Journal of the Marine Biological Association of the United Kingdom最新文献_第7页

Opening Pandora's box: diagnostics characters for the confuse taxonomy of the Brazilian Cardiomya (Bivalvia: Cuspidariidae) 打开潘多拉的盒子：巴西红心贻贝（双壳类：瓣鳃纲）分类混乱的诊断特征

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2024-02-12 DOI: 10.1017/s0025315424000031

Tarcilla Carvalho de Lima, Victor Barreto Braga Mello, Cléo Dilnei de Castro Oliveira

The unsolved systematics of the genus Cardiomya has led to a sequence of astonishing identification mistakes. This scenario is a result of the rarity of specimens and, more importantly, the lack of knowledge about which characters are relevant to the genus taxonomy. In this study, we developed a method based on standard linear discriminant analysis to identify the smallest number of morphological characters that efficiently distinguish individuals at the species level of Brazilian Cardiomya. Starting from 29 morphometric measurements obtained from photographed Cardiomya shells, we were able to identify only five characters: the dorsal inflection of the rostrum, the distance from the posterior most rib end to the umbonal posterior margin and the distance from the central point of the valve to the anterior margin at 45°, 15° and −30° angles. Surprisingly, all these characters are related to the shell outline and not the ornamentation, which is a remarkable character in Cardiomya. We performed a one-way ANOVA with post-hoc Tukey HSD test specifically using the total number of ribs to verify its discriminant power in species identification. Our analysis demonstrated that the number of ribs does not show a significant difference between the analysed species.

红心蝠属（Cardiomya）尚未解决的系统学问题导致了一系列令人震惊的鉴定错误。造成这种情况的原因是标本的稀有性，更重要的是对哪些特征与该属分类相关缺乏了解。在这项研究中，我们开发了一种基于标准线性判别分析的方法，以确定能够有效区分巴西红心蝠属物种个体的最小数量的形态特征。从拍摄的 Cardiomya 贝壳中获得的 29 个形态测量值中，我们只鉴定出了五个特征：喙背侧弯、肋骨最后端到脐部后缘的距离、45°、15° 和 -30° 角的瓣膜中心点到前缘的距离。令人惊讶的是，所有这些特征都与外壳轮廓有关，而与装饰无关，而装饰是红心瓣鳃纲的一个显著特征。我们专门使用肋骨总数进行了单因素方差分析和事后的 Tukey HSD 检验，以验证其在物种鉴定中的鉴别力。我们的分析表明，肋骨的数量在所分析的物种之间并不存在显著差异。

{"title":"Opening Pandora's box: diagnostics characters for the confuse taxonomy of the Brazilian Cardiomya (Bivalvia: Cuspidariidae)","authors":"Tarcilla Carvalho de Lima, Victor Barreto Braga Mello, Cléo Dilnei de Castro Oliveira","doi":"10.1017/s0025315424000031","DOIUrl":"https://doi.org/10.1017/s0025315424000031","url":null,"abstract":"The unsolved systematics of the genus Cardiomya has led to a sequence of astonishing identification mistakes. This scenario is a result of the rarity of specimens and, more importantly, the lack of knowledge about which characters are relevant to the genus taxonomy. In this study, we developed a method based on standard linear discriminant analysis to identify the smallest number of morphological characters that efficiently distinguish individuals at the species level of Brazilian Cardiomya. Starting from 29 morphometric measurements obtained from photographed Cardiomya shells, we were able to identify only five characters: the dorsal inflection of the rostrum, the distance from the posterior most rib end to the umbonal posterior margin and the distance from the central point of the valve to the anterior margin at 45°, 15° and −30° angles. Surprisingly, all these characters are related to the shell outline and not the ornamentation, which is a remarkable character in Cardiomya. We performed a one-way ANOVA with post-hoc Tukey HSD test specifically using the total number of ribs to verify its discriminant power in species identification. Our analysis demonstrated that the number of ribs does not show a significant difference between the analysed species.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Unveiling the wasp-waist structure of the Falkland shelf ecosystem: the role of Doryteuthis gahi as a keystone species and its trophic influences 揭示福克兰大陆架生态系统的黄蜂腰结构：Doryteuthis gahi 作为关键物种的作用及其营养影响

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2024-02-12 DOI: 10.1017/s0025315423000887

Tobias Büring, Jesse van Der Grient, Graham Pierce, Paco Bustamante, Marco Scotti, Jessica B. Jones, Francisco Rocha, Alexander Arkhipkin

