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Colonization dynamics of periphytic protozoa in a tropical marine ecosystem 热带海洋生态系统中周边原生动物的定植动态
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-09-07 DOI: 10.1017/S0025315423000528
Mohammad Jahed Hasan Bhuain, M. N. A. Sikder, Sayeed Mahmood Belal Haider, Abu Sayeed Muhammad Sharif, Sheikh Aftab Uddin, SM Sharifuzzaman, Henglong Xu
Abstract For the bioassessment of tropical marine ecosystem, a survey of protozoa colonizing artificial substrate was conducted in the coastal waters of northern Bay of Bengal, Bangladesh. Protozoan samples were collected using glass slides from 1 and 2 m water depths at time intervals of 3, 7, 10, 14, 21, and 28 days during winter and monsoon seasons. Thus, the colonization processes of protozoa were assigned into three stages namely the initial (3 days), transitional (7 days), and equilibrium stages (10–28 days) at two depths in two seasons. Regression analyses demonstrated that the colonization dynamics of protozoa were well fitted to the MacArthur-Wilson model and logistic equation. Species richness reached equilibrium after 10–14 days and species abundance was maximum at a depth of 1 m. These results suggest that samples of protozoa can be collected at 1 m depth in winter season for monitoring the ecological health of tropical marine ecosystems.
摘要为了对热带海洋生态系统进行生物评价,在孟加拉国孟加拉湾北部沿海水域进行了原生动物定殖人工基质的调查。在冬季和季风季节,以3、7、10、14、21和28天的时间间隔,使用玻璃载玻片从1米和2米水深采集原生动物样本。因此,原生动物的定殖过程分为三个阶段,即两个季节中两个深度的初始阶段(3天)、过渡阶段(7天)和平衡阶段(10-28天)。回归分析表明,原生动物的定殖动力学符合MacArthur-Wilson模型和logistic方程。物种丰富度在10-14天后达到平衡,物种丰富度在1米深处达到最大。这些结果表明,在冬季可以在1米深度采集原生动物样本,用于监测热带海洋生态系统的生态健康。
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引用次数: 0
A first genome survey sequencing of alvinocaridid shrimp Shinkaicaris leurokolos in deep-sea hydrothermal vent environment 深海热液喷口环境中Alvinocarid虾Shinkaicaris leurokolos的首次基因组调查测序
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-09-06 DOI: 10.1017/S0025315423000504
Aiyang Wang, Jiao Cheng, Qian Xin, Z. Sha, Min Hui
Abstract The alvinocaridid shrimp Shinkaicaris leurokolos Kikuchi and Hashimoto, 2000, is an evolutionarily important deep-sea species in hydrothermal vents of north-western Pacific. A genome survey of S. leurokolos was carried out in order to provide a foundation for its whole-genome sequencing. A total of 599 Gb high-quality sequence data were obtained in the study, representing approximately 118× coverage of the S. leurokolos genome. According to the 17-mer distribution frequency, the estimated genome size was 5.08 Gb, and its heterozygosity ratio and percentage of repeated sequences were 2.85 and 87.03%, respectively, showing a complex genome. The final scaffold assembly accounted for a total size of 9.53 Gb (32,796,062 scaffolds, N50 = 597 bp). Repetitive elements nearly constituted 45% of the nuclear genome, among which the most ubiquitous were long interspersed nuclear elements, DNA transposons and long-terminal repeat elements. A total of 12,121,553 genomic simple sequence repeats were identified, with the most frequent repeat motif being di-nucleotide (70.27%), followed by tri-nucleotide and tetra-nucleotide. From the genome survey sequences, the mitochondrial genome of S. leurokolos was also constructed and 71 single nucleotide polymorphisms were identified by comparison with previous published reference. This is the first report of de novo whole-genome sequencing and assembly of S. leurokolos. These newly developed genomic data contribute to a better understanding of genomic characteristics of shrimps from deep-sea chemosynthetic ecosystems, and provides valuable resources for further molecular marker development.
