ISSN / EISSN : 0011-216X / 1568-5403
Published by: Brill Academic Publishers (10.1163)
Total articles ≅ 6,061
Latest articles in this journal
Crustaceana, Volume 94, pp 647-650; https://doi.org/10.1163/15685403-bja10113
Crustaceana, Volume 94, pp 529-549; https://doi.org/10.1163/15685403-bja10075
We investigated the presence and ecology of Chirocephalus croaticus (Steuer, 1899) during three successive seasons (spring and autumn 2018, spring 2019) at Lake Petelinje (SW Slovenia). Although the presence (duration, abundance) of this fairy shrimp strongly differs among different seasons and both years, we showed that in a season with favourable conditions (spring 2018) its abundance increases rapidly at the end of the season as the shrimps persist in small pools until the water dries out. The species may appear again during the autumn, however, its abundance and persistence seem to be much lower and shorter than during the spring, respectively. Nevertheless, persistence and abundance may also differ strongly among the two successive spring seasons (less shrimps found during the shorter season of 2019 than in 2018). Larvae appear first, and are most abundant at the beginning of the season, and are followed by adult males (protandry) and females, which become most abundant at the end of the season. Also, larvae seem to be more abundant on exposed bottom (gravel path), while adults are much more abundant in the shelter of a submerged meadow. Ovigerous females had 9-37 cysts (fertilized eggs) in their brood pouch, and the position of differently developed eggs changed during the season; the presence of females without eggs during mid- and at the end of season indicates the production of thin-shelled summer, and thick-shelled winter cysts, respectively. In contrast with the water decrease that is in strongly negative association with the abundance of the fairy shrimps (lake size — abundance: , ), no other environmental parameters were highly associated () with species abundance. Although the local population (one of only two currently known) seems to be in good condition, appropriate conservation action should be taken to prevent the decrease of this population in the future.
Crustaceana, Volume 94, pp 597-601; https://doi.org/10.1163/15685403-bja10102
The male of an unknown species of Pennellidae is described based on a single specimen parasitic on the branchial lamellae of the limpid-wing flyingfish Cheilopogon unicolor (Valenciennes, 1847) (Pisces, Exocoetidae). The male has a 1-segmented abdomen and biramous legs 1 and 2, as well as uniramous legs 3 and 4; the rami of all legs are 2-segmented.
Crustaceana, Volume 94, pp 519-528; https://doi.org/10.1163/15685403-bja10097
The terrestrial isopods of Chile make a group on which until now only a few studies have been done, most of which based mainly on species records in isolated zones. The aim of the present study was to make an attempt at characterization of the isopods present in three coastal protected areas in the Atacama Desert and northern-central Chile, and compare the results with literature records for northern and central Chile. The collected specimens belong to the genus Benthanoides (Oniscoidea, Philosciidae), probably to the species Benthanoides pauper that was originally described for central Chile. The obtained results would not agree with literature records that described the presence of two species of the genus Tylos (Oniscoidea, Tylidae) between 26-29°S, and it would be the first isopod genus recorded north of 26°S (Paposo priority site, Antofagasta Region). More systematic and ecological studies would be necessary for understanding the geographical distribution of Chilean terrestrial isopods.
Crustaceana, Volume 94, pp 573-596; https://doi.org/10.1163/15685403-bja10110
The spot prawn fishery, targeting Pandalus platyceros, has failed to prove commercially viable on the Mexican Pacific coast. A survey was carried out off the northwestern coast of Baja California, at depths of 140-180 m. The objective was to describe the biological traits of the species to test the hypothesis that warmer water stimulates higher growth parameters. An average model was estimated that anticipated an inverted exponential growth curve, consequently the growth parameters of the Von Bertalanffy model were obtained as , carapace length (CL) and . Being a protandric hermaphrodite, the transition size was estimated at 40.8 mm CL. The results challenged the hypothesis that P. platyceros grows faster in temperate environments than in cold environments.
Crustaceana, Volume 94, pp 603-645; https://doi.org/10.1163/15685403-bja10116
In this study, we look at recent developments in our understanding of the life cycle of the red spiny lobster Panulirus argus (Latreille, 1804) and examine the evidence for connectivity between geographical regions, especially the north-northeast Brazilian continental shelf and the Wider Caribbean. The study also covers aspects of reproduction, phyllosoma density, large-scale oceanic circulation, self-recruitment, settlement patterns, ecological behaviour, and the impact of the Amazon and Orinoco river discharge on recruitment. Our findings support the hypothesis that lobster larvae are transported by ocean currents and free eddies from Brazil to the Caribbean via the Lesser Antilles, outlining a south-to-north connectivity. In addition, we look into the probable existence of hybrids between sympatric lobster species, as evidenced by differences in colour patterns and morphology.
Crustaceana, Volume 94, pp 551-571; https://doi.org/10.1163/15685403-bja10111
Female cleaner shrimps Lysmata amboinensis either underwent eyestalk ablations (EA), or were treated with two different wavelength intensities of red light (peak at 630 nm), and then their sex maturation and the effects on their egg quality parameters were compared. Vitellogenesis-inhibiting hormone (VIH), vitellogenin (VTG), VTG-receptor (VTG-R), and crustacean hyperglycemic hormone (CHH) expressions in the hepatopancreas were analysed. VTG-R expression (in situ) levels that caused the EA and red irradiation to induce the synthesis of VTG-R were assessed, and the triglycerides (TG) and glucose levels in the eggs were analysed. VIH expression was decreased in all experimental groups, but VTG and VTG-R expressions were increased. CHH expression and TG and glucose concentrations were higher in the red irradiation group, compared to the EA group. These results confirmed that the red light not only had a positive effect on the promotion of sex maturation, but it also improved the quality of the eggs, when compared to the EA method.
Crustaceana, Volume 94, pp 413-429; https://doi.org/10.1163/15685403-bja10105
The population dynamics of Stenothoe valida Dana, 1852 were studied at Cheongsapo beach of Busan, Republic of Korea, from March 2019 to March 2020. Sampling was conducted once a month at low tide during spring tides. Specimens were grouped by the cephalic length at 0.025 mm intervals, and classified into four categories: females, ovigerous females, males and juveniles. The sex ratio, defined as females : total males + females, exceeded 0.5 during most of the study period. Brood size was significantly coupled with ovigerous female size. Two to four cohorts appeared at each study period. New cohorts occurred at almost every sampling except in the samples Jun-2, and Nov-2. Life span was estimated at 1-2 months. The juvenile ratio, the ratio of ovigerous females, and the recruitment rate estimated by FiSAT were commonly high in summer and winter. The life history of S. valida was not coupled with water temperature, but had a strong seasonal pattern.
Crustaceana, Volume 94, pp 513-518; https://doi.org/10.1163/15685403-bja10099
Crustaceana, Volume 94, pp 507-511; https://doi.org/10.1163/15685403-bja10092