Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California
Coral <i>δ</i><sup>18</sup>O variations are used as a proxy for changes in sea surface temperature (SST) and seawater isotope composition. Skeletal <i>δ</i><sup>13</sup>C of coral is frequently used as a proxy for solar radiation because most of its va...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2016-05-01
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| Series: | Biogeosciences |
| Online Access: | http://www.biogeosciences.net/13/2675/2016/bg-13-2675-2016.pdf |
| _version_ | 1818025428760133632 |
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| author | R. A. Cabral-Tena A. Sánchez H. Reyes-Bonilla A. H. Ruvalcaba-Díaz E. F. Balart |
| author_facet | R. A. Cabral-Tena A. Sánchez H. Reyes-Bonilla A. H. Ruvalcaba-Díaz E. F. Balart |
| author_sort | R. A. Cabral-Tena |
| collection | DOAJ |
| description | Coral <i>δ</i><sup>18</sup>O variations are used as a proxy for changes in sea
surface temperature (SST) and seawater isotope composition. Skeletal <i>δ</i><sup>13</sup>C of coral is frequently used as a proxy for solar radiation because
most of its variability is controlled by an interrelationship between three
processes: photosynthesis, respiration, and feeding. Coral growth rate is
known to influence the <i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C isotope record to a
lesser extent than environmental variables. Recent published data show
differences in growth parameters between female and male coral in the
gonochoric brooding coral <i>Porites panamensis</i>; thus, skeletal
<i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C are hypothesized to be different in each
sex. To test this, this study describes changes in the skeletal
<i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C record of four female and six male
<i>Porites panamensis</i> coral collected in Bahía de La Paz, Mexico,
whose growth bands spanned 12 years. The isotopic data were compared to SST,
precipitation, photosynthetically active radiation (PAR), chlorophyll <i>a</i>,
and skeletal growth parameters. <i>Porites panamensis</i> is a known
gonochoric brooder whose growth parameters are different in females and
males. Splitting the data by sexes explained 81 and 93 % of the
differences of <i>δ</i><sup>18</sup>O, and of <i>δ</i><sup>13</sup>C, respectively, in the
isotope record between colonies. Both isotope records were different between
sexes. <i>δ</i><sup>18</sup>O was higher in female colonies than in male colonies,
with a 0.31 ‰ difference; <i>δ</i><sup>13</sup>C was lower in female
colonies, with a 0.28 ‰ difference. A difference in the skeletal
<i>δ</i><sup>18</sup>O could introduce an error in SST estimates of ≈ 1.0
to ≈ 2.6 °C. The <i>δ</i><sup>18</sup>O records showed
a seasonal pattern that corresponded to SST, with low correlation
coefficients (−0.45, −0.32), and gentle slopes (0.09,
0.10 ‰ °C<sup>−1</sup>) of the <i>δ</i><sup>18</sup>O–SST relation.
Seasonal variation in coral <i>δ</i><sup>18</sup>O represents only 52.37 and
35.66 % of the SST cycle; 29.72 and 38.53 % can be attributed to
<i>δ</i><sup>18</sup>O variability in seawater. <i>δ</i><sup>13</sup>C data did not
correlate with any of the environmental variables; therefore, variations in
skeletal <i>δ</i><sup>13</sup>C appear to be driven mainly by metabolic effects. Our
results support the hypothesis of a sex-associated difference in skeletal
<i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C signal, and suggest that environmental
conditions and coral growth parameters affect skeletal isotopic signals
differently in each sex. Although these findings relate to one gonochoric
brooding species, they may have some implications for the more commonly used
gonochoric spawning species such as <i>Porites lutea</i> and
<i>Porites lobata</i>. |
| first_indexed | 2024-12-10T04:15:57Z |
| format | Article |
| id | doaj.art-085c6898dd27446c9da5bc5b0afe179e |
| institution | Directory Open Access Journal |
| issn | 1726-4170 1726-4189 |
| language | English |
| last_indexed | 2024-12-10T04:15:57Z |
| publishDate | 2016-05-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Biogeosciences |