The Falkland Shelf is a highly productive ecosystem in the Southwest Atlantic Ocean. It is characterized by upwelling oceanographic dynamics and displays a wasp-waist structure, with few intermediate trophic-level species and many top predators that migrate on the shelf for feeding. One of these resident intermediate trophic-level species, the Patagonian longfin-squid Doryteuthis gahi, is abundant and plays an important role in the ecosystem. We used two methods to estimate the trophic structure of the Falkland Shelf food web, focusing on the trophic niche of D. gahi and its impacts on other species and functional groups to highlight the importance of D. gahi in the ecosystem. First, stable isotope measurements served to calculate trophic levels based on an established nitrogen baseline. Second, an Ecopath model was built to corroborate trophic levels derived from stable isotopes and inform about trophic interactions of D. gahi with other functional groups. The results of both methods placed D. gahi in the centre of the ecosystem with a trophic level of ~ 3. The Ecopath model predicted high impacts and therefore a high keystoneness for both seasonal cohorts of D. gahi. Our results show that the Falkland Shelf is not only controlled by species feeding at the top and the bottom of the trophic chain. The importance of species feeding at the third trophic level (e.g. D. gahi and Patagonotothen ramsayi) and observed architecture of energy flows confirm the ecosystem's wasp-waist structure with middle-out control mechanisms at play.

福克兰大陆架是西南大西洋的一个高产生态系统。它以上升流海洋动力学为特征，呈黄蜂腰结构，中间营养级物种很少，但有许多顶级捕食者在大陆架上迁徙觅食。其中一种常驻的中间营养级物种--巴塔哥尼亚长鳍鱿 Doryteuthis gahi 数量丰富，在生态系统中发挥着重要作用。我们采用两种方法来估算福克兰大陆架食物网的营养结构，重点关注 D. gahi 的营养生态位及其对其他物种和功能群的影响，以突出 D. gahi 在生态系统中的重要性。首先，稳定同位素测量有助于根据已确定的氮基线计算营养级。其次，建立生态病理学模型来证实稳定同位素得出的营养水平，并了解 D. gahi 与其他功能群的营养相互作用。这两种方法的结果都将 D. gahi 置于生态系统的中心，其营养级约为 3。生态病理学模型预测 D. gahi 的两个季节组群都会受到较大影响，因此具有较高的关键性。我们的研究结果表明，福克兰大陆架不仅受营养链顶层和底层摄食物种的控制。在第三营养级摄食的物种（如 D. gahi 和 Patagonotothen ramsayi）的重要性和观察到的能量流结构证实了生态系统的黄蜂腰结构，其中间控制机制在起作用。

{"title":"Unveiling the wasp-waist structure of the Falkland shelf ecosystem: the role of Doryteuthis gahi as a keystone species and its trophic influences","authors":"Tobias Büring, Jesse van Der Grient, Graham Pierce, Paco Bustamante, Marco Scotti, Jessica B. Jones, Francisco Rocha, Alexander Arkhipkin","doi":"10.1017/s0025315423000887","DOIUrl":"https://doi.org/10.1017/s0025315423000887","url":null,"abstract":"The Falkland Shelf is a highly productive ecosystem in the Southwest Atlantic Ocean. It is characterized by upwelling oceanographic dynamics and displays a wasp-waist structure, with few intermediate trophic-level species and many top predators that migrate on the shelf for feeding. One of these resident intermediate trophic-level species, the Patagonian longfin-squid Doryteuthis gahi, is abundant and plays an important role in the ecosystem. We used two methods to estimate the trophic structure of the Falkland Shelf food web, focusing on the trophic niche of D. gahi and its impacts on other species and functional groups to highlight the importance of D. gahi in the ecosystem. First, stable isotope measurements served to calculate trophic levels based on an established nitrogen baseline. Second, an Ecopath model was built to corroborate trophic levels derived from stable isotopes and inform about trophic interactions of D. gahi with other functional groups. The results of both methods placed D. gahi in the centre of the ecosystem with a trophic level of ~ 3. The Ecopath model predicted high impacts and therefore a high keystoneness for both seasonal cohorts of D. gahi. Our results show that the Falkland Shelf is not only controlled by species feeding at the top and the bottom of the trophic chain. The importance of species feeding at the third trophic level (e.g. D. gahi and Patagonotothen ramsayi) and observed architecture of energy flows confirm the ecosystem's wasp-waist structure with middle-out control mechanisms at play.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Range extension of invasive Cancer irroratus and native Carcinus maenas polewards in the Ascophyllum-dominated intertidal zone in north-west Iceland 在冰岛西北部以叶绿藻为主的潮间带，外来入侵的巨蟹（Cancer irroratus）和本地巨蟹（Carcinus maenas）的范围向极地扩展

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2024-02-12 DOI: 10.1017/s0025315423000905

Jón T. Magnússon, Stephen J. Hawkins, Lilja Gunnarsdóttir, Jörundur Svavarsson, Karl Gunnarsson

