Deep-sea Research Part Ii-topical Studies in Oceanography最新文献_第4页

Implications of gear selection for monitoring benthic fish communities in the Beaufort Sea 波弗特海底栖鱼类群落监测的渔具选择意义

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-11-06 DOI: 10.1016/j.dsr2.2025.105561

Duane E. Stevenson , Stan Kotwicki , Brenda Norcross , Andrew Majewski

A series of bottom-trawl surveys were conducted in the Beaufort Sea in the years 2012–2014 to compare catch characteristics among gear types using paired research trawls. In the western Beaufort Sea, an American team compared two types of benthic beam trawls, while in the eastern Beaufort Sea, a Canadian team compared a benthic beam trawl with a larger Otter trawl. These surveys documented a relatively low-diversity community of primarily benthic and demersal fishes, which consisted of primarily small (<20 cm TL) individuals. Catch biomass in the eastern Beaufort Sea was dominated by Arctic cod, while in the western Beaufort Sea the biomass was more evenly distributed among Arctic cod, skates, eelpouts, and other species. Large gadids (>20 cm TL) were notably absent from all catches. Size selectivity among the two benthic beam trawls in the western Beaufort Sea was similar. However, the plumb-staff beam trawl captured a higher proportion of the smallest specimens and had a higher probability of detection than the high-rise benthic beam trawl throughout the size range of fish specimens encountered. Selectivity differences between the beam trawl and Otter trawl in the eastern Beaufort Sea were more pronounced, as the benthic beam trawl captured a greater proportion of smaller fishes, but the Otter trawl captured a much higher proportion of larger fishes. Probability of detection was notably higher for the Otter trawl throughout the size range. These results confirm that estimates of diversity, biomass, and size distribution produced from trawl surveys are highly dependent on gear type.

2012-2014年，在波弗特海进行了一系列底拖网调查，使用配对研究拖网来比较不同渔具类型的捕获特性。在波弗特海西部，一个美国团队比较了两种底生物束拖网，而在波弗特海东部，一个加拿大团队比较了底生物束拖网和更大的水獭拖网。这些调查记录了一个相对低多样性的主要底栖和底栖鱼类群落，主要由小型（< 20cm TL）个体组成。东波弗特海的渔获生物量以北极鳕鱼为主，西波弗特海的渔获生物量以北极鳕鱼、冰鱼、鳗鱼等物种分布较为均匀。在所有捕获物中明显没有大的小穗状花序（> 20cm TL）。波弗特海西部两种底栖梁拖网的尺寸选择性相似。然而，在遇到的所有鱼类标本的大小范围内，铅杆梁拖网捕获的最小标本比例高于高层底栖梁拖网，并且具有更高的检测概率。在东波弗特海，梁拖网和水獭拖网的选择性差异更为明显，底底生物拖网捕获的小鱼比例更高，而水獭拖网捕获的大鱼比例更高。在整个大小范围内，水獭拖网的探测概率明显更高。这些结果证实，从拖网调查中得出的多样性、生物量和大小分布的估计高度依赖于渔具类型。

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引用次数: 0

Decomposition of marine copepod carcasses potentially contributes to the presence of denitrification genes in oxygen-depleted waters 海洋桡足动物尸体的分解可能有助于缺氧水域中反硝化基因的存在

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-11-02 DOI: 10.1016/j.dsr2.2025.105559

Sonia Yáñez , Pamela Hidalgo , Nicole Trefault , Kam W. Tang , Rodrigo De la Iglesia

Mesozooplankton can suffer a high degree of non-predatory mortality within the Oxygen Minimum Zone (OMZ), resulting in a high abundance of carcasses. Copepod carcasses are subject to bacterial decomposition with unclear consequences for nitrogen cycling, microbial biodiversity, and ecosystem functioning. We investigated the bacterial decomposition of carcasses of the copepod Acartia tonsa from Mejillones Bay within the Humboldt Current System under different dissolved oxygen concentrations. Using molecular methods, we followed the dynamics of bacterial composition and functional marker genes for nitrogen cycling. Decomposition of carcass tissues was observed earlier under oxic conditions than under Microxic/Suboxic conditions. Aerobic bacteria colonized the carcasses, and the associated functional gene for ammonia oxidation (amoA) was detected. Under Microxic/Suboxic conditions, decomposition was dominated by anaerobic bacteria and the related denitrification functional genes, specifically nitrite reductases (nirK) and of nitrous oxide reduction (nosZ), consistent with an estimated high denitrification rate. Based on these microscale observations, our study suggested that copepod carcasses were anaerobic microenvironments that potentially supported denitrification activity in the upper and lower oxyclines. Carcass driven denitrification may be an important loss of fixed N in the OMZ.

