Riparian forest loss and various land use impacts on macroinvertebrate communities in Nigerian streams remain poorly understudied. To fill this knowledge gap, a study was conducted on five streams in the southwest ecoregion of Nigeria between December 2019 and October 2021. A total of 2,077 macroinvertebrates were sampled, comprising 16 orders, 40 families, and 80 species. Aquatic insects were the most abundant, constituting 85 % of species and 73.13 % of individuals. Other specimens included Mollusca, Crustacea, Arachnida, and Annelida. Notably, Olumirin stream exhibited the highest macroinvertebrate abundance, including the stress-sensitive Ephemeroptera-Plecoptera-Trichoptera (EPT) members. The site also had the highest degree of naturalness, widest channel and dissolved oxygen (DO), but lowest electrical conductivity (EC) and total dissolved solids (TDS) compared to the other streams (Abirunmu, Awoosun, Mogimogi, and Aboto), that harbored facultative and stress-tolerant species, indicating varying degrees of disturbances. The bivariate regression analysis confirms that riparian deforestation and land use impact macroinvertebrate distribution in streams as there was an inverse relationship between EPT abundance and forest cover. Also, DO positively correlates with EPT taxa richness but inversely correlates with Coleoptera richness and Hemiptera abundance. As a result, Olumirin stream is proposed as a benchmark for evaluating freshwater ecological integrity in the region. Given the escalating anthropogenic activities in the tropics, urgent collaborative efforts are required to safeguard freshwater biodiversity, protect the riparian corridor of Olumirin stream, and restore impaired streams in the region.

中文翻译：

---

比较调查提供了关于河岸森林砍伐和不同土地利用如何影响尼日利亚溪流中淡水大型无脊椎动物分布的进一步见解

河岸森林丧失和各种土地利用对尼日利亚溪流大型无脊椎动物群落的影响仍未得到充分研究。为了填补这一知识空白，2019年12月至2021年10月期间，对尼日利亚西南生态区的5条溪流进行了一项研究。共采集了2,077种大型无脊椎动物样本，包括16目、40科、80种。水生昆虫数量最多，占物种的85%，占个体的73.13%。其他标本包括软体动物、甲壳动物、蛛形纲和环节动物。值得注意的是，奥卢米林流表现出最高的大型无脊椎动物丰度，包括应激敏感的蜉蝣目-蜉蝣目-毛翅目（EPT）成员。与其他溪流（Abirunmu、Awoosun、Mogimogi 和 Aboto）相比，该地点还具有最高程度的自然度、最宽的河道和溶解氧 (DO)，但电导率 (EC) 和总溶解固体 (TDS) 最低，存在兼性和耐胁迫物种，表明受到不同程度的干扰。双变量回归分析证实，河岸森林砍伐和土地利用影响溪流中大型无脊椎动物的分布，因为 EPT 丰度与森林覆盖率之间存在反比关系。此外，DO 与 EPT 类群丰富度呈正相关，但与鞘翅目丰富度和半翅目丰度呈负相关。因此，奥卢米林河被提议作为评估该地区淡水生态完整性的基准。鉴于热带地区人类活动不断升级，需要紧急合作努力保护淡水生物多样性，保护奥卢米林河的河岸走廊，并恢复该地区受损的河流。