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Observation Article

The reproductive season of scleractinian corals in Socotra, Yemen

[version 1; peer review: 2 approved]
PUBLISHED 27 Mar 2014
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Abstract

Determining when corals reproduce has clear management and economic implications. Here we document the reproductive condition of corals in the genus Acropora on the island of Socotra in Yemen during February 2014. Twenty percent of colonies (n = 143) contained mature gametes and 28% had immature gametes indicating that spawning will occur in both February and March in 2014, confirming previous anecdotal reports of coral spawning at this time in Socotra. Acropora typically reproduce in synchrony with many other broadcast spawning scleractinian corals, and we therefore predict that many other species are reproductively active at this time of year.

Observation

Most hermatypic scleractinian corals have an annual gametogenic cycle that culminates in the broadcast spawning of gametes once per year1. In most reef regions, numerous species spawn in sychrony following full moons when sea surface temperature is either rising or falling2,3. Determining exactly when spawning takes place has important implications for reef management and clear economic benefits4. For example, activities that are likely to limit fertilization success, such as dredging, can be prohibited during these often brief spawning periods5. In addition, the diving industry can benefit from public interest in coral spawning.

Here, we document the reproductive condition of Acropora corals on the island of Socotra, Republic of Yemen. The island, located 240 km east of the Horn of Africa and 380 km south of the Arabian Peninsula, supports a diverse scleractinian fauna of over 250 species6, and includes sites with a high cover of Acropora (Figure 1). Acropora colonies were sampled before the full moon on 15 February 2014 to determine their reproductive condition. Three reproductive conditions were defined based on the appearance of the oocytes as observed with the naked eye in the field : 7 (1) mature - oocytes pigmented and therefore likely to spawn within a month (2) immature - oocytes pale but visible indicating that they are close to maturity and likely to spawn within two to three months (3) empty - oocytes too small to see or absent indicating either that the colony has recently spawned, or is unlikely to do so for at least three months.

d9890b5c-9d87-4070-9462-1f117624c65e_figure1.gif

Figure 1. The island of Socotra supports diverse assemblages of Acropora species.

A total of 143 Acropora colonies from approximately 14 species were sampled at four sites on the north of Socotra (Samerhur 12°41'40.96"N, 53°29'3.69"E; Qaiso 12°39'58.91"N, 53°24'33.86"E; Dihamri 12°40'20.35"N, 54°11'39.96"E; Hadibo 12°40'0.77"N, 54° 3'7.74"E) between the 31 January and 8 February 2014 (Table 1). Twenty percent of colonies contained mature oocytes (Figure 2), 28% contained immature oocytes and no oocytes were visible in the remaining 52% of colonies (Table 1). Colonies with mature oocytes are highly likely to spawn at some time around the full moon in February 2014, whereas colonies with immature oocytes are likely to spawn in March 2014. The remaining colonies have either spawned recently, or alternatively, there could be a second reproductive season later in the year, similar to Western Australia8, Singapore9 and some locations in Indonesia1. Ten species had at least one colony with mature gametes (Table 1) suggesting a multi-species spawning event is likely in February 2014. The Acropora typically reproduce at much the same time as most other broadcast spawning scleractinian corals10,11 and therefore we predict that many other species will be spawning in February and March in Socotra. Our results confirm previous anecdotal reports of coral spawning on Socotra in February and March6. In addition, these data add to a growing body of evidence indicating that multi-specific spawning synchrony is a feature of all speciose coral assemblages1.

Table 1. The percentage of Acropora colonies with mature-, immature- or no oocytes, sampled between 31 January and 8 February 2014 on Socotra Yemen.

n = number of sampled colonies.

SpeciesPercentage maturePercentage immaturePercentage emptyn
Acropora appressa 100001
Acropora dendrum 100002
Acropora downingi 079314
Acropora cf humilis 8464613
Acropora lamarki 3333333
Acropora cf lutkeni 33333312
Acropora microphthalma 001002
Acropora formosa 0118918
Acropora nasuta 100001
Acropora roseni 0277311
Acropora cf solitaryensis 673303
Acropora cf spicifera 21384248
Acropora valida 4433229
Acropora verweyi 5017336
Total202852143
d9890b5c-9d87-4070-9462-1f117624c65e_figure2.gif

Figure 2. Mature (colored) oocytes are clearly visible in the branches of Acropora colonies.

