Temporal constancy of faunal assemblages in 'mesohabitats' - Application to management?

生态学 地理 生物
作者
Patrick D. Armitage,Isabel Pardo,A. J. Brown
出处
期刊:Archiv Fur Hydrobiologie [Schweizerbart]
卷期号:133 (3): 367-387 被引量:96
标识
DOI:10.1127/archiv-hydrobiol/133/1995/367
摘要

Variations in the composition of faunal assemblages in streams are often associated with changes in areas of substrate. An observer walking along the bank finds these areas easy to distinguish and we have used these as our basic ecological unit. Essentially the unit is visually distinct from the bank and we have called it a mesohabitat to introduce a scalar dimension which the term biotope does not have and to distinguish it from microhabitats such as a leaf tip or stone surface and macrohabitats which might include the whole of a reach of river. We wished to test the hypothesis that mesohabitats support specific faunal communities which remain distinct and faithful throughout the seasons and to explore the use of such information in environmental assessment. 10 replicate faunal samples, together with associated depth and velocity measurements, were collected from each of 8 mesohabitats ('Ranunculus fast', 'Ranunculus slow', 'Silt', 'Nasturtium', 'Phragmites', 'Sand', 'Gravel fast' and 'Gravel slow') in spring, summer and autumn from a lowland weeded stream, the Mill Stream, in southern England. Analysis of variance indicated that both abundance and faunal richness varied significantly between and within mesohabitats. The most valiability was noted in 'sand', 'Ranunculus slow', and 'silt'. Variation between mesohabitats was significant for all seasons but there was a tendency for the differences to be greatest in spring samples. Multivariate techniques, DECORANA and CCA (canonical correspondence analysis) showed that in general the mesohabitats selected for study remained distinct from one another but that the degree of separation varied markedly with season. In spring when discharge was high mesohabitats showed considerable overlap on the basis of their faunal communities. As the year progressed and discharge declined so mesohabitats became more distinct. There is a continual expansion and contraction of available mesohabitat. Thus instream macrophyte beds increase at the expense of open water habitat, and marginal vegetation encroaches into the main flow. The stream therefore consists of a dynamic system of mesohabitats whose borders are best defined in low flow periods. The 'distinctness' of the mesohabitats meant that it was possible to determine their proportion along a 300 m reach of the Mill Stream. The application of these data is discussed. This information together with data on the 'quality' (species richness, faunal abundance, rarity) can be used to categorise a stream at reach level and assess the effect of management (flow changes, dredging, bank clearance and weed-cutting) on the distribution of mesohabitats and hence on the faunal assemblages associated with them. This could be considered a more useful scale than point sampling when considering fish and macrophytes as well as invertebrates.

科研通智能强力驱动
Strongly Powered by AbleSci AI
更新
PDF的下载单位、IP信息已删除 (2025-6-4)

科研通是完全免费的文献互助平台,具备全网最快的应助速度,最高的求助完成率。 对每一个文献求助,科研通都将尽心尽力,给求助人一个满意的交代。
实时播报
蓝意完成签到,获得积分0
刚刚
xiaohongmao完成签到,获得积分10
5秒前
8秒前
qweerrtt完成签到,获得积分10
15秒前
15秒前
与共发布了新的文献求助10
16秒前
carly完成签到 ,获得积分10
17秒前
颢懿完成签到 ,获得积分10
20秒前
量子星尘发布了新的文献求助10
21秒前
23秒前
ljc完成签到 ,获得积分10
24秒前
Java完成签到,获得积分10
28秒前
30秒前
鲤鱼安青完成签到 ,获得积分10
32秒前
32秒前
dollarpuff完成签到 ,获得积分10
35秒前
35秒前
mmmmmMM完成签到,获得积分10
42秒前
luckweb完成签到,获得积分10
48秒前
猫的毛完成签到 ,获得积分10
49秒前
nicky完成签到 ,获得积分10
50秒前
麦子完成签到 ,获得积分10
51秒前
51秒前
Wilson完成签到 ,获得积分10
52秒前
luckweb发布了新的文献求助10
52秒前
52秒前
56秒前
59秒前
传奇3应助wujiwuhui采纳,获得10
1分钟前
开心寄松完成签到,获得积分10
1分钟前
北宫完成签到 ,获得积分10
1分钟前
wansida完成签到,获得积分10
1分钟前
QXS完成签到 ,获得积分10
1分钟前
1分钟前
菠萝完成签到 ,获得积分10
1分钟前
领导范儿应助Villanellel采纳,获得10
1分钟前
wintersss完成签到,获得积分10
1分钟前
尹尹发布了新的文献求助10
1分钟前
量子星尘发布了新的文献求助10
1分钟前
zzzzzz完成签到 ,获得积分10
1分钟前
高分求助中
【提示信息,请勿应助】关于scihub 10000
Les Mantodea de Guyane: Insecta, Polyneoptera [The Mantids of French Guiana] 3000
徐淮辽南地区新元古代叠层石及生物地层 3000
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
Handbook of Industrial Diamonds.Vol2 1100
Global Eyelash Assessment scale (GEA) 1000
Picture Books with Same-sex Parented Families: Unintentional Censorship 550
热门求助领域 (近24小时)
化学 材料科学 医学 生物 工程类 有机化学 生物化学 物理 内科学 纳米技术 计算机科学 化学工程 复合材料 遗传学 基因 物理化学 催化作用 冶金 细胞生物学 免疫学
热门帖子
关注 科研通微信公众号,转发送积分 4038066
求助须知:如何正确求助?哪些是违规求助? 3575779
关于积分的说明 11373801
捐赠科研通 3305584
什么是DOI,文献DOI怎么找? 1819239
邀请新用户注册赠送积分活动 892655
科研通“疑难数据库(出版商)”最低求助积分说明 815022