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Large branchiopods (Anostraca, Notostraca, Laevicaudata, Spinicaudata) from the semi-arid regions of western India 印度西部半干旱地区的大型枝足类动物(Anostraca、Notostraca、Laevicaudata、Spinicaudata
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-09-15 DOI: 10.1093/jcbiol/ruae050
Avinash Isaac Vanjare, Prashant Manohar Katke, Sameer M Padhye
Large branchiopod crustaceans are flagship species of temporary water bodies, especially in arid and semi-arid regions. Less information is available about the large branchiopods of tropical Asia compared to other parts of the world such as the Americas. To reduce this disparity, we surveyed large branchiopods from the semi-arid region of Maharashtra state, India. Sampling at 29 sites over four years revealed nine species representing four orders. This is the highest diversity ever reported from a single regional study in India. Anostracans were the most commonly occurring group, whereas the spinicaudatans Leptestheria cf. nobilisSars, 1900, L. jaisalmerensisTiwari, 1962, and Eulimnadia michaeliNayar & Nair, 1968 were very rare. Leptestheria jaisalmerensis had been known previously only from its type locality nearly 1,200 km north of our study region. Congeneric assemblages of the anostracans Streptocephalus dichotomusBaird, 1860 + S. simplexGurney, 1906 and the spinicaudatans Leptestheria cf. nobilis + L. jaisalmerensis were collected. Temporary aquatic habitats are threatened due to adverse anthropogenic activities, especially in developing countries like India. The endemic species of large branchiopods in the Indian subcontinent should be red-listed, as is done elsewhere.
大型枝足类甲壳动物是临时水体的旗舰物种,尤其是在干旱和半干旱地区。与美洲等世界其他地区相比,有关亚洲热带地区大型甲壳动物的资料较少。为了缩小这一差距,我们调查了印度马哈拉施特拉邦半干旱地区的大型枝脚类动物。经过四年在 29 个地点的取样,我们发现了代表四个目的九个物种。这是迄今为止在印度进行的单一地区研究中发现的最高多样性。梭形目动物是最常出现的类群,而刺尾目动物 Leptestheria cf. nobilisSars, 1900、L. jaisalmerensisTiwari, 1962 和 Eulimnadia michaeliNayar & Nair, 1968 则非常罕见。Leptestheria jaisalmerensis 以前仅在我们研究地区以北近 1 200 公里处的模式产地为人所知。我们还收集到了梭鱼 Streptocephalus dichotomusBaird, 1860 + S. simplexGurney, 1906 和刺鱼 Leptestheria cf. nobilis + L. jaisalmerensis 的同属组合。由于不利的人类活动,特别是在印度等发展中国家,临时水生生境受到威胁。应像其他地方一样,将印度次大陆特有的大型枝足类物种列入红色名录。
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引用次数: 0
Sustainable aquaculture of West African freshwater prawns Macrobrachium vollenhovenii (Herklots, 1857) and M. macrobrachion (Herklots, 1851) (Decapoda: Caridea: Palaemonidae) 西非淡水对虾Macrobrachium vollenhovenii (Herklots, 1857) and M. macrobrachion (Herklots, 1851) (Decapoda: Caridea: Palaemonidae)的可持续水产养殖
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-09-15 DOI: 10.1093/jcbiol/ruae052
Riyad Taguemount
The river prawn Macrobrachium vollenhovenii (Herklots, 1857) and the brackish river prawn M. macrobrachion (Herklots, 1851) are economically and ecologically significant West African species. Recent molecular studies suggest they might be different ecotypes of the same species, complicating taxonomy and sustainable aquaculture practices. Both species face significant threats from human exploitation, leading to high exploitation rates and smaller average sizes within populations. Seasonal variations affect their abundance, with M. macrobrachion more prevalent during the rainy season and M. vollenhovenii thriving in the dry season. Their omnivorous detritivorous feeding habits involve consuming detritus, diatoms, phytoplankton, and insect larvae during juvenile stages. Aquaculture of M. vollenhovenii and M. macrobrachion encounters difficulties such as limited hatchery technology and low larval survival rates. Efforts to cultivate juveniles or adults in captivity face obstacles like high mortality rates due to moulting stress, handling, feeding, and cannibalism. Reintroducing captive-bred prawns into the wild offers dual benefits: controlling snail populations that host parasite causing schistosomiasis and restoring ecological balance while enhancing local fisheries and providing socio-economic benefits. To achieve sustainable aquaculture, it is crucial to address taxonomic complexities, implement management measures to mitigate overexploitation, improve hatchery technology, optimise feeding strategies, reduce stress during moulting and handling, and engage local communities through capacity building and awareness programs. This review aims to contribute to a better understanding of these prawns, promoting informed decision-making for sustainable management, conservation, and socio-economic benefits in West Africa.
