亲爱的研友该休息了!由于当前在线用户较少,发布求助请尽量完整地填写文献信息,科研通机器人24小时在线,伴您度过漫漫科研夜!身体可是革命的本钱,早点休息,好梦!

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
Akim应助拼搏的二哈采纳,获得10
3秒前
6秒前
hob完成签到,获得积分10
6秒前
凉的白开完成签到,获得积分10
7秒前
weixiaosi完成签到 ,获得积分10
10秒前
WATeam发布了新的文献求助10
11秒前
13秒前
leave完成签到 ,获得积分10
13秒前
明理晓霜发布了新的文献求助10
18秒前
21秒前
可爱的函函应助酷酷白萱采纳,获得10
22秒前
酷酷白萱完成签到,获得积分20
32秒前
35秒前
无花果应助ceeray23采纳,获得20
36秒前
棣棣完成签到,获得积分10
39秒前
00完成签到,获得积分10
41秒前
c2发布了新的文献求助10
41秒前
小汤完成签到,获得积分20
44秒前
舟舟完成签到 ,获得积分10
54秒前
linkman发布了新的文献求助10
57秒前
linkman发布了新的文献求助30
57秒前
linkman发布了新的文献求助10
57秒前
1分钟前
1分钟前
1分钟前
1分钟前
003完成签到,获得积分10
1分钟前
Splaink完成签到 ,获得积分10
1分钟前
经年发布了新的文献求助10
1分钟前
1分钟前
1分钟前
短短急个球完成签到,获得积分10
1分钟前
1分钟前
ceeray23发布了新的文献求助20
1分钟前
科研通AI2S应助科研通管家采纳,获得10
1分钟前
1分钟前
linkman完成签到,获得积分10
1分钟前
Cain发布了新的文献求助10
1分钟前
123123完成签到 ,获得积分10
1分钟前
经年完成签到,获得积分20
1分钟前
高分求助中
The Mother of All Tableaux: Order, Equivalence, and Geometry in the Large-scale Structure of Optimality Theory 3000
A new approach to the extrapolation of accelerated life test data 1000
ACSM’s Guidelines for Exercise Testing and Prescription, 12th edition 500
Indomethacinのヒトにおける経皮吸収 400
Phylogenetic study of the order Polydesmida (Myriapoda: Diplopoda) 370
基于可调谐半导体激光吸收光谱技术泄漏气体检测系统的研究 350
Robot-supported joining of reinforcement textiles with one-sided sewing heads 320
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 3990012
求助须知:如何正确求助?哪些是违规求助? 3532068
关于积分的说明 11256227
捐赠科研通 3270933
什么是DOI,文献DOI怎么找? 1805123
邀请新用户注册赠送积分活动 882270
科研通“疑难数据库(出版商)”最低求助积分说明 809216