摘要菊池新海虾和桥本虾,2000年,是西北太平洋热液喷口中进化上重要的深海物种。对勒氏乳杆菌进行了基因组调查,为其全基因组测序奠定了基础。该研究共获得599Gb的高质量序列数据,代表了S.leurokolos基因组的约118倍覆盖率。根据17mer的分布频率,估计的基因组大小为5.08Gb,其杂合率和重复序列百分比分别为2.85%和87.03%,显示出复杂的基因组。最终支架组件的总尺寸为9.53 Gb(32796062个支架,N50=597bp)。重复元件几乎占核基因组的45%,其中最常见的是长穿插核元件、DNA转座子和长末端重复元件。共鉴定出12121553个基因组简单序列重复,最常见的重复基序是二核苷酸(70.27%),其次是三核苷酸和四核苷酸。从基因组调查序列中,还构建了S.leurokolos的线粒体基因组,并通过与先前发表的参考文献的比较,鉴定了71个单核苷酸多态性。这是第一份关于S.leurokolos的从头全基因组测序和组装的报告。这些新开发的基因组数据有助于更好地了解深海化学合成生态系统中虾的基因组特征,并为进一步开发分子标记提供了宝贵的资源。
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引用次数: 0
A fluke encounter: first record of the blue whale (Balaenoptera musculus) within the central North Sea, United Kingdom 偶然相遇:英国北海中部蓝鲸(Balaenoptera musculus)的首次记录
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-09-05 DOI: 10.1017/S0025315423000516
Edward Lavallin, N. Øien, Richard Sears
Abstract Despite holding the accolade as the largest animal ever to live on planet earth and ubiquitously inhabiting the world's major oceans, an acute paucity of information surrounds the geographical distribution and migration phenology of the endangered blue whale (Balaenoptera musculus) in the northeast Atlantic. Current migration and distribution information derived from robust scientific studies is required to ensure the formulation and implementation of successful conservation measures with a vision to support the ongoing recovery of the northeast Atlantic population. At 10:21 (UTC) on the 9th of November 2020, two blue whales were observed at position 55°13.99′N, 01°13.62′W, 18 km off the coast of the UK in the central North Sea just north of Newcastle at a water depth of 76 m. This is the first paper that has confirmed an account of live blue whales frequenting shallow waters of the central North Sea and represents a new area of occurrence within the accepted range of the northeast Atlantic population, an area in which sightings are extremely rare and may provide insight into the intricacies of migration routes and behaviour.
尽管拥有地球上有史以来最大的动物的称号,并且无处不在地生活在世界主要海洋中,但关于大西洋东北部濒临灭绝的蓝鲸(Balaenoptera musculus)的地理分布和迁徙物候的信息严重缺乏。需要从可靠的科学研究中获得目前的迁徙和分布信息,以确保制定和执行成功的保护措施,以期支持东北大西洋种群的持续恢复。2020年11月9日10点21分(世界标准时间),在纽卡斯尔以北的北海中部距离英国海岸18公里的地方,在水深76米的地方,发现了两头蓝鲸。这是第一篇证实活蓝鲸经常出没于北海中部浅水区的论文,代表了在东北大西洋种群的可接受范围内出现的新区域,这是一个极其罕见的区域,可能为了解复杂的迁徙路线和行为提供洞见。
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引用次数: 0
Insights obtained from a multidecadal citizen science scheme: grey seal (Halichoerus grypus) strandings in Cornwall and Isles of Scilly (2000–2020) 从数十年公民科学计划中获得的见解:康沃尔和锡利群岛的灰海豹(Halichoerus grypus)搁浅(2000-2020)
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-08-25 DOI: 10.1017/S0025315423000589
Helen S. Chadwick, James F. Barnett, Abigail Crosby, Anthea Hawtrey-Collier, Victoria J. Hobson, L. C. Omeyer, Ruth Williams, B. Godley
Abstract Changes in abundance and distribution of marine top predators can indicate environmental change or anthropogenic pressure requiring management response. Here, we used an extensive dataset (21 years) to conduct a spatial and temporal analysis of grey seal strandings in Cornwall and the Isles of Scilly, close to the southern edge of the breeding range of the species. A total of 2007 strandings were reported from 2000 to 2020, increasing by 474% from 35 to 201 individuals per year during this period. The continued rise in strandings was consistent across all life stages and timeframes (5, 10 and 20 years), underpinning the suggestion of increasing abundance in the region. The observed seasonality differed by life stage, coinciding with the increased presence of animals near the coast for key life phases such as breeding, moulting and pupping. Strandings are widely distributed across the coast of Cornwall and the Isles of Scilly; however, most strandings were recorded on the north coast of Cornwall (70%) where major pupping and haul out sites are found. Despite hosting several pupping and haul out sites, a small proportion was recorded on the Isles of Scilly (5%) where it is thought that strandings are particularly underreported. Describing baselines in magnitude of strandings and life-stage compositions across space and time allows future deviations in frequency, demographic composition or spatial distribution to be detected and investigated. We demonstrate the utility of long-term citizen science data to provide valuable and cost-effective information on the distribution and abundance of a highly mobile marine mammal.
