influence of the type of carbohydrate could be observed. Moreover, lobsters were not able to fine-regulate α-amylase gene expression in spite of large changes in carbohydrate content of diet, while retaining some capacity to adapt α-amylase activity to very low carbohydrate content in the diets. In this review, we raised arguments for the need of more studies on the α-amylases of less studied decapods groups, including carnivorous species which rely more on dietary protein and lipids, to broaden our view of α-amylase in decapods crustaceans.

Spatial structure and morphometric relationships of the deep-sea shrimp Solenocera acuminata (Decapoda, Solenoceridae) in the Colombian Caribbean.

Given the potential interest in targeting Solenocera acuminata in a new deep-sea fishery in the Colombian Caribbean, biological information is needed to support the management of this species. The objective of this study is to provide biological information about size structure, size at sexual maturity, morphometric relationships, abundances and spatial and bathymetric distribution of S. acuminata in the Colombian Caribbean. Specimens of S. acuminata were collected during four deep-sea prospecting surveys in the Colombian Caribbean Sea, which were conducted between Punta Gallinas and the Gulf of Uraba. A total of 87 exploratory fishing trawls were made between 100 and 550 m depth. Sexual dimorphism was evident, with males being smaller than females. The size at sexual maturity of the females was 95.2 mm total length (23.82 mm CL). Relatively high biomass values were found in the northern zone of the Colombian Caribbean, between Santa Marta and Riohacha. In the southern zone, higher biomass was found between Cartagena and Morrosquillo Gulf. The biomass of S. acuminata was higher at night (mean 1.82 kg/km2) than during daylight (mean 0.15 kg/km2). This species was distributed between 150 and 400 m depth and the highest biomass was associated with depths between 330 and 380 m. Before starting a new fishery, more research is needed to understand the life cycle parameters of deep-sea resources, such as growth, reproduction, recruitment, mortality, spawning areas and times, nursery areas and associated biodiversity.

Effects of Chlorpyrifos Over Reproductive Traits of Three Sympatric Freshwater Crustaceans.

The exposure to environmentally relevant chlorpyrifos concentrations (0.03, 0.06 and 0.12 µg chlorpyrifos L-1) causes increases in precopulatory guardian behavior time, amplexus reformulation after exposure and in the number of ovigerous females in the amphipod Hyalella curvispina. Effects in incubation period, effective hatching and median lethal concentration on the decapods Macrobrachium borellii and Aegla uruguayana, both in adults and embryos, were achieved at higher concentrations than those found in the environment. Environmentally relevant chlorpyrifos concentrations appear not to affect decapods but several effects in reproductive traits of amphipods were observed.

Designation of a neotype for Parastacus nicoleti (Philippi, 1882) (Crustacea: Decapoda: Parastacidae).

The type specimen of Parastacus nicoleti (Philippi, 1882) was not designated and the material used for the description has never been found. We designate herein the neotype of P. nicoleti based on the examination of specimens from the type locality deposited in the Museo Nacional de Historia Natural of Chile previously analyzed by Bahamonde (1958), who confirmed the identity and validated the species. To improve the species description we included new drawings and provide additional morphological characters. A synonym list and updated distribution map of this species are also provided.

Molecular perspective on the American transisthmian species of Macrobrachium (Caridea, Palaemonidae).

The closure of the Isthmus of Panama (about 3.1 million years ago) separated previously continuous populations and created two groups of extant species, which live now in the Pacific and Atlantic drainage systems. This relatively recent event was a trigger to diversification of various species in the Neotropics, nonetheless there are exemplars that do not show sufficient morphologic variability to separate them by traditional morphological tools. About 60 years ago, some freshwater decapod species with high morphological similarity were separate by previous researchers, based on geographical distribution, in Pacific and Atlantic and considered as "sister species". However, the complete isolation of these prawns by this geographical barrier is questionable, and it has generated doubts about the status of the following transisthmian pairs of sibling species: Macrobrachiumoccidentale × Macrobrachiumheterochirus, Macrobrachiumamericanum × Macrobrachiumcarcinus, Macrobrachiumdigueti × Macrobrachiumolfersii, Macrobrachiumhancocki × Macrobrachiumcrenulatum, Macrobrachiumtenellum × Macrobrachiumacanthurus and Macrobrachiumpanamense × Macrobrachiumamazonicum. Here we evaluated the relation among these pairs of sibling species in a molecular phylogenetic context. We generated 95 new sequences: 26 sequences of 16S rDNA, 25 of COI mtDNA and 44 of 18S nDNA. In total, 181 sequences were analyzed by maximum likelihood phylogenetic method, including 12 Macrobrachium transisthmian species, as well as seven other American Macrobrachium species, and two other palaemonids. Our analysis corroborated the morphological proximity of the sibling species. Despite the high degree of morphological similarities and considerable genetic diversification encountered among the transisthmian sister species, our data support the conclusion that all species included in sibling groups studied herein are valid taxonomic entities, but not all pairs of siblings form natural groups.