河对虾Macrobrachium vollenhovenii(Herklots,1857年)和咸水河对虾M. macrobrachion(Herklots,1851年)是西非具有重要经济和生态意义的物种。最近的分子研究表明,它们可能是同一物种的不同生态型,从而使分类和可持续水产养殖变得更加复杂。这两个物种都面临着人类开发的巨大威胁,导致开发率高,种群平均规模较小。季节性变化会影响它们的丰度,M. macrobrachion在雨季更为普遍,而M. vollenhovenii则在旱季兴旺。它们的杂食性碎屑取食习性包括在幼鱼阶段食用碎屑、硅藻、浮游植物和昆虫幼虫。水产养殖大菱鲆和小菱鲆遇到了孵化技术有限、幼体存活率低等困难。人工养殖幼体或成体的努力面临着各种障碍,如蜕皮压力、处理、喂食和食人导致的高死亡率。将人工繁殖的对虾重新引入野外有双重好处:控制寄生血吸虫病寄生虫的钉螺数量,恢复生态平衡,同时提高当地渔业水平,提供社会经济效益。要实现可持续水产养殖,关键是要解决分类的复杂性,实施管理措施以减少过度开发,改进孵化技术,优化喂养策略,减少换壳和处理过程中的压力,并通过能力建设和宣传计划让当地社区参与进来。本综述旨在帮助人们更好地了解这些对虾,促进西非在可持续管理、保护和社会经济效益方面做出明智的决策。
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引用次数: 0
The only terrestrial lineage in the Branchiopoda redefined: a new species of Bryospilus Frey, 1980 (Cladocera: Anomopoda) from India and adaptations of waterfleas to life on land 重新定义蝶形目中唯一的陆生品系:印度的一个新物种 Bryospilus Frey, 1980 (Cladocera: Anomopoda) 以及水蚤对陆地生活的适应性
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-09-07 DOI: 10.1093/jcbiol/ruae054
Kay Van Damme, Sameer M Padhye
Only a small proportion of the world’s crustacean taxa is adapted to limno-terrestrial microhabitats that are disconnected from conventional surface waterbodies. In rare occasions, water films on terrestrial tropical and subtropical vegetation may also harbour specialised cladocerans. Bryospilus Frey, 1980 (Chydoridae) is the only genus within the class Branchiopoda that is specialised to living almost exclusively in water-saturated terrestrial moss patches, leaf litter, and phytotelms. The remarkable waterflea lineage, which has a suite of highly unusual characters within the family, has been found in terrestrial habitats in rainforests of West Africa, South and Central America, and New Zealand. We discovered a new moss-inhabiting chydorid from western India, Bryospilus (Indobryospilus) bharaticusn. sp., the first representative of the genus from the Oriental Region. Its morphology and behaviour are highly unusual for a species of Bryospilus. In comparison to its congeners, the new species can swim and it has significantly less oligomerisation, with three terminal setae on the antennal endopod instead of two and seven exopod setae on the third limb instead of six, among other features. We define a new subgenus Indobryospilusnov. and we amend the genus Bryospilus. The new species is a living evolutionary connection, characterised by a phenotype which provides us with new clues about evolutionary transitions in the only terrestrial branchiopod genus. Our results are informative beyond Cladocera, as the morphology of this species provides insights about the evolution and parallelisms of aquatic crustaceans that have specialised in limno-terrestrial habitats. We revisit the morphology of the genus, the disjunct biogeographical pattern with a potential ancient signature, and discuss the functional adaptations of these cladocerans to life on land, as well as convergences with subterranean lineages. A new key to the world species of Bryospilus species is included.
