| 1. |
- Salgado-Neto, G., et al.
(författare)
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Horismenus camobiensis (Hym. : Eulophidae), a new hyperparasitoid of Cotesia invirae (Hym.: Braconidae) in Opsiphanes invirae (Lep.: Nymphalidae) pupae
- 2022
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Ingår i: Brazilian journal of biology = Revista brasleira de biologia. - : FapUNIFESP (SciELO). - 1678-4375. ; 84, s. 249008-249008
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Tidskriftsartikel (refereegranskat)abstract
- Horismenus camobiensis sp. nov. (Hymenoptera: Eulophidae), is described based on morphological, molecular and ecological data; this new species of chalcid wasp acts as hyperparasitoid of Opsiphanis invirae (Hübner, 1818) (Lepidoptera: Nymphalidae) in its parasitoid Cotesia invirae Salgado-Neto and Whitfield, 2019 (Hymenoptera: Braconidae). Diagnoses with morphological and molecular characters and illustrations are provided.
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| 2. |
- Marotta, H., et al.
(författare)
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Catastrophic shifts in the aquatic primary production revealed by a small low-flow section of tropical downstream after dredging
- 2015
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Ingår i: Brazilian Journal of Biology. - : INT INST ECOLOGY. - 1519-6984 .- 1678-4375. ; 75:4, s. 804-811
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Tidskriftsartikel (refereegranskat)abstract
- Dredging is a catastrophic disturbance that directly affects key biological processes in aquatic ecosystems, especially in those small and shallow. In the tropics, metabolic responses could still be enhanced by the high temperatures and solar incidence. Here, we assessed changes in the aquatic primary production along a small section of low-flow tropical downstream (Imboassica Stream, Brazil) after dredging. Our results suggested that these ecosystems may show catastrophic shifts between net heterotrophy and autotrophy in waters based on three short-term stages following the dredging: (I) a strongly heterotrophic net primary production -NPP- coupled to an intense respiration -R- likely supported by high resuspended organic sediments and nutrients from the bottom; (II) a strongly autotrophic NPP coupled to an intense gross primary production -GPP- favored by the high nutrient levels and low solar light attenuation from suspended solids or aquatic macrophytes; and (III) a NPP near to the equilibrium coupled to low GPP and R rates following, respectively, the shading by aquatic macrophytes and high particulate sedimentation. In conclusion, changes in aquatic primary production could be an important threshold for controlling drastic shifts in the organic matter cycling and the subsequent silting up of small tropical streams after dredging events.
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| 3. |
- Masuda, L. S. M., et al.
(författare)
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Benthic microalgae community response to flooding in a tropical salt flat
- 2016
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Ingår i: Brazilian Journal of Biology. - : INT INST ECOLOGY. - 1519-6984 .- 1678-4375. ; 76:3, s. 577-582
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Tidskriftsartikel (refereegranskat)abstract
- This research evaluated the effect of flooding on the microphytobenthos community structure in a microbial mat from a tropical salt flat. Field samples were collected during four consecutive days: on the first three days the salt flat was dry, on the fourth day it was flooded by rain. In order to evaluate the community maintained in flood conditions, samples from this area were collected and kept in the laboratory for 10 days with sea water. The results of total abundance of microphytobenthos varied from 4.2 x 10(8) to 2.9 x 10(9) organisms L-1, total density increased one order of magnitude under the effect of water for both situations of precipitation in the salt flat and in experimental conditions, an increase due to the high abundance of Microcoleus spp. Shannon index (H) was higher during the desiccation period. Our data suggest that changes in the abundance of organisms were due to the effect of water. The dominance of the most abundant taxa remained the same under conditions of desiccation and influence of water, and there is probably a consortium of microorganisms in the microbial mat that helps to maintain these dominances.
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