Suscetibilidade dos estágios ontogenéticos: padrão osmorregulatório em camarões peneídeos e palemonídeos / Susceptibility of ontogenetic stages: osmoregulatory standard in penaeid and palaemonid shrimps / Susceptibilidad de etapas ontogenéticas: estándar osmorregulatorio en camarones peneídeos y palemonídeos

A invasão da água doce por crustáceos ocorreu repetidamente ao longo dos anos, pressionando um ajuste em seus processos fisiológicos. A habilidade de sobreviver aos diferentes ambientes foi encontrada em traços osmorregulatórios, e estão relacionadas à capacidade de regular o fluido extracelular. Portanto, o objetivo deste manuscrito é explorar os processos osmorregulatórios de camarões palemonídeos e peneídeos, visualizando um padrão na capacidade osmorregulatória em ambas as famílias e, em particular, tratar de assuntos pertinentes aos efeito no ciclo ontogenético e o efeito ocasionado pelo nitrito na hemolinfa de crustáceos. Comparando palemonídeos e peneídeos, percebe-se que o sucesso da conquista do ambiente dulcícola, e a não necessidade de hiporregulação, levou à perda dessa capacidade na maioria dos palemonídeos. Dessa forma, se supõem um ancestral com capacidade hiporregulatória, uma vez que invertebrados marinhos são, parcimoniosamente, osmoconformadores. Compara-se também que o nitrito apresenta efeito nas proteínas presentes na hemolinfa dos crustáceos quando submetidos à exposição natural ou induzida deste composto, e que a capacidade osmorregulatória é, portanto, variada de acordo com seus estágios.(AU)

The invasion of freshwater by crustaceans has occurred repeatedly over the years, pressing for an adjustment in their physiological processes. The ability to survive in different environments was found in osmoregulatory traits and is related to the ability to regulate the extracellular fluid. Therefore, the purpose of this manuscript is to explore the osmoregulatory processes in palaemonid and penaeid shrimps, which display a pattern of osmoregulatory capacity in both families and, in particular, to deal with matters related to the effects on ontogenetic cycle and the effect raised by nitrite in crustacean hemolymph. By comparing palaemonid and peneid shrimps, it is possible to note the success of conquering freshwater environment, and not the need for hypo-regulation, has led to the loss of this capability in most palaemonids. Thus, it is assumed that they share an ancestor with hypo-regulatory capacity, since marine invertebrates are sparsely osmoconformers. The article also compares that nitrite has effect on proteins present in the hemolymph of crustaceans when subjected to natural or induced exposure to these compound, and osmoregulatory capacity is therefore varied according to their stages.(AU)

La invasión del agua dulce por crustáceos ocurre repetidamente a lo largo de los años, pulsando un ajuste en sus procesos fisiológicos. La capacidad de sobrevivir en diferentes ambientes se ha encontrado en rasgos osmorregulatorios y están relacionados a la capacidad de regular el fluido extracelular. Por lo tanto, el objetivo de este manuscrito es el de explotar los procesos osmorregulatorios de camarones palemonídeos y peneídeos, se muestra un estándar en la capacidad osmorregulatoria en ambas las familias y, en especial, trata de cuestiones relativas a los efectos sobre los ciclo ontogenético y el efecto causado por nitrito en la hemolinfa de crustáceos. Comparando palemonídeos y peneídeos, se da cuenta de que el éxito de la conquista del ambiente dulcícola, y sin necesidad de hipo regulación, condujo a la pérdida de esa capacidad en la mayoría de los palemonídeos. Así, se supone un ancestral con capacidad hipo regulatoria, una vez que los invertebrados marinos son, parsimoniosamente, osmoconformadores. Se compara también que el nitrito presenta efectos en las proteínas presentes en la hemolinfa de los crustáceos cuando sometidos a la exposición natural o inducida por estes compuesto, y que la capacidad osmorregulatoria es, por lo tanto, variada de acuerdo con sus etapas.(AU)

