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Environmental and ecological factors associated with stinging jellyfish at a tourism hotspot in the Gulf of Thailand 泰国湾旅游热点地区与刺水母有关的环境和生态因素
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-18 DOI: 10.1016/j.ecss.2024.108992
Rahul Mehrotra , Pasicha Chaikaew , Elouise Haskin , Kirsty Magson , Chad M. Scott , Ruth Doherty
The waters of Thailand are associated with some of the most severe cases of envenomation from jellyfish in Asia, often attributed to the extensive marine recreational tourism industry it supports. The western Gulf of Thailand in particular has been shown to host among the highest abundances of box jellyfish, while also being home to some of the highest marine recreational tourism, such as along the Koh Samui archipelago. Here we utilise aspects of the same tourism industry to develop a deeper understanding of stinging jellyfish population dynamics, by combining citizen science at the island of Koh Tao, with dedicated in-situ surveys and remote sensing data. Our analyses of 170 box jellyfish sightings and 81 blooms of Pelagia sp. across a six-year period revealed a strong seasonal trend, with both groups being most abundant between July and December. Decision tree analysis of the complete observation dataset and multiple environmental variables revealed a combination of precipitation and lunar cycle to be the strongest predictors of the assessed stinging jellyfish at Koh Tao. Furthermore, blooms of Pelagia sp. were associated with extensive medusivory by a large diversity of predators, including reef building corals. These observations add to the growing literature showing that scleractinian corals are readily able to ingest larger prey items, either by solitary or protocooperative feeding strategies. Meanwhile, no consumption of box jellyfish medusae was recorded during the study. These findings may allow for improved tourism management practices while also supporting a wider biogeographic assessment of stinging jellyfish in south-east Asia.
在亚洲,泰国水域与一些最严重的水母中毒病例有关,这通常归因于其所支持的广泛的海洋休闲旅游业。泰国西部海湾是箱水母数量最多的地区之一,同时也是苏梅岛等海洋休闲旅游业最发达的地区。在这里,我们将涛岛的公民科学与专门的现场调查和遥感数据相结合,利用同一旅游业的各个方面来深入了解刺水母的种群动态。我们对 6 年间观察到的 170 个箱形水母和 81 个海鳗绽放点进行了分析,结果显示出强烈的季节性趋势,7 月至 12 月期间这两类水母的数量最多。对完整观测数据集和多个环境变量进行决策树分析后发现,降水量和农历周期是预测涛岛刺水母评估结果的最有力因素。此外,Pelagia sp.的大量繁殖还与包括造礁珊瑚在内的多种食肉动物的广泛介食有关。越来越多的文献表明,硬骨鱼类珊瑚能够通过单独或原生合作的摄食策略摄取较大的猎物。同时,在研究过程中没有记录到食用箱水母的情况。这些发现可能有助于改进旅游管理方法,同时也支持对东南亚刺水母进行更广泛的生物地理评估。
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引用次数: 0
Variability and composition of mysid assemblages in a northwest Iberian estuary: Insights from a 10-year data series 伊比利亚西北部河口糠虾群的变化和组成:从 10 年数据系列中获得的启示
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-18 DOI: 10.1016/j.ecss.2024.108991
Ana Filipa Oliveira , Marta Monteiro , Joana Pereira , Ulisses M. Azeiteiro , Filipe Martinho , Miguel Ângelo Pardal , Sónia Cotrim Marques
Long-term temporal studies have been used to assess the effects of climate change on mysid populations and their complex ecological interplay within heterogeneous ecosystems. This study is the first to investigate the mysid community in the Mondego estuary, western Portugal, for a decade, from 2003 to 2012. Monthly data collected from five stations along the estuary was used to investigate variations in mysid assemblage composition, patterns, phenology, and the interactions with environmental variables. Thirteen taxa were found in the assemblages. The community was dominated by Mesopodopsis slabberi, which was found in great numbers in the upper estuarine region. Praunus flexuosus and Schistomysis spiritus dominated the assemblages in the middle estuary, while Gastrossacus spinifer and Heteromysis formosa were very abundant at the mouth of the estuary. Overall, mysids were mostly present during autumn periods, when local environmental factors such as water temperature and chlorophyll-a concentrations influenced assemblage abundances. The high productivity of the system played a pivotal role in fostering greater species abundance. However, lower abundances were detected during warmer years, further evidencing changes in these key species’ communities under future climatic scenarios of increasing water temperatures.
