海拔对喀麦隆西南地区春季大型无脊椎动物和水质的影响

IF 0.9 4区 环境科学与生态学 Q4 LIMNOLOGY Annales De Limnologie-international Journal of Limnology Pub Date : 2023-01-01 DOI:10.1051/limn/2023010
Sylvie Belengfe Chinche, Christophe Piscart, Pascale Mbanga Medjo, Ernest Koji, Raoul Polycarpe Tuekam Kayo, Serge Hubert Zebaze Togouet
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引用次数: 0

摘要

研究了海拔高度对喀麦隆山海拔82 ~ 1189 m的13个泉水的生物多样性和水质的影响。无论海拔高低,泉水都具有良好的化学和生态品质。理化指标分析表明,水体温度低(19.50±2.09°C),浊度高(13.0±7.17 FTU),矿化度可接受(324.95±260.0 μS/cm),磷素含量高(0.83±0.47 mg/L)。我们观察到强烈的季节效应,在旱季温度和养分含量下降,而pH和溶解氧增加。共收集生物10265种,分属56科。以昆虫为主(47.8%),其次为蛛形纲(34.8%)。仅记录到2个刺虫类群,即Darwinulidae和Stenasellidae。随着海拔的升高,总多样性略有下降,尤其是在旱季。尽管海拔越高,温度越低,氧气含量越高,但包括EPT在内的多样性并未增加。因此,与世界其他地区的动物相比,非洲动物对气温上升不那么敏感。这一结果可能是由于非洲物种比世界其他地区的物种更能适应温暖、低氧的水域,或者是由于喀麦隆山没有对温度敏感的物种的避难所。因此,气候变化对热带非洲水生大型无脊椎动物的影响可能会减少。
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Impact of altitude on spring macroinvertebrates and water quality in South West region of Cameroon
We evaluated the impact of altitude on the biodiversity and water quality of 13 springs located from 82 to 1,189 m a.s.l. on Mount Cameroon. The springs were of good chemical and ecological quality whatever the altitude. The analysis of the physicochemical variables showed low temperature levels (19.50 ± 2.09 °C), high turbidity (13.0 ± 7.17 FTU), and an acceptable mineralization level (324.95 ± 260.0 μS/cm), with high amounts of phosphate nutrients (0.83 ± 0.47 mg/L). We observed a strong seasonal effect, with a decrease in temperature and nutrient content during the dry season whereas pH and dissolved oxygen increased. A total of 10,265 organisms, distributed into 56 families, were collected. They mostly included insects (47.8%), closely followed by Arachnida (34.8%). Only two stygobite taxa were recorded, namely Darwinulidae and Stenasellidae. Total diversity slightly decreased with altitude, especially during the dry season. Despite lower temperature and more oxygen at higher altitudes, diversity, including EPT did not increase. Therefore, African fauna are less sensitive to rising temperature than the faunas of other areas of the world. This result may be explained either by the fact that African species are better adapted to warm, low-oxygen waters than species from other parts of the world, or by the absence of refuges in Mount Cameroon that are home to temperature-sensitive species. Consequently, the impact of climate change on aquatic macroinvertebrates in tropical Africa could be reduced.
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来源期刊
CiteScore
2.20
自引率
0.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: Annales de Limnologie - International Journal of Limnology publishes papers on the ecology of freshwater systems, ranging from studies of aquatic organisms, physical and chemical works which relate to the biological environment, to ecological applications and frameworks for water management directives. Main topics: Ecology of freshwater systems ; biodiversity, taxonomy, distribution patterns in space and time, biology of animals and plants ; experimental and conceptual studies which integrate laboratory and/or field work on physiology, population dynamics, biogeochemistry and nutrient dynamics, management, mathematical modelling ; techniques for sampling and chemical analyses, ecological applications, procedures which provide frameworks for environmental legislation.
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