Suscetibilidade dos estágios ontogenéticos: padrão osmorregulatório em camarões peneídeos e palemonídeos / Susceptibility of ontogenetic stages: osmoregulatory standard in penaeid and palaemonid shrimps / Susceptibilidad de etapas ontogenéticas: estándar osmorregulatorio en camarones peneídeos y palemonídeos

A invasão da água doce por crustáceos ocorreu repetidamente ao longo dos anos, pressionando um ajuste em seus processos fisiológicos. A habilidade de sobreviver aos diferentes ambientes foi encontrada em traços osmorregulatórios, e estão relacionadas à capacidade de regular o fluido extracelular. Portanto, o objetivo deste manuscrito é explorar os processos osmorregulatórios de camarões palemonídeos e peneídeos, visualizando um padrão na capacidade osmorregulatória em ambas as famílias e, em particular, tratar de assuntos pertinentes aos efeito no ciclo ontogenético e o efeito ocasionado pelo nitrito na hemolinfa de crustáceos. Comparando palemonídeos e peneídeos, percebe-se que o sucesso da conquista do ambiente dulcícola, e a não necessidade de hiporregulação, levou à perda dessa capacidade na maioria dos palemonídeos. Dessa forma, se supõem um ancestral com capacidade hiporregulatória, uma vez que invertebrados marinhos são, parcimoniosamente, osmoconformadores. Compara-se também que o nitrito apresenta efeito nas proteínas presentes na hemolinfa dos crustáceos quando submetidos à exposição natural ou induzida deste composto, e que a capacidade osmorregulatória é, portanto, variada de acordo com seus estágios...

The invasion of freshwater by crustaceans has occurred repeatedly over the years, pressing for an adjustment in their physiological processes. The ability to survive in different environments was found in osmoregulatory traits and is related to the ability to regulate the extracellular fluid. Therefore, the purpose of this manuscript is to explore the osmoregulatory processes in palaemonid and penaeid shrimps, which display a pattern of osmoregulatory capacity in both families and, in particular, to deal with matters related to the effects on ontogenetic cycle and the effect raised by nitrite in crustacean hemolymph. By comparing palaemonid and peneid shrimps, it is possible to note the success of conquering freshwater environment, and not the need for hypo-regulation, has led to the loss of this capability in most palaemonids. Thus, it is assumed that they share an ancestor with hypo-regulatory capacity, since marine invertebrates are sparsely osmoconformers. The article also compares that nitrite has effect on proteins present in the hemolymph of crustaceans when subjected to natural or induced exposure to these compound, and osmoregulatory capacity is therefore varied according to their stages...

La invasión del agua dulce por crustáceos ocurre repetidamente a lo largo de los años, pulsando un ajuste en sus procesos fisiológicos. La capacidad de sobrevivir en diferentes ambientes se ha encontrado en rasgos osmorregulatorios y están relacionados a la capacidad de regular el fluido extracelular. Por lo tanto, el objetivo de este manuscrito es el de explotar los procesos osmorregulatorios de camarones palemonídeos y peneídeos, se muestra un estándar en la capacidad osmorregulatoria en ambas las familias y, en especial, trata de cuestiones relativas a los efectos sobre los ciclo ontogenético y el efecto causado por nitrito en la hemolinfa de crustáceos. Comparando palemonídeos y peneídeos, se da cuenta de que el éxito de la conquista del ambiente dulcícola, y sin necesidad de hipo regulación, condujo a la pérdida de esa capacidad en la mayoría de los palemonídeos. Así, se supone un ancestral con capacidad hipo regulatoria, una vez que los invertebrados marinos son, parsimoniosamente, osmoconformadores. Se compara también que el nitrito presenta efectos en las proteínas presentes en la hemolinfa de los crustáceos cuando sometidos a la exposición natural o inducida por estes compuesto, y que la capacidad osmorregulatoria es, por lo tanto, variada de acuerdo con sus etapas...

Effect of temperature on the survival and growth of freshwater prawns Macrobrachium borellii and Palaemonetes argentinus (Crustacea, Palaemonidae)

