Anthropogenic activities are the major source of chemical pollutants including heavy metals in the coastal ecosystem which may accumulate in the aquatic organisms through the food web. Metal ...contamination in the marine fish pose serious threat to human health. This study deals with the human health risks of metal accumulation from Sarda orientalis consumption. The quantities of heavy metals were investigated in muscle, gills, and liver of striped bonito from the commercial landings of Karachi Fish Harbor, Pakistan (northern Arabian Sea). Risk for human health was evaluated by iron, zinc, manganese, copper, lead, cadmium, estimated daily intake, hazard index, and risk index. The hazard index value is <1, indicating that the estimated exposure is below reference dose for the relevant metals for monsoon, winter, and pre-monsoon. The mean hazard index for iron, zinc, manganese, copper, lead, and cadmium was 1.20 × 10
−2
for consumers. The mean risk index of lead for S. orientalis was 7.39 × 10
−9
. As a result, the metals did not exceed the World Health Organization's and the United States Environmental Protection Agency's toxicological reference.
Celotno besedilo
Dostopno za:
BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
The Alpheus lobidens is a widely distributed snapping shrimp that lives on soft and hard bottoms in warm coastal environments (Hamdy and Dorgham, 2018). The berried female of Alpheus lobidens De ...Haan, 1850 was collected from Buleji (Karachi, Pakistan) and kept in the laboratory. The larvae hatched after 2 days and existed within 7 days at room temperature 23oC - 28oC in filtered seawater with a salinity of 37 - 40 parts per thousand and a pH of 7.5 - 7.8. Artemia nauplii were used to feed the larvae. Two zoeal stages are described, illustrated and compared with those of its congener's larvae known previously.
The ovigerous female of Alpheus edwarsii (Audouim, 1826) was collected from Buleji, Karachi, Pakistan, and retained in the laboratory. The larvae hatched after 4 days and subsisted within 3 days at ...room temperature 28oC-30oC in filtered seawater with a salinity of 35-37 parts per thousand and a pH of 7.6-7.8. In order to feed the larvae, Artemia nauplii was used. Two zoeal stages are described, illustrated and compared with those of its congener's larvae known previously.
Laboratory studies were carried out on an ovigerous female of Atergatis integerrimus (Lamarck, 1801) and A. floridus (Linnaeus, 1767) collected from Buleji (Karachi, Pakistan). After 9 days larvae ...were hatched out as first zoeal stage at room temperature 29oC-30oC and water temperature 28oC-29oC in filtered seawater with a salinity of 35-37 parts per thousand and pH 7.5-7.9. The larvae were fed Artemia nauplii. A description, illustration, and comparison of its first zoeal stages with the descriptions of its congeners are provided.
Abstract
The decapod fauna on intertidal shores in northern Chile is characterized by its relatively high diversity and abundance due to the presence of continuous upwelling by the Humboldt Current, ...which results in a high productivity. The decapod fauna on intertidal rocky shores is characterized by coexisting species that inhabits in natural shelters such as cracks and eroded rocks, as well as among macroalgae. We aimed to monitor the brachyuran and anomuran (porcellanid) crabs in three intertidal sites during two periods of time in September-December 2019 in the Antofagasta region, one site without human intervention and two sites in the city of Antofagasta, for which we applied null models in ecology. We assumed that the communities are random, a viewpoint that is more robust because it reduces the risk of error type I. The results of the application of null models on the co-occurrence species revealed that species associations are mainly structured for all sites, whereas the niche-sharing null model revealed that the reported species did not share ecological niches and in consequence there is not interspecific competition. The results would probably indicate that the species of intertidal decapods have a micro-specific ecological-niche differentiation, which would explain the existence of structured pattern in species associations. The results were compared with information for other sites along the continental Chilean coast.
Present study deal with the identification of planktonic caught megalopal stages of different crab species. Zooplankton samples were collected from Clifton and Manora Channel (Karachi, Pakistan). The ...stages are described, illustrated and compared with available literature.
The larvae of Hippolytidae show such diversity that it is impossible to frame any definition which will distinguish them as a whole from other Caridea (Gurney, 1942). The present information is based ...on the morpho-taxonomic study of the zoeal stages of Lysmata vittata (Stimpson, 1860). The ovigerous females of L. vittata was collected from Buleji. Larvae were hatched at room temperature 23-25oC, in filtered seawater of a salinity of 40-37 ppt and pH 7.8. Eight zoeal stages of L. vittata are described along with their illustrations, and compared with the available descriptions of its congener's larvae given earlier.
The decapod fauna in the intertidal zone of the rocky shores of Chile is highly diverse, especially along the northern and central mainland coasts, where the influence of the cold Humboldt Current ...results in high productivity. One of the most abundant species in these ecosystems is the decapod Cyclograpsus cinereus Dana, 1851. The aim of the present study, carried out in the spring and summer seasons between 2018 and 2020, was to determine the spatial distribution patterns of the decapod C. cinereus in different sites along the rocky shores of Antofagasta bay, northern Chile, in order to establish probabilistic models that explain its distribution at each site. Individuals were counted in random quadrants in the intertidal zone. The data thus obtained were processed by application of the variance/mean ratio to determine whether the distribution of individuals was random, aggregated or uniform, associated with Poisson, negative binomial or positive binomial distributions, respectively. The data revealed aggregated (negative binomial) distribution in 15 sampling events, and uniform (positive binomial) distribution in 4 events. The sampling sites were located on rocky shores in four sectors of an urban zone, and two in a protected zone; no significant differences were found between the densities of the sites in the two zones. The results of the interpretative probabilistic models indicated aggregated distribution patterns, agreeing with previously reported interpretative probabilistic models for the distribution of decapods on the rocky shores of central and southern Chile.
During routine collection trips a few Sipunculan worms Themiste (Lagenopsis) lageniformis (Baird, 1868) were collected from the coastal waters of Pakistan. This is the first report of the species ...collected along the northern Arabian Sea (Pakistan). It is here briefly described and illustrated with a note on its distribution ecology and habitat.
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