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Version 2
VERSION 2 PUBLISHED 27 Mar 2014
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Baird AH, Abrego D, Howells EJ and Cumbo VR. The reproductive season of scleractinian corals in Socotra, Yemen [version 1; peer review: 2 approved]. F1000Research 2014, 3:78 (https://doi.org/10.12688/f1000research.3846.1)
NOTE: If applicable, it is important to ensure the information in square brackets after the title is included in all citations of this article.
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Open Peer Review

Current Reviewer Status: ?
Key to Reviewer Statuses VIEW
ApprovedThe paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approvedFundamental flaws in the paper seriously undermine the findings and conclusions
Version 1
VERSION 1
PUBLISHED 27 Mar 2014
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Reviewer Report 01 Apr 2014
Bert W. Hoeksema, Department of Marine Zoology, Naturalis Biodiversity Center, Leiden, The Netherlands 
Approved
VIEWS 30
This short publication presents clear results and is well written. I have one comment. The conclusive sentence seems redundant, and may need rephrasing or some additional explanation if the authors want to maintain it. “In addition, these data add to ... Continue reading
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CITE
HOW TO CITE THIS REPORT
Hoeksema BW. Reviewer Report For: The reproductive season of scleractinian corals in Socotra, Yemen [version 1; peer review: 2 approved]. F1000Research 2014, 3:78 (https://doi.org/10.5256/f1000research.4119.r4321)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response (F1000Research Advisory Board Member) 08 Apr 2014
    Andrew Baird, ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4812, Australia
    08 Apr 2014
    Author Response F1000Research Advisory Board Member
    We have removed the sentence as suggested.
    Competing Interests: No competing interests were disclosed.
COMMENTS ON THIS REPORT
  • Author Response (F1000Research Advisory Board Member) 08 Apr 2014
    Andrew Baird, ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4812, Australia
    08 Apr 2014
    Author Response F1000Research Advisory Board Member
    We have removed the sentence as suggested.
    Competing Interests: No competing interests were disclosed.
Views
34
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Reviewer Report 28 Mar 2014
Jean Kenyon, Hawaiian and Pacific Islands National Wildlife Refuge Complex, US Fish and Wildlife Service, Honolulu, HI, USA 
Approved
VIEWS 34
Background information, purpose of study, data, and interpretation are all clearly and concisely presented. Documentation of coral sexual reproductive status at Socotra, Yemen in 14 species of Acropora provides a useful first contribution to improved understanding of global patterns of ... Continue reading
CITE
CITE
HOW TO CITE THIS REPORT
Kenyon J. Reviewer Report For: The reproductive season of scleractinian corals in Socotra, Yemen [version 1; peer review: 2 approved]. F1000Research 2014, 3:78 (https://doi.org/10.5256/f1000research.4119.r4277)
NOTE: it is important to ensure the information in square brackets after the title is included in all citations of this article.
  • Author Response (F1000Research Advisory Board Member) 08 Apr 2014
    Andrew Baird, ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4812, Australia
    08 Apr 2014
    Author Response F1000Research Advisory Board Member
    We have changed the title to “The reproductive season of Acropora in Socotra, Yemen”.
    We have also provided the number of Acropora species reported to occur in Socotra as listed by ... Continue reading
COMMENTS ON THIS REPORT
  • Author Response (F1000Research Advisory Board Member) 08 Apr 2014
    Andrew Baird, ARC Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4812, Australia
    08 Apr 2014
    Author Response F1000Research Advisory Board Member
    We have changed the title to “The reproductive season of Acropora in Socotra, Yemen”.
    We have also provided the number of Acropora species reported to occur in Socotra as listed by ... Continue reading

Comments on this article Comments (0)

Version 2
VERSION 2 PUBLISHED 27 Mar 2014
Comment
Alongside their report, reviewers assign a status to the article:
Approved - the paper is scientifically sound in its current form and only minor, if any, improvements are suggested
Approved with reservations - A number of small changes, sometimes more significant revisions are required to address specific details and improve the papers academic merit.
Not approved - fundamental flaws in the paper seriously undermine the findings and conclusions
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