Durante un período de crianza de dos meses, se evaluó en condiciones de laboratorio el efecto de cuatro temperaturas (15°C, 20°C, 25°C y 30°C) sobre la supervivencia, número de mudas y crecimiento (incremento en muda y período de intermuda) de camarones juveniles de Macrobrachium borellii Nobili, 1896 y Palaemonetes argentinus Nobili, 1901. Ambas especies mostraron similitudes en la supervivencia y en el patrón de crecimiento, a las diferentes temperaturas. La supervivencia fue mayor a 20°C y 25°C, y disminuyendo a la menor temperatura. El número de mudas se incrementó con la temperatura, variando el período de intermuda entre 22,2 y 9,9 días en M. borellii y entre 20,8 a 9,5 días en P. argentinus, correspondiendo tales valores a 15°C y 30°C respectivamente. No se detectaron diferencias entre ambas especies en el período de intermuda. El incremento de tamaño por muda aumentó significativamente de 15°C a 25°C, reduciéndose en los camarones criados a 30°C. La pendiente de regresión entre el incremento de tamaño por muda y el largo del cefalotórax mostró variaciones significativas entre las temperaturas. El camarón M. borellii mostró una elevada tolerancia a la alta temperatura y un rápido crecimiento (casi el doble a 25°C) en comparación con P. argentinus. Estas diferencias podrían brindarle a M. borellii una ventaja competitiva para adaptarse a la dinámica de los ambientes dulceacuícolas, especialmente en áreas con impacto antropogénico.

During the two-month rearing period, the effect of four water temperatures (15°C, 20°C, 25°C and 30°C) on survival rate, number of molts, and growth rate (molt increment and intermolt period) of juvenile Macrobrachium borellii Nobili, 1896 and Palaemonetes argentinus Nobili, 1901 prawns was evaluated in laboratory conditions. The two species showed some similarities in their both survival and growth pattern at different temperatures. The survival rate was highest at 20°C and 25°C, decreasing at the lowest temperature. The number of molts increased at higher temperatures, ranging the intermolt period from 22.2 days to 9.9 days, for M. borellii, and from 20.8 to 9.5 days for P. argentinus, corresponding those values to 15°C and 30°C, respectively. No difference between species was noted in the intermolt period. The size increment by molting increased significantly from 15°C to 25°C, whereas a reduction in the growth of prawns was observed at 30°C. Significant differences among temperatures were found in the slope of regressions between the size increment by molting and the cephalothorax length. M. borellii showed a significantly higher tolerance to elevated temperature and a faster growth (about twice at 25°C) than P. argentinus. These differences could provide M. borellii a competitive advantage for a better adaptation to the dynamic of freshwater environment, especially in areas with anthropogenic impact.

Effect of temperature on the survival and growth of freshwater prawns Macrobrachium borellii and Palaemonetes argentinus (Crustacea, Palaemonidae)

Durante un período de crianza de dos meses, se evaluó en condiciones de laboratorio el efecto de cuatro temperaturas (15°C, 20°C, 25°C y 30°C) sobre la supervivencia, número de mudas y crecimiento (incremento en muda y período de intermuda) de camarones juveniles de Macrobrachium borellii Nobili, 1896 y Palaemonetes argentinus Nobili, 1901. Ambas especies mostraron similitudes en la supervivencia y en el patrón de crecimiento, a las diferentes temperaturas. La supervivencia fue mayor a 20°C y 25°C, y disminuyendo a la menor temperatura. El número de mudas se incrementó con la temperatura, variando el período de intermuda entre 22,2 y 9,9 días en M. borellii y entre 20,8 a 9,5 días en P. argentinus, correspondiendo tales valores a 15°C y 30°C respectivamente. No se detectaron diferencias entre ambas especies en el período de intermuda. El incremento de tamaño por muda aumentó significativamente de 15°C a 25°C, reduciéndose en los camarones criados a 30°C. La pendiente de regresión entre el incremento de tamaño por muda y el largo del cefalotórax mostró variaciones significativas entre las temperaturas. El camarón M. borellii mostró una elevada tolerancia a la alta temperatura y un rápido crecimiento (casi el doble a 25°C) en comparación con P. argentinus. Estas diferencias podrían brindarle a M. borellii una ventaja competitiva para adaptarse a la dinámica de los ambientes dulceacuícolas, especialmente en áreas con impacto antropogénico.

During the two-month rearing period, the effect of four water temperatures (15°C, 20°C, 25°C and 30°C) on survival rate, number of molts, and growth rate (molt increment and intermolt period) of juvenile Macrobrachium borellii Nobili, 1896 and Palaemonetes argentinus Nobili, 1901 prawns was evaluated in laboratory conditions. The two species showed some similarities in their both survival and growth pattern at different temperatures. The survival rate was highest at 20°C and 25°C, decreasing at the lowest temperature. The number of molts increased at higher temperatures, ranging the intermolt period from 22.2 days to 9.9 days, for M. borellii, and from 20.8 to 9.5 days for P. argentinus, corresponding those values to 15°C and 30°C, respectively. No difference between species was noted in the intermolt period. The size increment by molting increased significantly from 15°C to 25°C, whereas a reduction in the growth of prawns was observed at 30°C. Significant differences among temperatures were found in the slope of regressions between the size increment by molting and the cephalothorax length. M. borellii showed a significantly higher tolerance to elevated temperature and a faster growth (about twice at 25°C) than P. argentinus. These differences could provide M. borellii a competitive advantage for a better adaptation to the dynamic of freshwater environment, especially in areas with anthropogenic impact.

