当前位置: X-MOL 学术N. Z. J. Mar. Freshw. Res. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Freshwater migratory movements in a widely distributed New Zealand amphidromous fish Cheimarrichthys fosteri
New Zealand Journal of Marine and Freshwater Research ( IF 1.6 ) Pub Date : 2021-09-08 , DOI: 10.1080/00288330.2021.1973516
Manna L. Warburton 1, 2 , Ryan R. Easton 1 , Gerard P. Closs 1
Affiliation  

ABSTRACT

Amphidromous fishes engage in migration to overcome the spatial mismatch between adult and larval habitat. The torrentfish (Cheimarrichthys fosteri), an endemic New Zealand amphidromous fish and only member of the Family Cheimarrichthyidae, display distinct spatial sexual segregation, but the migration assumed to overcome this segregation for reproduction is undocumented. We investigated the instream distribution of torrentfish, gaining insight into how barriers to reproduction are overcome, and how sex shapes migratory choices for the individual. We surveyed torrentfish at two spatial scales, examining the effects of sex and sexual maturity on distribution. We found that female torrentfish engage in prolonged upstream migrations, up to 100 km inland, with male torrentfish migrating upstream to a lesser extent. Both sexes return downstream to spawn, with males returning at the onset of maturity, while females may return and migrate back upstream, potentially making multiple downstream spawning migrations. Juvenile upstream migration likely results in competitive release and access to resources, but sets up a conflict between reproduction and transport of larvae into the nursery habitat in a timely manner. Adult downstream migration in torrentfish resolves this conflict and is similar to documented downstream spawning migrations in catadromous species.



中文翻译:

广泛分布的新西兰双性鱼 Cheimarrichthys fakei 的淡水洄游运动

摘要

双性鱼类通过迁徙来克服成鱼和幼鱼栖息地之间的空间不匹配。激流鱼 ( Cheimarrichthys fakei)是一种新西兰特有的两栖性鱼类,也是 Cheimarrichthyidae 科的唯一成员,表现出明显的空间性别隔离,但没有记录为克服这种繁殖隔离而进行的迁徙。我们调查了激流鱼的河内分布,深入了解如何克服繁殖障碍,以及性别如何影响个体的迁徙选择。我们在两个空间尺度上调查了激流鱼,研究了性别和性成熟度对分布的影响。我们发现雌性激流鱼会进行长时间的上游洄游,最远可达内陆100公里,而雄性激流鱼则向上游洄游的程度较小。两性都会返回下游产卵,雄性在成熟时返回,而雌性可能会返回并迁回上游,可能会进行多次下游产卵迁徙。幼虫向上游迁徙可能会导致竞争性释放和获取资源,但会在幼虫的繁殖和及时运输到苗圃栖息地之间造成冲突。激流鱼的成体向下游洄游解决了这一冲突,并且类似于有记录的降水物种的下游产卵洄游。

更新日期:2021-09-08
down
wechat
bug