Introduction COVID-19 emerged as a global pandemic in 2020 and has affected millions of lives. Surgical training has also been significantly affected by this pandemic, but the exact effect remains unknown. We sought to perform a national survey of general surgery residents in the United States to assess the effect of COVID-19 on surgical resident training, education, and burnout. Methods An anonymous online survey was created and distributed to general surgery residents across the United States. The survey aimed to assess changes to surgical residents’ clinical schedules, operative volume, and educational curricula as a result of the COVID-19 pandemic. Additionally, we sought to assess the impact of COVID-19 on resident burnout. Results One thousand one hundred and two general surgery residents completed the survey. Residents reported a significant decline in the number of cases performed during the pandemic. Educational curricula were largely shifted toward online didactics. The majority of residents reported spending more time on educational didactics than before the pandemic. The majority of residents feared contracting COVID-19 or transmitting it to their family during the pandemic. Conclusions COVID-19 has had significant impact on surgical training and education. One positive consequence of the pandemic is increased educational didactics. Online didactics should continue to be a part of surgical education in the post-COVID-19 era. Steps need to be taken to ensure that graduating surgical residents are adequately prepared for fellowship and independent practice despite the significantly decreased case volumes during this pandemic. Surgery training programs should focus on providing nontechnical clinical training and professional development during this time.

In laboratory experiments, quagga mussels (Dreissena bugensis) survived as well as zebra mussels (Dreissena polymorpha) and equaled or exceeded their growth rate (–3 to 242% change in wet mass) when reared at 6 or 23°C and fed natural seston or Chlamydomonas at food levels ranging from 0.05–7.4 µg·L–1 chlorophyll a (chl a). Superior growth of quagga mussels was most pronounced at low food levels. We found no significant differences in per capita clearance rates (CR), functional responses, or feeding behavior between zebra and quagga mussels fed Chlamydomonas, Nannochloris, or mixed suspensions of Nannochloris and clay. Per capita CR ranged from 0.018 to 0.402 L·mussel–1·h–1 for zebra mussels and from 0.010 to 0.407 L·mussel–1·h–1 for quagga mussels. Because quagga mussels had more biomass per unit shell length, we found lower biomass-specific CR for quagga mussels. When fed natural seston, zebra and quagga mussels could selectively reject inorganic material and at the lowest seston level the assimilation efficiency of quagga mussels (81%) was significantly higher than that of zebra mussels (63%). Our experiments suggest that quagga mussels can survive, grow, and feed as well or better than zebra mussels in epilimnetic waters with either low or high productivity.

Abstract. Climate variability, particularly the frequency of extreme events, is likely to increase in the coming decades, with poorly understood consequences for terrestrial ecosystems. Hydroclimatic variations of the Medieval Climate Anomaly (MCA) provide a setting for studying ecological responses to recent climate variability at magnitudes and timescales comparable to expectations of coming centuries. We examined forest response to the MCA in the humid western Great Lakes region of North America, using proxy records of vegetation, fire, and hydroclimate. Multi-decadal moisture variability during the MCA was associated with a widespread, episodic decline in Fagus grandifolia (beech) populations. Spatial patterns of drought and forest changes were coherent, with beech declining only in areas where proxyclimate records indicate that severe MCA droughts occurred. The occurrence of widespread, drought-induced ecological changes in the Great Lakes region indicates that ecosystems in humid regions are vulnerable to rapid changes in drought magnitude and frequency.

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