Dinámica espacill de crustáceos decápodos asocidos a céspedes algales en el deepartamento de córdoba, caribe Colombinno / Spatial Scale of Crustaceans Decapods Associated with Algal Assemblages in Department of Cordoba, Colombian Caribbean

Se realizó un estudio de la dinámica espacial de los crustáceos decápodos asociados a céspedes algales en los municipios de Moñitos, Puerto Escondido y Los Córdobas, Caribe colombiano. Se efectuaron cuatro muestreos trimestrales entre agosto de 2006 y julio de 2007 en cinco puntos de muestreo; dos en Moñitos, dos en Puerto Escondido y uno en Los Córdobas. Para la recolección de los especímenes se delimitó un cuadrante de 625 cm² con cinco repeticiones dispuestas al azar en cada punto de muestreo. Las macroalgas fueron separadas desde su disco de fijación al sustrato y conservadas en bolsas plásticas. Los crustáceos decápodos se conservaron en alcohol al 70%. Se identificó un total de 27 especies de crustáceos decápodos asociadas a los céspedes algales, agrupadas en 13 familias y 19 géneros, registrándose por primera vez Hippolyte pleuracanthus para el Caribe colombiano. Con base en el análisis de clasificación (UPGMA), se determinó que la estructura de las poblaciones de decápodos está relacionada con las características del sustrato rocoso y la composición algal, indicando que las diferencias en las poblaciones son consecuencia de una escala espacial. Los resultados indicaron que de las 27 especies identificadas, Epialtus bituberculatus registró el mayor porcentaje de abundancia (65,7%), seguida de Pachygrapsus transversus (6,2%), Eurypanopeus abbreviatus (3,8%), Acanthonyx petiverii (3,6%), Panopeus sp1. (3,6%) y Panopeus sp2. (3,4%). El resto de las especies aportaron una abundancia ≤2,2%.

A spatial scale study of decapods crustacean associated with algal assemblages was conducted at Moñitos, Puerto Escondido and Los Córdobas, Colombian Caribbean. During August of 2006 and July of 2007 were realized four samplings in five station; two in Moñitos, two in Puerto Escondido and one in Los Cordobas. A quarter of 625 cm2 was used to collect the species with five repetitions which were chosen at random, in each station. To separate the macroalgae from hold fast, it was used palette knife. The decapods crustaceans were separate in a plastic recipient, and those were preserved in alcohol at 70%, in bottles of plastic which were carefully named. 27 species of decapods associated with algae assemblages were reported, grouped in 13 families and 19 genera. Hippolyte pleuracanthus was registered for first time for the Colombian Caribbean. According to the classification analyses (UPGMA), it was found that the structure of the decapods crustacean were related with characteristic rocky line and algae assemblages, indicating that the differences in the population were consequences of a spatial patterns. The results indicated that of the 27 species identified, Epialtus bituberculatus recorded the highest percentage of abundance (65.7%), followed by Pachygrapsus transversus (6,2%), Eurypanopeus abbreviatus (3,8%), Acanthonyx petiverii, Panopeus sp1. (3,6%) and Panopeus sp2. (3,4%). The rest of the species provided an abundance ≤ 2.2%.

Spatial and temporal distribution of decapod larvae in the subtropical waters of the Arvoredo archipelago, SC, Brazil

The present paper aims to describe the temporal and spatial distribution of the composition and abundance of Decapoda larvae in the shallow waters around Arvoredo Marine Biological Reserve. Stomatopod occurrence is also discussed. Plankton samples were collected at five sites around the Arvoredo Island every two months for one year from May, 2002 to April, 2003. Thirty-nine morphotypes, 11 genus and 4 species (Artemesia longinaris Bate, 1888, Hexapanopeus schmitii Rathbun, 1930, Menippe nodifrons Stimpson, 1859 and Pleoticus muelleri Bate, 1888) were identified, among them only two morphotypes of Stomatopoda larvae, and the remainder Decapoda larvae. Brachyuran zoeae were the most abundant group and they were well represented by Portunidae and Xanthidae zoeae. Lucifer sp. and Caridea zoeae were the most abundant non-brachyuran taxa. Decapod larvae were observed to occur at all sampling sites, however the spatial distribution demonstrated a general tendency to greater abundance and diversity at the southern sites of the Island. Decapoda and Stomatopoda larvae occurred throughout the year, showing that reproduction is continuous, but that larval input in planktonic community was significantly higher during autumn and spring.

