泛濫平原濕地位于河流與洪水淹沒(méi)線之間,，包括淺水湖泊,、河漫灘等。泛濫平原濕地與河流的自由水文連通對(duì)維持生物多樣性和生態(tài)健康至關(guān)重要,。由于20世紀(jì)50至70年代的筑壩建閘,，長(zhǎng)江泛濫平原大部分湖泊與干流阻隔，導(dǎo)致生物多樣性銳減,、生物資源衰退,。底棲動(dòng)物可指示環(huán)境的長(zhǎng)期變化，且對(duì)水文條件的改變反應(yīng)敏感,，研究該類群與水文連通度的關(guān)系對(duì)泛濫平原濕地管理和保護(hù)有重要意義,。那么，底棲動(dòng)物在水文連通梯度上的響應(yīng)模式是怎樣的呢,？
近日,，中國(guó)科學(xué)院水生生物研究所潘保柱、王海軍,、梁小民和王洪鑄在底棲生物學(xué)領(lǐng)域重要刊物《北美底棲生物學(xué)會(huì)期刊》（Journal of the North American Benthological Society）(2011, 30(2): 589-602)發(fā)表論文“Macrozoobenthos in Yangtze floodplain lakes: patterns of density, biomass and production in relation to river connectivity”,，回答了這一問(wèn)題,。
通過(guò)2003至2007年間對(duì)長(zhǎng)江泛濫平原30余個(gè)阻隔湖泊、3個(gè)通江湖泊及10個(gè)長(zhǎng)江干流江段的野外生態(tài)調(diào)查,，該文揭示了長(zhǎng)江泛濫平原濕地底棲動(dòng)物群落特征與水文連通度的關(guān)系,。結(jié)果顯示，底棲動(dòng)物的物種多樣性在一定的江湖水文連通度下達(dá)到最大,，且生物量和生產(chǎn)量也同時(shí)達(dá)到最大,。這些結(jié)果不僅證實(shí)了國(guó)外關(guān)于在中等程度的水文連通度下生物多樣性達(dá)到最大的理論，而且首次提出總體生物量也同時(shí)達(dá)到最大,。結(jié)果表明,，適度水文連通對(duì)維持泛濫平原濕地生態(tài)系統(tǒng)健康至關(guān)重要。
該研究受到國(guó)家自然科學(xué)基金委和中國(guó)科學(xué)院的聯(lián)合資助,。（生物谷Bioon.com）
生物谷推薦原文出處：
Journal of the North American Benthological Society
Macrozoobenthos in Yangtze floodplain lakes: patterns of density, biomass, and production in relation to river connectivity
Bao-Zhu Pan, Hai-Jun Wang, Xiao-Min Liang, and Hong-Zhu Wang
A systematic investigation of macrozoobenthos was conducted in Yangtze floodplain waters to reveal patterns of density, biomass, and production in relation to river connectivity. In the Yangtze-connected lakes, 78 taxa belonging to 33 families and 62 genera were identified. Macrozoobenthos density was 327 individuals/m2, biomass was 1.40 g dry mass/m2, and production was 3.23 g dry mass m?2 y?1. The assemblages were characterized by high diversity, high production, and high bivalve-filterer abundance. The key factor determining the macrozoobenthic assemblages was river connectivity. As river connectivity increased, 3 types of response patterns were observed: 1) density, biomass, and production of collector-filterers (mainly Bivalvia), shredders (e.g., Stictochironomus), and predators (e.g., Dytiscidae) showed unimodal changes, i.e., first increased and then decreased; 2) density, biomass, and production of collector-gatherers (mainly Tubificidae and Chironomidae) decreased continuously; and 3) density of scrapers (mainly Gastropoda) decreased, whereas their biomass and production changed unimodally. At an intermediate level of river connectivity, biomass and production of total macrozoobenthos reached maxima, whereas density decreased with increasing river connectivity. Previous research showed that α diversity of zoobenthos also peaks at moderate connectivity with rivers. Therefore, to maintain high productivity as well as high biodiversity in the Yangtze floodplain, protecting the remnants of river-connected lakes and linking disconnected lakes freely with the mainstream are crucial.
