Callichirus major. Carolinian ghost shrimp. Callichirus major. ADW Pocket Guides on the iOS App Store! The Animal Diversity Web team is excited to announce. Biologia populacional de Callichirus major (Say, ) (Crustacea: Callianassidae) na Praia de Piedade, Brasil. Flavio de Almeida Alves-JúniorI, Marina de Sá. Category:Callichirus major Pleocyemata • Infraordo: Axiidea • Familia: Callianassidae • Genus: Callichirus • Species: Callichirus major.
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Population biology of Czllichirus major Say, Crustacea: Biologia populacional de Callichirus major Say, Crustacea: Callianassidae na Praia de Calichirus, Brasil. As coletas foram realizadas mensalmente entre dezembro de e novembro de Este estudo cria uma linha de base para futuras pesquisas com C.
The aim of this paper was to study the population ecology of Callichirus major Say, at Piedade Beach, State of Pernambuco, Brazil, through the analysis of parameters such as sex ratio, reproductive period and recruitment of juveniles into this population.
maojr Sampling was taken monthly from December to November The burrow and air temperatures, as well as the sea water salinity, were measured in situ. A Student t test was applied to mjor the value of abiotic factors between the dry and rainy seasons. The sex ratio was analyzed for each month and for the total studied period, and a Chi-square test was applied to verify if it deviated significantly from the expected proportion.
The reproductive period was determined based on the frequency of ovigerous females. The recruitment was obtained based on the frequency of non-mature individuals. The air and burrow temperatures varied significantly between the dry and rainy periods, with the highest values in the dry period. A total of individuals of C. The sex ratio was 1: In this study, the most active reproductive period of C. Recruitment of juveniles into the population occurred throughout the year, between the summer and the autumn.
According to the correlation matrix, the main abiotic factor influencing the abundance of C. This study creates a baseline for further research with C. Macrocrustaceans are important components of coastal ecosystem calliichirus, with an important role in artisanal, commercial and recreational fisheries. After spawning, the larvae usually undergo a series of molts in the open sea and then return to the coast to settle. In the case of species with planktonic larvae, it implies the transformation of its habit to a benthic form and survival until the time of settlement Done, Studies with species of Callianassids are extremely important due to their utilization as bait in coastal areas.
In Brazil, the reproductive patterns of the callianassids are poorly documented, despite of the importance of this group in coastal benthic communities. Since these studies, there have been no others from the coastal Pernambuco segment.
Thus, studies on reproduction, recruitment and sex ratio of these animals are still scarce. The aim of this paper was to analyze some aspects of the life cycle of C.
Samplings were under taken monthly from December to Novemberin the intertidal zone of Piedade beach, Pernambuco, Brazil, except in September, since no ghost shrimp was found at the beach. Three equidistant points were selected in the initial, median and final portions of the beach: The callicuirus temperature was measured with a digital thermometer, and the sea water salinity, with a refractometer.
At the laboratory, the individuals were identified and sexed according to Melo Calkichirus were classified as juvenile males, juvenile females, adult males, non-ovigerous females and ovigerous females.
The total length TLfrom the rostrum to the telson, was measured with a vernier caliper 0. The Student t test was applied to compare the abiotic factors between the dry and rainy periods. The sex ratio was analyzed by months and by the total study period, and a Chi-square test was applied to callichitus if the sex ratio maor significantly from the expected proportion 1: The distribution by size class mamor obtained using 5 mm size classesto determine the mode of each sex.
The determination of the reproductive period was based on the monthly percentages of ovigerous females Vazzoler, The monthly proportion of juveniles and adults was estimated and a Chi-square test was applied to determine if they differed significantly from the expected proportion 1: The determination of the recruitment period was based on the months where the juveniles were significantly more abundant than adults.
The burrow temperature varied from The air temperature varied from The salinity varied from The following abiotic factors varied significantly between dry and rainy periods: The burrow and air temperatures were higher in the dry period, and majpr rainfall was higher in the rainy period.