The rocky intertidal zone of sheltered shores in Breiðafjörður, north-west Iceland is dominated by monospecific stands of canopy-forming brown algae Ascophyllum nodosum, which provide habitat for mobile organisms and has been subjected to long-standing rotational harvesting. We investigated the assemblage composition of little-studied mobile brachyuran crabs in this area, to track distributional shifts in a native species responding to climate change and extent of occupancy of the intertidal by a primarily subtidal invasive non-native species. Potential interactive effects of seaweed harvesting were explored. Breiðafjörður was compared with two reference sites in Faxaflói, south-west Iceland. The study revealed clear poleward expansion of the native European green crab Carcinus maenas in the region, displacing the native spider crab Hyas araneus particularly at mid-shore levels. The invasive non-native Atlantic rock crab Cancer irroratus had negligible occupancy in the intertidal zone, indicating limited effects on the intertidal crab assemblage, composition, and abundance. The current harvesting regime of A. nodosum in Breiðafjörður did not affect the composition and abundance of the brachyuran crab assemblage in the rocky intertidal zone. H. araneus is likely being squeezed by displacement subtidally by C. irroratus, and intertidally by C. maenas. Overall, we provide insights into the potential interactions between climate change, invasive species, and human activities in the rocky intertidal zone.

冰岛西北部布雷达夫约瑟尔（Breiðafjörður）遮蔽海岸的岩石潮间带主要生长着单一的冠层褐藻（Ascophyllum nodosum），它们为移动生物提供了栖息地，并长期受到轮伐。我们调查了这一地区鲜有研究的移动腕足蟹的组合组成，以追踪本地物种应对气候变化的分布变化，以及潮间带主要被潮下带入侵非本地物种占据的程度。研究还探讨了海藻捕捞可能产生的交互影响。将 Breiðafjörður 与冰岛西南部 Faxaflói 的两个参考地点进行了比较。研究结果显示，该地区的原生欧洲青蟹 Carcinus maenas 明显向极地扩展，尤其是在中层海岸取代了原生蜘蛛蟹 Hyas araneus。入侵的非本地大西洋岩蟹（Cancer irroratus）在潮间带的占有率微乎其微，表明其对潮间带蟹类的组合、组成和丰度影响有限。目前在 Breiðafjörður 捕捞 A. nodosum 的制度并不影响潮间带岩石区腕足动物蟹群的组成和数量。H.araneus可能受到了C. irroratus在潮下和潮间带的挤压。总之，我们对潮间带岩石区气候变化、入侵物种和人类活动之间的潜在相互作用提供了深入的见解。

{"title":"Range extension of invasive Cancer irroratus and native Carcinus maenas polewards in the Ascophyllum-dominated intertidal zone in north-west Iceland","authors":"Jón T. Magnússon, Stephen J. Hawkins, Lilja Gunnarsdóttir, Jörundur Svavarsson, Karl Gunnarsson","doi":"10.1017/s0025315423000905","DOIUrl":"https://doi.org/10.1017/s0025315423000905","url":null,"abstract":"The rocky intertidal zone of sheltered shores in Breiðafjörður, north-west Iceland is dominated by monospecific stands of canopy-forming brown algae Ascophyllum nodosum, which provide habitat for mobile organisms and has been subjected to long-standing rotational harvesting. We investigated the assemblage composition of little-studied mobile brachyuran crabs in this area, to track distributional shifts in a native species responding to climate change and extent of occupancy of the intertidal by a primarily subtidal invasive non-native species. Potential interactive effects of seaweed harvesting were explored. Breiðafjörður was compared with two reference sites in Faxaflói, south-west Iceland. The study revealed clear poleward expansion of the native European green crab Carcinus maenas in the region, displacing the native spider crab Hyas araneus particularly at mid-shore levels. The invasive non-native Atlantic rock crab Cancer irroratus had negligible occupancy in the intertidal zone, indicating limited effects on the intertidal crab assemblage, composition, and abundance. The current harvesting regime of A. nodosum in Breiðafjörður did not affect the composition and abundance of the brachyuran crab assemblage in the rocky intertidal zone. H. araneus is likely being squeezed by displacement subtidally by C. irroratus, and intertidally by C. maenas. Overall, we provide insights into the potential interactions between climate change, invasive species, and human activities in the rocky intertidal zone.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2024-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139758159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Meristoderes zmaj sp. n., a new species of Kinorhyncha (Cyclorhagida: Echinoderidae) from the Adriatic Sea Meristoderes zmaj sp.