在氧气最低区（OMZ）内，中浮游动物可能遭受高度的非掠食性死亡率，导致大量的尸体。桡足动物的尸体会被细菌分解，对氮循环、微生物多样性和生态系统功能的影响尚不清楚。研究了洪堡洋流系统中Mejillones湾桡足动物Acartia tonsa尸体在不同溶解氧浓度下的细菌分解。利用分子方法，我们跟踪了细菌组成和氮循环功能标记基因的动态变化。在缺氧条件下，胴体组织的分解比在低氧/缺氧条件下更早。需氧细菌定植在尸体上，并检测到氨氧化相关功能基因（amoA）。在微氧/亚氧条件下，分解主要由厌氧细菌和相关的反硝化功能基因主导，特别是亚硝酸盐还原酶（nirK）和氧化亚氮还原酶（nosZ），这与估计的高反硝化率一致。基于这些微观尺度的观察，我们的研究表明，桡足动物的尸体是厌氧微环境，可能支持上下氧合酶的反硝化活动。胴体驱动的反硝化作用可能是OMZ中固定氮的重要损失。

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引用次数: 0

Megafaunal community structure on ferromanganese and phosphorite hardgrounds in the Southern California Borderland 南加州边境地区锰铁和磷矿硬地上的巨型动物群落结构

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-11-01 DOI: 10.1016/j.dsr2.2025.105560

Devin S. Vlach , Olívia S. Pereira , Francis Nguyen , Angelica Bradley , Kira Mizell , Lisa A. Levin

The Southern California Borderland (SCB) is a topographically complex region on the active continental margin that hosts varied hardground habitats, including ferromanganese (FeMn) crusts and phosphorites, marine minerals being considered for resource extraction. The SCB is influenced by seasonal upwelling and terrestrial inputs, and has a well-defined oxygen-minimum zone (OMZ). We analyzed megafaunal community composition, density, and diversity across 41 ROV video transects at 10 SCB hard substrate sites spanning depth (378–2765 m), temperature (1.79–7.96 °C), and oxygen (3.91–105.67 μM) gradients, with varying rock types (FeMn crusts, phosphorites, other rocks). We counted 32,426 individuals representing 146 unique taxa over a total area of 21,935 m². Echinodermata contributed 48 % of the total abundance; Cnidaria 24 %; Porifera 13 %; Annelida 6 %; Arthropoda 6 %; Chordata 2 %; Mollusca, Foraminifera, and Hemichordata <1 %. Megafauna communities showed clear heterogeneity, with density, diversity, and community composition varying among transects within sites and across sites. Rock type recorded no influence on megafaunal density, but habitats that included FeMn crusts had higher diversity and distinct taxonomic composition. Location, depth, and oxygen were the most important variables explaining variance among megafaunal communities, with distinct communities formed at deeper depths and within the OMZ. This study provides baseline information about the megafauna inhabiting SCB hardgrounds, particularly those associated with minerals considered for their resource potential. It extends existing documentation of such communities to greater depths, reveals increased representation of sponges and corals below 1000 m, and highlights the variability within and among deep-sea megafaunal communities, offering context for informed policy decisions.

