Marine environmental research最新文献_第3页

Effect of monsoonal rainfall and tides on salinity intrusion and mixing dynamics in a macrotidal estuary 季风降雨和潮汐对大潮河口盐度入侵和混合动力学的影响

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 DOI: 10.1016/j.marenvres.2024.106791

Nay Oo Hlaing, Gubash Azhikodan, Katsuhide Yokoyama

Studies on the temporal and spatial variations of estuarine hydrodynamics, particularly those focusing on the combination of extreme and transition periods in the estuary with seasonal fluctuation of discharge, are rarely reported. Due to its importance, this study investigates the effect of rainfall and tide on the salinity intrusion and mixing conditions in the monsoon-affected macrotidal Tanintharyi River estuary (TRE), Myanmar, during the period of 2017–2019. The maximum salinity intrusion and partially mixed to well-mixed conditions were found during the neap-spring tidal cycles of dry seasons. The minimum salinity intrusion, along with partially mixed to stratified conditions, was found during spring to neap tidal cycles of wet seasons. Further, the transitional periods before and after the wet season have different salinity intrusion and mixing conditions based on the different discharge fluctuations in the past months. The salinity intrusion and mixing conditions in the TRE were largely influenced by the lack of rainfall during the dry season, whereas the combined effect of rainfall and the tidal range dominated during the wet season. Finally, the salinity interface gradient (SIG₁₀) index was found to be the convenient index to examine the mixing condition of a large area compared to the traditional indices because of the minimum data requirement with easiness of calculation by using the reference figures from the published articles.

有关河口水动力时空变化的研究，特别是有关河口极端时期和过渡时期与季节性排水量波动相结合的研究很少见报道。鉴于其重要性，本研究调查了 2017-2019 年期间降雨和潮汐对缅甸受季风影响的大潮汐丹林达里河口（Tanintharyi River Estuary，TRE）盐度入侵和混合状况的影响。在旱季的新春潮汐周期，盐度入侵最大，部分混合至混合良好。而在雨季的春季至次年的潮汐周期中，盐度入侵和部分混合至分层条件最小。此外，根据过去几个月不同的排水量波动情况，雨季前后的过渡时期具有不同的盐度入侵和混合状况。在旱季，TRE 的盐度入侵和混合状况主要受降雨量不足的影响，而在雨季，降雨量和潮差的综合影响则占主导地位。最后，与传统的指数相比，盐度界面梯度（SIG10）指数被认为是便于考察大面积混合状况的指数，因为它对数据的要求最低，而且利用已发表文章中的参考数据即可轻松计算。

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引用次数: 0

Uncovering foraminiferal assemblages in Pulau Redang and the importance of FoRAM index calibration for reef monitoring in South China sea 发现普劳雷当的有孔虫集合体以及 FoRAM 指数校准对南海珊瑚礁监测的重要性。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 DOI: 10.1016/j.marenvres.2024.106825

Fatin Izzati Minhat , Che Din Mohd Safuan , Sabrina Alia Mohd Emran , Aida Farisah Mohd Hasnizul , Aminudin Muhammad Afiq-Firdaus , Zainudin Bachok , Wan Izatul Asma Wan Talaat