摘要海洋顶级捕食者丰度和分布的变化可能表明环境变化或需要管理响应的人为压力。在这里,我们使用了一个广泛的数据集(21年),对康沃尔郡和锡利群岛的灰海豹搁浅进行了时空分析,这些地方靠近该物种繁殖范围的南部边缘。从2000年到2020年,共报告了2007起搁浅事件,在此期间每年从35起增加到201起,增幅为474%。搁浅事件的持续增加在所有生命阶段和时间框架(5年、10年和20年)都是一致的,这为该地区丰度增加的说法提供了基础。观察到的季节性因生命阶段而异,与海岸附近动物在繁殖、换羽和幼崽等关键生命阶段的增加相吻合。搁浅现象广泛分布在康沃尔海岸和锡利群岛;然而,大多数搁浅事件都发生在康沃尔郡的北海岸(70%),那里发现了主要的幼崽和拖运地点。尽管有几个幼崽和拖运地点,但在锡利群岛(5%)记录到的一小部分搁浅事件被认为特别少。通过描述空间和时间上搁浅数量和生命阶段组成的基线,可以检测和调查未来频率、人口组成或空间分布的偏差。我们证明了长期公民科学数据的效用,可以提供关于高度流动的海洋哺乳动物的分布和丰度的有价值和成本效益的信息。
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引用次数: 0
Introduction of the euryhaline epibenthic hydromedusa Vallentinia gabriellae Vannucci Mendes, 1948 (Hydrozoa: Limnomedusae) to Indian waters 泛盐底栖水生水母valentinia gabriellae Vannucci Mendes, 1948引进印度水域(水生动物:Limnomedusae)
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-08-15 DOI: 10.1017/S002531542300053X
Hari Praved, K. B. Neethu, P. H. Praved, K. V. Neethu, Annette F. Govindarajan, S. Nandan, B. Aneesh, P. Jayachandran
Abstract The epibenthic euryhaline hydromedusa Vallentinia gabriellae Vannucci Mendes, 1948 is an olindiid species native to tropical Atlantic waters. Here, we describe the cryptic introduction of this species in an estuary along the coast of Kerala, in southwestern India. This study records the existence of V. gabriellae outside of Atlantic waters for the first time and documents its geographical range expansion. Our identification was based on a combined morphological and DNA barcoding assessment using the COI and 28S markers. Although we noted some morphological differences between our specimens and those from their native range, our findings were conclusive. We suggest that phenotypic plasticity may result from differences such as prey availability between the native and introduced habitats. V. gabriellae medusae are epibenthic and cling to a variety of hard and soft substrates, including bivalves. Our specimens were associated with the invasive fouling mussel Mytella strigata, and we suggest that V. gabriellae could have been transported along with these mussels to the Kerala coast.
摘要表海底广盐水藻Vallentinia gabriellae Vannucci Mendes,1948是一种原产于热带大西洋水域的olindiid物种。在这里,我们描述了该物种在印度西南部喀拉拉邦海岸河口的神秘引入。这项研究首次记录了V.gabriellae在大西洋水域外的存在,并记录了其地理范围的扩大。我们的鉴定是基于使用COI和28S标记的形态学和DNA条形码联合评估。尽管我们注意到我们的标本与它们的本土标本之间存在一些形态学差异,但我们的发现是决定性的。我们认为表型可塑性可能是由于原生栖息地和引入栖息地之间的猎物可用性等差异造成的。M.gabriellae medusae是表海底生物,附着在各种坚硬和柔软的基质上,包括双壳类。我们的标本与入侵污染贻贝Mytella strigata有关,我们认为V.gabriellae可能与这些贻贝一起被运送到喀拉拉邦海岸。
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引用次数: 0
Biogeographic patterns of distribution of the mollusc Zelentia ninel (Nudibranchia, Trinchesiidae) 软体动物海螺分布的生物地理格局(海鳃目,海螺科)
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-08-04 DOI: 10.1017/S0025315423000498
Fredrik Broms, T. Bakken, A. Martynov, T. Korshunova
Abstract In the present contribution we report, for the first time, records of the nudibranch Zelentia ninel from Norway. The species is previously known only from the Barents Sea coast in northern Russia where it was described for the first time in 2017. Records of Z. ninel from six different localities in northern Norway from 2019–2023 are presented and discussed. The identity of the specimens was determined by investigation of external and internal morphology as well as molecular analysis of preserved specimens. Photographs of live specimens and radulae of preserved specimens are presented, and species delimitation is confirmed by molecular phylogenetic analysis. In order to assess the biogeographic distribution of Z. ninel based on all available information, recent unanticipated genetic data supporting a putative occurrence of Z. ninel at the Aleutian Islands, Alaska is also discussed where we provide arguments in support of occasional anthropogenic transportation outside its natural range. The present records significantly expand the known natural range of distribution for Z. ninel and demonstrate that the species is not restricted to the Russian Barents Sea coast but that the range encompasses also at least northern Norway. These data can provide important insights to the understanding of natural ranges of marine invertebrates across biogeographical regions affected by rapid ongoing climatic change.