南加州边地（SCB）是一个地形复杂的地区，位于活跃的大陆边缘，拥有各种硬地栖息地，包括锰铁（FeMn）地壳和磷矿，以及正在考虑进行资源开采的海洋矿物。SCB受季节性上升流和陆源输入的影响，具有明确的最小氧区（OMZ）。我们分析了10个SCB硬基质站点的41个ROV视频样带的巨型动物群落组成、密度和多样性，这些站点跨越深度（378-2765 m）、温度（1.79-7.96°C）和氧气（3.91-105.67 μM）梯度，具有不同的岩石类型（FeMn地壳、磷岩和其他岩石）。在21,935 m2的总面积上，共有146个独特的分类群，32,426个个体。棘皮类占总丰度的48%；刺胞菌24%；Porifera 13%；环节动物6%；节肢动物6%；脊索类2%；软体动物、有孔虫和半孔虫<； 1%。巨型动物群落表现出明显的异质性，在样点内和样点间存在密度、多样性和群落组成差异。岩石类型对巨型动物密度没有影响，但包含FeMn地壳的栖息地具有更高的多样性和明显的分类组成。位置、深度和氧气是解释巨型动物群落差异的最重要变量，在更深的深度和OMZ内形成了不同的群落。这项研究提供了栖息在SCB硬地的巨型动物的基线信息，特别是那些与被认为具有资源潜力的矿物有关的动物。它将这些群落的现有文献扩展到更深的深度，揭示了1000米以下海绵和珊瑚的代表性增加，并突出了深海巨型动物群落内部和之间的可变性，为知情的政策决策提供了背景。

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引用次数: 0

Mesoscale processes in the northern Arabian Sea: Linking in situ observations to remote-sensing 阿拉伯海北部的中尺度过程：将现场观测与遥感联系起来

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-30 DOI: 10.1016/j.dsr2.2025.105557

Criado Léa , Barboni Alexandre , Carton Xavier

The PHYSINDIEN 2019 campaign occurred in the Northwestern Arabian Sea, during the spring intermonsoon, between 16 and 25 °N. Along its 3000 km transect, it sampled 5 anticyclones, 3 cyclones and 2 cyclonic submesoscale coherent vortices (SCV) with continuous hydrological and velocity measurements. Remarkably, the two cyclonic SCV were located beneath surface mesoscale anticyclones. Also, a water mass analysis shows that small anticyclones with Persian Gulf Water (PGW) are found in the Gulf of Oman, while anticyclones further south are shallower vortices containing Arabian Sea High Salinity Water (ASHSW). Comparison of in situ data with the META atlas, a state-of-the-art eddy detection and tracking atlas based on altimetry, reveals that eddy radii are often underestimated by remote sensing. In this atlas, eddy tracks are often discontinuous due to missing detections. Both hydrological measurements and remote-sensing tracking are however consistent in indicating that along the southern Omani coast anticyclones are formed offshore during the spring intermonsoon, near the center of the Arabian Sea. These results underline the diversity of surface and subsurface eddies in the sparsely explored Arabian Sea, and provide insight on the potential bias of their remote detections.

PHYSINDIEN 2019活动发生在阿拉伯海西北部的春季季风间期，位于北纬16°至25°之间。在3000公里的横断面上，通过连续的水文和速度测量，它采样了5个反气旋、3个气旋和2个气旋亚中尺度相干涡。值得注意的是，这两个气旋性SCV位于地面中尺度反气旋下方。此外，水团分析表明，在阿曼湾发现了含有波斯湾水（PGW）的小型反气旋，而在更南边的反气旋是含有阿拉伯海高盐度水（ASHSW）的较浅涡旋。将现场数据与META地图集（一种基于测高技术的最先进的涡流探测和跟踪地图集）进行比较，发现遥感往往低估了涡流半径。在这个图谱中，由于缺少检测，涡流轨迹常常是不连续的。然而，水文测量和遥感跟踪都一致地表明，在春季季风间期，在阿拉伯海中心附近，沿阿曼南部海岸近海形成了反气旋。这些结果强调了稀少的阿拉伯海表面和地下漩涡的多样性，并提供了对其远程探测的潜在偏差的见解。

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引用次数: 0

Plastic pollution: A potential vector of both pathogens and probiotics for corals on the Mascarene Ridge, Indian Ocean 塑料污染：印度洋马斯克林海岭珊瑚病原体和益生菌的潜在载体

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-23 DOI: 10.1016/j.dsr2.2025.105556

Vyctoria Marillac , Philippe Jourand , Pierre-Louis Stenger , Gwennais Fustemberg , Julie Gindrey , Margot Thibault

