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Deep-water rhodolith bed from central Brazilian continental shelf, Campos Basin: coralline algal and faunal taxonomic composition 坎波斯盆地巴西中部大陆架深水罗石床:珊瑚藻和动物分类组成
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.16.21
F. Tâmega, D. Bassi, M. Figueiredo, A. Cherkinsky
Rhodolith beds are distributed from the north­ eastern to the southeastern Brazilian continental shelf, constituting the largest extension of coralline algal de­ posits in the world. Little is known about the deep rho­ dolith beds within the Campos Basin: the largest oil pro­ duction area in the country and a priority area for marine life conservation. This study illustrates a deep rhodolith bed covering about 15 km of a 40 km­area in the Peregrino oil field sampled at 100-106 m water depth. Coralline algae are the dominant components on the living rhodolith surfaces associated with subordinate bryozoans, cnidarids, brachiopods and porifers. In some inner parts of the coralline algal nodules, encrusting acervulinid fora­ minifera are the main nodule contributors. Through accel­ erator mass spectrometric analysis, radiocarbon age esti­ mates show that the range in ages between the living outer rhodolith parts and within 3 mm from it the rhodoliths is ca. 4,700 years. This suggests that a proportion of fossil rhodoliths had been recolonized after periods of burial and/or erosion. The present­day Peregrino rhodolith bed played a fundamental ecological role in the Brazilian con­ tinental shelf’s benthic habitats for thousands of years.
罗氏岩床分布于巴西大陆架东北部至东南部,构成了世界上最大的珊瑚藻沉积区。坎波斯盆地是该国最大的石油生产区,也是海洋生物保护的优先区域,但人们对该盆地的深层岩床知之甚少。该研究展示了Peregrino油田在100-106米水深取样的40公里区域中覆盖约15公里的深菱形岩层。珊瑚藻是与苔藓虫、刺胞动物、腕足动物和孢子虫相关的活rhodolith表面的主要成分。在珊瑚藻结核的某些内部,包覆的微泡藻是结核的主要贡献者。通过加速器质谱分析,放射性碳年龄估计表明,在活着的外红石部分和距它3毫米以内的红石之间的年龄范围约为4700年。这表明,在埋藏和/或侵蚀的时期之后,一部分化石红石被重新定植。如今的佩雷格里诺罗氏岩床在巴西大陆架底栖生物栖息地中发挥了数千年的基本生态作用。
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引用次数: 10
Association of epibiotic fluorescent isopods with the coral-killing sponge Chalinula nematifera 表生荧光等足类动物与杀珊瑚海绵线虫的关系
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.19.1_3
M. Naumann
Marine sponges often host metazoan epiand endobionts such as polychaetes or crustaceans that are provided with important functional benefits (e.g. shelter and food) (Wulff et al. 2006). However, evidence for potential benefits gained by the sponge hosts from these associations is scarce. The coral reef sponge Chalinula nematifera (Haplosclerida, Chalinidae; de Laubenfels, 1954) occurs throughout the tropical Indo-West Pacific and has recently been reported to frequently infest, kill and rapidly overgrow various scleractinian coral taxa along the eastern coast of Sulawesi Island, Indonesia (Rossi et al. 2015). To date, the drivers transforming C. nematifera into this potential threat to coral reefs are unknown. During exploratory dives at four sites around Banta Island (8°23′50.86′′S, 119°19′2.83′′E; Lesser Sunda Islands, Indonesia) in July 2009, C. nematifera was frequently (>50 times) observed spreading over living scleractinian coral colonies on the fore reef (5-10 m water depth; Fig. 1a). In more than 75% of encounters, C. nematifera was associated with dense clusters of minute (size <5 mm), red fluorescent epizoans (up to 8 ind. cm sponge), which were identified as isopods of the genus Santia (Asellota, Santiidae; Sivertsen and Holthuis, 1980) crawling on the sponge surface close to sponge-coral overgrowth zones (Fig. 1b, c). At the explored reef sites, red fluorescent Santia isopods were exclusively found associated with C. nematifera. Lindquist et al. (2005) reported that these Santia isopods owe their bright coloration to dense carpets of unicellular cyanobacteria covering their exoskeletons, which Santia cultivate for consumption. Besides red fluorescence, the cyanobacteria episymbionts produce chemical defense compounds repulsive to reef fishes, and thereby effectively lower predation pressure on their isopod hosts (Lindquist et al. 2005). Whether this microbe-mediated chemical defense function, vital to the isopod-cyanobacteria symbiosis, may potentially also benefit the frequently associated sponge host C. nematifera, i.e. by causing lowered predation pressure due to repulsion of spongivorous fish species, and thus promote its rapid overgrowth of scleractinian corals, remains to be investigated.