摘要在本文中,我们首次报道了来自挪威的裸枝泽伦蒂亚ninel的记录。该物种以前只在俄罗斯北部的巴伦支海海岸已知,2017年在那里首次被描述。介绍并讨论了2019年至2023年挪威北部六个不同地区的Z.niel记录。通过对保存标本的外部和内部形态的研究以及分子分析,确定了标本的身份。展示了活标本的照片和保存标本的radulae,并通过分子系统发育分析证实了物种的划界。为了根据所有可用信息评估Z.neel的生物地理分布,还讨论了最近的意外遗传数据,这些数据支持Z.neer在阿拉斯加阿留申群岛的假定发生,我们在这些数据中提供了支持其自然范围外偶尔发生的人为运输的论据。目前的记录大大扩大了已知的Z.niel的自然分布范围,并表明该物种不仅限于俄罗斯巴伦支海海岸,而且该范围至少包括挪威北部。这些数据可以为了解受快速持续气候变化影响的生物地理区域海洋无脊椎动物的自然范围提供重要见解。
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引用次数: 0
Age, growth and otolith morphometrics of Serranus hepatus (L., 1758) in two areas of the Eastern Mediterranean 东地中海两个地区肝Serranus hepatus(L.,1758)的年龄、生长和耳石形态计量学
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-08-01 DOI: 10.1017/S0025315423000474
Vasiliki Nikiforidou, E. Gkikas, C. Mytilineou, J. Haralabous, D. Koutsoubas, A. Anastasopoulou
Abstract Serranus hepatus is a bycatch species in the Mediterranean trawl fishery for which knowledge on biological features such as otolith morphology is generally poor in the Mediterranean Sea. In the present study, the weight–length relationship, age, growth and ten otolith morphometric variables of this species were investigated in two distant areas, the Eastern Ionian and southwestern Aegean Seas. Isometric growth in weight was defined in both areas. Growth parameters also did not differ between the two study areas. Six of the otolith variables (radius, otolith length, otolith width, otolith area, perimeter and ellipticity) showed a significant relationship with size without significant differences between the two areas. Significant differences between the two areas were only defined for five of the morphometric variables (otolith length, width and area being the most important). Further studies to discriminate between potential stocks of S. hepatus seem to be necessary, information that is needed for stock identification, stock assessment and fisheries management.