在世界甲壳动物分类群中,只有一小部分适应与传统地表水体断开的陆地微生境。在极少数情况下,热带和亚热带陆地植被上的水膜也可能蕴藏着专门的甲壳动物。Bryospilus Frey,1980 年(水蚤科)是仅有的一个专门生活在水饱和陆生苔藓斑块、落叶层和植被中的支脚类。在西非、南美洲、中美洲和新西兰的热带雨林的陆地栖息地中,发现了在该科中具有一系列非常不寻常特征的非凡的水蚤品系。我们在印度西部发现了一种栖息于苔藓中的新水螅虫--Bryospilus (Indobryospilus) bharaticusn.它的形态和行为对于 Bryospilus 的一个物种来说非常不寻常。与同属种相比,该新种可以游泳,而且寡聚化程度明显降低,触角内足的末端刚毛由两根变为三根,第三肢的外足刚毛由六根变为七根,等等。我们定义了一个新的亚属 Indobryospilusnov.,并修正了 Bryospilus 属。该新物种是一个活生生的进化联系,其表型特征为我们提供了有关唯一陆生枝足类属进化转变的新线索。我们的研究结果不仅对栉孔类动物具有参考价值,而且该物种的形态也为我们提供了有关水生甲壳类动物进化的见解,并与专门从事陆生边缘栖息地的水生甲壳类动物相似。我们重新审视了该属的形态、具有潜在远古特征的脱节生物地理格局,并讨论了这些甲壳动物对陆地生活的功能适应以及与地下品系的趋同。该研究还包括一个新的 Bryospilus 世界物种检索表。
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引用次数: 0
Sexually dimorphic characteristics and their functions in a native crab Leptochryseus kuwaitense (Jones & Clayton, 1983) (Decapoda: Brachyura: Camptandriidae) from the Persian Gulf 波斯湾本地蟹类 Leptochryseus kuwaitense (Jones & Clayton, 1983) (十足目:臂形目:蟹科)的性别二形特征及其功能
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-09-05 DOI: 10.1093/jcbiol/ruae051
Sedigh Azizi, Reza Naderloo, Mohammad Sharif Ranjbar, Adnan Shahdadi
Understanding population dynamics requires knowledge of reproductive aspects such as sexual maturity, fertility, and growth changes of body components. We analyzed the relative growth and morphometry in a native brachyuran crab, Leptochryseus kuwaitense (Jones & Clayton, 1983), that dominates mud flats along the Iranian coast of the Persian Gulf and Gulf of Oman. The carapace (length, width, height, front), pleon (abdomen) (length and width of the first, third, fifth, and sixth segments), second, third, and fourth walking legs (total length, length, and width of the merus), cheliped propodus (length and width), and eye dimentions (distance between the two eyes and eye-stalk length), and total weight were recorded for 83 specimens. A regression model with a segmented relationship was employed to examine the relative growth patterns of the characteristics in question. The breakpoints identified in the analysis provided insights into the body size at which crabs attain sexual maturity. The carapace length of sexual morphometric maturity in males and females was 20.43 mm and 19.20 mm, respectively. Males exhibited a positive allometric growth for most traits, with adults having a greater slope than juveniles with the exception of body height, weight, and in some traits (e.g., cheliped length and width) this slope is more than double. By contrast, the growth equation for females is positive allometric for the majority of traits in juveniles, whereas were negative allometric in mature individuals. Juvenile individuals of both sexes exhibited morphological similarities, but females tended to have a smaller body size compared to males. The carapace length of the largest male was 24.2 mm (with mean of 21.71 mm, N = 43), 21.7 and (with mean of 20.14 mm, N = 40) for females, a characteristic that is likely associated with their reproductive biology. Because males are larger in body size, energy investment in the growth of walking legs and chelipeds may be crucial for mating and intreasexual cambating. The rate of growth thus exhibited a more rapid increase in males. Our results indicate that the chelipeds do not play a role in combat, but the coloration of the male cheliped plays a role in its selection by females.