长期的时间研究被用来评估气候变化对糠虾种群的影响以及它们在异质生态系统中复杂的生态相互作用。本研究首次对葡萄牙西部蒙德戈河口的糠虾群落进行了调查,时间跨度为 2003 年至 2012 年的十年。从河口沿岸五个站点收集的月度数据用于研究糠虾群落的组成、模式、物候变化以及与环境变量的相互作用。在组合中发现了 13 个分类群。该群落以 Mesopodopsis slabberi 为主,在河口上游地区发现了大量的 Mesopodopsis slabberi。Praunus flexuosus 和 Schistomysis spiritus 在河口中部的组合中占主导地位,而 Gastrossacus spinifer 和 Heteromysis formosa 则在河口非常丰富。总体而言,糠虾主要出现在秋季,当地的环境因素(如水温和叶绿素-a 浓度)影响了它们的数量。该系统的高生产力对提高物种丰度起到了关键作用。然而,在温度较高的年份,物种丰度较低,这进一步证明了在未来水温升高的气候情景下,这些关键物种群落的变化。
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引用次数: 0
Variation in lifetime movements of an Ariidae species in an eastern Australian river revealed by otolith microchemistry 通过耳石微化学揭示澳大利亚东部河流中一种箭鱼科鱼类一生中的活动变化
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-16 DOI: 10.1016/j.ecss.2024.108990
Lauren J. Stoot , Gregory S. Doran , Jason D. Thiem , Gavin L. Butler , An V. Vu , Lee J. Baumgartner
Ariids, or sea catfishes, inhabit marine, estuarine, and occasionally freshwater habitats circumtropically. They are most often locally abundant and are important in artisanal and commercial fisheries, particularly in developing countries. Detailed information on the ecology and habitat preferences of many of the genera within the family is lacking. We analysed the otolith of 57 blue catfish, Neoarius graeffei, collected from the lower reaches of the Clarence River, NSW, Australia with the aim of better understanding the species movement ecology, including its ability to respond to environmental change. Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) was used to quantify Sr:Ca, Ba:Ca and 87Sr:86Sr ratios in otoliths and infer lifetime movement patterns. Otolith microchemistry revealed inter-individual variation in the movement patterns of N. graeffei. A strong affinity for estuarine waters was evident among most individuals, with movement into upstream freshwater habitats for extended periods discernible in some individuals. Variation in movement patterns was identified by changes in Ba:Ca, Sr:Ca and 87Sr:86Sr otolith profiles, although Sr:Ca lacked clear patterns. Furthermore, both Ba:Ca and 87Sr:86Sr otolith transects revealed estuarine residence by juveniles, as well as multiple movements among chemically distinct areas throughout the lifetime of some individuals. Otolith microchemistry enabled elucidation of long-term movement patterns of N. graeffei in our study. Uncovering the variable movement patterns of a single species identifies the potential adaptable nature of other species within the Ariidae family and indicates N. graeffei is resilient to environmental changes and anthropogenic impacts.
