Determining the Density of Seagrass at Different Substrates

Topics: Seagrass, Cymodoceaceae, Marine biology Pages: 5 (1119 words) Published: April 2, 2013
Background of the Study
Seagrasses are the marine flowering plants. They are the only angiosperms that successfully grow in tidal and subtidal marine environment. Seagrasses belong to the families, Hydrocharitaceae and Potamogetonaceae and they are in no way related to the terrestrial grasses of Poaceae. There are 13 genera and 58 species available all over the world. Of these, six genera (Amphibolis, Heterozostera, Phyllospadix, Posidonia, Pseudalthenia and Zostera) are mostly restricted to temperate seas and the remaining seven genera (Cymodocea, Enhalus, Halodule, Halophila, Syringodium, Thalassia and Thalassodendron) are distributed in tropical seas (L. Kannan, T. Thangaradjou). They grow and reproduce sexually being continuously submerged under water. They do not require contact with air, and the reproductive cycle with flowering and pollination is completed under water. Seagrasses have a number of adaptations to the submerged life form (Borum et al, 2004).

Thalassia hemprichii is common on mud-coral-sand or coarse coral-sand substrates, in sheltered habitats in the Philippines. The plant has been observed growing from the base and through fingers of corals at 6 m deep. T. hemprichii may be found mixed with Syringodium isoetifolium, Cymodocea serrulata, C. rotundata, Enhalus acoroides, Halophila ovalis, and Halodule uninervis (Calumpong et al, 1983).

Locale of the Study
This was conducted at Brgy. San Pedro, Panabo City.

Delimination of the Study
This study was concerned in determining the density of seagrass specifically Thalassia hemprichii at different substrate at Brgy. San Pedro, Panabo City.

In this study, the objective is to determine the present status of Thalassia hemprichii in coastal area at Brgy. San Pedro, Panabo City.
This study specifically aims to:
1. Determine the population density of Thalassia hemprichii in the area; 2. Compare the density of Thalassia hemprichii among the three(3) station

Importance of the Study
Seagrasses are an essential part of the marine environment and are central to a web of life. They stabilise sand and mud banks (keeping water clear) and form the basis of a complex ecosystem supporting forms of life from dugong to plankton. Seagrass ecosystems provide habitats for a wide variety of marine organisms, both plant and animal; these include bacteria, plankton, fish, turtles, and dugongs.

Thalassia hemprichii is one species of seagrass that is common on the study area.


Sampling Area
The study was conducted in the intertidal zone of Brgy. San Pedro, Panabo City.

Sampling Frequency
One shot sampling was used during the gathering of data necessary for the study. The study was conducted on March 6, 2013 during the lowest low tide.

Field Sampling
Sampling will be accomplished with the use of Transect-Quadrat Method. There will be three (3) transect in every site that will be established in the area. It consist of one transect per station with a length of 50m per transect and about 5 quadrats per transects.

Statistical Analysis
Given the table are the population density obtain by three types of substrate at the Brgy. San Pedro, Panabo City with 5 quadrats per substrate. Test whether the mean density of three types of substrate are equal or not at .05 as level of significance.

Substrate Group| Population Density of Thalassia hemprichii | 1| 2| 3| X1 (muddy)| X2(Sandy)| X3(Cralline)|
a| F| k| 21.6| 19.2| 15.2|
b| G| l| 19.2| 18.4| 16.8|
c| H| m| 22.4| 18.4| 24.8|
d| I| n| 19.2| 16.8| 17.6|
oe| J| o| 20| 23.2| 22.4|
TOTAL Density Indv/m2| 102.4| 96| 96.8|
Mean| 20.48| 19.2| 19.26|

STEP 1: Ho : The mean of population density of three substrates are equal
Ha: The mean of population density of three substrates are not equal

STEP 2: α = 0.05


Substrate Group| Population Density of Thalassia...
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