了解种群动态需要了解生殖方面的知识,如性成熟、繁殖力和身体各部分的生长变化。我们分析了在波斯湾伊朗海岸和阿曼湾泥滩上占主导地位的本地腕足蟹 Leptochryseus kuwaitense(Jones & Clayton, 1983)的相对生长和形态测量。记录了 83 个标本的甲壳(长、宽、高、前部)、腹部(第一、三、五和六节的长度和宽度)、第二、三和四步行腿(总长度、长度和分叉宽度)、螯足前足(长度和宽度)、眼部尺寸(两眼之间的距离和眼柄长度)和总重量。采用分段关系回归模型研究了相关特征的相对增长模式。分析中确定的断点有助于了解河蟹达到性成熟的体型。雄蟹和雌蟹性成熟时的体长分别为 20.43 毫米和 19.20 毫米。雄性在大多数性状上都表现出正的异速增长,除体高、体重外,成体的斜率大于幼体,在某些性状上(如螯长和螯宽),成体的斜率是幼体的两倍多。相比之下,雌性个体的生长方程在幼体的大多数性状上都是正异速增长,而在成熟个体上则是负异速增长。雌雄幼体的形态相似,但雌体的体型往往小于雄体。最大雄性个体的体长为24.2毫米(平均为21.71毫米,样本数=43),雌性个体的体长为21.7毫米(平均为20.14毫米,样本数=40),这可能与它们的生殖生物学特征有关。由于雄性体型较大,在步行腿和螯足生长方面的能量投资可能对交配和性内交配至关重要。因此,雄性的生长速度增长更快。我们的研究结果表明,螯足在战斗中不起作用,但雄性螯足的颜色在雌性选择雄性螯足时起了作用。
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引用次数: 0
Spatial distribution and abundance of non-native barnacles of the genus Amphibalanus Pitombo, 2004 (Cirripedia: Balanidae) in southern Iraq 伊拉克南部非本地藤壶属 Amphibalanus Pitombo,2004 年(Cirripedia: Balanidae)的空间分布和丰度
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-09-05 DOI: 10.1093/jcbiol/ruae048
Murtada D Naser, Amaal Gh Yasser, Patricio R De los Ríos-Escalante, Franz Essl
Invasions of non-native species have been occurring across the globe, mostly due to human activities or climate change. Although most introduced species fail to expand or have slight impact on their new ecosystems, the large number of true invasive species has led to serious economic and ecological problems. Knowledge of the fundamental drivers shaping the current distribution and abundance of invasive species of barnacles of the genus AmphibalanusPitombo, 2004 in Iraq are still poorly understood. We collected samples of barnacles from 21 sites from the lower reaches of the Shatt Al-Arab with salinities of 20–24 ppt to the upper part of the Shatt Al-Arab, and northwest to the Al-Hammar marshes and the Euphrates River with salinities of 0.9–2.8 ppt. Amphibalanus amphitrite (Darwin, 1854) was widely distributed, occurring at most sites. With the exception of a few sites close to the mouth of the Shatt Al-Arab, A. improvisus (Darwin, 1854) was restricted to sites with salinities of 22–37 ppt. Amphibalanus subalbidus (Henry, 1973) had an oligohaline distribution, occurring in moderately saline water. Redundancy analysis (RDA) revealed that the spatial distribution and abundance of all three species were influenced by salinity and temperature. Overall, our results confirm the importance of mapping the spatial distribution and abundance of invasive species in order to assess and manage the risks these species pose to native ecosystems.