鲶鱼又称海鲇,栖息于海洋、河口,偶尔也栖息于淡水生境。它们通常在当地资源丰富,在个体渔业和商业渔业中非常重要,尤其是在发展中国家。关于该科许多属的生态学和栖息地偏好的详细信息尚缺。我们分析了从澳大利亚新南威尔士州克拉伦斯河下游采集的 57 条蓝鲶(Neoarius graeffei)的耳石,目的是更好地了解该物种的运动生态,包括其应对环境变化的能力。利用激光烧蚀电感耦合等离子体质谱法(LA-ICP-MS)对耳石中的Sr:Ca、Ba:Ca和87Sr:86Sr比率进行量化,并推断其一生的移动模式。耳石微化学分析揭示了 N. graeffei 运动模式的个体间差异。大多数个体对河口水域的亲和力很强,但也有一些个体长期在上游淡水生境中活动。通过Ba:Ca、Sr:Ca和87Sr:86Sr耳石剖面图的变化可确定其运动模式的变化,但Sr:Ca缺乏明确的模式。此外,Ba:Ca 和 87Sr:86Sr 耳石横断面均显示幼体在河口居住,以及一些个体在一生中多次在化学性质不同的区域之间移动。在我们的研究中,耳石微化学研究有助于阐明 N. graeffei 的长期运动模式。揭示单一物种的多变运动模式,可以发现鮨科其他物种的潜在适应性,并表明鮨鱼对环境变化和人为影响具有很强的适应能力。
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引用次数: 0
Association between water darkening and hypoxia in a Norwegian fjord 挪威峡湾海水变暗与缺氧之间的关系
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-16 DOI: 10.1016/j.ecss.2024.108988
Martine Røysted Solås , Anne Gro Vea Salvanes , Dag L. Aksnes
Previous studies have shown that climate change makes Norwegian fjords prone to deoxygenation and water darkening (reduced light penetration) with ecological implications across the food web from phytoplankton to fish. While deoxygenation occurs in deep fjord basins due to reduced water renewal, water darkening has primarily been linked to increased loads of colored dissolved organic matter (CDOM) of terrestrial origin in rivers draining to the Baltic Sea, the North Sea and ultimately to the Norwegian Coastal Current and associated coastal waters. Here, we investigate the hypothesis that water darkening is also linked to deoxygenation of fjord basins. We measure the downwelling irradiance in a water column with hypoxic and anoxic water and compare it with a nearby, well-oxygenated water column. Our data show increased darkening in the hypoxic and anoxic layers, likely due to elevated concentrations of CDOM that is produced locally in these layers. We discuss the ecological implication of this result, which we believe is particularly relevant for the mesopelagic habitat.
以往的研究表明,气候变化使挪威峡湾容易出现脱氧和水体变暗(光线穿透力降低)现象,对从浮游植物到鱼类的整个食物网产生生态影响。深峡湾盆地因水体更新减少而出现脱氧现象,而水体变暗则主要与流入波罗的海、北海并最终流入挪威沿岸流和相关沿岸水域的河流中陆源彩色溶解有机物(CDOM)负荷增加有关。在这里,我们研究了水体变黑也与峡湾盆地脱氧有关的假设。我们测量了缺氧和缺氧水体中的下沉辐照度,并与附近的富氧水体进行了比较。我们的数据显示,缺氧和缺氧层中的暗度增加,这可能是由于这些层中局部产生的 CDOM 浓度升高所致。我们讨论了这一结果的生态意义,认为它与中层栖息地特别相关。
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引用次数: 0
Mapping South Africa's canopy-forming kelp forests using low-cost, high-resolution Sentinel-2 imagery 利用低成本、高分辨率的 "哨兵-2 "号卫星图像绘制南非形成冠层的海藻林地图
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-15 DOI: 10.1016/j.ecss.2024.108989
Loyiso Dunga , Melanie Lück-Vogel , Laura K. Blamey , John Bolton , Mark Rothman , Phil Desmet , Kerry Sink
Globally, kelp forests play a vital role in providing ecological, social and economic services. They contribute to the livelihoods and resilience of many coastal communities. To date, a gap exists in contemporary, comprehensive and consistent maps of South African kelp forests, since they were last mapped partially in 2006 by covering 900 km of South Africa's coastline. This study addresses this gap by producing a comprehensive remotely sensed high-resolution 2016 map of canopy forming coastal kelp forests. Using the 10m resolution Sentinel-2 A and B spectral bands 4 (RED) and 8 (NIR), an expert derived Normalized Difference Vegetation Index (NDVI) threshold was used to detect surface protruding kelp forests along 1300 km coastline. The results were validated with expert verification and using Google Earth, data from historic maps, remote sensing and biomass estimation of South African kelp resources. Our study demonstrates the aptitude of Sentinel-2 for detecting canopy-forming kelps at low cost along South Africa's west and south coast. We report the encountered drawbacks in mapping an expansive coastline with varied sea conditions including wave activity, tides and turbidity. Comprehensive ground validation, long-term monitoring sites and the use of time series datasets remain a gap towards improving the calibration of remote sensing methods and long-term monitoring of South African kelp forests. Our results provide a foundation for continuous monitoring of South African kelp forests as well as exploring other unmapped kelp/similar habitats to inform research and environmental management.
