line transect method Research Papers (original) (raw)

This research was about morphometric analysis of macroalgae, density and diversity, located in marine waters of Dara Mara, Anarae Village, Ndao Nuse Sub District, Rote Ndao Regency. This study aims to identify and measure the morphometric, density and diversity of macroalgae. Transect line method using quadrants were used in this study. The results showed that there were 21 macroalgae species consisting of 11 species of Cholorophyta, 3 species of Phaeophyta and 7 species of Rhodophyta. The highest species and relative density of macroalgae were found in Caulerpa species which were 6.8 individuals/m 2 and 51.127%, while the lowest were Codiumedule, Halimeda opuntia, Monostroma nitidum, Dictyota cervicornis, and Padina japonica, which were 0.033 individuals/m 2 and 0.250%. The diversity index were low with the value of H '0.76, while the morphometric analysis of each species showed significant differences in each type of algae, presumably due to differences of environmental factors.

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- Morphometric Analysis, line transect method

Stereo-video scuba transects were conducted during daylight hours from June to September 2013 within a proposed marine protected area (MPA) in the Firth of Clyde, west of Scotland. More juvenile Atlantic cod Gadus morhua of fork length (L F) range 6-11 cm were observed in substrata containing mixed gravel, including maerl, than in boulder-cobble substrata with high algal cover, or sand with low density seagrass. Community composition was significantly different between substratum types. A decrease in G. morhua abundance was observed over the period of data collection. Over time, mean and variance in G. morhua L F increased, indicating multiple recruitment events. Protecting mixed gravel substrata could be a beneficial management measure to support the survival and recruitment of juvenile G. morhua; other substrata might be important at night given their diel migratory behaviour. Stereo-video cameras provide a useful non-destructive fisheries-independent method to monitor species abundance and length measurements.

- by Sophie Elliott and +1
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- Imagery, Scuba Diving, Stereoscopic/3D Video Quality Measurement, Atlantic cod

Nha Trang is a city in Vietnam endowed with several sceneries which has attracted several tourists around the world over the past few decades. The city is highly characterized by coastal features as well as beautiful landscapes. Among these features are; beaches, caves with swift-let birds, resort centers, islands, traditional temples, forts and so on. The act of enhancing economic activities, coupled with some natural factors like; climate change as well as the increasing number of tourists’ over the years has led to the alteration of some of these ecosystems, that gives the city its value, hence, sense of attracting numerous tourists from all walks of life. The Hon Mun Islands are located to the south of Nha Trang Bay. Hon Mun MPA is situated in central - South Vietnam, offshore from the coastal resort city of Nha Trang, Khanh Hoa Province. The name “Hon Mun” (means Black Island) comes from the high and rugged
cliffs forming up caves, particularly black rock here as ebony, very rarely seen elsewhere. Due to the island’s location adjacent to the hot sea-currents from the equator, suitable to the development conditions of corals and various types of tropical sea creatures, the sea bed of Hon Mun is home to an abundant and diverse group of marine species, an interesting and useful place for researchers, oceanographers and tourists to observe and explore more of the sea creatures’ life [1]. It is for these reasons why this study was conducted to delve into the nature, management and threats posed on the ecosystems at the Hon Mun Island at Nha Trang in Vietnam.

- by Isaac Sarfo and +1
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- Tourism Management, Sustainable Development, Marine Protected Areas, Coral Reef Ecosystems