海洋海绵通常是后生动物表皮和内源性生物的宿主,如多毛动物或甲壳类动物,它们具有重要的功能效益(例如住所和食物)(Wulff et al. 2006)。然而,海绵宿主从这些关联中获得潜在利益的证据很少。珊瑚礁海绵Chalinula nematifera (Haplosclerida, chalinae);de Laubenfels, 1954)发生在整个热带印度洋-西太平洋地区,最近有报道称,在印度尼西亚苏拉威西岛东海岸,它经常侵染、杀死并迅速过度生长各种石珊瑚分类群(Rossi et al. 2015)。迄今为止,将线虫转化为对珊瑚礁的潜在威胁的驱动因素尚不清楚。在班塔岛周围四个地点(南纬8°23′50.86”,东经119°19′2.83”;2009年7月,在印度尼西亚小巽他群岛(Lesser Sunda Islands, Indonesia)的前礁(5-10 m水深;图1 a)。在超过75%的接触中,线虫与密集的微小(大小<5毫米)红色荧光绦虫(高达8厘米的海绵)相关联,这些绦虫被鉴定为桑迪亚属等足类(无齿目,桑迪亚科;Sivertsen和Holthuis, 1980)在靠近海绵珊瑚过度生长区域的海绵表面爬行(图1b, c)。在探索的珊瑚礁地点,只发现了与c . nematifera相关的红色荧光Santia等足类。Lindquist等人(2005)报道说,这些桑蒂亚等足类动物的鲜艳颜色归功于覆盖其外骨骼的单细胞蓝藻的密集地毯,桑蒂亚培养这些细菌是为了食用。除了红色荧光外,蓝藻附生生物还产生对礁鱼排斥的化学防御化合物,从而有效地降低了对等足类宿主的捕食压力(Lindquist et al. 2005)。这种微生物介导的化学防御功能(对等足类与蓝藻共生至关重要)是否也可能对经常相关的海绵宿主C. nematifera有利,即由于海绵状鱼类的排斥而降低捕食压力,从而促进其快速过度生长的硬核珊瑚,仍有待研究。
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引用次数: 0
Conditions of coral communities in the Gulf of Thailand: a decade after the 1998 severe bleaching event 泰国湾珊瑚群落的状况:1998年严重白化事件后的十年
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.11.207
T. Yeemin, Chaipichit Saenghaisuk, M. Sutthacheep, Sittiporn Pengsakun, Walaya Klinthong, Kanwala Saengmanee
This paper documents the conditions of selected coral communities in the Gulf of Thailand with an insight into the degree of resistance and resilience to coral bleaching and localized anthropogenic disturbances. Live coral coverage at the study sites ranged from 5.2% at Koh Samui to 64.3% at Koh Lan. The most dominant coral species was Porites lutea. Only a few colonies of Acropora were found at the study sites. The most abundant macrobenthic animal was the sea urchin, Diadema setosum, with the highest population density 7.9 of individuals/m2 at Koh Khang Khao and D. setosum was not recorded in the belt transects at Koh Samui. Most coral colonies at Koh Lan showed partial mortality (77%), mainly pink spot and white band syndromes, and reflected potential impacts from coastal tourism. The highest recorded juvenile coral density was 8.3 colonies/m2 at Koh Kood while the lowest one was 1.1 colonies/m2 at Koh Khang Khao. The most abundant juvenile coral at all study sites was Porites spp. The occurrence of low live coral coverage and juvenile coral density in conjunction with high densities of the sea urchin D. setosum at Koh Khang Khao may partly explain why there are no structural reefs on the coasts of many islands in the inner part of the Gulf of Thailand. In addition, the present study documents macroalgae-dominated communities at Koh Samui and implies appropriate strategies and measures for coral reef restoration.