To mitigate adverse effects of ocean warming on coral reef degradation, resource managers increasingly explore management and regulation of local stressors to strengthen coral resilience and recovery. Comprehensive assessments and monitoring efforts offer a holistic understanding of reef dynamic ecosystems. In this study, we documented the distribution of benthic foraminiferal assemblages surrounding Pulau Redang, Malaysia, and assessed their potential for monitoring coral reef health using the Foraminifera in Reef Assessment and Monitoring (FoRAM) Index. Undeveloped (R1–R3) and developed (R4–R6) reef sites revealed distinct differences in reef conditions. Foraminiferal distribution showed Amphistegina lessonii (14–34%) as the dominant species, followed by Calcarina hispida (21%) and Calcarina mayori (19%). The Q-mode cluster analysis classified the distribution of foraminiferal assemblages in Pulau Redang into four sub-groups based on the reef ecological conditions. Group A1 and A2, represent the foraminiferal assemblage on the undeveloped west side of the island where live coral cover was >30%. Meanwhile, Group B1 and B2 represent the assemblage found in developed coastal regions with low live coral cover (≤20%). Additionally, the CCA results revealed a substantial influence of substrate type on the distribution of benthic foraminifera in the reef environments of Pulau Redang. FoRAM index consistently yielded high values across the study area despite varying coral reef conditions, probably due to the prevalence of Calcarina mayori in mesotrophic reefs (R4–R6), potentially distorting FoRAM values and providing a misleading indicator of reef conditions. The Modified Foram Index (MFI), calculated by excluding calcarinids, classified R3, R4, and R6 as less conducive for reef growth, aligning better with observed reef conditions. We recommend calibrating the FoRAM Index, particularly in mesotrophic reefs where calcarinids dominate foraminiferal assemblages, to enhance its precision and reliability for coral reef health monitoring and assessment within the region.

为了减轻海洋变暖对珊瑚礁退化的不利影响，资源管理人员越来越多地探索如何管理和调节当地的压力因素，以加强珊瑚的恢复力和复原能力。全面的评估和监测工作有助于全面了解珊瑚礁的动态生态系统。在这项研究中，我们记录了马来西亚雷当岛（Pulau Redang）周围底栖有孔虫群的分布情况，并利用珊瑚礁评估与监测有孔虫指数（FoRAM）评估了它们在监测珊瑚礁健康状况方面的潜力。未开发（R1-R3）和已开发（R4-R6）的珊瑚礁地点显示了珊瑚礁状况的明显差异。有孔虫分布显示，Amphistegina lessonii（14-34%）是主要种类，其次是Calcarina hispida（21%）和Calcarina mayori（19%）。Q 模式聚类分析根据珊瑚礁的生态条件将有孔虫的分布分为四个亚组。A1 和 A2 组代表未开发的岛屿西侧的有孔虫群落，那里的活珊瑚覆盖率大于 30%。而 B1 和 B2 组则代表在沿海发达地区发现的有孔虫群落，其活珊瑚覆盖率较低（≤20%）。此外，CCA 结果表明，底质类型对有孔虫在普劳雷登礁环境中的分布有很大影响。尽管珊瑚礁条件各不相同，但整个研究区域的 FoRAM 指数始终保持高值，这可能是由于 Calcarina mayori 在中营养珊瑚礁（R4-R6）中的普遍存在，可能会扭曲 FoRAM 值，并提供一个误导性的珊瑚礁条件指标。通过剔除钙钛矿，计算出的修正峡湾指数（MFI）将 R3、R4 和 R6 划分为较不利于珊瑚礁生长的区域，更符合观测到的珊瑚礁条件。我们建议校准 FoRAM 指数，特别是在有孔虫类占主导地位的中营养珊瑚礁，以提高其在该地区珊瑚礁健康监测和评估方面的精确性和可靠性。

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引用次数: 0

Assessing the diversity and species composition in macroinvertebrate assemblages thriving in shallow water macroalgal habitats: Structural complexity is not always better. 评估浅水大型藻类栖息地大型无脊椎动物群落的多样性和物种组成：结构复杂并不总是更好。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 Epub Date: 2024-10-28 DOI: 10.1016/j.marenvres.2024.106818

