Beta diversity of cold-water coral reef communities off western Scotland

Coral Reefs ◽  
2009 ◽  
Vol 29 (2) ◽  
pp. 427-436 ◽  
Author(s):  
Lea-Anne Henry ◽  
Andrew J. Davies ◽  
J. Murray Roberts
Keyword(s):  
Coral Reef ◽  
Beta Diversity ◽  
Cold Water ◽  
Reef Communities ◽  
Water Coral ◽  
Coral Reef Communities

North-south gradient of incidence, distribution and variations of coral reef communities in the Andaman and Nicobar Islands, India

2017 ◽  
Vol 21 (2) ◽  
pp. 289-301 ◽  
Author(s):  
N. Marimuthu ◽  
J. S. Yogesh Kumar ◽  
C. Raghunathan ◽  
N. V. Vinithkumar ◽  
R. Kirubagaran ◽  
...  
Keyword(s):  
Coral Reef ◽  
Andaman And Nicobar Islands ◽  
Reef Communities ◽  
Nicobar Islands ◽  
Coral Reef Communities

scholarly journals <sup>210</sup>Pb-<sup>226</sup>Ra chronology reveals rapid growth rate of <i>Madrepora oculata</i> and <i>Lophelia pertusa</i> on world's largest cold-water coral reef

2012 ◽  
Vol 9 (3) ◽  
pp. 1253-1265 ◽  
Author(s):  
P. Sabatier ◽  
J.-L. Reyss ◽  
J. M. Hall-Spencer ◽  
C. Colin ◽  
N. Frank ◽  
...  
Keyword(s):  
Growth Rate ◽  
Coral Reef ◽  
Metal Oxides ◽  
Growth Rates ◽  
Cold Water ◽  
Age And Growth ◽  
Lophelia Pertusa ◽  
Fe Oxide ◽  
Oxide Contamination ◽  
Water Coral

Abstract. Here we show the use of the 210Pb-226Ra excess method to determine the growth rate of two corals from the world's largest known cold-water coral reef, Røst Reef, north of the Arctic circle off Norway. Colonies of each of the two species that build the reef, Lophelia pertusa and Madrepora oculata, were collected alive at 350 m depth using a submersible. Pb and Ra isotopes were measured along the major growth axis of both specimens using low level alpha and gamma spectrometry and trace element compositions were studied. 210Pb and 226Ra differ in the way they are incorporated into coral skeletons. Hence, to assess growth rates, we considered the exponential decrease of initially incorporated 210Pb, as well as the increase in 210Pb from the decay of 226Ra and contamination with 210Pb associated with Mn-Fe coatings that we were unable to remove completely from the oldest parts of the skeletons. 226Ra activity was similar in both coral species, so, assuming constant uptake of 210Pb through time, we used the 210Pb-226Ra chronology to calculate growth rates. The 45.5 cm long branch of M. oculata was 31 yr with an average linear growth rate of 14.4 ± 1.1 mm yr−1 (2.6 polyps per year). Despite cleaning, a correction for Mn-Fe oxide contamination was required for the oldest part of the colony; this correction corroborated our radiocarbon date of 40 yr and a mean growth rate of 2 polyps yr−1. This rate is similar to the one obtained in aquarium experiments under optimal growth conditions. For the 80 cm-long L. pertusa colony, metal-oxide contamination remained in both the middle and basal part of the coral skeleton despite cleaning, inhibiting similar age and growth rate estimates. The youngest part of the colony was free of metal oxides and this 15 cm section had an estimated a growth rate of 8 mm yr−1, with high uncertainty (~1 polyp every two to three years). We are less certain of this 210Pb growth rate estimate which is within the lowermost ranges of previous growth rate estimates. We show that 210Pb-226Ra dating can be successfully applied to determine the age and growth rate of framework-forming cold-water corals if Mn-Fe oxide deposits can be removed. Where metal oxides can be removed, large M. oculata and L. pertusa skeletons provide archives for studies of intermediate water masses with an up to annual time resolution and spanning over many decades.