在全球范围内,海藻林在提供生态、社会和经济服务方面发挥着至关重要的作用。它们为许多沿海社区的生计和恢复能力做出了贡献。迄今为止,南非海藻林的当代、全面和一致的地图还存在空白,因为上一次绘制南非海藻林的部分地图是在 2006 年,覆盖了南非 900 公里的海岸线。本研究针对这一空白,绘制了一幅全面的遥感高分辨率 2016 年沿海海藻林冠层地图。利用 10 米分辨率的哨兵-2 A 波段和 B 波段 4(红光)和 8(近红外),使用专家得出的归一化差异植被指数(NDVI)阈值来检测 1300 公里海岸线上的地表突出海藻林。专家通过谷歌地球、历史地图数据、南非海藻资源遥感和生物量估算对结果进行了验证。我们的研究表明,哨兵-2 能够以较低的成本探测南非西海岸和南海岸的冠状海带。我们报告了在绘制波浪活动、潮汐和浊度等不同海况的广阔海岸线地图时遇到的缺点。在改进遥感方法的校准和南非海藻森林的长期监测方面,全面的地面验证、长期监测点和时间序列数据集的使用仍然存在差距。我们的研究成果为持续监测南非海藻林以及探索其他未绘制地图的海藻/类似栖息地奠定了基础,为研究和环境管理提供了信息。
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引用次数: 0
Intertidal crab prey pulse export quantifies the importance of tidal wetland connectivity 潮间带蟹类猎物脉冲输出量化了潮汐湿地连通性的重要性
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-15 DOI: 10.1016/j.ecss.2024.108986
Cécile Vulliet , Jack Koci , Marcus Sheaves , Nathan Waltham
A key value of saltmarshes is their role in providing trophic subsidies, notably in the form of prey pulses of crab zoeae (CZ). No studies to date, however, have investigated quantitatively the patterns between crab zoeae pulses and saltmarsh tidal connectivity in tropical estuaries. In this study, CZ densities were examined over successive tides and months using a zooplankton sampling pump to examine links between tidal fluctuations and pulses of CZ in a tropical Australian estuary with a complex of tidal saltmarshes, mangroves, and unvegetated flats. CZ densities were linked to spatially explicit information on tidal wetland inundation that was derived from Unattended-Aerial-Vehicle (UAV) Structure from motion (SfM) photogrammetry and two-dimensional hydrodynamic modelling. The study found that: (1) tidal connectivity is a key trigger to prey pulse export; (2) while tidal connectivity was critical in the export of CZ, not all tidal connections resulted in meaningful ecological connectivity; and (3) succulent saltmarsh was one of the tidal wetland types contributing to the export of CZ. Surprisingly, we reveal that not all succulent saltmarshes were uniformly participating in CZ export. These findings highlight the significance of quantitative eco-hydrological approaches to assess saltmarsh and tidal connectivity values. This study supports the need for management and restoration approaches to integrate a contextual understanding of the synergies between hydrology, ecology, and habitat heterogeneity. These data emphasise the need to move beyond generalisations that “similar” habitat type share similar ecological functions and should be managed equally.
盐沼的一个重要价值是其在提供营养补助方面的作用,特别是以蟹类藻类(CZ)猎物脉冲的形式提供营养补助。然而,迄今为止,还没有任何研究对热带河口的蟹藻脉冲与盐沼潮汐连通性之间的模式进行定量研究。在这项研究中,使用浮游动物采样泵对连续潮汐和月份中的 CZ 密度进行了检测,以研究澳大利亚一个由潮汐盐沼、红树林和无植被滩涂组成的热带河口中潮汐波动与 CZ 脉冲之间的联系。CZ 密度与潮汐湿地淹没的空间信息相关联,潮汐湿地淹没的空间信息来自无人飞行器(UAV)的运动结构(SfM)摄影测量和二维水动力模型。研究发现(1) 潮汐连通性是猎物脉冲输出的关键触发因素;(2) 虽然潮汐连通性对 CZ 的输出至关重要,但并非所有潮汐连通性都能带来有意义的生态连通性;(3) 肉质盐沼是促进 CZ 输出的潮汐湿地类型之一。令人惊讶的是,我们发现并非所有肉质盐沼都一致参与了 CZ 的输出。这些发现凸显了采用定量生态水文方法评估盐沼和潮汐连通性价值的重要性。这项研究证明,管理和恢复方法需要结合对水文、生态和生境异质性之间协同作用的理解。这些数据强调,不能一概而论地认为 "相似 "的生境类型具有相似的生态功能,应该同等管理。
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引用次数: 0
Survival strategies of Bar-tailed Godwit in tropical sand beaches: Straight-line and zigzag foraging techniques 条尾鸻在热带沙滩的生存策略:直线和之字形觅食技术
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-15 DOI: 10.1016/j.ecss.2024.108985
T.R. Athira , Aymen Nefla , K.A. Rubeena , Sabir Bin Muzaffar , Omer R. Reshi , T. Jobiraj , P. Thejass , K.M. Aarif
The near-threatened Bar-tailed Godwit (Limosa lapponica) makes the longest non-stop endurance flights among shorebirds. They are regular winter visitors to the Kadalundi-Vallikkunnu Community Reserve and adjoining sand beaches along the west coast of India. The research investigates their foraging strategies within sand beaches, observed over six years (2016–2022). Extensive field observations across major sand beaches documented two distinct modes of continuous stitching behaviour; a straight-line mode and a zigzag mode. Despite predation pressure and human disturbances, Bar-tailed Godwits achieved high prey capture rates, likely due to the abundance of benthic invertebrates. The study also revealed the prevalence of this