Climatic Oscillations and Copepod Interannual Variation Off Central Algeria (SW Mediterranean Sea)

IF 1.8 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

Marine Ecology-An Evolutionary Perspective Pub Date : 2025-09-16 DOI:10.1111/maec.70042

Lilia Mellak, Aziz Hafferssas, Aldjia Kherchouche-Ait Ouadour

{"title":"Climatic Oscillations and Copepod Interannual Variation Off Central Algeria (SW Mediterranean Sea)","authors":"Lilia Mellak, Aziz Hafferssas, Aldjia Kherchouche-Ait Ouadour","doi":"10.1111/maec.70042","DOIUrl":null,"url":null,"abstract":"<div>\n \n The biodiversity of copepod populations was studied over a 4-year period (2014–2017) in Bou Ismail and Algiers Bays through qualitative and quantitative monitoring. The results support three objectives: (i) the seasonality of copepod abundance subject to temperature, salinity, and food availability (Chl a concentrations) regulations; (ii) the trophodynamics of copepods as prey for gelatinous zooplankton and jellyfish; and (iii) the impact of climate on species abundance patterns. A total of 53 copepod species are recorded and encompass 3 orders (calanoida, cyclopoida and harpacticoida), 20 families, and 31 genera. These are either perennial with Atlantic characters (11 species), neritic (11 species) or bathymetric migrants (14 species). The rare species (Fi < 25%) are qualitatively important (22 species). The abundances are subject to geographical and temporal variability. The functioning of the ecosystems is regulated by characteristic populations, so-called abundant species Temora stylifera, Oithona plumifera, Nannocalanus minor, Neocalanus gracilis, Subeucalanus elongatus, S. monachus, Centropages typicus, C. hamatus, Microcalanus pygmaeus, Mecynocera clausi, Agestus flaccus, A. limbatus, Oncaea mediterranea, Xanthocalanus mixtus, Triconia minuta). By using a Principal Components Analysis, their increase is characterized by a seasonality that is strongly correlated with hydrological (temperature, salinity and chlorophyll a), climatic (NAO index) variations, and is also involved in prey–predator relationships where 4 seasonal trends are described. Multimodal Growth Populations (MGP; Oithona plumifera and Temora stylifera) have affinities for all seasons. Trimodal Growth Populations (TGP; N. minor and O. mediterranea) have winter, spring, and summer affinities. Bimodal Growth Populations (BGP; in spring and summer for M. clausi and E. elongatus elongatus and in winter and spring for S. monachus). Unimodal Growth Populations (UGP; in spring for M. pygmaeus, N. gracilis, A. flaccus, A. limbatus, C. hamatus, C. typicus, X. mixtus and T. minuta). The qualitative distributions of richness species and their occurrence did not show any seasonality.\n </div>","PeriodicalId":49883,"journal":{"name":"Marine Ecology-An Evolutionary Perspective","volume":"46 5","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2025-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Marine Ecology-An Evolutionary Perspective","FirstCategoryId":"99","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1111/maec.70042","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The biodiversity of copepod populations was studied over a 4-year period (2014–2017) in Bou Ismail and Algiers Bays through qualitative and quantitative monitoring. The results support three objectives: (i) the seasonality of copepod abundance subject to temperature, salinity, and food availability (Chl a concentrations) regulations; (ii) the trophodynamics of copepods as prey for gelatinous zooplankton and jellyfish; and (iii) the impact of climate on species abundance patterns. A total of 53 copepod species are recorded and encompass 3 orders (calanoida, cyclopoida and harpacticoida), 20 families, and 31 genera. These are either perennial with Atlantic characters (11 species), neritic (11 species) or bathymetric migrants (14 species). The rare species (Fi < 25%) are qualitatively important (22 species). The abundances are subject to geographical and temporal variability. The functioning of the ecosystems is regulated by characteristic populations, so-called abundant species Temora stylifera, Oithona plumifera, Nannocalanus minor, Neocalanus gracilis, Subeucalanus elongatus, S. monachus, Centropages typicus, C. hamatus, Microcalanus pygmaeus, Mecynocera clausi, Agestus flaccus, A. limbatus, Oncaea mediterranea, Xanthocalanus mixtus, Triconia minuta). By using a Principal Components Analysis, their increase is characterized by a seasonality that is strongly correlated with hydrological (temperature, salinity and chlorophyll a), climatic (NAO index) variations, and is also involved in prey–predator relationships where 4 seasonal trends are described. Multimodal Growth Populations (MGP; Oithona plumifera and Temora stylifera) have affinities for all seasons. Trimodal Growth Populations (TGP; N. minor and O. mediterranea) have winter, spring, and summer affinities. Bimodal Growth Populations (BGP; in spring and summer for M. clausi and E. elongatus elongatus and in winter and spring for S. monachus). Unimodal Growth Populations (UGP; in spring for M. pygmaeus, N. gracilis, A. flaccus, A. limbatus, C. hamatus, C. typicus, X. mixtus and T. minuta). The qualitative distributions of richness species and their occurrence did not show any seasonality.