摘要肝Serranus hepatus是地中海拖网渔业中的一种副渔获物,其耳石形态等生物学特征在地中海普遍缺乏了解。在本研究中,在爱奥尼亚海东部和爱琴海西南部这两个遥远的地区调查了该物种的重量-长度关系、年龄、生长和十个耳石形态计量变量。在这两个领域都定义了体重的等距增长。两个研究区域的生长参数也没有差异。六个耳石变量(半径、耳石长度、耳石宽度、耳石面积、周长和椭圆度)显示出与大小的显著关系,而两个区域之间没有显著差异。两个区域之间的显著差异仅针对五个形态计量变量(耳石长度、宽度和面积是最重要的)进行了定义。似乎有必要进行进一步的研究,以区分肝吸虫的潜在种群,这是种群识别、种群评估和渔业管理所需的信息。
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引用次数: 1
New data on South American fur seals and sea lions' occupation of the Wildlife Refuge of Ilha dos Lobos, southern Brazil 关于南美洲海豹和海狮占领巴西南部Lobos岛野生动物保护区的新数据
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-07-28 DOI: 10.1017/S0025315423000425
Natália Procksch, P. H. Ott, Natalia Bragiola Berchieri, D. Danilewicz, Rafael Kenji Horota, M. Guimarães, Marcelo Zagonel, M. Veronez, L. Oliveira
Abstract We present the most recent data on the seasonal and spatial occupation of South American sea lions (Otaria flavescens) and fur seals (Arctocephalus australis) in the Wildlife Refuge of Ilha dos Lobos (WRIL) in southern Brazil throughout the year, based on aerial photographic counts. Thirty-one aerial photographic counts were conducted between July 2019 and November 2020 to assess monthly differences in the abundance of pinnipeds in the WRIL. The results were analysed using a generalized linear model. Spatial analysis was performed using kernel density. Subadult males of South American sea lion were the most abundant pinniped in the WRIL, followed by juveniles of South American fur seal. A juvenile of Southern elephant seal (Mirounga leonina) was also recorded. South American fur seals showed a marked seasonality, occurring only between July and October, while South American sea lions occurred year-round. Among the months analysed, September exhibited the highest mean abundance (mean 113.75; SD: ± 8.58), followed by August (mean 103.00; SD: ± 15.69). The pinnipeds were more often concentrated in the northern and central parts of the island. This study reinforces the importance of the WRIL as a haulout site for pinnipeds. Considering the seasonal occupation of the island by South American pinnipeds, monitoring is recommended prior to the development of activities in the area.
摘要:本文基于航空摄影数据,介绍了巴西南部Ilha dos Lobos野生动物保护区(WRIL)南美洲海狮(Otaria flavescens)和海豹(Arctocephalus australis)全年的季节和空间分布情况。2019年7月至2020年11月期间进行了31次航空摄影计数,以评估wwrl中鳍足类动物丰度的月度差异。结果用广义线性模型进行了分析。利用核密度进行空间分析。其中,南美海狮的亚成年雄性鳍状肢数量最多,其次是南美海海豹的幼崽。南象海豹(miounga leonina)幼崽也有记录。南美海狗的活动具有明显的季节性,只在7月到10月之间发生,而南美海狮全年都有活动。在分析月份中,9月平均丰度最高,平均113.75;SD:±8.58),其次是8月(平均103.00;Sd:±15.69)。鳍足类动物更多地集中在岛屿的北部和中部。这项研究强化了WRIL作为鳍足类拖出位点的重要性。考虑到南美洲鳍足类动物对该岛的季节性占领,建议在该地区开展活动之前进行监测。
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引用次数: 1
Assessing Guiana dolphin abundance and density in the Southwestern Atlantic: insights from conservation areas 评估西南大西洋圭亚那海豚的丰度和密度:来自保护区的见解
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-07-25 DOI: 10.1017/S0025315423000486
Inaê Guion de Almeida, A. Percequillo, M. M. Rollo
Abstract Accurate demographic data play a critical role in implementing conservation strategies and identifying key areas for species preservation. The population abundance and density of Sotalia guianensis were estimated in the estuarine-lagoon complex of Cananéia, Brazil, using distance sampling. The survey covered 1339.91 km with 83 h 05 min in effort. A half-normal model with cosine adjustments was evaluated as the best fit to estimate an abundance of 193 individuals (95% CI 158–237) and a density of 2.55 ind km−2. The majority of sightings occurred in the Baía de Trapandé (48.72%), followed by the Mar de Cananéia (32.72%) and Mar de Cubatão (18.56%), the three areas surrounding the Ilha de Cananéia. The study confirmed the heterogeneous distribution of the estuary and found that the Mar de Cananéia and the Baía de Trapandé were more densely populated, with 2.76 ind km−2 (95% CI 1.93–3.96) and 2.76 ind km−2 (95% CI 2.07–3.66), respectively, while the Mar de Cubatão was less densely populated, with 1.59 ind km−2 (95% CI 1.04–2.44). The findings support previous research indicating a stable population over the last few decades. The Cananéia estuary is an ecologically diverse region located between protected areas under different categories of environmental protection and harbours a significant population of S. guianensis, providing essential resources for feeding and breeding. Protected areas have proven to be effective tools for preserving both marine and terrestrial environments. Despite the close proximity to humans and constant threats, the study underscores the importance of the area for the conservation of the species.