In marine environments, plastic debris serves as a vector for pathogenic bacteria that can negatively impact marine fauna, including corals. The Saya de Malha and Nazareth Banks, located in the Indian Ocean, harbor an extensive area of coral reefs that may be susceptible to diseases associated with plastic pollution. In this context, we aimed to determine whether plastic debris in this region can act as a vector for coral-associated pathogenic bacteria. During the "Indian Ocean mission 2022," floating plastic debris (>500 μm) was collected from the Saya de Malha region using manta trawling. The collected debris were quantified, classified by type, size, and weighed. The associated microbiome, along with the viable bacterial communities attached to the plastic, were analyzed using 16S rDNA high-throughput sequencing and traditional molecular and microbiological techniques. A high concentration of plastic debris was recorded both on Saya de Malha and Nazareth Bank, with 10⁵ items.km⁻². The mean viable bacterial count was 15,519 ± 9340 CFU/g of plastic debris. Nine bacterial phyla were identified, with Firmicutes (58 % of the total) and Proteobacteria (42 %) being the dominant groups. The bacterial diversity on the plastic was measured at 0.92, including coral pathogens, such as Acinetobacter (27 %), Psychrobacter (2 %), and Pseudomonas (2 %). In addition, probiotic bacteria such as Exiguobacterium (58 %), Rheinheimera (1 %), and Idiomarina (1 %) were also detected. This preliminary study states the presence of both pathogenic and probiotic coral-associated fixed to plastic. Further research is needed to confirm their direct effect on coral reef disease. Nevertheless, these findings add to the growing evidence of the widespread presence of plastic debris floating in the region.

在海洋环境中，塑料碎片是致病菌的载体，会对包括珊瑚在内的海洋动物产生负面影响。位于印度洋的Saya de Malha和拿撒勒浅滩拥有大面积的珊瑚礁，可能容易受到与塑料污染有关的疾病的影响。在这种情况下，我们的目的是确定该地区的塑料碎片是否可以作为珊瑚相关致病菌的载体。在“印度洋任务2022”期间，使用蝠鲼拖网在Saya de Malha地区收集了漂浮的塑料碎片（>500 μm）。收集到的碎片按类型、大小和重量进行了量化、分类。使用16S rDNA高通量测序和传统的分子和微生物学技术分析了相关的微生物组，以及附着在塑料上的活菌群落。在Saya de Malha和拿撒勒银行都记录到了高浓度的塑料碎片，有105件。平均活菌数为15519±9340 CFU/g。共鉴定出9个细菌门，其中厚壁菌门（占总数的58%）和变形菌门（42%）是优势类群。塑料上的细菌多样性测量为0.92，包括珊瑚病原体，如不动杆菌（27%），冻干杆菌（2%）和假单胞菌（2%）。此外，还检出了Exiguobacterium（58%）、Rheinheimera（1%）和Idiomarina（1%）等益生菌。本初步研究表明，与珊瑚相关的致病性和益生菌均固定在塑料上。需要进一步的研究来证实它们对珊瑚礁疾病的直接影响。然而，这些发现进一步证明，该地区漂浮着广泛存在的塑料碎片。

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引用次数: 0

Response of phytoplankton to eddy dipole structure in the Mozambican channel: An automated underway evaluation 莫桑比克海峡浮游植物对涡旋偶极子结构的响应：一种正在进行的自动评估

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-18 DOI: 10.1016/j.dsr2.2025.105554

Jordan Toullec , Millat Blanc , Pierrick Penven , Alexandre Epinoux , Natasha Buckiewicz , Emmanuelle Jaouen , Valentine Szrama , Margaux Noyon , Jean-François Ternon , Luis Felipe Artigas

Fine-scale oceanographic structures such as eddies, fronts, and filaments strongly influence biogeochemical and ecological processes. So far, the characterization of phytoplankton communities of the Mozambique Channel (MZC) was limited to in-situ sampling and satellite monitoring of chlorophyll-a biomass estimation. Few studies have looked at phytoplankton community composition. During the RESILIENCE cruise in 2022, three structures were sampled; an anticyclonic eddy, a frontal area and a cyclonic eddy. Phytoplankton functional groups (PFGs) were studied at small-scale (1 km) in subsurface (about 5m depth) waters using automated underway measurements. A multispectral fluorometer (FLP) and an automated pulse shape-recording flow cytometer (AFCM). The oceanographic mesoscale features clearly structured the phytoplankton groups with distinct patterns observed in each of the three areas studied. A relatively high concentration of brown pigmentary group (groups containing xanthophyll and carotenoids-like pigments) was observed in the cyclonic eddy. High abundance of nano-microeukaryotes and of prokaryotic phytoplankton (Synechococcus spp. and Prochlorococcus spp.) were identified in the cyclonic eddy. These differences could potentially affect higher trophic levels such as zooplankton, micronekton, large pelagic fish, mammals, and seabirds. Finally, this phytoplankton community differentiation could also impact biogeochemical processes such as carbon sequestration and nutrient dynamics in the MZC.

