Bees exposed to climate change are more sensitive to pesticides.

Bee populations are exposed to multiple stressors, including land-use change, biological invasions, climate change, and pesticide exposure, that may interact synergistically. We analyze the combined effects of climate warming and sublethal insecticide exposure in the solitary bee Osmia cornuta. Previous Osmia studies show that warm wintering temperatures cause body weight loss, lipid consumption, and fat body depletion. Because the fat body plays a key role in xenobiotic detoxification, we expected that bees exposed to climate warming scenarios would be more sensitive to pesticides. We exposed O. cornuta females to three wintering treatments: current scenario (2007-2012 temperatures), near-future (2021-2050 projected temperatures), and distant-future (2051-2080). Upon emergence in spring, bees were orally exposed to three sublethal doses of an insecticide (Closer, a.i. sulfoxaflor; 0, 4.55 and 11.64 ng a.i./bee). We measured the combined effects of wintering and insecticide exposure on phototactic response, syrup consumption, and longevity. Wintering treatment by itself did not affect winter mortality, but body weight loss increased with increasing wintering temperatures. Similarly, wintering treatment by itself hardly influenced phototactic response or syrup consumption. However, bees wintered at the warmest temperatures had shorter longevity, a strong fecundity predictor in Osmia. Insecticide exposure, especially at the high dose, impaired the ability of bees to respond to light, and resulted in reduced syrup consumption and longevity. The combination of the warmest winter and the high insecticide dose resulted in a 70% longevity decrease. Smaller bees, resulting from smaller pollen-nectar provisions, had shorter longevity suggesting nutritional stress may further compromise fecundity in O. cornuta. Our results show a synergistic interaction between two major drivers of bee declines, and indicate that bees will become more sensitive to pesticides under the current global warming scenario. Our findings have important implications for pesticide regulation and underscore the need to consider multiple stressors to understand bee declines.

[Severe lactic acidosis in a pregnant woman with partial HELLP syndrome and COVID-19]. / Acidosis láctica grave en una mujer embarazada con síndrome HELLP parcial y COVID-19.

The present report describes the case of a 23-year old pregnant woman who was in the 36.5th week of gestation of her second pregnancy. She was attended at the emergency room because of dry cough and progressive dyspnea, in association with headache and myalgia. The nasopharyngeal swab for SARS-CoV-2 polymerase chain reaction (PCR) was positive. Oxygen saturation and chest x-ray were normal. Laboratory tests showed elevated values of bilirubin, aminotransferases, alkaline phosphatase and lactic dehydrogenase, and mild thrombocytopenia. Shortly after being admitted she began with labor. Faced with the lack of progression, the termination of the pregnancy by cesarean section was decided. Arterial blood gases showed severe lactic acidosis. She never presented evidence of clinical signs of tissue hypoperfusion or sepsis that could explain it. The patient completed her postoperative period in the intensive care unit, undergoing supportive treatment. All laboratory parameters were normalized after 72 hours, evolving favorably from the clinical point of view. It was interpreted that she had a partial HELLP syndrome. Lactic acidosis is not a component of this syndrome. Nor can it be ascribed to a mild disease by SARS-Cov-2. It probably responded to a summation of causes, including hyperproduction of lactic acid during labor, as well as its reduced clearance because of liver dysfunction related to HELLP syndrome.

Se presenta el caso de una mujer embarazada secundigesta, cursando la semana 36.5 de gestación, que concurrió a guardia general por tos seca y disnea progresiva de 3 días de evolución, asociadas a cefalea y mialgias. Se realizó hisopado nasofaríngeo para reacción en cadena de la polimerasa (PCR) para SARS-CoV-2, resultando positivo. La saturación de oxígeno era normal, al igual que la radiografía de tórax. En el laboratorio presentó elevación de bilirrubina, transaminasas, fosfatasa alcalina y LDH, además de plaquetopenia leve. Poco después de su ingreso, comenzó con trabajo de parto. Frente a la falta de progresión del mismo se decidió la finalización del embarazo por cesárea. La gasometría arterial reveló la presencia de acidosis láctica grave. Nunca hubo evidencia clínica de hipoperfusión tisular o sepsis que pudieran explicarla. Cursó su postoperatorio en la unidad de terapia intensiva, realizándose tratamiento de sostén. Todos los parámetros de laboratorio se normalizaron al cabo de 72 horas, evolucionando favorablemente desde el punto de vista clínico. Se interpretó que cursó un síndrome HELLP parcial. La acidosis láctica no es un componente descripto en este síndrome. Tampoco puede adscribirse a la enfermedad leve por SARS-CoV-2. Podría deberse a una sumatoria de causas, incluidas la hiperproducción de ácido láctico en el marco del trabajo de parto, como la disminución de su aclaramiento por la disfunción hepática asociada al síndrome HELLP.

