The Ponto-Caspian and native amphipod life history in the Daugava River, Latvia

IF 0.9 4区环境科学与生态学 Q4 OCEANOGRAPHY

Oceanological and Hydrobiological Studies Pub Date : 2022-09-01 DOI:10.26881/oahs-2022.3.03

Jana Paidere, Aija Brakovska

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引用次数: 2

Abstract

Abstract Population structure, reproductive parameters and other life history traits are among the main preconditions for alien amphipods’ successful invasion. In the freshwaters of Northern Europe, i.e. Latvia, the overall life history of alien Ponto-Caspian amphipods is little known. Furthermore, the population structure and reproductivity of native Gammarus pulex have not been studied in Latvian freshwaters. The aim of the study was to describe the life history of Gammarus varsoviensis, Pontogammarus robustoides and the coexistent G. pulex. Their population structure, reproductive period and fecundity in the Daugava River were evaluated as part of this study from 2017 to 2019. The results revealed that the reproductive period of G. varsoviensis and P. robustoides lasted from four to five months, with up to three generations per year and a high proportion of juveniles. The average number of eggs for G. varsoviensis was 31 (maximum: 69) and for P. robustoides 28 (maximum: 81), with ovigerous females of both species being an average of 11.3 mm. Gammarus pulex had one generation per year with a high proportion of juveniles. The average number of eggs per brood was 27 (maximum: 41) with the average size of ovigerous females being 10.7 mm.

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拉脱维亚道加瓦河的蓬托里海和本地两栖动物的生活史

种群结构、生殖参数等生活史特征是外来片脚类动物成功入侵的主要前提条件。在北欧，即拉脱维亚的淡水中，外来的蓬托-里海片脚类动物的整个生活史鲜为人知。此外，拉脱维亚淡水中原生Gammarus pulex的种群结构和繁殖能力尚未得到研究。研究目的是描述varsovienis Gammarus, Pontogammarus robustoides和共存的G. pulex的生活史。在2017年至2019年的研究中，研究人员评估了它们在道加瓦河的种群结构、繁殖期和繁殖力。结果表明，varsoviensis和robustoides的繁殖周期为4 ~ 5个月，每年可达3代，幼虫比例高。varsoviensis的平均卵数为31个(最大69个)，robustoides的平均卵数为28个(最大81个)，两种的雌卵平均为11.3 mm。长尾星每年只有一代，幼鱼的比例很高。每窝平均产卵27枚(最大41枚)，卵生雌虫平均体型10.7 mm。

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来源期刊

Oceanological and Hydrobiological Studies 地学-海洋学

CiteScore

1.70

自引率

11.10%

发文量

审稿时长

>12 weeks

期刊介绍： Oceanological and Hydrobiological Studies is an international journal published by the Institute of Oceanography, University of Gdańsk in Poland. The journal has 4 issues per year and contains papers on all aspects of the marine environment and hydrobiology. All manuscripts are reviewed by editors and independent experts. Based on the referees'' recommendations, the Editor will make a decision on whether to accept a contribution. All articles are published in English. The journal is open to all matters concerning the water environment, thus providing the readers with a wide spectrum of topics in every issue.