查看原文本刊更多论文

阿尔及利亚中部海域（地中海西南部）气候振荡和桡足类动物年际变化

通过定性和定量监测，研究了2014-2017年bouismail湾和阿尔及尔湾4年期间桡足类种群的生物多样性。结果支持三个目标：(i)桡足动物丰度受温度、盐度和食物可得性（Chl a浓度）调节的季节性；（ii）作为胶状浮游动物和水母猎物的桡足类动物的营养动力学；(3)气候对物种丰度格局的影响。共记录桡足类53种，隶属于棘足目、环足目和棘足目3目、20科31属。它们要么是具有大西洋特征的多年生物种（11种），要么是浅海物种（11种），要么是深海洄游物种（14种）。稀有物种（Fi < 25%）在质量上很重要（22种）。丰度受地理和时间变化的影响。生态系统的功能受特征种群的调节，即所谓的丰富物种，即花柱Temora， Oithona plumifera, Nannocalanus minor, Neocalanus gracilis, Subeucalanus elongatus， S. monachus, centrropages typicus， C. hamatus, Microcalanus pygmaus, Mecynocera clausi, Agestus flaccus， A. limbatus, Oncaea mediterranea, Xanthocalanus mixtus, Triconia minuta)。通过使用主成分分析，它们的增加具有季节性特征，与水文（温度、盐度和叶绿素a）、气候（NAO指数）变化密切相关，并且还涉及猎物-捕食者关系，其中描述了4个季节性趋势。多模式生长种群（MGP； Oithona plumifera和Temora stylifera）在所有季节都有亲和力。三峰生长种群（TGP； N. minor和O. mediterranea）具有冬季、春季和夏季亲和力。双峰生长种群（双峰生长种群，春、夏两季为克氏鼠和长尾鼠，冬、春两季为monachus）。单峰生长种群（UGP；春季为pygmaeus、N. gracilis、A. flaccus、A. limbatus、C. hamatus、C. typicus、X. mixtus和T. minuta）。丰富度物种及其发生的定性分布不具有季节性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Marine Ecology-An Evolutionary Perspective 生物-海洋与淡水生物学

CiteScore

2.70

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Marine Ecology publishes original contributions on the structure and dynamics of marine benthic and pelagic ecosystems, communities and populations, and on the critical links between ecology and the evolution of marine organisms. The journal prioritizes contributions elucidating fundamental aspects of species interaction and adaptation to the environment through integration of information from various organizational levels (molecules to ecosystems) and different disciplines (molecular biology, genetics, biochemistry, physiology, marine biology, natural history, geography, oceanography, palaeontology and modelling) as viewed from an ecological perspective. The journal also focuses on population genetic processes, evolution of life histories, morphological traits and behaviour, historical ecology and biogeography, macro-ecology and seascape ecology, palaeo-ecological reconstruction, and ecological changes due to introduction of new biota, human pressure or environmental change. Most applied marine science, including fisheries biology, aquaculture, natural-products chemistry, toxicology, and local pollution studies lie outside the scope of the journal. Papers should address ecological questions that would be of interest to a worldwide readership of ecologists; papers of mostly local interest, including descriptions of flora and fauna, taxonomic descriptions, and range extensions will not be considered.