Detection of changes in coral reef communities using Landsat-5 TM and Landsat-7 ETM+ data

2003 ◽  
Vol 29 (2) ◽  
pp. 201-209 ◽  
Author(s):  
David Palandro ◽  
Serge Andréfouët ◽  
Frank E Muller-Karger ◽  
Phillip Dustan ◽  
Chuanmin Hu ◽  
...  
Keyword(s):  
Coral Reef ◽  
Reef Communities ◽  
Landsat 7 ◽  
Landsat 5 Tm ◽  
Coral Reef Communities

Global Biodiversity in Cold-Water Coral Reef Ecosystems

2017 ◽  
pp. 235-256 ◽  
Author(s):  
Lea-Anne Henry ◽  
J. Murray Roberts
Keyword(s):  
Coral Reef ◽  
Cold Water ◽  
Coral Reef Ecosystems ◽  
Global Biodiversity ◽  
Water Coral

scholarly journals Spatial Scales of Bacterial Diversity in Cold-Water Coral Reef Ecosystems

PLoS ONE ◽  
2012 ◽  
Vol 7 (3) ◽  
pp. e32093 ◽  
Author(s):  
Sandra Schöttner ◽  
Christian Wild ◽  
Friederike Hoffmann ◽  
Antje Boetius ◽  
Alban Ramette
Keyword(s):  
Coral Reef ◽  
Bacterial Diversity ◽  
Cold Water ◽  
Spatial Scales ◽  
Coral Reef Ecosystems ◽  
Water Coral

scholarly journals Measuring Sound at a Cold-Water Coral Reef to Assess the Impact of COVID-19 on Noise Pollution

2021 ◽  
Vol 8 ◽  
Author(s):  
Laurence H. De Clippele ◽  
Denise Risch
Keyword(s):  
Coral Reef ◽  
Coral Reefs ◽  
Sea Level ◽  
Cold Water ◽  
Noise Pollution ◽  
Ecosystem Functions ◽  
Noise Levels ◽  
Level Height ◽  
Water Coral

This study compares the noise levels at the cold-water coral Tisler reef, before and after the closure of the border between Norway and Sweden, which occurred as a direct result of the COVID-19 pandemic. The Tisler reef is a marine protected area located under a ferry “highway” that connects Norway and Sweden. Cold-water coral reefs are recognised as being important hotspots of both biodiversity and biomass, they function as breeding and nursing grounds for commercially important fish and are essential in providing ecosystem functions. Whilst studies have shown that fishery, ocean warming, and acidification threaten them, the effects of noise pollution on cold-water coral reefs remains unstudied. To study the severity of noise pollution at the Tisler reef, a long-term acoustic recorder was deployed from 29 January 2020 until 26 May 2020. From 15 March COVID-19 lockdown measures stopped passenger vessel traffic between Norway and Sweden. This study found that the overall noise levels were significantly lower after border closure, due to reduced ferry traffic, wind speeds, and sea level height. When comparing the median hourly noise levels of before vs. after border closure, this study measured a significant reduction in the 63–125 Hz 1/3 octave band noise levels of 8.94 ± 0.88 (MAD) dB during the day (07:00:00–19:59:59) and 1.94 ± 0.11 (MAD) dB during the night (20:00:00–06:59:59). Since there was no ferry traffic during the night, the drop in noise levels at night was likely driven by seasonal changes, i.e., the reduction in wind speed and sea level height when transitioning from winter to spring. Taking into account this seasonal effect, it can be deduced that the COVID-19 border closure reduced the noise levels in the 63–125 Hz 1/3 octave bands at the Tisler reef by 7.0 ± 0.99 (MAD) dB during the day. While the contribution of, and changes in biological, weather-related and geophysical sound sources remain to be assessed in more detail, understanding the extent of anthropogenic noise pollution at the Tisler cold-water coral reef is critical to guide effective management to ensure the long-term health and conservation of its ecosystem functions.

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