Susana Pinedo, Esther Jordana, Enric Ballesteros

The assemblages of motile and sessile macroinvertebrates [mainly arthropods (peracarids), mollusks and annelids] were studied in three shallow macroalgal habitats from the NW Mediterranean Sea. Habitats were respectively dominated by three macroalgae: Ericaria mediterranea, a canopy-forming fucoid with repeatedly ramified cylindrical branches and spine-like projections; Cystoseira compressa, a canopy-forming fucoid with occasionally ramified compressed branches; and Ellisolandia elongata, a turf-forming, repeatedly branched, geniculate calcified alga. A total of 175,800 macroinvertebrate specimens, belonging to 228 taxa were collected. Macroinvertebrate assemblages in E. mediterranea habitat showed the highest abundances and number of taxa (104,412 specimens and 184 taxa), followed by those from C. compressa (49,128 specimens and 157 taxa) and E. elongata habitats (22,260 specimens and 144 taxa). Annelids were the most diverse group (43% of taxa) and amphipods the most abundant (78% of individuals). Macroinvertebrate abundances, alpha-diversity and species composition significantly differed among habitats and/or sites, while the number of taxa did not show significant differences neither among sites nor among habitats. Despite the simpler morphology of E. elongata respect to fucoid species, E. elongata habitat registered the lowest macrofauna abundance values but the highest alpha-diversity. Amphipods were the most abundant group in fucoid algae habitats (82-85%), while bivalves dominated in E. elongata one. Annelid polychaetes were the third more abundant group. Macroinvertebrate assemblages thriving in E. elongata habitat were always different to those found in fucoid algae habitats. Amphipods Protohyale schmidtii, Jassa herdmani, Jassa morinoi and Stenothoe gallensis were the most abundant species in fucoid algae habitats, while several species of Mytilidae, together with Caprella liparotensis, S. gallensis and nematodes dominated in E. elongata turfs. Differences observed are explained according to differences in algal morphological complexity and natural variability.

在地中海西北部的三个浅海大型藻类生境中，研究了活动和无梗大型无脊椎动物（主要是节肢动物（peracarids）、软体动物和环节动物）的组合。这些生境分别以三种大型藻类为主：地中海褐藻（Ericaria mediterranea）是一种形成冠层的褐藻，具有反复横生的圆柱形分支和刺状突起；压缩褐藻（Cystoseira compressa）是一种形成冠层的褐藻，偶尔具有横生的压缩分支；埃利索兰藻（Ellisolandia elongata）是一种形成草皮的褐藻，具有反复横生的分支和膝状钙化藻。共收集到 175 800 个大型无脊椎动物标本，属于 228 个分类群。E.mediterranea栖息地的大型无脊椎动物群的丰度和类群数量最高（104 412 个标本和 184 个类群），其次是 C. compressa（49 128 个标本和 157 个类群）和 E. elongata（22 260 个标本和 144 个类群）栖息地的大型无脊椎动物群。无脊椎动物是种类最多的类群（占分类群的 43%），片脚类动物数量最多（占个体的 78%）。不同栖息地和/或地点的大型无脊椎动物丰度、α-多样性和物种组成存在显著差异，而不同地点和不同栖息地的分类群数量则无显著差异。尽管与褐藻类相比，长尾藻的形态较为简单，但长尾藻栖息地的大型底栖生物丰度值最低，α-多样性却最高。两足类是褐藻栖息地中数量最多的类群（82-85%），而双壳类在长尾藻栖息地中占主导地位。无脊椎多毛类是数量第三多的类群。在 E. elongata 生境中生长的大型无脊椎动物群与在褐藻生境中发现的大型无脊椎动物群总是不同。片脚类动物 Protohyale schmidtii、Jassa herdmani、Jassa morinoi 和 Stenothoe gallensis 是褐藻栖息地中最丰富的物种，而贻贝科的几个物种以及 Caprella liparotensis、S. gallensis 和线虫在 E. elongata 草皮中占主导地位。观察到的差异可根据藻类形态复杂性和自然变异性的差异来解释。

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引用次数: 0

The role of larval transport on recruitment dynamics of red mullet (Mullus barbatus) in the Central Mediterranean Sea 地中海中部红鲻鱼（Mullus barbatus）幼体迁移对招募动态的作用

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 DOI: 10.1016/j.marenvres.2024.106814

