Jana Sarmistha, Pahari Priti R, Dutta Tapan Kr, Bhattacharya Tanmay
Department of Zoology, Vidyasagar University, Midnapore, India.
J Environ Biol. 2009 Mar;30(2):283-7.
In total 20 species of aquatic insects have been recorded from a weed infested pond. Odonata was numerically the most abundant group constituting of 54% of the total aquatic insects even though these belonged to three species. Coleoptera though constituted only 22% of aquatic insects had 10 species. Urothemis signata and Ranatra filliformes were eudominant and dominant species respectively. Hydrometra butlen is recorded from West Bengal for the first time. Five species of Hemiptera, Ranatra filiformes, Ranatra elongata, Diplonychus rusticus, Micronecta merope, Genis nitida and Hydrometra butlen; three species of Odonata, Urothemis signata, Agriocnemis pygmoea and Enllagma parvum and one species of Coleoptera viz., Coplatus indicus have been recorded from Paschim Medinipore district for the first time. Species diversity and evenness indices fluctuated from month to month and from one sampling site to other being <1 suggest a stressed and disturbed environment.
在一个杂草丛生的池塘中总共记录到了20种水生昆虫。尽管蜻蜓目仅包含3个物种，但在数量上却是最丰富的类群，占水生昆虫总数的54%。鞘翅目虽然仅占水生昆虫的22%，但有10个物种。印度环纹蟌和长鼻水黾分别是优势度极高和优势度高的物种。布氏水黾首次在西孟加拉邦被记录到。半翅目的5个物种，长鼻水黾、长形水黾、瘤同蝽、小沼蝽、亮异蝽和布氏水黾；蜻蜓目的3个物种，印度环纹蟌、小绿蟌和小环尾春蜓；以及鞘翅目的1个物种，即印度扁泥甲，均首次在西孟加拉邦的西米德纳布尔地区被记录到。物种多样性和均匀度指数每月以及从一个采样点到另一个采样点都有波动，小于1表明环境处于压力和干扰状态。
