期刊
ECOLOGICAL INDICATORS
卷 83, 期 -, 页码 112-121出版社
ELSEVIER
DOI: 10.1016/j.ecolind.2017.07.062
关键词
Pomatoschistus microps larvae; Fish larvae; Plankton; Stable isotopes; delta N-15; delta C-13; Trophic interations; Minho and Lima estuaries; Temporal changes; Bioindicator; Nitrogen pollution
资金
- Portuguese and European Regional Development funds through the Portuguese Foundation for the Science and Technology (FCT)
- Operational Competitiveness Programme (COMPETE) under the project SIGNAL [PTDC/AAC-AMB/110331/2009, FCOMP-01-0124-FEDER-013876]
- MARE (Marine and Environmental Sciences Centre) strategic plan [ID/MAR/04292/2013]
- FCT [SFRH/BPD/95160/2013, SFRH/BPD/47407/2008]
- European Social Fund
- Ministerio da Educacao e Ciencia (POPH e QREN e Tipologia 4.1) of Portugal
- SIGNAL project [ECOTOXLAB/PTDC/AAC-AMB/110331/2009/BIC/2012-036]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/47407/2008, PTDC/AAC-AMB/110331/2009] Funding Source: FCT
A stable isotope study was carried out to investigate the feeding ecology of the common goby Pomatoschistus microps larvae (Kroyer, 1838), and to assess differences in the response of planktonic food web to nutrient enrichment, in two ecosystems from the Southern European coast with different levels of historical pollution (estuaries of the Minho and Lima Rivers). At each estuary and time (July 2012, November 2012, February 2013, and June 2013), the fish larvae of two size classes (class 0: 0-10 mm; class 1: 10-15 mm), particulate organic matter (POM), and pelagic zooplankton were collected. The stable isotope mixing model SIAR revealed that, despite temporal differences in the relative proportion of prey items ingested, in both estuaries P. microps larvae feed on both planktonic-hyperbenthic food sources, predating mainly on copepods (from 34% to 60%), Mysidacea (from 16% to 28%), and brachyuran zoea (from 14% to 29%). Fish larvae size classes did not differ significantly for delta N-15, and exhibited a very narrow range of the delta C-13 signature. Enriched delta N-15 values of all biota in the Lima estuary throughout the study period, with a marked nitrogen enrichment in colder months, are indicative of higher anthropogenic inputs of nitrogen (e.g. sewage and industrial discharges, agriculture) into this system. The delta N-15 values of fish larvae and other planktonic groups can be a sensitive bioindicator, because they are highly correlated with the nitrogen content of water (ammonium), indicating that this element has transferred through the planktonic food web. Enriched carbon isotope ratios were observed in wanner months, in both estuaries, and the heavier delta C-13 values in Lima are best explained by differences in the degree of marine influence. This research emphasises the utility of stable isotopes in trophic interactions studies, highlighting the relevance of the stable nitrogen isotope of zooplanktonic communities as a reliable bioindicator to detect patterns of anthropogenic nitrogen contamination in estuarine ecosystems.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据