behaviour and its association with rate of prey consumption, particularly focusing on the availability of Cosmonotus crabs, the dominant prey species. The zigzag pattern, was associated with higher prey capture rates, suggesting an adaptive response to prey distribution. Our findings suggest that, this unique foraging strategy allows Bar-tailed Godwits to optimize prey capture while conserving time and energy, especially in resource-scarce environments. Furthermore, the implications of these behaviours are discussed in the context of prey availability, nutrient content, and the energetic demands of long-distance migration, shedding light on to the adaptive mechanisms employed by shorebirds in challenging habitats.
濒临灭绝的条尾神鸟(Limosa lapponica)是岸鸟中不间断飞行时间最长的鸟类。它们是印度西海岸卡达伦迪-瓦利库努社区保护区和毗邻沙滩的冬季常客。这项研究调查了它们在沙滩上的觅食策略,观察时间长达六年(2016-2022 年)。对主要沙滩的广泛实地观察记录了两种不同的连续缝合行为模式:直线模式和之字形模式。尽管存在捕食压力和人为干扰,条尾鲣鸟仍能实现较高的猎物捕获率,这可能与丰富的底栖无脊椎动物有关。研究还揭示了这种行为的普遍性及其与猎物消耗率的关系,特别是与主要猎物物种螃蟹(Cosmonotus crabs)的可获得性有关。之字形模式与较高的猎物捕获率有关,表明这是一种对猎物分布的适应性反应。我们的研究结果表明,这种独特的觅食策略可以让条尾鲣鸟在节省时间和能量的同时优化猎物捕获,尤其是在资源稀缺的环境中。此外,我们还结合猎物的可获得性、营养成分和长途迁徙的能量需求,讨论了这些行为的影响,从而揭示了岸鸟在具有挑战性的栖息地所采用的适应机制。
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引用次数: 0
Integrating physical and biogeochemical processes and oceanic exchanges at a coastal lagoon in Southern West Europe 西欧南部沿海泻湖的物理和生物地球化学过程与海洋交换的整合
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-15 DOI: 10.1016/j.ecss.2024.108987
Alexandra Cravo, José Jacob, Alexandra Rosa , Cátia Correia
Coastal lagoons are highly productive systems and the quantification of mass fluxes, which is of paramount importance for the sustainable management of these systems, remains poorly studied. In this context, a detailed study was conducted to better understand the exchanges between the productive coastal lagoon Ria Formosa (South-West Europe) and the ocean. The exchanges of water, nutrients, chlorophyll-a and suspended solids between the main inlets (Faro-Olhão inlet - BFO; Armona inlet - BAR; and Ancão inlet - BAN) and adjacent channels (Faro - CF and Olhão - CO) and the adjacent ocean were estimated along complete semidiurnal tidal cycles, under extreme fortnightly tidal ranges and different seasonal and environmental/oceanographic conditions. The net tidal prism was highest during spring tides. Among the three inlets, BFO was the most important in terms of exchange, followed by BAR and BAN. Net transport at BFO was lowest during the Summer campaign, although it exported material that fertilised the adjacent coast. The persistent net export of suspended solids and ammonium suggests the higher biological productivity of Ria Formosa compared to that found in coastal waters. In the Winter campaign, after a period of rainfall and increased land runoff, there was a remarkable export of matter, on which, ammonium and suspended particles exported can exceed 0.3 times and almost 0.9 times, respectively, those imported from coastal water. However, the import of phosphate and nitrate can be attributed to a weak coastal upwelling event, as well to low consumption and nitrification at this period of low temperature. During the Spring and Autumn campaigns, the Ria Formosa was fertilised either by upwelling events or due to rapid consumption of nutrients by phytoplankton in this shallow system. BFO and the other two inlets of the western sector of Ria Formosa are interconnected by CF and CO. The higher nutrient transport was recorded at CF, despite the highest nutrients concentrations was recorded at CO. The data show the strong link between physical and biogeochemical processes with meteorological/oceanographic factors. The study showed that associated biological processes are superimposed on the tidal effect in this system. Data from this study could be used as a reference, particularly important for management of Ria Formosa, a productive system where bivalves production depends deeply on water quality. In addition, the nutrient concentrations and mass exchanges resulting from the different processes can be used as a reference for other lagoon systems where shellfish production is practised.