F. Quattrocchi , F. Fiorentino , F. Gargano , G. Garofalo

Recruitment success depends on external forcing mechanisms such as ocean currents that affect the transport of eggs and larvae to favorable habitats. In this study, we investigated the role of larval transport in the recruitment of Mullus barbatus in the Central Mediterranean Sea by modeling the recruits' abundance as a function of both spawning stock size and dispersal rates of the species’ early life stages. Our analysis involved twenty years of data on recruits and spawners abundance obtained from scientific trawl surveys, and data on larval dispersal rates derived from a combination of actualized published sources and original data. By calculating the estimates of retention, import and uniformity of the contribution of the spawning areas distributed among different Geographical Sub Areas (GSAs) in the Sicilian nurseries, we assessed their contribution to recruitment using modified Ricker stock size-recruits models. In particular, our results show that a high uniform contribution from spawning areas within GSA16, mainly related to the oceanographic patterns promoting larval retention, together with spawners abundance, significantly reduced the variability of red mullet recruitment. We further highlighted that when switching from a higher to a lower level of evenness of contribution to the recruit population from different spawning areas in the GSA16, the expected spawning stock abundance per recruit for a given fishing pattern can suffer a rapid short-term decline, which is likely to have negative consequences for stock assessment and management decisions. Our results suggest that larval transport plays a crucial role in explaining the interannual variability of recruitment, thereby contributing to a better understanding of stock size variation. Additionally, our study enhances the understanding of the spatial dynamics involved in the recruitment of this species, which is of increasing interest within fisheries management frameworks.

繁殖成功与否取决于外部作用机制，如洋流，洋流会影响卵和幼体向有利生境的迁移。在这项研究中，我们通过模拟产卵种群规模和该物种早期生命阶段的扩散率，研究了幼体迁移在地中海中部鲃鱼类新陈代谢中的作用。我们的分析涉及二十年来从科学拖网调查中获得的新鱼和产卵鱼丰度数据，以及从实际出版资料和原始数据中获得的幼鱼扩散率数据。通过计算西西里育苗场中不同地理分区（GSA）产卵区的留存、输入和均匀性，我们使用修正的里克种群大小-新鱼种模型评估了它们对新鱼种的贡献。特别是，我们的结果表明，GSA16 内产卵区的均匀贡献率很高，这主要与促进幼体滞留的海洋模式有关，再加上产卵者的丰度，大大降低了鲻鱼补充量的变化。我们进一步强调，当来自 GSA16 不同产卵区的新鱼群的均匀度从较高水平转为较低水平时，特定捕捞模式下每个新鱼群的预期产卵种群丰度会在短期内迅速下降，这可能会对种群评估和管理决策产生负面影响。我们的研究结果表明，幼体迁移在解释繁殖量的年际变化方面起着至关重要的作用，从而有助于更好地理解种群大小的变化。此外，我们的研究还加深了人们对该物种繁殖所涉及的空间动态的理解，这在渔业管理框架中越来越受到关注。

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引用次数: 0

Expanding sample volume for microscopical detection of nanoplastics 扩大纳米塑料显微检测的样品量。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 DOI: 10.1016/j.marenvres.2024.106806

Arto Hiltunen , Joona Huopalainen , Ermei Mäkilä , Sirkku Häkkilä , Pia Damlin , Jari Hänninen

The extent of nanoplastic pollution has raised severe environmental and health concerns. While the means for microplastic detection are abundant, improved tools for nanoplastic detection are called-for. State-of-the-art microscopic techniques can detect nanoplastics down to tens of nanometers, however, only from small sample sizes (typically

\sim

10 μ l

). In this work, we describe a method that enables sampling of 1 l of seawater by the means of correlative Raman- and SEM-techniques. This is achieved by adapting common microplastic sample purification protocols to suit the nanoplastic study. In addition, we decorate a membrane filter with SERS-property to amplify the Raman signals. Together, the purification method combined with the use of the SERS-activated-membrane-filter enables identification and imaging of individual nanoplastic particles from significantly larger sample sizes than before. In the nanoscale the average recovery rate is 5 %. These results aim to provide useful tools for researchers in the fight against plastic pollution.

