[논문]Morphometrics of Scinaia latifrons (Nemaliales, Rhodophyta) in the Southwestern Gulf of California, Mexico

Leon-Cisneros, Karla; Riosmena-Rodriguez, Rafael

doi:10.4490/algae.2005.20.1.031

Morphometrics of Scinaia latifrons (Nemaliales, Rhodophyta) in the Southwestern Gulf of California, Mexico 원문보기

Algae, v.20 no.1, 2005년, pp.31 - 36

Leon-Cisneros, Karla (Programa de Investigacion en Botanica Marina, Departmento de Biologia Marina, Universidad Autonoma de Bja California Sur) , Riosmena-Rodriguez, Rafael (Programa de Investigacion en Botanica Marina, Departmento de Biologia Marina, Universidad Autonoma de Bja California Sur)

Abstract ▼ AI-Helper

Scinaia latifrons Howe occurs in rhodolith beds between 9 to 27 m depths at San Lorenzo channel, Gulf of California, Mexico. As very little was known about the morphometrics of this normally temperate species in a subtropical area, we investigated the phenological changes from December 1998 to December 1999. The gametophytic phase of the species was present from late February to late May, which represented a shorter time period to other known species in the genus. Our results suggested that two gametophytic cohorts develop over winter and early spring based on the size class structure of the frond height. Thalli became reproductively mature at a small size (1-2 cm in height) and all the plants were monoecious. Scinaia latifrons at the study location underwent allometric growth, indicated by the lack of correlation between size, width of the plants, or branching patterns.

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2003). We hypothesized that the life span of the gametophytic phase would be temporally restricted in this subtropical area in relation to other species in the genus in temperate areas.

제안 방법

Sampling of Scinaia was undertaken at 12-13 m depths in San Lorenzo Channel (110° 20’ W; between 24° 25’ and 24° 20’ N), from December 1988 to December 1999. During the first six months sampling was undertaken every two weeks and, after the gametophytic phase disappeared, every month were looking for the sporophyte and protonemal gametophyte phases. During each visit, two random sites were selected around the south channel buoy marker (see Fig.
The aims of the present study were therefore to: (1) determine the major morphometrical changes (frond height, apical and middle width) in the gametophytic phase of Scinaia latifrons; (2) determine the density of plants over time; (3) determine the plant size in where reproductive maturity is attained.
To construct the size class intervals from the histograms, we calculated the mean increment in length between two dates and the overall increment of all dates. The results were very consistent using both methods for all measured structures (2.0 cm for height, 0.5 cm for apical width and 0.20 cm for median width).

대상 데이터

All mature plants were examined microscopically to evaluate the ratio of male to female individuals. Voucher materials were deposited in the Herbarium of UABCS [FBCS] with the catalog numbers 7243-7247.

데이터처리

Normality and homoscedasticity were evaluated for all the measurable information (height, apical and middle width) collected by Kolmogorov-Smirnov and by Cochran test (Zar 1996). Non-normality of some months was detected (even after transformation), but homoscedasticity was met, in this case robustness of the analysis was assumed (Zar 1996) and a one way (time) ANOVA Model I was performed. Once any significant differences were detected, we used an a posteriori Tukey test.

성능/효과

7 main branches per frond; thus we obtained 336 data points per measured structure (height, middle and apical width) over the 5 dates. Because of small plant numbers, to test independence a one way ANOVA was performed to establish if fronds can be used as a basic unit, the analysis showing marked differences between height frond (p < 0.05). We calculated the mean and standard deviation of frond per date during the period of study.
The growing season of the gametophyte phase of Scinaia latifrons as found during this study was shorter than those reported for other species of the genus and for species of closely related genera (Table 1). This shorter growing season is probably due to the environmental stresses that are found in the southwestern Gulf of California and because S.

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DOI : 10.4490/ALGAE.2005.20.1.031 [무료]
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