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2024-01-09 DOI: 10.1017/s0025315423000875

Alberto González-Casarrubios, Nuria Sánchez, Diego Cepeda, Fernando Pardos

A new species of the cyclorhagid genus Meristoderes is described. Meristoderes zmaj sp. n. is distinguished from its congeners by its unique arrangement of spines and tubes. It possesses acicular spines on segments 4, 6 and 8 in middorsal position and on segments 6–9 in lateroventral position; and tubes on segment 2 in subdorsal, midlateral and ventrolateral position, on segment 5 in lateroventral position and on segment 10 in laterodorsal position. With the formal description of M. zmaj sp. n., the number of species within the genus is increased to 10. In addition, the appearance of a new species and its accompanying fauna within the North-Eastern Adriatic Sea fauna, extensively studied by Kinorhyncha taxonomists, is discussed.

本文描述了一种新的旋毛虫属 Meristoderes。Meristoderes zmaj sp. n. 与同属物种的区别在于其独特的刺和管状排列。它的第 4、6 和 8 节的中背位置以及第 6-9 节的腹侧位置都有针状刺；第 2 节的背下、中侧和腹侧位置、第 5 节的腹侧位置以及第 10 节的背侧位置都有管。随着 M. zmaj sp. n. 的正式描述，该属的物种数量增加到 10 个。此外，还讨论了在亚得里亚海东北部动物群中出现的一个新物种及其伴生动物群，该动物群已被 Kinorhyncha 分类学家广泛研究。

引用次数: 0

Opportunistic observation effort and seasonal-spatial fidelity: a qualitative approach, applied to an Orcinus orca first record 机会性观测努力和季节-空间保真度：一种定性方法，适用于虎鲸的首次记录

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2023-12-27 DOI: 10.1017/s002531542300084x

Guy E. Melville

This study formulates a qualitative image-based approach to establishing cetacean sightings’ effort at an ecosystem scale in the Gulf of Maine. As a first step, I investigate a rare set of long-term sightings (2008–2017, the study period) of a male killer whale (Orcinus orca) representing unusually consistent occurrences, without considering observation effort. Largely unknown, killer whale populations in the NW Atlantic are tiny, travelling over vast areas, and at risk of human-caused extinction. The synthesis uses opportunistic observations, reported mainly by recreational mariners and commercial fishers incorporated into data manipulations anonymously. Adding an effort index using the qualitative image-based approach, I then investigate the hypothesis that the killer whale sightings constitute seasonal-spatial fidelity to the greater GoM, the first documentation of fidelity patterns in the western Atlantic hemisphere. The analysis includes comparisons to frequency distributions of single killer whales in the gulf in the historical past as a baseline, i.e. post mid 1940s. Finally, the fidelity analysis reveals a substantial spatial anomaly in the recent sightings data for the northeastern GoM. An explanation for the emergent anomaly is pursued by analyses of indicators of the availability of Atlantic herring (Clupea harengus) [fisheries landings, Atlantic puffin (Fratercula arctica) chick diets] as potential prey in the NE gulf. With the development of complementary corroborative approaches to the analysis of incidental sightings, it is possible to chip away at impediments to the understanding of ecosystem attractants and deterrents with respect to cetacean distributions.

本研究提出了一种基于图像的定性方法，用于确定缅因湾生态系统尺度上鲸目动物的观测强度。作为第一步，我调查了一组罕见的雄性虎鲸（虎鲸）长期目击事件（2008-2017 年，研究期间），这些目击事件代表了异常一致的发生率，但不考虑观测工作。西北大西洋的虎鲸种群数量极少，分布在广阔的区域，濒临人类造成的灭绝。本综合报告使用了主要由休闲航海者和商业捕鱼者匿名报告的机会性观测数据。然后，我使用基于定性图像的方法添加了一个努力指数，研究了虎鲸目击构成对大地中海的季节性空间保真度的假设，这是在西大西洋半球首次记录保真度模式。分析包括与历史上（即 20 世纪 40 年代中期以后）海湾中单头虎鲸的频率分布作为基线进行比较。最后，保真度分析揭示了最近发现的东北部海湾虎鲸数据在空间上的巨大异常。通过分析东北海湾潜在猎物大西洋鲱鱼（Clupea harengus）[渔业上岸量、大西洋海雀（Fratercula arctica）雏鸟食物]的可用性指标，对出现的异常现象进行了解释。随着偶然目击分析的互补确证方法的发展，有可能消除了解鲸目动物分布的生态系统吸引因素和威慑因素的障碍。