本文记录了泰国湾选定的珊瑚群落的条件,并深入了解了珊瑚白化和局部人为干扰的抵抗和恢复程度。研究地点的活珊瑚覆盖率由苏梅岛的5.2%至高兰岛的64.3%不等。最主要的珊瑚种是黄斑珊瑚。在研究地点只发现了几个鹿角蚁群。大型底栖动物中数量最多的是海胆(Diadema setosum),在Koh Khang Khao的种群密度最高,为7.9只/m2,而在苏梅岛的带样带中没有记录到Diadema setosum。大部分在高兰的珊瑚群落出现部分死亡(77%),主要是粉斑和白带综合症,反映了海岸旅游业的潜在影响。高固稚珊瑚密度最高,为8.3个/平方米,高康高最低,为1.1个/平方米。在所有研究地点中,最丰富的幼珊瑚是Porites spp. Koh Khang Khao的活珊瑚覆盖率和幼珊瑚密度低,加上海胆密度高,这可能部分解释了为什么泰国湾内陆许多岛屿的海岸没有结构性珊瑚礁。此外,本研究记录了苏梅岛以大型藻类为主的群落,并提出了适当的珊瑚礁恢复策略和措施。
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引用次数: 25
Bleaching in the Ryukyu Islands in 2016 and associated Degree Heating Week threshold 2016年琉球群岛的白化现象和相关的升温周阈值
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.19.1_17
H. Kayanne, Rintaro Suzuki, Gang Liu
In the summer of 2016, coral reefs in the Ryukyu Islands, Japan suffered from extensive bleaching. The most severe bleaching occurred in Ishigaki Island, with 90% and 40-55% corals bleached in Sekisei Lagoon and Shiraho Reef, respectively (Fig. 1a). In Okinawa, 50-80% of corals were bleached (Fig. 1b). This event was part of a global bleaching event starting in the Mariana Islands in June 2014 and expanding to the South Pacific and Indian Ocean in 2015 and the northern Great Barrier Reef in March 2016 (Hughes et al., 2017) followed by the Ryukyu Islands. The progress of the event was similar to that of 1997-1998 associated with a strong El Niño and finished in the Ryukyu Islands. The spatial distribution of the 2016 bleaching was highly heterogeneous in the northwestern Pacific: most severe in Ishigaki and severe in Okinawa in the southern Ryukyus; moderate in Amami in the northern Ryukyus; limited in Kochi and Kushimoto along the mainland Japan; and only mild or no bleaching in Ogasawara, Guam, and Palau (Electronic Supplementary Mate rial Table 1*). The se verity of the observed bleaching matched well spatially with NOAA Coral Reef Watch’s near real-time satellite 50 km coral bleaching Degree Heating Week (DHW) (Liu et al., 2013) for these sites: the highest values in Ishigaki (10.7°C-weeks) and Oki nawa (10.5), high in Amami (8.2), moderate in Kochi Bleaching in the Ryukyu Islands in 2016 and associated Degree Heating Week threshold
2016年夏天,日本琉球群岛的珊瑚礁大面积白化。最严重的白化发生在石垣岛,Sekisei泻湖和Shiraho礁分别有90%和40-55%的珊瑚白化(图1a)。在冲绳,50-80%的珊瑚白化(图1b)。这一事件是全球白化事件的一部分,始于2014年6月的马里亚纳群岛,2015年扩展到南太平洋和印度洋,2016年3月扩展到大堡礁北部(Hughes et al., 2017),随后是琉球群岛。该事件的进展类似于1997-1998年与强厄尔尼诺Niño有关的事件,并在琉球群岛结束。2016年西北太平洋白化的空间分布具有高度异质性:石垣最严重,琉球南部的冲绳最严重;琉球北部奄美温和;在日本大陆沿线的高知县和钏本市有限;在小笠原、关岛和帕劳只有轻微或没有白化(电子补充试验表1*)。观测到的白化程度在空间上与NOAA珊瑚礁观察的近实时卫星50公里珊瑚白化度加热周(DHW) (Liu et al., 2013)很好地匹配:2016年石崎(10.7°c -周)和Oki nawa(10.5°c -周)的值最高,在Amami(8.2°c -周)高,在琉球群岛的高知白化(中等)和相关的度加热周阈值
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引用次数: 24
Intense capture of swarming pteropods by large-polyp corals 大型珊瑚虫珊瑚密集捕捉成群的翼足类动物
Pub Date : 1900-01-01 DOI: 10.3755/galaxea.21.1_9
Y. Lindemann, G. Eyal, A. Genin
Snorkeling about an hour after sunrise, November 6, 2016, we observed high densities of pteropods (Creseis acicula (Rang, 1828); visually estimated >3 pteropods l) swarming in the waters above the shallow coral reef of Eilat, Israel. Many pteropods were captured by massive corals with large polyps (Merulinidae: Dipsastraea spp., Favites spp., Platygyra sp. and others). Some of the captured pteropods exceeded one cm in length. In some corals, we observed single polyps ingesting up to three pteropods (Fig 1 A, B). Empty shells were found on the bottom beneath the corals. Neither captured pteropods nor empty shells were found in or around corals with small polyps, including Acropora spp., Pocillopora damicornis (Linnaeus, 1758), and Stylophora pistillata Esper, 1797. Corals with large polyps are thought to feed on larger zooplankton, mostly crustaceans (e.g., Porter 1976). Although Janssen (2007) anecdotally mentions an observation of live corals feeding on pteropods following the mass stranding of C. acicula in the shallow waters of Dahab, Red Sea, mentioning of pteropods as a component in coral diet are scarce (Comeau et al. 2013). Our observation provides evidence, however qualitative, for a remarkable difference between corals with large vs. small polyps in their ability to prey on large zooplankton. As repetitive swarming of pteropods were reported from certain reefs (Goswami et al. 1982; Janssen 2007), our findings suggest that their contribution to the corals’ diet may be significant.