精细尺度的海洋结构，如漩涡、锋面和细丝等，对生物地球化学和生态过程有着强烈的影响。到目前为止，莫桑比克海峡浮游植物群落的特征仅限于原位采样和叶绿素-a生物量估算的卫星监测。很少有研究关注浮游植物群落组成。在2022年的RESILIENCE巡航期间，对三个结构进行了采样；一个反气旋涡旋，一个锋区和一个气旋涡旋。利用自动测量技术，在小尺度（1公里）水下（约5米深）研究了浮游植物官能团（PFGs）。一台多光谱荧光仪（FLP）和一台自动脉冲形状记录流式细胞仪（AFCM）。海洋学中尺度特征清晰地构造了浮游植物群，并在三个研究区域中观察到不同的模式。在气旋涡旋中观察到相对高浓度的棕色色素群（含有叶黄素和类胡萝卜素类色素的群）。在气旋涡旋中发现了大量的纳米微真核生物和原核浮游植物（聚藻球菌和原绿球藻）。这些差异可能会影响到更高营养水平的生物，如浮游动物、微型生物、大型远洋鱼类、哺乳动物和海鸟。最后，这种浮游植物群落分化还可能影响MZC的碳固存和营养动态等生物地球化学过程。

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引用次数: 0

Indonesian Throughflow into the Leeuwin Current and subtropical Indian Ocean 印尼通流进入列文流和副热带印度洋

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-17 DOI: 10.1016/j.dsr2.2025.105555

Asmi M. Napitu, Arnold L. Gordon, Shannon M. Bohman

Indonesian throughflow (ITF) spreads along two major pathways within the Indian Ocean: the westward route within the South Equatorial Current (SEC) and the southward route within the Leeuwin Current (LC) along western Australia. The LC pathway is favored over the SEC pathway when northward winds off the west coast of Australia are weak, such as during Ningaloo Niño in 2010–2014. In this study, we track the ITF spreading into the relatively saline southern Indian Ocean subtropics using the Argo data-derived Relative Fresh Water Content (RFWC) as a marker of ITF water. We contrast the spreading pattern during a strong LC period in 2010–2014 to that during a weak period in 2015–2019. The highest RFWC occurs in the upper 300 m, above the 25.5 kg/m³ density surface, and migrates westward from the LC as anticyclonic eddies at approximately 4 cm/s. Interannual variability in the RFWC is evident with advective lag times from the LC. The eddies mix their low-salinity ITF water into the salty subtropical water laterally along the density surfaces with an estimated diffusivity rate of 2.4 × 10² m²/s, affecting the overall freshwater budget of the subtropical gyre. Eddy shedding from the LC system represents an alternative pathway for ITF spreading into the Indian Ocean.

印度尼西亚通流（ITF）沿着印度洋内的两条主要路径传播：南赤道流（SEC）向西的路线和沿西澳大利亚的列文流（LC）向南的路线。当澳大利亚西海岸的北风较弱时，LC路径比SEC路径更受青睐，例如2010-2014年的Ningaloo Niño。在这项研究中，我们使用Argo数据得出的相对淡水含量（RFWC）作为ITF水的标记，跟踪ITF向相对咸水的南印度洋亚热带扩散。我们对比了2010-2014年强LC期间和2015-2019年弱LC期间的传播模式。最高的RFWC出现在300米以上，在25.5 kg/m3密度表面以上，并以大约4 cm/s的速度从LC向西移动。RFWC的年际变化与LC的平流滞后时间是明显的。涡旋将其低盐度的ITF水沿密度面侧向混合为副热带咸水，估计扩散率为2.4 × 102 m2/s，影响了副热带环流的整体淡水收支。低压系统的涡旋脱落是ITF向印度洋扩散的另一种途径。

