The rhythm of stereotypic behaviors in captive giant panda (Ailuropoda melanoleuca)北大核心CSCD

Stereotypy can be defined as a repetitive behavioral pattern with no apparent function or target in captivity. It is considered an abnormal behavior in contrast to the behavior in wild habitats and is often used as an important index to evaluate the captive environment, which has a significant scientific value. Many previous studies have focused on the impact of environment on stereotypical behavior; however, the rhythm of stereotypy remains unclear. To determine the mechanism of stereotypy, eight giant pandas (Ailuropoda melanoleuca) were investigated 24 h a day from Jan 2018 to Dec 2019, with focal sampling and continuous recording. No stereotypy in the juveniles was noted, while the adult giant pandas displayed different stereotypies. Mean stereotypy durations were 0.72% of the total activity in circadian rhythm, with a peak of mean durations in all seasons occurring at 7:00 am–9:00 am, while, in spring, there was a peak of mean duration at 1:00 am–3:00 am. Although there was no significant difference, mean stereotypy durations and frequencies in the night were longer than those in the daytime. Mean stereotypy frequencies in spring reached the highest level, whereas mean stereotypy durations in winter were maximal. The adult giant pandas in the daytime showed maximal mean stereotypy durations in winter and minimal mean stereotypy durations in busy seasons (summer and autumn), whereas mean stereotypy durations at night were maximal in busy seasons. Despite no significant differences among these seasons, our results suggest that the stereotypy of giant pandas may have diurnal rhythms and seasonal differences. In light of the similar captive environment between adult and juvenile giant pandas, the appearance of stereotypy may be correlated with age, which may be the effects of the environment or a strategy of adaptation. © 2022 Science Press. All rights reserved.     

李家河水库春季分层期nirS型反硝化菌群特征分析

为探究水源水库春季分层期（3～5月）nirS型反硝化细菌群落结构组成及其与水质的关系,以李家河水库为例,采用原位监测耦合Illumina高通量测序技术,分析了水体水质及反硝化细菌群落相对丰度及结构特征.结果表明:（1）通过高通量测序,鉴定为4门13属,优势菌门为变形菌门（Proteobacteria）,相对丰度在52.5%～70.6%,时间尺度总体呈降低趋势（P<0.05）,空间尺度上表层和中层高于底层（P<0.05）,表层与中层无差异（P>0.05）;识别出具有反硝化功能细菌8属,其中优势菌属（相对丰度>1%）为脱氯单胞菌属（Dechloromonas）和假单胞菌属（Pseudomonas）,脱氯单胞菌属相对丰度在时间上呈先降低后升高的趋势,假单胞菌属在时间上呈先升高后降低的趋势,此2属在空间上无差异（P>0.05）;细菌多样性及丰富度变化基本一致,时间上呈先升高后减低的趋势,空间上随深度逐渐升高;（2）本研究期间水库水体ρ（总氮）为2.35～2.91 mg·L^-1,氮素污染较为严重,3月和4月垂向水体总氮基本一致且呈降低趋势,5月...     

分层型水库藻类季相演替的细菌种群驱动机制

浮游藻类和水体中的细菌是水生食物网的组成部分,在淡水生态系统的结构和功能中发挥着关键作用.然而,对于水库当中藻类和细菌群落如何互作及其对变化的环境条件的响应研究却较少.本文以李家河水库为研究对象,采用16S rDNA高通量测序技术和共生网络分析方法,分析了藻类种群时空演替与细菌群落的生态互作关系.结果表明,在藻类群落结...     

中国环境空气苯系物类挥发性有机物监测能力现状分析

为了解和评价中国环境空气挥发性有机物(VOCs)的监测能力和技术水平,以量化的手段评估环境空气VOCs监测数据质量,促进实验室质量管理水平提升,笔者以环境空气VOCs中的苯系物为代表,组织31个省、自治区、直辖市216家各级各类生态环境检验检测机构开展了实验室比对,利用稳健统计技术分析评价实验结果.结果表明:环境空气苯...