2016年11月6日,在日出后约一小时的浮潜中,我们观察到高密度的翼足类动物(Creseis acicula (Rang, 1828);目视估计超过3只翼足类动物在以色列埃拉特的浅水珊瑚礁上群集。许多翼足类动物被带有大型水螅的大型珊瑚捕获(水螅科:Dipsastraea spp., Favites spp., Platygyra sp.等)。一些捕获的翼足类动物身长超过1厘米。在一些珊瑚中,我们观察到单个珊瑚虫吞食多达三只翼足类动物(图1a, B)。在珊瑚下方的底部发现了空壳。在有小珊瑚虫的珊瑚体内或周围,包括Acropora spp.、Pocillopora damicornis (Linnaeus, 1758)和Stylophora pisttillata Esper, 1797),均未发现捕获的翼足类动物或空壳。有大水螅体的珊瑚被认为以较大的浮游动物为食,主要是甲壳类动物(例如,Porter 1976)。尽管Janssen(2007)轶事地提到了在红海Dahab浅水区大量搁浅C. acicula后,活珊瑚以翼足类动物为食的观察,但很少提及翼足类动物作为珊瑚饮食的组成部分(Comeau et al. 2013)。我们的观察提供了证据,无论质量如何,在大型珊瑚虫和小型珊瑚虫的珊瑚之间,它们捕食大型浮游动物的能力存在显著差异。据报道,翼足类动物在某些珊瑚礁上反复聚集(Goswami et al. 1982;Janssen 2007),我们的研究结果表明它们对珊瑚饮食的贡献可能是显著的。
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引用次数: 3
Transplanted Acropora tenuis (Dana) spawned first in their life 4 years after culture from eggs 移植的小鹿角(Acropora tenuis, Dana)在卵培养4年后首次产卵
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.12.47
K. Iwao, M. Omori, H. Taniguchi, M. Tamura
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引用次数: 37
First record of Phycocaris simulans (Decapoda; Hippolytidae) from the Republic of Maldives 十足目拟藻(Phycocaris simulans;海马科),产自马尔代夫共和国
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.20.1_11
L. Saponari, P. Galli, S. Montano
Thus, to the best of our knowledge this finding represents the first record of P. simulans in the Republic of Maldives and it confirms that this species is more widespread throughout the Indian Ocean than previously thought. Considering the paucity of studies regarding this genus, further investigations are needed to clarify its habitat preferences, distribution and diversity.
因此,据我们所知,这一发现代表了马尔代夫共和国首次记录的拟南鲷,它证实了该物种在整个印度洋的分布比以前认为的要广泛。考虑到对该属的研究较少,需要进一步调查以阐明其生境偏好、分布和多样性。
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引用次数: 0
Observations of Culcita novaeguineae spawning events 新库尔塔产卵事件的观察
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.13.1
K. Ohta, N. Yasuda, S. Nagai, K. Oki, Coralie Taquet, K. Nadaoka
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引用次数: 4
A novel substrate (the “coral peg”) for deploying sexually propagated corals for reef restoration 一种新型基质(“珊瑚钉”),用于部署有性繁殖的珊瑚进行珊瑚礁恢复
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.11.39
M. Omori, K. Iwao
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引用次数: 15
On the use of the bumphead parrotfish (Bolbometopon muricatum) as a mobile shelter by a bluefin trevally (Caranx melampygus) in an oceanic reef system in the Philippines 菲律宾海洋珊瑚礁系统中蓝鳍鲹(Caranx melampygus)使用凸头鹦嘴鱼(Bolbometopon muricatum)作为移动庇护所
Pub Date : 1900-01-01 DOI: 10.3755/GALAXEA.23.1_7
Kent Elson S. Sorgon, Victor Ticzon, Badi R. Samaniego, Marion Michael A. Bacabac, Jesus Gabriel C. Fetil
bluefin trevally Caranx melampygus Cuvier, is an obligate piscivore common in Indo-Pacific and East Pacific reefs and has been known to act as both a transient (i.e., transitory) roving and an ambush predator (Sancho 2000; Sancho al.
蓝鳍鱼(俗称Caranx melampygus Cuvier)是一种在印度太平洋和东太平洋珊瑚礁中常见的专性鱼科鱼类,众所周知,它既是一种短暂的(即,短暂的)巡游者,也是一种伏击捕食者(Sancho 2000;桑丘。
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引用次数: 0
期刊
Galaxea, Journal of Coral Reef Studies
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