Este trabalho tem como objetivo a descrição da distribuição temporal e espacial da composição e abundância de larvas de decápodes nas águas rasas ao redor da Reserva Biológica Marinha do Arvoredo. A ocorrência de larvas de estomatópodes também foi discutida. Foram realizadas coletas de plâncton em cinco estações ao redor da Ilha do Arvoredo, de maio de 2002 a abril de 2003 a cada dois meses. Foram identificados 39 morfotipos, 11 gêneros e 4 espécies (Artemesia longinaris Bate, 1888, Hexapanopeus schmitii Rathbun, 1930, Menippe nodifrons Stimpson, 1859 and Pleoticus muelleri Bate, 1888), sendo apenas dois morfotipos da Ordem Stomatopoda e o restante da Ordem Decapoda. Zoés de Brachyura foi o grupo mais abundante, bem representado por larvas das famílias Portunidae e Xanthidae. Entre os não-braquiúros, Lucifer sp. e zoés de Caridea foram os taxa mais abundantes. As larvas de decápodes ocorreram ao redor de toda a Ilha, havendo uma tendência geral de maior abundância e diversidade nas estações do sul (Saco das Balas e Baía do Farol). Larvas de Decapoda e Stomatopoda ocorreram durante todo o ano, mostrando que a reprodução é contínua, com picos de contribuição de larvas na comunidade planctônica durante o outono e primavera.

Spatial and temporal distribution of decapod larvae in the subtropical waters of the Arvoredo archipelago, SC, Brazil

The present paper aims to describe the temporal and spatial distribution of the composition and abundance of Decapoda larvae in the shallow waters around Arvoredo Marine Biological Reserve. Stomatopod occurrence is also discussed. Plankton samples were collected at five sites around the Arvoredo Island every two months for one year from May, 2002 to April, 2003. Thirty-nine morphotypes, 11 genus and 4 species (Artemesia longinaris Bate, 1888, Hexapanopeus schmitii Rathbun, 1930, Menippe nodifrons Stimpson, 1859 and Pleoticus muelleri Bate, 1888) were identified, among them only two morphotypes of Stomatopoda larvae, and the remainder Decapoda larvae. Brachyuran zoeae were the most abundant group and they were well represented by Portunidae and Xanthidae zoeae. Lucifer sp. and Caridea zoeae were the most abundant non-brachyuran taxa. Decapod larvae were observed to occur at all sampling sites, however the spatial distribution demonstrated a general tendency to greater abundance and diversity at the southern sites of the Island. Decapoda and Stomatopoda larvae occurred throughout the year, showing that reproduction is continuous, but that larval input in planktonic community was significantly higher during autumn and spring.

Este trabalho tem como objetivo a descrição da distribuição temporal e espacial da composição e abundância de larvas de decápodes nas águas rasas ao redor da Reserva Biológica Marinha do Arvoredo. A ocorrência de larvas de estomatópodes também foi discutida. Foram realizadas coletas de plâncton em cinco estações ao redor da Ilha do Arvoredo, de maio de 2002 a abril de 2003 a cada dois meses. Foram identificados 39 morfotipos, 11 gêneros e 4 espécies (Artemesia longinaris Bate, 1888, Hexapanopeus schmitii Rathbun, 1930, Menippe nodifrons Stimpson, 1859 and Pleoticus muelleri Bate, 1888), sendo apenas dois morfotipos da Ordem Stomatopoda e o restante da Ordem Decapoda. Zoés de Brachyura foi o grupo mais abundante, bem representado por larvas das famílias Portunidae e Xanthidae. Entre os não-braquiúros, Lucifer sp. e zoés de Caridea foram os taxa mais abundantes. As larvas de decápodes ocorreram ao redor de toda a Ilha, havendo uma tendência geral de maior abundância e diversidade nas estações do sul (Saco das Balas e Baía do Farol). Larvas de Decapoda e Stomatopoda ocorreram durante todo o ano, mostrando que a reprodução é contínua, com picos de contribuição de larvas na comunidade planctônica durante o outono e primavera.