沿海泻湖是高产系统,而质量通量的量化对这些系统的可持续管理至关重要,但这方面的研究仍然很少。为此,我们进行了一项详细研究,以更好地了解富饶的沿海泻湖 Ria Formosa(欧洲西南部)与海洋之间的交换情况。在每两周一次的极端潮差以及不同的季节和环境/海洋条件下,对主要入海口(法罗-奥尔 良入海口-BFO;阿尔莫纳入海口-BAR;安康入海口-BAN)和邻近水道(法罗-CF 和奥尔 良-CO)与邻近海洋之间的水、营养物、叶绿素-a 和悬浮固体的交换进行了估算。净潮汐棱镜在春潮期间最大。在三个入海口中,BFO 的交换量最大,其次是 BAR 和 BAN。在夏季活动期间,BFO 的净输送量最低,尽管它输出的物质为邻近海岸提供了肥料。悬浮固体和铵的持续净输出表明,与沿岸水域相比,福尔摩沙河的生物生产力较高。在冬季活动中,经过一段时间的降雨和陆地径流的增加,物质输出量显著增加,其中氨和悬浮颗粒的输出量可分别超过从沿岸水域输入量的 0.3 倍和近 0.9 倍。然而,磷酸盐和硝酸盐的输入可归因于微弱的沿岸上升流活动,以及低温时期的低消耗和硝化作用。在春季和秋季活动期间,福莫萨湾因上升流活动或该浅水系统中浮游植物快速消耗养分而肥沃起来。BFO 和福尔摩沙岛西区的其他两个入海口通过 CF 和 CO 相互连接。尽管 CO 处的营养物浓度最高,但 CF 处的营养物迁移量更大。这些数据表明,物理和生物地球化学过程与气象/海洋因素密切相关。研究表明,在该系统中,相关的生物过程与潮汐效应叠加在一起。这项研究的数据可作为参考,对福尔摩沙河的管理尤为重要,因为福尔摩沙河是一个富饶的系统,双壳贝类的产量在很大程度上取决于水质。此外,不同过程产生的营养物浓度和质量交换也可作为其他生产贝类的环礁湖系统的参考。
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引用次数: 0
Impacts of anthropogenic resuspension on sediment organic matter: An experimental approach 人为重悬浮对沉积物有机质的影响:实验方法
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-11 DOI: 10.1016/j.ecss.2024.108981
Christian Lønborg , Stiig Markager , Simon David Herzog , Catia Carreira , Signe Høgslund
Globally coastal sediments are frequently disturbed by a wide range of physical anthropogenic processes (e.g. bottom trawling) which causes resuspension of sediment organic matter (OM) into the overlaying water column. In this study we present experimental results showing that anthropogenic sediment resuspension decreases the organic carbon (14x) and nitrogen (3x) content in the sediment material resuspended to the water column, while no measurable response was found for organic phosphorus. Our findings furthermore show that the OM bioavailability decreased and the Carbon:Nitrogen:Phosphorus stoichiometry was changed suggesting that anthropogenic resuspension changes the chemical composition, and/or production and degradation pathways of the OM pool. The detected changes in OM biogeochemistry could affect nutrient release, fuel oxygen consumption and at the same time increase CO2 production in coastal waters.