Acidosis láctica grave en una mujer embarazada con síndrome HELLP parcial y COVID-19 / Severe lactic acidosis in a pregnant woman with partial HELLP syndrome and COVID-19

Resumen Se presenta el caso de una mujer embarazada secundigesta, cursando la semana 36.5 de gestación, que concurrió a guardia general por tos seca y disnea progresiva de 3 días de evolución, asociadas a cefalea y mialgias. Se realizó hisopado nasofaríngeo para reacción en cadena de la polimerasa (PCR) para SARS-CoV-2, resultando positivo. La saturación de oxígeno era normal, al igual que la radiografía de tórax. En el laboratorio presentó elevación de bilirrubina, transaminasas, fosfatasa alcalina y LDH, además de plaqueto penia leve. Poco después de su ingreso, comenzó con trabajo de parto. Frente a la falta de progresión del mis mo se decidió la finalización del embarazo por cesárea. La gasometría arterial reveló la presencia de acidosis láctica grave. Nunca hubo evidencia clínica de hipoperfusión tisular o sepsis que pudieran explicarla. Cursó su postoperatorio en la unidad de terapia intensiva, realizándose tratamiento de sostén. Todos los parámetros de laboratorio se normalizaron al cabo de 72 horas, evolucionando favorablemente desde el punto de vista clínico. Se interpretó que cursó un síndrome HELLP parcial. La acidosis láctica no es un componente descripto en este síndrome. Tampoco puede adscribirse a la enfermedad leve por SARS-CoV-2. Podría deberse a una sumatoria de causas, incluidas la hiperproducción de ácido láctico en el marco del trabajo de parto, como la disminución de su aclaramiento por la disfunción hepática asociada al síndrome HELLP.

Abstract The present report describes the case of a 23-year old pregnant woman who was in the 36.5th week of gestation of her second pregnancy. She was attended at the emergency room because of dry cough and progressive dyspnea, in association with headache and myalgia. The nasopharyngeal swab for SARS-CoV-2 polymerase chain reaction (PCR) was positive. Oxygen saturation and chest x-ray were normal. Laboratory tests showed elevated values of bilirubin, aminotransferases, alkaline phosphatase and lactic dehydrogenase, and mild thrombocytopenia. Shortly after being admitted she began with labor. Faced with the lack of progression, the termination of the pregnancy by cesarean section was decided. Arterial blood gases showed severe lactic acidosis. She never presented evidence of clinical signs of tissue hypoperfusion or sepsis that could explain it. The patient completed her postoperative period in the intensive care unit, undergoing supportive treatment. All laboratory parameters were normalized after 72 hours, evolving favorably from the clinical point of view. It was interpreted that she had a partial HELLP syndrome. Lactic acidosis is not a component of this syndrome. Nor can it be ascribed to a mild disease by SARS-Cov-2. It probably responded to a summation of causes, including hyperproduction of lactic acid during labor, as well as its reduced clearance because of liver dysfunction related to HELLP syndrome.

Local and downstream cumulative effects of traditional meadow management on stream-water quality and multiple riparian taxa.

Water quality and riparian communities are among the most affected stream components by agriculture. However, little is known about the effects of riparian management for both aquatic and terrestrial taxa at different spatial scales. Here, we surveyed aquatic (diatoms) and terrestrial taxa (bryophytes, vascular plants, litter-dwelling snails, and ground and volant arthropods), to compare the abundance and richness of riparian taxa and chemical quality between reference and exposed sites in two stream reaches each of c. 3.5 km in northwestern Spain. Impacts in exposed sites were mainly due to traditional farming practices (TFPs), which included traditional meadow management, weirs built for now-unused water mills and sporadic timber harvesting. Therefore, we measured ten covariates and predictors related to the intensification of TFPs at local and within-stream scales and explored associations with riparian and water-quality measures to study the potential effects of TFPs in more detail. Reference and exposed sites did not differ significantly in water properties (diatom-biotic indices, conductivity, total organic carbon and nitrates), but exposed sites had less concentrations of soil metals Cd, Cu, Ni and Zn and less cover and richness of riparian trees, as inferred by the index QBR. Exposed sites had more volant insect decomposers and reference sites a greater abundance or richness of snails, ground predators and decomposers. Bryophyte richness was greater in reference sites. Our inferences may inform the joint cumulative downstream effects of weirs, meadow uses and riparian alterations but were generally consistent with most riparian taxa benefiting from having larger forested areas. Given the contrasting responses among taxa, we argue that land snails, terrestrial flies, and centipedes may be valuable additions to current riparian assessments mostly based on plants, beetles and spiders as indicator taxa. Our study also suggests caution when inferring farming impacts on streams from the surface area of pastoral land.