Neodiprion abietis es un dipriónido que tiene una distribución transcontinental en Norteamérica, y se alimenta del follaje de árboles de los géneros Abies, Pseudotsuga y Pinus. Una referencia de 1995 menciona la presencia de esta especie de insecto en México; sin embargo, carece de datos de ubicación. El objetivo del presente estudio fue determinar el taxón de un dipriónido que en 2016 se observó defoliando a Abies concolor, dentro del Área de Protección de Flora y Fauna Campo Verde, en Madera, Chihuahua, México. A través de exploraciones de campo realizadas en 2019, se recolectaron larvas directamente del follaje de sus hospedantes; además, de un adulto en el follaje y varios capullos en el suelo. Las larvas fueron confinadas en jaulas entomológicas y se alimentaron con follaje de sus hospedantes, hasta que tejieron sus capullos. La cría de los insectos se completó introduciendo los capullos a una cámara de crecimiento que se mantuvo a una temperatura de 26 ±2 ºC, con un fotoperiodo de 14:10 luz: oscuridad, hasta la obtención de adultos. La determinación de la especie se realizó mediante la observación de las características morfológicas externas y del ovipositor, basados en claves taxonómicas especializadas e ilustraciones de referencia de fuentes científicas. Los especímenes examinados correspondieron a N. abietis, lo cual confirma su presencia en el norte de México.
Introduction: Tree rings play a significant role for the reconstruction of climate variables on century scales. Objective: To reconstruct the variability of precipitation for the western part of the state of Chihuahua, based on tree rings of Pseudotsuga menziesii (Mirb.) Franco, Pinus arizonica Engelm.and Pinus strobiformis Engelm. Materials and methods: Samples were extracted with a Pressler drill, dated and growth indexes were generated based on dendrochronological techniques. A correlation analysis was run between regional chronology and observed precipitation data. A regression model was used to reconstruct precipitation. A spectral analysis determined the recurrence of droughts and the influence of El Niño Southern Oscillation (ENSO) on precipitation variability. Results and discussion: The relationship between the chronologies was statistically significant and a regional series of 359 years was developed. October-June precipitation had the highest impact on growth (r = 0.73, P < 0.01), so the variability of precipitation for that period was reconstructed for the last 359 years. Severe droughts were detected in the periods 1751-1768, 1807-1810 and 1945-1956 and a recurrence of droughts every 50 years was identified. The reconstructed precipitation variability is significantly modulated by ENSO at different time scales and frequencies. Conclusion: Paleoclimatic series help us to spread the knowledge of climate in specific geographic regions and to analyze the recurrence of extreme events (droughts).
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