Distribution of the species of Lucifer Thompson, 1829 in the subtropical South Atlantic between parallels 20º and 30ºs

Abstract

The distribution of the species of Lucifer Thompson, 1829 (Decapoda: Luciferidae) in the South Atlantic Subtropical Gyre was assessed by the Brazil Transatlantic Commission in November and December 2009. The samples were collected at 83 stations on two profiles between Brazil and Africa (20 º and 30 ºS). Oblique hauls were performed with a WP-2 net up to 150 meters deep. A distinct sexual relationship was noted between the two species found and L. faxoni presented a significantly higher number of females relative to males 1:0.5 (X2 = 21.77, p = 0.0001). The L. typus sex ratio had significantly more males than females 1.86:1 (X2=50.84, p = 0.0001). The distribution of L. typus occurred in both the western and the eastern portions of the Mid-Oceanic Ridge. This distribution was significantly related to salinity (R2 = 0:13; F = 3.79, p = 0.009), which was higher in the western portion of the study area. In addition, the recordings of the two species were extended to the Atlantic Subtropical Gyre. Overall, Luciferidae shrimp were more common and abundant at the stations west of the Mid-Oceanic Ridge and L. typus was the most frequent and abundant species.

Population Structure and Seasonal Variability of two Luciferid Species (Decapoda: Sergestoidea) in the Western Gulf of Mexico

“…The sex ratio favored the females in the B. faxoni population in all the sampled seasons as observed in other localities of the northern and southern Gulf of Mexico [19,38], southern Brazil [36], and the South Atlantic Gyre [39]. By contrast, the L. typus population showed variable sex proportions that were only skewed towards females in July when the species exhibited its highest abundance values.…”

“…Differential migratory behavior between sexes could be the cause of sex disparity in a sample. Concerning luciferids, Marafon-Almeida et al [39] supported differential vertical migration between the sexes, but Álvarez [48] found no differences in the migration patterns of males and females. The causes of sex disparity observed in this study are not fully understood.…”

Spatio-temporal variation of planktonic decapods along the leeward coast of the Fernando de Noronha archipelago, Brazil

“…Studies on the larval ecology of Decapoda are essential to the understanding of the marine ecosystems in which they are inserted (Schwamborn et al, 1999;Anger, 2001;Brandão et al, 2012Brandão et al, , 2013. Even so, little effort has been made to assess the distribution and composition of decapod larvae in oceanic island environments in Brazil (Koettker et al, 2010;Brandão et al, 2012Brandão et al, , 2013Marafon-Almeida et al, 2016), specifically for the Fernando de Noronha archipelago (Lira et al, 2014(Lira et al, , 2017(Lira et al, , 2018.…”

Factors affecting the seasonal variability of planktonic shrimps (Dendrobranchiata) along an estuary–ocean gradient on the Amazon continental shelf

“…plays an important role in the food web and produces high biomass in continental shelf environments (Longhurst, 1985). The holoplanktonic shrimp Lucifer typus was confirmed as an oceanic tropical water shrimp (Bowman & McCain, 1967;Xu, 2010;Melo et al, 2014;Marafon-Almeida et al, 2016) while B. faxoni proved to be typically coastal, with the highest densities among all the shrimp taxa in this study (Bowman & McCain, 1967;Longhurst, 1985;Arshad et al, 2011), thus corroborating Melo et al (2014), who reported its high-density pattern on the ACS.…”