10 documents found, page 1 of 1
Seasonal synchrony between Saissetia oleae and coccinellid species in Portugues...
Santos, SAP; Pereira, JA; Raimundo, A; Torres, LM; Nogueira, AJAThe black scale, Saissetia oleae (Olivier) (Hemiptera Coceidae), is one of the main olive pests and coecinellids are among the principal predators that feed on scales. The relationships between the temporal abundance or live common coccinellid species [Chilocorus bipustulatus L. Scymnus subvillosus (Goeze), Scymnus mediterraneus lablokoff-Khnzorian, Scymnus interruptus (Goeze), Rhyzabius chrysomeloides (Herbst)...
Response of coccinellid community to the dimethoate application in olive groves...
Santos, SAP; Pereira, JA; Raimundo, A; Torres, LM; Nogueira, AJAIn this work we assessed the effects of the application of dimethoate on the coccinellid community. The field work was carried out on a weekly basis, in two different olive groves, from April to November of 2002 and 2003 and captured coccinellids were identified to species level. Principal response curves (PRC) method was used to analyse the effect of the dimethoate application on the abundance of coccinellid s...
Direct and Indirect Effects of the Fungicide Carbendazim in Tropical Freshwater...
Daam, MA; Satapornvanit, K; Van den Brink, PJ; Nogueira, AJADirect and indirect effects of the fungicide carbendazim on ecosystem structure and functioning were studied a parts per thousand currency sign8 weeks after application (nominal concentrations: 0, 3.3, 33, 100, and 1000 mu g/L) to outdoor microcosms in Thailand. Direct effects on macroinvertebrates are discussed in detail in a separate article. The present article presents the effects on other end points and di...
Cholinesterase and glutathione-s-transferase activities in freshwater invertebr...
Domingues, I; Agra, AR; Monaghan, K; Soares, AMVM; Nogueira, AJAStudies investigating the use of biomarkers in pesticide risk assessment have greatly increased in recent years; however, issues concerning the ecological meaning of enzymatic responses have proved controversial. Ideally a good biomarker response should be modulated by the environmental contaminants alone and demonstrate a predictable behavior towards certain types of toxins. As these premises are rarely observ...
Identification of predator-prey relationships between coccinellids and Saisseti...
Santos, SAP; Pereira, JA; Rodrigues, MD; Torres, LM; Pereira, AMN; Nogueira, AJAA polyclonal antiserum (AS) was developed and characterized for the detection of immature stages of the black-scale, Saissetia oleae, in whole body homogenized field-collected coccinellid species, using an indirect enzyme-linked immunosorbent assay (ELISA). The indirect ELISA showed to be sensitive to the S. oleae AS, detecting a protein content between 0.118 and 0.0374 mu g mL(-1). The specificity of the ELISA...
Ecological effects of the herbicide linuron in tropical freshwater microcosms
Daam, MA; Rodrigues, AMF; Van den Brink, PJ; Nogueira, AJAEffects of a single application of the photosynthesis-inhibiting herbicide linuron (0, 15, 50, 150, and 500 mu g/L) on the ecology of outdoor plankton-dominated microcosms were studied in Thailand. As a result of the decreased photosynthesis, DO and pH decreased while EC, alkalinity and nutrient concentrations increased. Chlorophytes belonging to the genera Scenedesmus, Coelastrum and Pediastrum were the most s...
Comparison of fate and ecological effects of the herbicide linuron in freshwate...
Daam, MA; Van den Brink, PJ; Nogueira, AJAThis paper compares the fate and effects of linuron in an outdoor plankton-dominated microcosm study carried out in Thailand with those reported in temperate model ecosystem studies evaluating linuron and other photosynthesis-inhibiting herbicides. Lower linuron concentrations disappeared slightly faster from the water compartment compared to temperate conditions, which appears to be related with the experiment...
Cholinesterase and glutathione S-transferase activities of three mollusc specie...
Tim-Tim, ALS; Morgado, F; Moreira, S; Rangel, R; Nogueira, AJA; Soares, AMVM; Guilhermino, LIn November 2002, the tanker 'Prestige' released about 19,000 tonnes of a heavy fuel oil (no. 6) before sinking with about 58,000 tonnes of its cargo, 135 miles from Cabo Finisterra (Spain). A considerable part of the released fuel oil reached the Galician coast, causing a heavy black tide and an ecological disaster. Although the black tide did not reach the NW coast of Portugal, it is possible that some of the...
Fate and effects of the insecticide chlorpyrifos in outdoor plankton-dominated ...
Daam, MA; Crum, SJH; Van den Brink, PJ; Nogueira, AJAThe fate and effects of the insecticide chlorpyrifos were studied in plankton-dominated, freshwater microcosms in Thailand. Disappearance rates of chlorpyrifos from the water column in the present study were similar to those in temperate regions. Insecticide accumulation in the sediment was relatively small, with the major part in the top layer (depth, 1.5 cm). Application of chlorpyrifos led to significant cha...
Growth and extremely high production of the non-indigenous invasive species Cor...
Sousa, R; Nogueira, AJA; Gaspar, MB; Antunes, C; Guilhermino, LThe Asian clam Corbicula fluminea (Willer, 1774) is a major component of the River Minho estuary, almost completely dominating the benthic biomass. As part of a major study into the ecology of C fluminea, benthic samples were collected monthly from January 2005 to August 2006. These data were then used to estimate the abundance, biomass, growth, and growth and elimination production of this non-indigenous invas...