全球沿海沉积物经常受到各种物理人为过程(如底拖网捕捞)的扰动,导致沉积物 有机物(OM)重新悬浮到上覆水体中。在这项研究中,我们的实验结果表明,人为的沉积物再悬浮会使再悬浮到水体中的沉积物中的有机碳(14 倍)和氮(3 倍)含量降低,而对有机磷则没有发现可测量的反应。我们的研究结果还表明,有机物的生物利用率降低,碳:氮:磷的化学计量发生了变化,这表明人为的再悬浮改变了有机物池的化学组成和/或生成和降解途径。检测到的 OM 生物地球化学变化可能会影响沿岸水域的营养物质释放、氧气消耗,同时增加二氧化碳的产生。
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引用次数: 0
Benthic food web structure of a highly stratified sub-Arctic archipelago on the Newfoundland Shelf (Northwest Atlantic Ocean) 纽芬兰大陆架(西北大西洋)高度分层的亚北极群岛底栖食物网结构
IF 2.6 3区 地球科学 Q1 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-10-11 DOI: 10.1016/j.ecss.2024.108982
Guillaume Bridier , Frédéric Olivier , Laurent Chauvaud , Vincent Le Garrec , Gabin Droual , Jacques Grall
Arctic and sub-Arctic marine ecosystems are experiencing some of the highest sea surface warming in the world, which has intensified water column stratification and subsequently reduced phytoplankton production and particulate organic matter quality. However, the effects of these changes on benthic food webs and the transfer of organic matter to higher trophic levels are still poorly understood. This study examines the spatial and temporal variability of food web structure in a sub-Arctic benthic community exposed to contrasting thermal stratification conditions. The study hypothesizes that during stratified periods, oceanographic conditions would have a limited effect on benthic invertebrates located above/at the thermocline due to their direct access to surface/subsurface primary production. On the other hand, organisms below the thermocline may be more sensitive to increased stratification because they do not have direct access to these food resources. To test this hypothesis, we sampled benthic invertebrates and several fish species on the Newfoundland Shelf along a cross-shore transect (2 shallow stations versus 2 deep stations above and below the thermocline, respectively) over two seasons. We used isotopic analyses (δ13C and δ15N) to study the structure of the food web and the transfer of organic matter. No temporal variation and little spatial variability in food web structure was observed, resulting in a 73.2% overlap between isotopic niches of shallow and deep stations. At all stations, most primary consumers were characterized by high trophic plasticity, feeding on both phytoplankton and benthic organic matter (mean dependence on benthic sources = 46.7%). In the context of global warming and increased thermal stratification, we hypothesize that benthic primary production may be less vulnerable to nutrient depletion than phytoplankton. We suggest that an increased contribution of benthic primary producers to organic matter fluxes in shallow coastal food webs could significantly enhance the resilience of the benthic food web to stratification intensification.
北极和亚北极海洋生态系统正经历着世界上最高的海面升温,这加剧了水柱分层,随之降低了浮游植物产量和颗粒有机物质量。然而,人们对这些变化对底栖生物食物网以及有机物向更高营养级转移的影响还知之甚少。本研究考察了暴露在不同热分层条件下的亚北极底栖生物群落食物网结构的时空变异性。研究假设,在分层期间,海洋条件对位于热层线以上/热层线以下的底栖无脊椎动物的影响有限,因为它们可以直接获得表层/次表层初级生产。另一方面,温跃层以下的生物可能对分层加剧更为敏感,因为它们无法直接获得这些食物资源。为了验证这一假设,我们在纽芬兰大陆架沿跨岸横断面(热层线以上和热层线以下分别为 2 个浅水站和 2 个深水站)进行了两个季节的底栖无脊椎动物和多种鱼类采样。我们利用同位素分析(δ13C 和 δ15N)来研究食物网的结构和有机物的转移。食物网结构没有时间变化,空间变化也很小,因此浅层和深层站位的同位素位点重叠率为 73.2%。在所有观测站,大多数初级消费者都具有高度营养可塑性的特点,既以浮游植物为食,也以底栖生物有机物为食(对底栖生物来源的平均依赖度=46.7%)。在全球变暖和热分层加剧的背景下,我们假设底栖初级生产可能比浮游植物更不容易受到营养枯竭的影响。我们认为,增加底栖初级生产者对浅海沿岸食物网中有机物质通量的贡献,可大大提高底栖食物网对分层加剧的适应能力。
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引用次数: 0
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Estuarine Coastal and Shelf Science
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