WoRMS – World Register of Marine Species – Callichirus major (Say, )
From these ghost shrimps, were sampled in the dry period, and in the rainy one. The mean TL callicbirus The frequency of ovigerous females Fig. A small peak was observed in August, transition from the rainy to the dry period. The recruitment of juveniles into the population Fig.
In April and from July to Novemberno difference in the frequency of juveniles and adults was detected.
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According to the correlation matrix, the abiotic parameter that most influenced the makor abundance and abundance of ovigerous females of C. Although not significant, it was considered regularly correlated.
However, considering only the ovigerous females, the correlation with the burrow temperature was considered strong and significant. The air temperature was also positively correlated, despite not significant, to the abundance of total individuals and ovigerous females. The rainfall was negatively correlated to the abundance of ovigerous females, being significant. Positive correlations mean that the parameters are related to an increase in the animal abundance, while negative correlations, cause the decrease in the animal abundance.
The air and burrow temperatures varied significantly between dry and rainy periods, with the highest values in the dry period September and February. However, no significant difference was observed between the periods.
In the dry period, from September to February, the salinity of the coastal surface water remains relatively uniform. The sex ratio observed in our study corroborates these studies. At Piedade beach, however, Botter-Carvalho et al.
However, they observed monthly oscillations in the sex ratio; the females were more abundant from September to February and the males, from March to September, and in this study, the females were more abundant in March, with ovigerous females in March and November, and males more abundant in August, October, February and May. According to Wennerthe deviations in the sex ratio can be a result of the differences in the life cycle, migration, mortality and growth.
These deviations may also be due to biogeographic factors, as well as intra and interspecific factors Rodrigues, The capture of individuals with a suction pump can result in an undesirable sampling selectivity. Thus, the males can build deeper burrows than females, and may also escape with greater agility.
Both phenomena also explain the higher proportion of females in the population. Nevertheless, the burrows of the juveniles are shallower and they do not have the escape capacity as the adults.
Of the Callianassidea species studied in Brazil, females were larger than males in Neocallichirus mirim Rodrigues, Pezzuto, and in C. The distribution of ghost shrimps by size class was not normal, i.
Besides, a decline in the frequency of individuals from 60 mm was observed. During the field sampling, a large number of fishermen was observed at the area, and they selected the larger ghost shrimps to use as live bait. This superexploitation of the species may not allow the population to reach their maximum sizes. In this study, the highest frequency of ovigerous females was observed in the dry period equatorial summer – September and February Fig.
According to Botter-Carvalhothe reproductive period of C. Reproductive periods usually occur in seasons with high temperatures, since the temperature favors the sexual activity and embryonic development, as described by Hill for Upogebia africana Ortmann, and Tamaki et al. Low temperatures are related to the diminution of the burrowing activity of callianassids.
According to Poseylow temperatures reduce the metabolism of ghost shrimps. In this study, the total abundance of C. According to Hill and Poseysalinity can exert a strong effect in the population of callianassids, due to its seasonal variations.
Callichirus – Wikipedia
Seasonal changes in the density of C. The seasonal variations of juveniles in a population are natural for callianassids, due to predation, environmental and biogeographic factors acting on the larval phases Rodrigues, In this study, recruitment was intensified between the summer and autumn, as a result of reproductive activity in the summer.
The embryonic development of C. Such short larval development explains the peak of recruitment right after the peak of ovigerous females. We can conclude that the females are more abundant in the population, which is a pattern for callianassids of the Brazilian coast. A well-defined reproductive period in the summer was observed, when high temperatures favor the reproductive processes and contribute to the larval development of the animal.
The recruitment of the species occurs in almost the entire study period, but it is intensified right after the reproductive peak, due to the short larval development of this species. This paper creates a baseline for further researches on C. Callianassidae em uma praia arenosa do Nordeste brasileiro. Portunidae in a Brazilian tropical estuary.
Marine Biology Callianassidae on a sandy beach, Piedade, Pernambuco, Brazil. Annual Review of Ecology and Systematics Balkema, Rotterdam, the Netherlands. Coral Reefs1: Marine Ecology9 1: Department of the Interior, Minerals Management Service. Journal of Experimental Marine Biology and Ecology3: