Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence
In most birds egg volume has been recorded directly dependant on clutch sequence. Furthermore, the egg size has been also considered as dependent on the size of its predecessor, thus, they are constantly analyzed with non-parametric statistics, given the independency required by the parametric one....
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Iniversidad Autónoma de Baja California
2002
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oai:cienciasmarinas.com.mx:article-2132019-05-02T17:49:42Z Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence Independencia en los volúmenes de los huevos de la gaviota parda (Larus heermanni), con base en su secuencia de puesta Carmona, R Lozano, E egg volume statistics dependency Larus heermanni volumen de huevos estadística dependencia Larus heermanni In most birds egg volume has been recorded directly dependant on clutch sequence. Furthermore, the egg size has been also considered as dependent on the size of its predecessor, thus, they are constantly analyzed with non-parametric statistics, given the independency required by the parametric one. We studied the Heermann's gull (Larus heermanni) colony at El Callo Islet (south of San José Island, B.C.S.) during its reproductive season (1996). Twenty-seven nests were followed and identified with plastic flags. The eggs were marked (according to their appearance) and measured (length and width), in order to calculate their volume. The analysis of the volume of 66 eggs showed normality and homocedasticity (in all cases α = 0.05). The volume comparison by clutch sequence evidenced that the first and second eggs were similar, but both differed from third eggs ( x- ± SE: 57.59 ± 1.52, 56.62 ± 1.75 and 52.66 ± 2.48 cm3, respectively). Furthermore, three simple linear correlations were performed (first-second, first-third and second-third), in order to evidenciate the supposed size-dependence on previous eggs. No relationship could be established in either comparisons (r = 0.143, 0.08 and 0.291; d.f.= 23, 14 and 14, P = 0.502, 0.784 and 0.313, respectively). This means that the egg volume depends on the clutch sequence, but not necessarily on the volume of previous eggs, indicating the need of testing such dependency and, consequently, the type of statistical analysis to be used. En la mayoría de las aves, el volumen de los huevos es dependiente de la secuencia de puesta. Además, se considera que el tamaño de un huevo depende del tamaño de su(s) predecesor(es), por lo que los análisis se realizan por medio de estadística no paramétrica, dado el requerimiento de independencia de la estadística paramétrica. Se estudió la colonia reproductiva de gaviota parda (Larus heermanni) en el Islote El Callo, al sur de Isla San José, B.C.S. (1996), visitándola cada dos días a partir de la aparición del primer huevo. Se identificaron 27 nidos, los huevos fueron marcados en orden de aparición y medidos (largo y ancho), para calcular sus volúmenes. El análisis de los volúmenes de 66 huevos mostró que éstos presentaron normalidad y homocedasticidad (α = 0.05, en todos los casos). La comparación de los volúmenes por secuencia de puesta, evidenció que los primeros y los segundos huevos fueron iguales entre sí y diferentes, en ambos casos, de los terceros (x-± ES: 57.59 ± 1.52, 56.62 ± 1.75 y 52.66 ± 2.48 cm3, respectivamente). Se realizaron tres correlaciones lineales simples (primeros-segundos, primerosterceros y segundos-terceros), para evidenciar la supuesta dependencia del tamaño de los huevos. No hubo relación en ninguna de las comparaciones (r = 0.143, 0.08 y 0.291; g.l.= 23, 14 y 14, P = 0.502, 0.784 y 0.313, respectivamente). Es decir, el volumen de los huevos depende de su secuencia en la puesta, pero no necesariamente del (los) volumen(es) previo(s), por lo que se indica la necesidad de probar tal dependencia y, en consecuencia, el tipo de análisis estadístico a utilizar. Iniversidad Autónoma de Baja California 2002-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/213 10.7773/cm.v28i2.213 Ciencias Marinas; Vol. 28 No. 2 (2002); 205-209 Ciencias Marinas; Vol. 28 Núm. 2 (2002); 205-209 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/213/180 |
| institution |
Ciencias Marinas |
| collection |
OJS |
| language |
eng |
| format |
Online |
| author |
Carmona, R Lozano, E |
| spellingShingle |
Carmona, R Lozano, E Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence |
| author_facet |
Carmona, R Lozano, E |
| author_sort |
Carmona, R |
| title |
Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence |
| title_short |
Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence |
| title_full |
Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence |
| title_fullStr |
Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence |
| title_full_unstemmed |
Independency in the volumes of eggs of the Heerman's gull (Larus heermanni), on base to their clutching sequence |
| title_sort |
independency in the volumes of eggs of the heerman's gull (larus heermanni), on base to their clutching sequence |
| description |
In most birds egg volume has been recorded directly dependant on clutch sequence. Furthermore, the egg size has been also considered as dependent on the size of its predecessor, thus, they are constantly analyzed with non-parametric statistics, given the independency required by the parametric one. We studied the Heermann's gull (Larus heermanni) colony at El Callo Islet (south of San José Island, B.C.S.) during its reproductive season (1996). Twenty-seven nests were followed and identified with plastic flags. The eggs were marked (according to their appearance) and measured (length and width), in order to calculate their volume. The analysis of the volume of 66 eggs showed normality and homocedasticity (in all cases α = 0.05). The volume comparison by clutch sequence evidenced that the first and second eggs were similar, but both differed from third eggs ( x- ± SE: 57.59 ± 1.52, 56.62 ± 1.75 and 52.66 ± 2.48 cm3, respectively). Furthermore, three simple linear correlations were performed (first-second, first-third and second-third), in order to evidenciate the supposed size-dependence on previous eggs. No relationship could be established in either comparisons (r = 0.143, 0.08 and 0.291; d.f.= 23, 14 and 14, P = 0.502, 0.784 and 0.313, respectively). This means that the egg volume depends on the clutch sequence, but not necessarily on the volume of previous eggs, indicating the need of testing such dependency and, consequently, the type of statistical analysis to be used. |
| publisher |
Iniversidad Autónoma de Baja California |
| publishDate |
2002 |
| url |
https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/213 |
| _version_ |
1715723943016398848 |
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