纳米塑料污染的严重程度引起了人们对环境和健康的严重关注。虽然微塑料检测手段十分丰富，但纳米塑料检测工具仍有待改进。最先进的显微镜技术可以检测到数十纳米的纳米塑料，但只能从小样本量（通常为 ∼10μl）开始。在这项工作中，我们介绍了一种利用拉曼和扫描电镜相关技术对 1 升海水进行采样的方法。这是通过调整常见的微塑料样品纯化协议以适应纳米塑料研究而实现的。此外，我们还装饰了具有 SERS 性能的膜过滤器，以放大拉曼信号。这种纯化方法与 SERS 激活膜过滤器的使用相结合，可以从比以前大得多的样品中识别单个纳米塑料颗粒并对其进行成像。在纳米尺度上，平均回收率为 5%。这些成果旨在为研究人员提供有用的工具，以对抗塑料污染。

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引用次数: 0

Acoustic telemetry suggests the lesser spotted dogfish Scyliorhinus canicula stays and uses habitats within a French offshore wind farm 声学遥测表明，小斑狗鱼（Scyliorhinus canicula）会停留并使用法国海上风电场内的栖息地。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 DOI: 10.1016/j.marenvres.2024.106802

Pierre Labourgade , Lydie I.E. Couturier , Jérôme Bourjea , Mathieu Woillez , Eric Feunteun , Jan T. Reubens , Thomas Trancart

Offshore wind farms (OWF) are a rapidly expanding renewable energy source, but their effects on marine wildlife need further investigation. These infrastructures form new artificial habitats that may modify the behaviour and spatial distribution of fish species. Among the species likely to be affected, benthic sharks occupying coastal habitats are particularly exposed to the development of OWF, especially as electrosensitive species. This study used passive acoustic telemetry to investigate the behaviour of a benthic shark, the lesser-spotted dogfish Scyliorhinus canicula, within France's first operational OWF. Most tagged sharks remained in the vicinity of the OWF post-release, exhibiting site fidelity and seasonal residency with reduced presence during winter when water temperatures are the lowest. The primary site frequented is a monopile with scour protection on soft substrate, offering potential shelters and food sources. This study provides new insights into the species' ecology and contributes to improving our understanding of how anthropogenic structure installation in the marine environment affects the behaviour of S. canicula.

海上风电场（OWF）是一种快速发展的可再生能源，但其对海洋野生动物的影响还需要进一步研究。这些基础设施形成了新的人工栖息地，可能会改变鱼类物种的行为和空间分布。在可能受到影响的物种中，占据沿海栖息地的底栖鲨鱼尤其容易受到 OWF 开发的影响，特别是作为电敏感物种。这项研究利用被动声学遥测技术调查了底栖鲨鱼--小斑狗鱼（Scyliorhinus canicula）在法国首个运行中的 OWF 中的行为。大多数被标记的鲨鱼在释放后都留在了 OWF 附近，表现出对地点的忠实性和季节性居住性，在水温最低的冬季出现的次数减少。鲨鱼经常出没的主要地点是软底质上具有冲刷保护功能的单桩，这为鲨鱼提供了潜在的庇护所和食物来源。这项研究为我们了解该物种的生态学提供了新的视角，有助于加深我们对海洋环境中人为结构安装如何影响 S. canicula 行为的理解。

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引用次数: 0

Corrigendum to "A functional perspective on the factors underpinning biomass-bound carbon stocks in coastal macrophyte communities" [Mar. Environ. Res. 193 (2024) 106289]. 从功能角度看沿海大型植物群落生物量结合碳储量的基础因素》[Mar. Environ. Res. 193 (2024) 106289]更正。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-11-01 Epub Date: 2024-09-21 DOI: 10.1016/j.marenvres.2024.106748

Roel Lammerant, Alf Norkko, Camilla Gustafsson

引用次数: 0

Recurrent marine heatwaves compromise the reproduction success and long-term viability of shallow populations of the Mediterranean gorgonian Eunicella singularis 反复出现的海洋热浪损害了地中海芡实 Eunicella singularis 浅海种群的繁殖成功率和长期生存能力。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-10-30 DOI: 10.1016/j.marenvres.2024.106822