{"title":"Opportunistic observation effort and seasonal-spatial fidelity: a qualitative approach, applied to an Orcinus orca first record","authors":"Guy E. Melville","doi":"10.1017/s002531542300084x","DOIUrl":"https://doi.org/10.1017/s002531542300084x","url":null,"abstract":"This study formulates a qualitative image-based approach to establishing cetacean sightings’ effort at an ecosystem scale in the Gulf of Maine. As a first step, I investigate a rare set of long-term sightings (2008–2017, the study period) of a male killer whale (Orcinus orca) representing unusually consistent occurrences, without considering observation effort. Largely unknown, killer whale populations in the NW Atlantic are tiny, travelling over vast areas, and at risk of human-caused extinction. The synthesis uses opportunistic observations, reported mainly by recreational mariners and commercial fishers incorporated into data manipulations anonymously. Adding an effort index using the qualitative image-based approach, I then investigate the hypothesis that the killer whale sightings constitute seasonal-spatial fidelity to the greater GoM, the first documentation of fidelity patterns in the western Atlantic hemisphere. The analysis includes comparisons to frequency distributions of single killer whales in the gulf in the historical past as a baseline, i.e. post mid 1940s. Finally, the fidelity analysis reveals a substantial spatial anomaly in the recent sightings data for the northeastern GoM. An explanation for the emergent anomaly is pursued by analyses of indicators of the availability of Atlantic herring (Clupea harengus) [fisheries landings, Atlantic puffin (Fratercula arctica) chick diets] as potential prey in the NE gulf. With the development of complementary corroborative approaches to the analysis of incidental sightings, it is possible to chip away at impediments to the understanding of ecosystem attractants and deterrents with respect to cetacean distributions.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139051161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

First record of Warren's sixgill sawshark Pliotrema warreni (Pristiophoriformes: Pristiophoridae) and the West African catshark Scyliorhinus cervigoni (Carcharhiniformes: Scyliorhinidae) in Namibia, and notes on the habitat of the bull shark Carcharhinus leucas (Carcharhiniformes: Carcharhinidae) 在纳米比亚首次记录到沃伦六鳃锯鲨 Pliotrema warreni (Pristiophoriformes: Pristiophoridae) 和西非鲶鲨 Scyliorhinus cervigoni (Carcharhiniformes: Scyliorhinidae)，并记录到牛鲨 Carcharhinus leucas (Carcharhiniformes: Carcharhinidae) 的栖息地情况

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2023-12-21 DOI: 10.1017/s0025315423000899

Ruth H. Leeney, David A. Ebert, Kolette Grobler

Warren's sixgill sawshark, Pliotrema warreni, is confirmed for the first time in Namibian waters, from two specimens. One specimen was collected by fisheries observers on a vessel fishing in southern Namibian waters in March 2010. The other was found dead on a beach in central coastal Namibia, in August 2014. The West African catshark, Scyliorhinus cervigoni, is documented for the first time in northern Namibia, from a specimen recorded during surveys of chondrichthyan bycatch on a commercial bottom trawler. This extends the species' range southwards from Angola. Records of bull sharks Carcharhinus leucas are also documented, providing a better understanding of their distribution in Namibia. Several anglers have reported catching bull sharks in the Kunene River (from the riverbank on the Namibian side) and just south of the river mouth, along the Namibian coast.

沃伦的六鳃锯鲨（Pliotrema warreni）首次在纳米比亚水域被证实，它来自两个标本。其中一个标本是渔业观察员于 2010 年 3 月在纳米比亚南部水域的一艘捕鱼船上采集到的。另一个标本于 2014 年 8 月被发现死在纳米比亚中部沿海的海滩上。西非鲶鲨（Scyliorhinus cervigoni）首次出现在纳米比亚北部，其标本是在一艘商业底拖网渔船上调查软骨鱼类副渔获物时记录的。这将该物种的分布范围从安哥拉向南扩展。还记录了公牛鲨（Carcharhinus leucas），使人们对其在纳米比亚的分布有了更好的了解。据一些垂钓者报告，他们在库内内河（从纳米比亚一侧的河岸）和河口以南的纳米比亚海岸捕获了公牛鲨。

{"title":"First record of Warren's sixgill sawshark Pliotrema warreni (Pristiophoriformes: Pristiophoridae) and the West African catshark Scyliorhinus cervigoni (Carcharhiniformes: Scyliorhinidae) in Namibia, and notes on the habitat of the bull shark Carcharhinus leucas (Carcharhiniformes: Carcharhinidae)","authors":"Ruth H. Leeney, David A. Ebert, Kolette Grobler","doi":"10.1017/s0025315423000899","DOIUrl":"https://doi.org/10.1017/s0025315423000899","url":null,"abstract":"Warren's sixgill sawshark, Pliotrema warreni, is confirmed for the first time in Namibian waters, from two specimens. One specimen was collected by fisheries observers on a vessel fishing in southern Namibian waters in March 2010. The other was found dead on a beach in central coastal Namibia, in August 2014. The West African catshark, Scyliorhinus cervigoni, is documented for the first time in northern Namibia, from a specimen recorded during surveys of chondrichthyan bycatch on a commercial bottom trawler. This extends the species' range southwards from Angola. Records of bull sharks Carcharhinus leucas are also documented, providing a better understanding of their distribution in Namibia. Several anglers have reported catching bull sharks in the Kunene River (from the riverbank on the Namibian side) and just south of the river mouth, along the Namibian coast.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138824816","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feeding ecology of the shortfin mako shark, Isurus oxyrinchus, in the Ecuadorian Pacific Ocean 厄瓜多尔太平洋短吻鲭鲨的摄食生态学