摘要准确的人口统计数据在实施保护战略和确定物种保护的关键领域方面发挥着关键作用。采用距离采样法,对巴西卡纳尼亚河口泻湖复合体中的圭亚那苏塔利亚种群丰度和密度进行了估算。调查行程1339.91公里,耗时83小时05分钟。经过余弦调整的半正态模型被评估为最适合估计193个个体的丰度(95%CI 158–237)和2.55 ind km−2的密度。大多数目击事件发生在特拉潘湾(48.72%),其次是卡纳内亚岛(32.72%)和库巴托岛(18.56%),这三个地区都是卡纳内亚岛周围的地区。该研究证实了河口的不均匀分布,并发现Mar de Cananéia和Baía de Trapané的人口密度更高,分别为2.76 ind km−2(95%CI 1.93–3.96)和2.76 inde km−2,而Mar de Cubatão的人口密度较低,1.59 ind km−2(95%置信区间1.04–2.44)。这些发现支持了先前的研究,表明在过去几十年中人口稳定。Cananéia河口是一个生态多样的地区,位于不同环境保护类别的保护区之间,拥有大量圭亚那S.guianensis,为觅食和繁殖提供了重要资源。保护区已被证明是保护海洋和陆地环境的有效工具。尽管距离人类很近,威胁不断,但这项研究强调了该地区对保护该物种的重要性。
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引用次数: 0
Spatial–temporal variability of phytoplankton community and potentially harmful species in the Golden Horn Estuary (Sea of Marmara, Türkiye) 金角河口(马尔马拉海)浮游植物群落及潜在有害物种的时空变异特征
IF 1.2 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2023-07-24 DOI: 10.1017/S0025315423000449
Sebahat Semin, S. Tas, Fuat Dursun
Abstract Spatial–temporal variability of phytoplankton community and potentially harmful species in the Golden Horn Estuary (Sea of Marmara) was investigated from October 2018 to September 2019 together with some environmental factors. A total of 148 phytoplankton taxa were identified during the study period. Among these, 134 taxa (90.5%) consisted of diatoms (71 taxa, 48%) and dinoflagellates (63 taxa, 42.5%), while 14 taxa (9.5%) were other groups. Seventeen species were recorded for the first time in the study area. Species richness was highest in October, while it was lowest in August. The species diversity (H') varied according to sampling stations. Cell abundances were higher especially in the middle and upper estuary in spring and summer than in autumn and winter. The abundance of diatoms and euglenophyceans was highest in spring, while the abundance of raphidophycean and cryptophycean was highest in summer. Temperature was correlated positively with total abundance (P < 0.01), but negatively with species diversity (H') (P < 0.01). Several dense algal blooms causing discolouration in surface water occurred in spring and summer. A total of 12 microalgae species known as potentially toxic were detected during this study period. Among these, dinoflagellates Alexandrium cf. tamarense and Dinophysis infundibulum were recorded for the first time in the study area. The increase in species diversity and richness in the upper estuary, and the decrease in frequency of bloom events compared with the previous years indicated the changes in environmental conditions in this study period. Findings showed that phytoplankton might be used as an indicator of the changing environmental conditions in such ecosystems.
摘要2018年10月至2019年9月,对金角湾(马尔马拉海)浮游植物群落和潜在有害物种的时空变异性以及一些环境因素进行了调查。在研究期间,共鉴定了148个浮游植物分类群。其中,硅藻(71个类群,48%)和甲藻(63个类群,42.5%)组成134个类群(90.5%),其他类群14个类群(9.5%)。研究区首次记录到17个物种。物种丰富度在10月份最高,而在8月份最低。物种多样性(H')随采样站的不同而变化。细胞丰度在春季和夏季高于秋季和冬季,尤其是在河口中上部。硅藻和裸藻的丰度在春季最高,而萝卜藻和隐藻的丰度则在夏季最高。温度与总丰度呈正相关(P<0.01),但与物种多样性(H')呈负相关性(P<0.01)。在本研究期间,共检测到12种已知具有潜在毒性的微藻。其中,研究区首次记录到亚历山大藻和漏斗藻。与前几年相比,上河口物种多样性和丰富度的增加,以及水华事件频率的降低,表明了本研究期间环境条件的变化。研究结果表明,浮游植物可以作为此类生态系统中环境条件变化的指标。
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引用次数: 0
期刊
Journal of the Marine Biological Association of the United Kingdom
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