| spelling | doaj.art-085c6898dd27446c9da5bc5b0afe179e2022-12-22T02:02:35ZengCopernicus PublicationsBiogeosciences1726-41701726-41892016-05-011392675268710.5194/bg-13-2675-2016Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of CaliforniaR. A. Cabral-Tena0A. Sánchez1H. Reyes-Bonilla2A. H. Ruvalcaba-Díaz3E. F. Balart4Centro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Baja California Sur 23096, MexicoCentro Interdisciplinario de Ciencias Marinas–Instituto Politécnico Nacional (CICIMAR-IPN), La Paz, Baja California Sur 23096, MexicoDepartamento de Biología Marina, Universidad Autónoma de Baja California Sur (UABCS), La Paz, Baja California Sur 23080, MexicoCentro Interdisciplinario de Ciencias Marinas–Instituto Politécnico Nacional (CICIMAR-IPN), La Paz, Baja California Sur 23096, MexicoCentro de Investigaciones Biológicas del Noroeste (CIBNOR), La Paz, Baja California Sur 23096, MexicoCoral <i>δ</i><sup>18</sup>O variations are used as a proxy for changes in sea surface temperature (SST) and seawater isotope composition. Skeletal <i>δ</i><sup>13</sup>C of coral is frequently used as a proxy for solar radiation because most of its variability is controlled by an interrelationship between three processes: photosynthesis, respiration, and feeding. Coral growth rate is known to influence the <i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C isotope record to a lesser extent than environmental variables. Recent published data show differences in growth parameters between female and male coral in the gonochoric brooding coral <i>Porites panamensis</i>; thus, skeletal <i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C are hypothesized to be different in each sex. To test this, this study describes changes in the skeletal <i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C record of four female and six male <i>Porites panamensis</i> coral collected in Bahía de La Paz, Mexico, whose growth bands spanned 12 years. The isotopic data were compared to SST, precipitation, photosynthetically active radiation (PAR), chlorophyll <i>a</i>, and skeletal growth parameters. <i>Porites panamensis</i> is a known gonochoric brooder whose growth parameters are different in females and males. Splitting the data by sexes explained 81 and 93 % of the differences of <i>δ</i><sup>18</sup>O, and of <i>δ</i><sup>13</sup>C, respectively, in the isotope record between colonies. Both isotope records were different between sexes. <i>δ</i><sup>18</sup>O was higher in female colonies than in male colonies, with a 0.31 ‰ difference; <i>δ</i><sup>13</sup>C was lower in female colonies, with a 0.28 ‰ difference. A difference in the skeletal <i>δ</i><sup>18</sup>O could introduce an error in SST estimates of ≈ 1.0 to ≈ 2.6 °C. The <i>δ</i><sup>18</sup>O records showed a seasonal pattern that corresponded to SST, with low correlation coefficients (−0.45, −0.32), and gentle slopes (0.09, 0.10 ‰ °C<sup>−1</sup>) of the <i>δ</i><sup>18</sup>O–SST relation. Seasonal variation in coral <i>δ</i><sup>18</sup>O represents only 52.37 and 35.66 % of the SST cycle; 29.72 and 38.53 % can be attributed to <i>δ</i><sup>18</sup>O variability in seawater. <i>δ</i><sup>13</sup>C data did not correlate with any of the environmental variables; therefore, variations in skeletal <i>δ</i><sup>13</sup>C appear to be driven mainly by metabolic effects. Our results support the hypothesis of a sex-associated difference in skeletal <i>δ</i><sup>18</sup>O and <i>δ</i><sup>13</sup>C signal, and suggest that environmental conditions and coral growth parameters affect skeletal isotopic signals differently in each sex. Although these findings relate to one gonochoric brooding species, they may have some implications for the more commonly used gonochoric spawning species such as <i>Porites lutea</i> and <i>Porites lobata</i>.http://www.biogeosciences.net/13/2675/2016/bg-13-2675-2016.pdf |
| spellingShingle | R. A. Cabral-Tena A. Sánchez H. Reyes-Bonilla A. H. Ruvalcaba-Díaz E. F. Balart Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California Biogeosciences |
| title | Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California |
| title_full | Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California |
| title_fullStr | Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California |
| title_full_unstemmed | Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California |
| title_short | Sex-associated variations in coral skeletal oxygen and carbon isotopic composition of <i>Porites panamensis</i> in the southern Gulf of California |
| title_sort | sex associated variations in coral skeletal oxygen and carbon isotopic composition of i porites panamensis i in the southern gulf of california |
| url | http://www.biogeosciences.net/13/2675/2016/bg-13-2675-2016.pdf |
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