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2023-12-21 DOI: 10.1017/s0025315423000863

Marcos D. Calle-Morán, Héctor M. Erazo-Garcés, Ana R. Hernández-Téllez, Felipe Galván-Magaña, Colombo Estupiñán-Montaño

Shortfin mako shark, Isurus oxyrinchus, is listed as an endangered species with declining global population. Thus, studies regarding its biology and ecology are important to recommend fishery management and conservation measures. This study aimed to determine the diet composition and feeding habits of I. oxyrinchus in Ecuadorian waters. Samples were obtained from Santa Rosa fishing port (Ecuador). The total length (LT), sex and sexual characteristics were recorded, and stomach contents were collected. A total of 142 individuals were recorded, comprising 81 females (104–295 cm LT) and 61 males (127–245 cm LT). A total of 24 prey species were identified, including crustaceans, cephalopods, teleosts and cetaceans. According to the Prey-Specific Index of Relative Importance (PSIRI), the main prey taxa were the ommastrephid squid, Dosidicus gigas (42.57%) and Sthenoteuthis oualaniensis (21.04%), followed by fish from the family Hemiramphidae (11.85%). Isurus oxyrinchus is a specialist predator that preferred a low number of prey (Bi = 0.25), both by sex (Bi; females = 0.29 and males = 0.34) and life stages (Bi; juveniles = 0.27 and adults = 0.37). The trophic overlap was medium for sexes (J = 0.54) and biological cycle phases (J = 0.42). Trophic level (TLk) was 4.47, indicating that I. oxyrinchus is a tertiary predator. This information will help in fisheries management based on an ecosystem approach, where this species fulfils an ecological role, and its interactions with other species allow us to understand how the flow of nutrients and energy occurs within an ecosystem.

短吻鲭鲨被列为濒危物种，全球数量正在下降。因此，对其生物学和生态学的研究对于提出渔业管理和保护措施非常重要。本研究旨在确定厄瓜多尔水域鳕鱼的食物组成和摄食习惯。样本取自圣罗莎渔港（厄瓜多尔）。记录了总长度（LT）、性别和性特征，并收集了胃内容物。共记录了 142 条个体，包括 81 条雌性个体（体长 104-295 厘米）和 61 条雄性个体（体长 127-245 厘米）。共鉴定出 24 种猎物，包括甲壳类、头足类、远足类和鲸类。根据猎物相对重要性指数（PSIRI），主要的猎物类群是大鳞鱿鱼（Dosidicus gigas，42.57%）和大鳞鱿鱼（Sthenoteuthis oualaniensis，21.04%），其次是鱵科鱼类（Hemiramphidae，11.85%）。牛尾鳅是一种专性捕食者，喜欢的猎物数量较少（Bi = 0.25），性别（Bi；雌性 = 0.29，雄性 = 0.34）和生命阶段（Bi；幼鱼 = 0.27，成鱼 = 0.37）均是如此。性别（J = 0.54）和生物周期阶段（J = 0.42）的营养级重叠度为中等。营养级（TLk）为 4.47，表明 I. oxyrinchus 为三级捕食者。这些信息将有助于基于生态系统方法的渔业管理，该物种在其中发挥着生态作用，它与其他物种的相互作用使我们能够了解生态系统中营养物质和能量的流动情况。