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引用次数: 0

Clinging onto Arctic Benthos: Biogeography of Amathillopsis spinigera Heller, 1875 (Crustacea: Amphipoda), including its redescription 附著北极底栖动物：海勒的生物地理学，1875年（甲壳纲：片脚纲），包括它的重新描述

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-16 DOI: 10.1016/j.dsr2.2025.105552

Saskia Brix , Thea Sophie Elsig , Patricia Esquete , Áki Jarl Láruson , Katrin Linse , Elisabeth Schaal , Lydia Anastasia Schmidt , Carolin Uhlir , Johanna N.J. Weston , Anne-Nina Lörz

Amathillopsis spinigera Heller, 1875, is an enigmatic peracarid crustacean species found in the Arctic Ocean. During the summer of 2024, it was recorded in the HAUSGARTEN observatory for the first time, following 25 years of regular sampling as part of the Fram Strait Long-Term Ecological Research observatory. This study significantly broadens the known geographic and bathymetric range of A. spinigera, with a total of 46 specimens collected from HAUSGARTEN (HG) and cold seeps at Svyatogor Ridge, during two expeditions conducted in 2024. Further, our review of all publicly available database (historical) records for A. spinigera leads to an expansion of its depth range from 186 – 1972 m to 11 – 3182 m. Recent observations using remotely operated vehicles (ROVs) have confirmed their clinging behavior on organic structures such as worm tubes, likely elevating the species within the water column to facilitate food capture. Females at various life stages, including egg-bearing individuals, were observed alongside juveniles and males of different sizes, enabling a redescription of the species based on an integrative taxonomy approach that incorporates both molecular and morphological data. The study also highlights biogeographic patterns, with a notable preference for eastern occurrences along the Arctic continental slope. While gaps in data from Greenland and Canadian regions, coupled with minimal sampling in the Central Arctic Ocean, suggest potential sampling bias, circumarctic connectivity appears plausible. This inference is supported by high genetic similarity in barcode data from individuals found across distant geographic locations.

amathillosis spinigera Heller, 1875，是在北冰洋发现的一种神秘的过硬壳类动物。在2024年夏天，它在HAUSGARTEN天文台首次被记录下来，此前25年的定期采样是Fram海峡长期生态研究天文台的一部分。该研究通过在2024年进行的两次探险中从HAUSGARTEN （HG）和Svyatogor Ridge的冷泉中采集的46个标本，大大拓宽了棘刺草已知的地理和水深范围。此外，我们回顾了所有公开的棘棘刺槐数据库（历史）记录，发现其深度范围从186 - 1972 m扩大到11 - 3182 m。最近使用遥控车辆（rov）的观察证实了它们在有机结构（如蠕虫管）上的粘附行为，可能会提升水柱内的物种，以促进食物捕获。研究人员观察了不同生命阶段的雌性，包括产卵的个体，以及不同大小的幼鱼和雄性，从而基于结合分子和形态数据的综合分类方法对物种进行了重新描述。该研究还强调了生物地理模式，明显倾向于北极大陆斜坡上的东部事件。虽然格陵兰岛和加拿大地区的数据存在差距，加上北冰洋中部的采样很少，表明存在潜在的采样偏差，但环北极地区的连通性似乎是合理的。这一推断得到了来自遥远地理位置的个体的条形码数据的高度遗传相似性的支持。

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引用次数: 0

The impacts of El Niño Southern Oscillation on the pelagic fish community structure of the northern Humboldt Current system El Niño南方涛动对北洪堡流系统中上层鱼类群落结构的影响

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-14 DOI: 10.1016/j.dsr2.2025.105553