Julia Sarda , Andrea Gori , Ruth Doñate-Ordóñez , Núria Viladrich , Federica Costantini , Joaquim Garrabou , Cristina Linares

Mediterranean gorgonians are being threatened by the impact of recurrent extreme climatic events, such as marine heatwaves (MHWs). The white gorgonian Eunicella singularis was suggested to be the most resistant gorgonian species in the NW Mediterranean, mainly due to the presence of symbiotic algae. However, a substantial shift in the conservation condition of the species has been observed in the recent years. The aim of this study is to evaluate the lethal and sublethal effects of recent MHWs on the populations of E. singularis. Our results show that recurrent MHWs have impacted both the demography and reproduction of the species between 2002 and 2020, driving mortalities up to 36%, an increase in the percentages of non-reproducing adult colonies (11–58%), and a significant decrease in the recruitment rates. Although E. singularis is a highly dynamic species in comparison with other temperate gorgonians, the present study suggests that the persistence of this species may be severely compromised under recurrent MHWs, at least at shallowest depths.

地中海藻类正受到经常性极端气候事件（如海洋热浪）的威胁。白海棠 Eunicella singularis 被认为是地中海西北部最具抵抗力的海棠物种，这主要是由于共生藻的存在。然而，近年来观察到该物种的保护状况发生了很大变化。本研究的目的是评估最近的 MHW 对奇异藻种群的致死和亚致死影响。我们的研究结果表明，2002年至2020年期间，反复发生的MHW对该物种的人口和繁殖都产生了影响，导致死亡率高达36%，无法繁殖的成虫群落比例增加（11-58%），招募率显著下降。虽然与其他温带海龙相比，奇异海龙（E. singularis）是一个极具活力的物种，但本研究表明，在经常性的 MHWs 下，该物种的持久性可能会受到严重影响，至少在最浅的深度是如此。

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引用次数: 0

Seasonal and long-term variations of nutrients in Liaodong Bay, China: Influencing factors and ecological effects 中国辽东湾营养盐的季节和长期变化：影响因素和生态效应

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-10-28 DOI: 10.1016/j.marenvres.2024.106815

Jinhao Wu , Zhaohui Wang , Jiashen Tian , Nan Li , Kun Wang , Lun Song , Guangjun Song , Xuemei Xu

Nutrients are essential for marine primary productivity and have a critical role in maintaining the structure and function of marginal. Variations in nutrient levels in sea ecosystems can influence ecological disturbances significantly. The Liaodong Bay (LDB) is a semi-enclosed marginal sea in northern China. It has experienced severe eutrophication since the 1990s, leading to considerable environmental challenges. Understanding of seasonal and long-term nutrient dynamics in the LDB is limited. We examined seasonal datasets collected in May (spring), August (summer), November (autumn), and March (winter) of 2019, and analyzed long-term trends through historical records spanning multiple decades. Nutrients accumulated during autumn/winter but were depleted during spring/summer. A low concentration of dissolved inorganic phosphate led to an increased nitrogen ratio exceeding the Redfield ratio (>16) during winter, spring, and summer, driven by phytoplankton growth. In late-autumn, nutrient concentrations increased, with ratios approaching the Redfield ratio. Phosphorus limitation prevailed in spring, summer, and winter, while silicon limitation dominated in autumn. Dissolved inorganic nitrogen and nitrogen ratios in the LDB increased sharply since the 1980s, peaking before declining after 2013. Dissolved silica and silicon ratios decreased steadily, stabilizing in recent years. These trends imply a shift from nitrogen-to-phosphorus limitation, influenced by riverine inputs and atmospheric deposition. These nutrient fluctuations may have significant ecological effects, including dinoflagellate abundance, algal blooms, and jellyfish blooms. Our analyses highlight the complexity of nutrient dynamics and positive impact of local nutrient-reduction policies implemented in recent years in improving the environmental quality of the LDB.