非本地物种的入侵一直在全球范围内发生,主要是由于人类活动或气候变化造成的。虽然大多数引入物种未能扩大或对其新的生态系统产生轻微影响,但大量真正的入侵物种已导致严重的经济和生态问题。人们对 2004 年伊拉克藤壶属(Amphibalanus-Pitombo)入侵物种目前的分布和数量的基本驱动因素仍然知之甚少。我们从阿拉伯河下游(盐度为 20-24 ppt)到阿拉伯河上游(盐度为 0.9-2.8 ppt),再向西北到哈马尔沼泽和幼发拉底河的 21 个地点采集藤壶样本。Amphibalanus amphitrite(达尔文,1854 年)分布广泛,出现在大多数地点。除了靠近阿拉伯河河口的几个地点外,A. improvisus(达尔文,1854 年)仅限于盐度为 22-37 ppt 的地点。Amphibalanus subalbidus(Henry,1973 年)分布在中度盐度的水域中。冗余分析(RDA)显示,这三个物种的空间分布和丰度都受到盐度和温度的影响。总之,我们的研究结果证实了绘制入侵物种空间分布和丰度图的重要性,以便评估和管理这些物种对本地生态系统造成的风险。
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引用次数: 0
Microparasite screening across four species of decapod crustaceans (Decapoda: Brachyura, Astacidea) in Ireland 对爱尔兰的四种十足目甲壳动物(十足目:腕足动物、天体动物)进行微寄生虫筛选
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-07-18 DOI: 10.1093/jcbiol/ruae029
Signe Martin, Deborah Cheslett, Simona Georgieva, Ian O’Connor, Fiona Swords, Katie O’Dwyer
Decapod crustaceans and their associated fisheries are an important resource globally, and demand for seafood continues to grow alongside a growing human population. With a combined 2023 value of €36 million in Ireland, three species of brachyuran crabs, the velvet crab (Necora puberLinnaeus, 1767), edible crab (Cancer pagurusLinnaeus, 1758), spider crab (Maja squinado Herbst, 1788)), and the European lobster (Homarus gammarusLinnaeus, 1758) are decapods of commercial importance. These species are also important components of their respective ecosystems. Parasite infection can affect the health of crustaceans and may affect population productivity. Microparasites, including paramyxids (Hematodinium spp.) and microsporidians can infect decapod crustaceans and have a range of effects on their hosts. We assessed three microparasites in four crustacean species. Paramarteilia canceri was found in all three crab species, and we provide the first genetic confirmation in spider crabs. A microsporidian associated with cotton crab disease, Ameson sp., was identified in N. puber, along with a second species of microsporidian which will require further classification. None of the three parasite groups were identified in Homarus gammarus. Species of Hematodinium were not identified in any of the species studies. Our work highlights the need for parasite surveys to uncover parasite diversity and prevalence in crustaceans to help elucidate host-parasite interactions, and the potential impacts of parasites.
十足类甲壳动物及其相关渔业是全球重要的资源,随着人口的不断增长,对海产品的需求也持续增长。在爱尔兰,2023 年的总价值为 3,600 万欧元,三种腕足类蟹,即绒蟹(Necora puberLinnaeus,1767 年)、食用蟹(Cancer pagurusLinnaeus,1758 年)、蜘蛛蟹(Maja squinado Herbst,1788 年),以及欧洲龙虾(Homarus gammarusLinnaeus,1758 年)是具有商业重要性的十足目动物。这些物种也是各自生态系统的重要组成部分。寄生虫感染会影响甲壳类动物的健康,并可能影响种群生产力。包括副寄生虫(Hematodinium spp.)和微孢子虫在内的微寄生虫可感染十足目甲壳类动物,并对宿主产生一系列影响。我们评估了四个甲壳类物种中的三种微寄生虫。在所有三种蟹类中都发现了癌副蠕虫,我们首次在蜘蛛蟹中进行了基因确认。在 N. puber 中发现了一种与棉蟹病有关的微孢子虫 Ameson sp.,还有一种需要进一步分类的微孢子虫。这三种寄生虫都没有在伽马鼬(Homarus gammarus)中发现。在任何物种研究中都没有发现半孢子虫的种类。我们的工作突出表明,有必要进行寄生虫调查,以发现甲壳类寄生虫的多样性和流行率,从而帮助阐明宿主与寄生虫之间的相互作用以及寄生虫的潜在影响。
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引用次数: 0
Piscivory by the crabs Cancer productus Randall, 1840 and Pugettia producta (Randall, 1840) (Decapoda: Brachyura: Cancridae, Epialtidae) 蟹类 Cancer productus Randall, 1840 和 Pugettia producta (Randall, 1840) (Decapoda: Brachyura: Cancridae, Epialtidae) 的食鱼行为
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-07-17 DOI: 10.1093/jcbiol/ruae042
Gregory C Jensen
Cancer productus Randall, 1840 and Pugettia producta (Randall, 1840) have been observed in the field feeding on live teleost fishes, an unexpected behavior for the molluscivorous C. productus and the largely herbivorous P. producta. Crabs were seen employing a speculative hunting technique of pouncing on tufts of algae or open areas of sediment followed by probing with the pereopods. Such behaviors suggest that food web relationships involving crabs may be much more complex than usually assumed.