Paola Galloso , Giancarlo M. Correa , Pierre Legendre

The northern Humboldt Current System (HCS) is a highly productive eastern boundary upwelling system off Peru. El Niño Southern Oscillation (ENSO) is one of the main drivers of short-term climate variability, whose warm (El Niño) and cold (La Niña) phases can trigger changes in the physical, chemical, biological, and socioeconomic conditions of the northern HCS. We explored the impacts of ENSO phases and magnitude in the region over the structure of the pelagic fish community in the northern HCS through the study of spatial and temporal beta diversity changes. To achieve this goal, we used 25-year taxonomic composition data from pelagic scientific surveys and statistical multivariate methods. We found that, depending on the magnitudes, most of the El Niño (EN) categories substantially increased the diversity index values in this system with respect to the neutral phase. In contrast, La Niña (LN) decreased it. The community spatial structure principally showed three ecological regions, which varied in extension, indicator species, and composition across ENSO phases. The local contribution to beta diversity (LCBD) showed that the shelf break is essential in shaping the community structure among ENSO phases. The changes in temporal beta diversity suggest that the spatial structure or change of the community abundance is influenced by the magnitude of the EN phase. We conclude that the oceanographic changes caused by the ENSO phases may significantly impact the fish community structure in the northern HCS. Our results are relevant to implementing climate-ready management measures in this ecosystem.

北洪堡流系统（HCS）是秘鲁附近一个高产的东边界上升流系统。El Niño南方涛动（ENSO）是短期气候变率的主要驱动因素之一，其暖相（El Niño）和寒相（La Niña）可引发北半球HCS的物理、化学、生物和社会经济条件的变化。通过时空β多样性变化研究，探讨ENSO期次和强度对高寒带北部中上层鱼类群落结构的影响。为了实现这一目标，我们使用了25年来远洋科学调查的分类组成数据和统计多元方法。我们发现，根据不同的量级，大多数El Niño （EN）类别在该系统中相对于中性相的多样性指数值显着增加。而La Niña （LN）则使其降低。群落空间结构主要表现为3个生态区，其扩展范围、指示物种和组成在ENSO不同阶段均存在差异。对β多样性（LCBD）的局部贡献表明，大陆架断裂对ENSO各阶段群落结构的形成至关重要。时间β多样性的变化表明，群落丰度的空间结构或变化受EN期大小的影响。因此，ENSO期引起的海洋学变化可能会显著影响高寒带北部鱼类群落结构。我们的研究结果与在该生态系统中实施气候准备管理措施有关。

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引用次数: 0

Awareness-raising, communication methods and objectives for an ocean expedition: the example of the Monaco explorations Indian Ocean expedition 2022 海洋探险的意识提升、沟通方法和目标：以摩纳哥探险队2022年印度洋探险为例

IF 3 3区地球科学 Q2 OCEANOGRAPHY

Deep-sea Research Part Ii-topical Studies in Oceanography

Pub Date : 2025-10-02 DOI: 10.1016/j.dsr2.2025.105551

Didier Théron , Océane Gasquy , François Simard , Dominique Benzaken , Elise Rigot , Amwar Bhai Rumjaun , Stéphane Dugast , Rémi Leroy , Carolyn Scheurle

The 2022 Indian Ocean Expedition organised by Monaco Explorations rolled out an ambitious outreach and communication strategy to raise awareness among a wide range of audiences about critical ocean issues and share the expedition outcomes with various target groups: the media, the general public, decision-makers and civil society stakeholders, teachers, the young generation, etc. This article provides an in-depth critical analysis of the objectives, design, and implementation of outreach mechanisms and the results achieved, using quantitative and qualitative indicators to highlight successes, limitations, and challenges, particularly in terms of assessing the results and the ownership of issues. In conclusion, a number of avenues are proposed to amplify and optimise the impact of such outreach and communication activities and their contribution to the Ocean Literacy approach, particularly in the context of the United Nations Decade of Ocean Science for Sustainable Development (2021–2030).

由摩纳哥探险公司组织的2022年印度洋考察队推出了一项雄心勃勃的外展和沟通战略，以提高广大受众对关键海洋问题的认识，并与各种目标群体分享考察队的成果：媒体、公众、决策者和民间社会利益相关者、教师、年轻一代等。本文对外联机制的目标、设计和实施以及取得的成果进行了深入的批判性分析，使用定量和定性指标来突出成功、限制和挑战，特别是在评估结果和问题所有权方面。最后，提出了一些途径，以扩大和优化此类外联和传播活动的影响及其对海洋扫盲方法的贡献，特别是在联合国海洋科学促进可持续发展十年（2021-2030）的背景下。

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引用次数: 0