Interspecific interactions between coexisting Siberian and Ezo salamander larvae examined by stable isotope analyses

Interspecific interactions between coexisting Siberian and Ezo salamander larvae examined by stable isotope analyses
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通过稳定同位素分析检查共存的西伯利亚蝾螈幼虫和虾夷蝾螈幼虫之间的种间相互作用

DOI:
10.1007/s10201-022-00709-y
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发表时间:
2023
期刊:
影响因子:
1.6
通讯作者:
Atsushi Maruyama
Atsushi Maruyama
中科院分区:
环境科学与生态学4区
文献类型:
--
作者:
Shigeharu Terui ; Tsubasa Furuta ; Yukihiro Kohmatsu ; Atsushi Maruyama

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北海道岛生活着两种蝾螈,西伯利亚蝾螈(Salamandrella keyserlingii)和Ezo蝾螈(Hynobius retardatus),由于它们之间的捕食和/或竞争,它们以前被认为是不相容的。这两个物种从未被发现同域繁殖,直到最近在一个池塘里发现这两个物种同时产卵。我们调查了潜在的种间相互作用,通过确定在这个池塘中共存的种群的营养生态位,利用同位素分析。我们最初进行了水族箱实验,以确定主体δ值的营养区分因子(TDF),这是准确解释野外同位素比所需的。S的δ 15 N和δ 13 C的TDF分别为1.6‰和0.1‰。Keyserlingii和H. retardatus,分别。6月份池塘的δ 15 N和δ 13 C测定结果表明,H.滞育幼虫可捕食S. keyserlingiilarva,但这种捕食者的相互作用已经消退7月,如果有的话。此外,δ值的种间变化表明,这两个物种在7月消耗不同的食物,当两个物种达到同位素稳定状态。因此,我们的结论是,共存的蝾螈幼虫没有连续的捕食者或竞争性的相互作用,预期从他们的独家分销模式。由于池塘中的微生境隔离或S的减少,可以避免不可持续的负种间性。捕食后的种群密度。
Hokkaido Island is inhabited by two salamander species, Siberian salamander (Salamandrella keyserlingii) and Ezo salamander (Hynobius retardatus), which were previously considered incompatible to cohabit due to the predation and/or competition between them. Both species had never been seen reproducing sympatrically until a recent discovery in a pond where the two species spawn concurrently. We investigated their potential interspecific interaction, by identifying the trophic niche of the coexisting populations in this pond using isotope analysis. We initially conducted aquarium experiments to determine the trophic discrimination factor (TDF) of main-bodyδvalues, which are required to accurately interpret the isotope ratios in the field. The TDF ofδ15Nandδ13Cwere 1.6‰ and 0.1‰ forS. keyserlingiiand 1.5‰ and 0.5‰ forH. retardatus, respectively. Theδ15Nandδ13Cresults from the pond in June suggested the possibility thatH. retardatuslarva may prey onS. keyserlingiilarva, but this prey–predator interaction had subsided by July, if ever. Further, the interspecific variations inδvalues suggested that the two species consumed different foods in July, when both species reached isotopic steady states. Thus, we conclude that the coexisting salamander larvae do not have continuous prey–predator or competitive interaction as expected from their exclusive distribution patterns. The unsustainable negative interspecificity may be avoided due to microhabitat segregation in the pond or by a decrease in theS. keyserlingiipopulation density after predation.
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