在野外观察到 Cancer productus Randall, 1840 和 Pugettia producta (Randall, 1840) 以活的箭鱼为食,这对于软体动物 C. productus 和草食性的 P. producta 来说是一种意想不到的行为。人们看到螃蟹采用了一种推测性的捕食技术,即扑向一簇簇藻类或沉积物的空旷区域,然后用桡足类进行探测。这些行为表明,涉及螃蟹的食物网关系可能比通常认为的要复杂得多。
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引用次数: 0
A new genus and species of mantis shrimp from Australia and Japan (Stomatopoda: Tetrasquillidae), with a revised diagnosis of Tetrasquillidae and a key to its genera 来自澳大利亚和日本的螳螂虾新属和新种(口足纲:Tetrasquillidae),附 Tetrasquillidae 的修订诊断及其属的一把钥匙
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-07-10 DOI: 10.1093/jcbiol/ruae038
Shane T Ahyong, Hiroki Nakajima, Tohru Naruse
A new genus and species of lysiosquilloid mantis shrimp is described from Australia and Japan. It is unique in Stomatopoda by its unusual telson ornamentation in which the short intermediate and lateral primary teeth, accompanied by a row of short, graded serrations inward of the intermediate teeth, partially overhang a row of minute submarginal denticles. Although distinctive as a new genus and species, Incertasquilla chimeragen. et sp. nov. does not fit clearly into existing lysiosquilloid families as currently diagnosed and, in some respects, shares a mosaic of features present in several families. Incertasquilla chimeragen. et sp. nov., however, currently fits best into Tetrasquillidae, where it is tentatively placed, although further phylogenetic study may show it belongs in a separate family altogether. In the light of the new character combinations presented by the discovery of Incertasquilla chimeragen. et sp. nov., a revised diagnosis for Tetrasquillidae and updated key to the genera are provided. The discovery of Incertasquilla chimeragen. et sp. nov. expands the described lysiosquilloid fauna to 14 genera and 30 species in Australia, and 10 and 16 in Japan, respectively.
该研究描述了产自澳大利亚和日本的一种新属和新种虹彩螳螂虾。它在口足纲中是独一无二的,因为它的尾柄装饰不同寻常,中间和侧边的主齿很短,中间的主齿向内有一排短而分级的锯齿,部分地悬挂着一排微小的近缘小齿。尽管作为一个新属和新种,Incertasquilla chimeragen.然而,Incertasquilla chimeragen.根据新发现的 Incertasquilla chimeragen.新发现的 Incertasquilla chimeragen.
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引用次数: 0
Temperature acclimation and response to acute thermal stress in the adults of the snow crab Chionoecetes opilio Fabricius, 1788 (Decapoda: Brachyura: Oregoniidae) 雪蟹 Chionoecetes opilio Fabricius, 1788 (Decapoda: Brachyura: Oregoniidae) 成体的温度适应性和对急性热应力的反应
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-07-10 DOI: 10.1093/jcbiol/ruae040
Tina Thesslund, Astrid C Wittmann, Gerrit Timmerhaus, Ragnhild S Berg, Marianne H S Hansen, Sten Siikavuopio, Tor H Evensen, Øivind Andersen
Ectothermic marine animals vary widely in their tolerance to temperature changes, and polar stenothermal species seem to have poor ability to compensate for a rise in water temperature. The sub-Arctic snow crab (Chionoecetes opilioFabricius, 1788) lives in the northwestern Atlantic Ocean and northern Pacific Ocean at temperatures ranging from about −1.5 °C to 4 °C. Since the metabolic costs overtake caloric intake above 7 °C, the snow crab appears to be energetically restricted to cold water. We investigated thermal stress responses in adult male crabs exposed to a sudden temperature increase to 9.5 °C for 24 hr after four weeks of acclimation at 2.5 °C or 5.5 °C. Heart-rate loggers implanted in a limited number of crabs showed 60% increase in cardiac activity during the thermal stress. Surplus oxygen supply in all crabs was inferred by the low hemolymph lactate and unchanged glucose levels, but only the crabs acclimated at 5.5 °C were still active at the elevated temperature. Low heat shock and oxidative stress responses were suggested by the missing upregulation of the genes encoding four heat shock proteins (Hsp70a, Hsc71, Hsp90a2, Hsp60) and the antioxidative enzymes superoxide dismutase and catalase. The trend towards inverse temperature-dependent on the expression of the hsp genes may be related to increased protein damage at low temperatures, or possible trade-offs between costs and benefits of producing heat shock proteins at elevated temperature. Although adult snow crabs seem to be able to cope with short-term heat stress, the tolerance to chronic elevated temperatures should be further examined using a larger number of individuals.