{"title":"Feeding ecology of the shortfin mako shark, Isurus oxyrinchus, in the Ecuadorian Pacific Ocean","authors":"Marcos D. Calle-Morán, Héctor M. Erazo-Garcés, Ana R. Hernández-Téllez, Felipe Galván-Magaña, Colombo Estupiñán-Montaño","doi":"10.1017/s0025315423000863","DOIUrl":"https://doi.org/10.1017/s0025315423000863","url":null,"abstract":"Shortfin mako shark, Isurus oxyrinchus, is listed as an endangered species with declining global population. Thus, studies regarding its biology and ecology are important to recommend fishery management and conservation measures. This study aimed to determine the diet composition and feeding habits of I. oxyrinchus in Ecuadorian waters. Samples were obtained from Santa Rosa fishing port (Ecuador). The total length (LT), sex and sexual characteristics were recorded, and stomach contents were collected. A total of 142 individuals were recorded, comprising 81 females (104–295 cm LT) and 61 males (127–245 cm LT). A total of 24 prey species were identified, including crustaceans, cephalopods, teleosts and cetaceans. According to the Prey-Specific Index of Relative Importance (PSIRI), the main prey taxa were the ommastrephid squid, Dosidicus gigas (42.57%) and Sthenoteuthis oualaniensis (21.04%), followed by fish from the family Hemiramphidae (11.85%). Isurus oxyrinchus is a specialist predator that preferred a low number of prey (Bi = 0.25), both by sex (Bi; females = 0.29 and males = 0.34) and life stages (Bi; juveniles = 0.27 and adults = 0.37). The trophic overlap was medium for sexes (J = 0.54) and biological cycle phases (J = 0.42). Trophic level (TLk) was 4.47, indicating that I. oxyrinchus is a tertiary predator. This information will help in fisheries management based on an ecosystem approach, where this species fulfils an ecological role, and its interactions with other species allow us to understand how the flow of nutrients and energy occurs within an ecosystem.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138824622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An updated checklist of Stomiiformes from Indian waters with nine new records 印度水域蝶形目最新核对表及 9 项新记录

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2023-12-11 DOI: 10.1017/s0025315423000838

Rajeev Rajakrishnan, Meleppura Rajeeshkumar, Sherine Sonia Cubelio, Narayanane Saravanane

Over the years as a part of many fishery surveys, considerable number of stomiiform fishes were collected by the Centre for Marine Living Resources and Ecology (CMLRE) Research Vessel ‘Sagar Sampada’. The collection came from throughout the Indian EEZ and some from the western Indian Ocean. However, a systematic identification of these fishes had never been carried out prior to this paper. Thirty-four species were identified and it was found that eight species were new records to India and one to peninsular India. Among the records, two species, Photonectes paxtoni Flynn and Klepadlo, 2012 and Photonectes barnetti Klepadlo, 2011, are collected from the Indian Ocean for the first time. The paper provides a detailed report on all the new records and a list of stomiiform species collected during these surveys. Differences in barbel morphology observed for many of the stomiids are discussed.

多年来，作为许多渔业调查的一部分，海洋生物资源和生态中心（CMLRE）的研究船 "Sagar Sampada "号收集了大量的匍匐鱼类。收集的鱼类来自整个印度专属经济区，有些来自西印度洋。然而，在本文发表之前，从未对这些鱼类进行过系统的鉴定。经鉴定，有 34 个鱼种，其中 8 个鱼种是印度的新记录，1 个是印度半岛的新记录。其中，Photonectes paxtoni Flynn and Klepadlo, 2012 和 Photonectes barnetti Klepadlo, 2011 这两个物种是首次从印度洋采集到的。本文详细报告了所有新记录，以及在这些调查中收集到的栉水母物种清单。文中还讨论了在许多栉水母中观察到的栉水母形态差异。

引用次数: 0

Latitudinal shift of the associated hosts in Sagamiscintilla thalassemicola (Galeommatoidea: Galeommatidae), a rare ectosymbiotic bivalve that lives on the proboscis of echiuran worms 一种罕见的寄生在蚓喙上的外共生双壳类动物Sagamiscintilla thalassemicola (Galeommatoidea: galeomatidae)中伴生寄主的纬度变化

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2023-12-06 DOI: 10.1017/s0025315423000772

Ryutaro Goto, Taigi Sato, Hiroki Nakajima, Takahiro Sugiyama, Hiroshi Ishikawa

Sagamiscintilla thalassemicola (Bivalvia: Galeommatoidea: Galeommatidae) is a rare ectocommensal bivalve that lives on the proboscis of echiuran worms, Anelassorhynchus spp. (Annelida: Thalassematidae: Thalassematinae: Thalassematini), and has been known only from the temperate zones of Japan. In this study, we found S. thalassemicola on the proboscis of the large echiuran Ochetostoma sp. (Thalassematidae: Thalassematinae: Thalassematini) on intertidal flats of three islands of the Ryukyu Archipelago, southern Japan. These are the first records of S. thalassemicola on non-Anelassorhynchus hosts and also from the subtropical regions. Additionally, we also collected S. thalassemicola from an intertidal flat of Kushimoto, Wakayama, Kii Peninsula, Japan, which is an update of the easternmost record of this species. The genetic differences in the mitochondrial cytochrome c oxidase subunit I and nuclear internal transcribed spacer 2 genes among S. thalassemicola, including those with Ochetostoma sp. from the subtropical region and with Anelassorhynchus spp. from the temperate region, can be considered within the intraspecific variation. These suggest that S. thalassemicola uses different echiuran hosts in the temperate and subtropical regions, respectively.