营养物质是海洋初级生产力所必需的，在维持边缘结构和功能方面起着至关重要的作用。海洋生态系统中营养物质水平的变化会对生态干扰产生重大影响。辽东湾（LDB）是中国北部的一个半封闭边缘海。自 20 世纪 90 年代以来，辽东湾经历了严重的富营养化，给环境带来了巨大挑战。对辽东湾季节性和长期营养盐动态的了解十分有限。我们研究了在 2019 年 5 月（春季）、8 月（夏季）、11 月（秋季）和 3 月（冬季）收集的季节性数据集，并通过跨越几十年的历史记录分析了长期趋势。营养物质在秋冬季积累，但在春夏季消耗殆尽。在浮游植物生长的推动下，冬季、春季和夏季溶解性无机磷酸盐浓度较低，导致氮比率增加，超过雷德菲尔德比率（>16）。深秋时节，营养物质浓度增加，比率接近雷德菲尔德比率。磷的限制在春季、夏季和冬季占主导地位，而硅的限制在秋季占主导地位。自 20 世纪 80 年代以来，LDB 中的溶解无机氮和氮比值急剧上升，在 2013 年之后达到顶峰，然后开始下降。溶解硅和硅比值持续下降，近年来趋于稳定。这些趋势意味着，受河流输入和大气沉降的影响，氮的限制已转变为磷的限制。这些营养物质的波动可能会对生态产生重大影响，包括甲藻丰度、藻类大量繁殖和水母大量繁殖。我们的分析凸显了养分动态的复杂性，以及近年来当地实施的减少养分政策对改善内陆DB环境质量的积极影响。

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引用次数: 0

Ecological interactions and unique resource partitioning between dolphins in the ultraoligotrophic eastern Mediterranean Sea 地中海东部超低营养盐海域海豚之间的生态互动和独特资源分配。

IF 3 3区环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES

Marine environmental research

Pub Date : 2024-10-28 DOI: 10.1016/j.marenvres.2024.106817

Zuriel E.Y , Martinez S , Shemesh E , Galili O , Tchernov D , Scheinin A.P , Kerem D

This study delves into the eco-dynamics of three dolphin species in the ultra-oligotrophic waters off the southern Israeli Mediterranean coast - two neritic: the common bottlenose dolphin (Tursiops truncatus) and the common dolphin (Delphinus delphis) and one pelagic: the striped dolphin (Stenella coeruleoalba). It utilizes compound-specific stable isotope analysis of individual amino acids to investigate carbon and nitrogen source variability and trophic positioning among the three species. Muscle samples from stranded individuals were analyzed for carbon (δ¹³C) and nitrogen (δ¹⁵N) isotopic ratios of amino acids, with Δδ¹⁵N (Glutamate-Phenylalanine) acting as an indicator of relative trophic position. The findings reveal minor differences in carbon source signatures and trophic position among species, but distinct nitrogen source signatures. The latter indicate discrete foraging habitats for bottlenose and striped dolphins and suggest that common dolphins transition between shallow benthic and deep pelagic feeding areas during the day and night, respectively, as part of their survival strategy.

本研究深入探讨了以色列南部地中海沿岸超低营养水域中三个海豚物种的生态动力学，其中两个是内栖海豚：普通瓶鼻海豚（Tursiops truncatus）和普通海豚（Delphinus delphis），一个是中上层海豚：条纹海豚（Stenella coeruleoalba）。它利用对单个氨基酸的特定化合物稳定同位素分析来研究碳源和氮源的变化以及这三个物种之间的营养定位。对搁浅个体的肌肉样本进行了氨基酸碳（δ13C）和氮（δ15N）同位素比值分析，其中δδ15N（谷氨酸-苯丙氨酸）是相对营养位置的指标。研究结果表明，不同物种之间的碳源特征和营养位置略有不同，但氮源特征却截然不同。后者表明瓶鼻海豚和条纹海豚有不同的觅食栖息地，并表明普通海豚在白天和夜间分别在浅海底和深海水层觅食区之间转换，这是它们生存策略的一部分。

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引用次数: 0