外温海洋动物对温度变化的耐受力差别很大,极地恒温物种似乎对水温上升的补偿能力很差。亚北极雪蟹(Chionoecetes opilioFabricius,1788 年)生活在大西洋西北部和太平洋北部,温度范围约为 -1.5 ℃ 至 4 ℃。由于新陈代谢成本超过了 7 °C以上的热量摄入,雪蟹似乎在能量上受限于冷水。我们研究了成年雄蟹在2.5 °C或5.5 °C的环境中适应四周后,在温度突然升至9.5 °C的环境中24小时的热应激反应。植入少量螃蟹体内的心率记录器显示,热应激期间心脏活动增加了60%。根据血淋巴乳酸较低和葡萄糖水平不变推断,所有螃蟹的供氧量都过剩,但只有在 5.5 °C下驯化的螃蟹在温度升高时仍然活跃。编码四种热休克蛋白(Hsp70a、Hsc71、Hsp90a2、Hsp60)和抗氧化酶超氧化物歧化酶和过氧化氢酶的基因上调缺失,表明热休克和氧化应激反应较低。hsp 基因的表达与温度成反比的趋势可能与低温下蛋白质损伤增加有关,也可能与高温下产生热休克蛋白的成本与收益之间的权衡有关。虽然雪蟹成蟹似乎能够应对短期热应激,但对长期高温的耐受性还需要使用更多个体进行进一步研究。
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引用次数: 0
Gomeza serrata Dana, 1852 is a trichopeltariid, not a corystid, and a junior synonym of Peltarion spinosulus (White, 1843) (Decapoda: Brachyura: Trichopeltarioidea) Gomeza serrata Dana, 1852 是一种毛鳞栉水母纲,而不是一种珊瑚虫纲,是 Peltarion spinosulus (White, 1843) 的初级异名(十足目:臂形目:毛鳞栉水母纲)。
IF 1.1 4区 生物学 Q3 MARINE & FRESHWATER BIOLOGY Pub Date : 2024-07-06 DOI: 10.1093/jcbiol/ruae037
Peter K L Ng, Marcos Tavares
The corystid Gomeza serrata Dana, 1852, described from Patagonia in South America has rarely been reported and its taxonomy is poorly understood. While superficially similar to G. bicornisGray, 1831 from the Indo-West Pacific and the type species of Gomeza Gray, 1931, direct comparisons have not been recorded. Examination of topotypic specimens show that Gomeza serrata is actually a juvenile of Peltarion spinosulus (White, 1843), a member of the family Trichopeltariidae. A neotype is selected for G. serrata to stabilize its taxonomy.
Gomeza serrata Dana,1852 年描述于南美洲巴塔哥尼亚的苍鹭很少被报道,对其分类也知之甚少。虽然表面上与印度-西太平洋的 G. bicornisGray, 1831 以及 Gomeza Gray, 1931 的模式种相似,但没有直接比较的记录。对顶型标本的研究表明,Gomeza serrata 实际上是 Peltarion spinosulus(White,1843 年)的幼体,是毛鳞鱼科(Trichopeltariidae)的成员。serrata 的新原型,以稳定其分类学。
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Journal of Crustacean Biology
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