双壳纲:海壳纲:海壳纲:海壳纲:海壳纲)是一种罕见的外共生双壳类动物，生活在棘球线虫的喙部(环节纲:海壳纲:海壳纲:海壳纲)，仅在日本温带地区发现。本研究在日本南部琉球群岛3个岛屿的潮间带滩涂上发现了大型潮尾动物Ochetostoma sp.(海尾纲:海尾纲:海尾纲:海尾纲)喙部的S. thalassemicola。这是在亚热带地区首次发现的非类人猿寄主上发现的地中海粘虫。此外，我们还在日本喜井半岛和歌山Kushimoto潮间带采集到了S. thalassemicola，这是该物种最东端记录的更新。地中海沙蚤(S. thalassemicola)线粒体细胞色素c氧化酶亚基I和核内转录间隔基因2的遗传差异，包括与亚热带Ochetostoma sp.和温带Anelassorhynchus sp.的遗传差异，可以认为是种内变异。这些结果表明，地中海沙门氏菌在温带和亚热带地区分别利用不同的蚓类寄主。

{"title":"Latitudinal shift of the associated hosts in Sagamiscintilla thalassemicola (Galeommatoidea: Galeommatidae), a rare ectosymbiotic bivalve that lives on the proboscis of echiuran worms","authors":"Ryutaro Goto, Taigi Sato, Hiroki Nakajima, Takahiro Sugiyama, Hiroshi Ishikawa","doi":"10.1017/s0025315423000772","DOIUrl":"https://doi.org/10.1017/s0025315423000772","url":null,"abstract":"Sagamiscintilla thalassemicola (Bivalvia: Galeommatoidea: Galeommatidae) is a rare ectocommensal bivalve that lives on the proboscis of echiuran worms, Anelassorhynchus spp. (Annelida: Thalassematidae: Thalassematinae: Thalassematini), and has been known only from the temperate zones of Japan. In this study, we found S. thalassemicola on the proboscis of the large echiuran Ochetostoma sp. (Thalassematidae: Thalassematinae: Thalassematini) on intertidal flats of three islands of the Ryukyu Archipelago, southern Japan. These are the first records of S. thalassemicola on non-Anelassorhynchus hosts and also from the subtropical regions. Additionally, we also collected S. thalassemicola from an intertidal flat of Kushimoto, Wakayama, Kii Peninsula, Japan, which is an update of the easternmost record of this species. The genetic differences in the mitochondrial cytochrome c oxidase subunit I and nuclear internal transcribed spacer 2 genes among S. thalassemicola, including those with Ochetostoma sp. from the subtropical region and with Anelassorhynchus spp. from the temperate region, can be considered within the intraspecific variation. These suggest that S. thalassemicola uses different echiuran hosts in the temperate and subtropical regions, respectively.","PeriodicalId":17477,"journal":{"name":"Journal of the Marine Biological Association of the United Kingdom","volume":null,"pages":null},"PeriodicalIF":1.2,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138512060","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The first validated record of Epinephelus areolatus (Forsskål, 1775) (Perciformes: Serranidae) from Syrian marine waters 叙利亚海域首个经证实的石斑鱼(forsskatal, 1775)(鲈形目:鲈科)

IF 1.2 4区生物学 Q2 Agricultural and Biological Sciences

Journal of the Marine Biological Association of the United Kingdom

Pub Date : 2023-11-28 DOI: 10.1017/s0025315423000814

Mohamad Hassan, Alaa Alchikh Ahmad

Here, we report the first validated record of the non-indigenous grouper species Epinephelus areolatus (Perciformes: Serranidae) along the Mediterranean coast of Syria. A single specimen of E. areolatus (Forsskål, 1775), was found on 29 September 2021 during a recurrent ichthyological survey, in a rocky habitat from the Mediterranean coast of Syria. This represents the first confirmed record of this species, native to the Red Sea, for the Syrian waters and the fourth for the Mediterranean Sea. The present record fills the gap with species distribution along the eastern Mediterranean and provides further evidence that the environmental alterations due to the combination of human activities and climate change render the Mediterranean waters increasingly likely to accommodate tropical species, possibly at the expense of the native ones.

在这里，我们报告了叙利亚地中海沿岸非本地石斑鱼物种Epinephelus areolatus(鲈形目:Serranidae)的第一个有效记录。2021年9月29日，在叙利亚地中海沿岸的一个岩石栖息地进行反复鱼类学调查时，发现了一具E. areolatus (forsskatal, 1775)标本。这是该物种的第一次确认记录，原产于红海，叙利亚水域和地中海的第四次记录。目前的记录填补了地中海东部物种分布的空白，并提供了进一步的证据，证明人类活动和气候变化共同导致的环境变化使地中海水域越来越有可能容纳热带物种，可能以牺牲本地物种为代价。

引用次数: 0