A survey of natural ecotopes of Triatoma infestans dark morph and other triatomine sylvatic species was performed in an uninhabited area of the Bolivian Chaco. Among the 321 triatomines collected by light trapping, only 4 T. infestans dark morph specimens were identified. Predominant flying species were T. guasayana and T. sordida group 2 (51.7% and 37.1% of capture, respectively). The same species prevailed in terrestrial and epiphytic bromeliads where scarce T. infestans dark morph nymphal instars were also detected. In parrot nests T. delpontei prevailed broadly over other species (90.2% of the capture) and only 4 T. infestans dark morph adults were collected. In contrast, T. infestans dark morph was the predominant species captured in hollow trees (46.0% of the total collected). The abundance of immature forms (88.2% of the collection) shows that hollow trees constitute a favourable ecotope for this species. Of the 421 trees investigated, 33.7% were positive for triatomines. T. infestans dark morph, found inside 15.0% of them, also had higher apparent density than other species (average number of T. infestans in positive trees, 2.0 +/- 1.6 vs 1.3 +/- 0.6 for other species). Light trapping seems to be an efficient method to sample the T. sordida-T. guasayana complex in that it shows a similar distribution to that observed in natural ecotopes; however, this method is ineffective for the assessment of the local abundance of T. infestans dark morph.
Abstract. Elevated organic matter (OM) concentrations are found in hadal
surface sediments relative to the surrounding abyssal seabed. However, the
origin of this biological material remains elusive. Here, we report on the
composition and distribution of cellular membrane intact polar lipids (IPLs)
extracted from surface sediments around the deepest points of the Atacama
Trench and adjacent bathyal margin to assess and constrain the sources of
labile OM in the hadal seabed. Multiscale bootstrap resampling of IPLs'
structural diversity and abundance indicates distinct lipid signatures in
the sediments of the Atacama Trench that are more closely related to those
found in bathyal sediments than to those previously reported for the upper
ocean water column in the region. Whereas the overall number of unique IPL
structures in hadal sediments contributes a small fraction of the total IPL
pool, we also report a high contribution of phospholipids with mono- and
di-unsaturated fatty acids that are not associated with photoautotrophic
sources and that resemble traits of physiological adaptation to high
pressure and low temperature. Our results indicate that IPLs in hadal
sediments of the Atacama Trench predominantly derive from in situ microbial
production and biomass, whereas the export of the most labile lipid
component of the OM pool from the euphotic zone and the overlying oxygen
minimum zone is neglectable. While other OM sources such as the downslope
and/or lateral transport of labile OM cannot be ruled out and remain to be
studied, they are likely less important in view of the lability of
ester-bond IPLs. Our results contribute to the understanding of the
mechanisms that control the delivery of labile OM to this extreme deep-sea
ecosystem. Furthermore, they provide insights into some potential
physiological adaptation of the in situ microbial community to high pressure and
low temperature through lipid remodeling.
The presence of a Palinuridae phyllosoma larvae near Salado Bay (27º'S) north-central coast of Chile, is reported. The identification is discussed and the possibility of this larvae being Projasus bahamondei, which is the only species from the family that is described for the area, is discarded. The shape, size and position of the cephalic, pereionic, abdominal and telson appendices concords with descriptions of advanced stage Jasus frontalis larvae. Moreover, the specimen described here has five pairs of biramous pereiopods with setose exopods. In accordance with these observations and published data, it is proposed that this phyllosoma corresponds to a stage XII or XIII of J. frontalis larva.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.