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Importance of freshwater flow in terrestrial-aquatic energetic connectivity in intermittently connected estuaries of tropical Australia

机译：淡水流量在热带澳大利亚间歇性连接河口的陆-水能耦合中的重要性

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摘要

δ~(13) C was used to identify seasonal variations in the importance of autochthonous and allochthonous sources of productivity for fish communities in intermittently connected estuarine areas of Australia's dry tropics. A total of 224 fish from 38 species were collected from six intermittently connected estuarine pools, three in central Queensland (two dominated by C_3 forest and one by C_4 pasture) and three in north Queensland (one dominated by C_3 and two by C_4 vegetation). Samples were collected before and after the wet season. Fish collected in the two forested areas in central Queensland had the lowest δ~(13) C, suggesting a greater incorporation of C_3 terrestrial material. A seasonal variation in δ~(13) C was also detected for these areas, with mean δ~(13)C varying from -20 to -23%o from the pre- to the post-wet season, indicating a greater incorporation of terrestrial carbon after the wet season. Negative seasonal shifts in fish δ~(13)C were also present at the pasture site, suggesting a greater dependence on carbon of riparian vegetation (C_3 Juncus sp.) in the post-wet season. In north Queensland, terrestrial carbon seemed to bernincorporated by fish in the two C_4 areas, as δ~(13)C of most species shifted towards slightly heavier values in the post-wet season. A two-source, one-isotope mixing model also indicated a greater incorporation of carbon of terrestrial origin in the post-wet season. However, no seasonal differences in δ~(13)C were detected for fish from the forested area of north Queensland. Overall, hydrologic connectivity seemed to be a key factor in regulating the ultimate sources of carbon in these areas. It is therefore important to preserve the surrounding habitats and to maintain the hydro-logic regimes as close to natural conditions as possible, for the conservation of the ecological functioning of these areas.
机译：δ〜（13）C用于确定季节性变化对澳大利亚干旱热带地区河口间歇性连接的鱼类群落的生产力的影响。从六个断续相连的河口池中收集了来自38个物种的224条鱼，其中三个在昆士兰州中部（两个由C_3森林控制，一个由C_4牧场控制）和三个在昆士兰州北部（一个由C_3为主并且两个由C_4植被控制）。在雨季之前和之后收集样品。在昆士兰州中部两个森林地区收集的鱼类的δ〜（13）C最低，表明C_3陆地物质的吸收更多。在这些地区还发现了δ〜（13）C的季节性变化，从湿润前到湿润后的平均δ〜（13）C在-20％至-23％o之间变化，表明雨季后的陆地碳。牧场中鱼类δ〜（13）C的季节变化也为负，表明在湿润季节后河岸植被（C_3 Juncus sp。）对碳的依赖性更大。在昆士兰州北部，在两个C_4地区，陆地碳似乎被鱼类吸收，因为大多数物种的δ〜（13）C在后湿润季节向着稍重的方向移动。两源一同位素混合模型也表明，在后湿润季节，陆源碳的吸收更大。然而，昆士兰州北部森林地区的鱼类没有发现δ〜（13）C的季节性差异。总体而言，水文连通性似乎是调节这些地区最终碳源的关键因素。因此，重要的是要保护周围的栖息地，并保持水文状况尽可能接近自然条件，以保护这些地区的生态功能。

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    《Marine biology》 |2010年第9期|P.2071-2086|共16页
  • 作者

    Katya Gisela Abrantes; Marcus Sheaves;

  • 作者单位

    Coastal and Estuary Ecosystem Ecology Laboratory,School of Marine and Tropical Biology, James Cook University,Townsville, QLD 4811, Australia Tasmania Aquaculture and Fisheries Institute,University of Tasmania, Private Bag 49,Hobart, Tasmania 7001, Australia;

    rnCoastal and Estuary Ecosystem Ecology Laboratory,School of Marine and Tropical Biology, James Cook University,Townsville, QLD 4811, Australia;

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