新西兰怀卡托河流域下游湖养星系幼虫的首次观察和早期生活史方面

IF 1.4 4区 环境科学与生态学 Q3 FISHERIES
B. David, Matt G. Jarvis, D. Özkundakci, Josh Smith, I. Duggan, Sung Soo Koh, Jason M. Augspurger, T. King
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引用次数: 1

摘要

摘要:新西兰许多溯河产卵淡水鱼的幼体行为没有得到充分的描述。然而,许多两栖产卵物种的产卵并不是强制性的,在条件合适的情况下,可以促进淡水幼虫的饲养。在湖泊中发生这种情况的地方,有机会记录支持幼虫饲养的成分和条件。连续四个冬天,在怀卡托河下游的九个低地湖泊进行了船拖网捕鱼,重点是galaxiids幼虫。Galaxiid幼虫在除一个湖泊外的所有湖泊的地表水栖息地都被捕获,其中带状的kōkopu(Galaxias fasciatus)和巨型的kßkobu(Galaxis argerteus)是最常见的物种。其中一个湖,瓦希湖,一直以来都是花费了大量精力捕获加拉希人最多的湖泊。对该湖和其他湖泊的幼虫的分析表明,两种大小的幼虫在渔获物中占主导地位,较大、较老的幼虫主要是斑螯蟹,而较小、较年轻的幼虫主要为银螯蟹。胃内容物表明,两种非本地浮游动物在幼虫的饮食中占主导地位,即全北极水蚤、大风水蚤和澳大利亚浮游桡足类Boeckella symmetrica。这项研究提供了关于该流域本地鱼类物种的时间、运动和预测招募的新信息,对湖泊和河流管理具有重要意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
First observations and early life-history aspects of lake rearing galaxiid larvae in the lower Waikato River Basin, New Zealand
ABSTRACT Larval behaviour for many of New Zealand’s diadromous freshwater fish is inadequately described. Diadromy for many amphidromous species is not obligatory however, and where conditions are suitable, freshwater larval rearing may be facilitated. Where this occurs in lakes, opportunities to document the composition and conditions supporting larval rearing exist. Boat trawling was undertaken across nine lowland lakes in the Lower Waikato over four consecutive winters with a focus on larval galaxiids. Galaxiid larvae were captured in surface water habitats in all but one lake, with banded kōkopu (Galaxias fasciatus) and giant kōkopu (Galaxias argenteus) the most common species detected. One lake, Lake Waahi, consistently resulted in the most galaxiid captures for effort expended. Analyses of larvae from this and other lakes indicated that two sizes predominated in catches and that larger, older larvae were predominantly G. fasciatus while smaller, younger larvae were predominantly G. argenteus. Stomach contents indicated that two non-native zooplankton species predominated in the diet of larvae, the Holarctic daphnia, Daphnia galeata, and the Australian calanoid copepod Boeckella symmetrica. This study provides new information regarding the timing, movement and predicted recruitment of native fish species in this river basin that has important implications for lake and river management.
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来源期刊
CiteScore
4.50
自引率
12.50%
发文量
35
审稿时长
3 months
期刊介绍: Aims: The diversity of aquatic environments in the southern continents and oceans is of worldwide interest to researchers and resource managers in research institutions, museums, and other centres. The New Zealand Journal of Marine and Freshwater Research plays an important role in disseminating information on observational, experimental, theoretical and numerical research on the marine, estuarine and freshwater environments of the region.
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