Bleaching of coral in Nha Trang, Ninh Thuan, Con Dao and Phu Quoc islands in June–July 2019

The studies on coral bleaching were conducted at 21 sites of 4 reef areas in Southern Vietnam, using point transect technique in June–July 2019. Cover of hard corals in the selected sites was quite high with the average values of 65.6 ± 18% % in Con Dao islands, 58.7 ± 26.2% in Ninh Thuan coastal waters, 55.9 ± 17.8% in Phu Quoc island but lower in Nha Trang bay (22.8 ± 15.9%). Soft corals were not abundant with the highest cover in Nha Trang bay (4.73 ± 5.5%) and the lowest in Ninh Thuan (0.16 ± 0.3%). Hard corals were most impacted in Nha Trang bay with 39.5 ± 8.1% bleached, followed by Ninh Thuan reefs (32.9 ± 13.3%), Con Dao Islands (25.0 ± 11.1%) and least affected in Phu Quoc island (7.3 ± 9.05%). For soft corals, ratios of bleached corals were 79.4%, 65.8% and 23.8% in Con Dao islands, Nha Trang bay and Ninh Thuan reefs respectively. No bleached soft coral was recorded in Phu Quoc. At the genus level, Acropora corals were severely affected in Nha Trang bay, Ninh Thuan reefs and Phu Quoc island but not impacted in Con Dao islands. The Porites, Montipora, Millepora genera were quite vulnerable in all sites but no bleaching was observed for Galaxea and Diploastrea genera.

Hewan Intersisi di Pantai Takisung Kabupaten Tanah Laut

Intersection animals generally live on sandy shores or wet soil, living permanently by sticking, hiding away, and burrowing at the bottom of waters. The movement of intersection animals is limited to life in and at the bottom of the water, and is very sensitive to changes in the aquatic environment, so it can be used as a bioindicator of a waters. The aim of this research to identify the types and morphology of intersecting animals in Takisung Beach, Tanah Laut Regency. The study uses descriptive survey method with observation techniques for data collection. The research sample is an intersecting animal found in the research plot. The research plot was determined by the 6 point transect, distance of 5 m between points along 1,500 m. Data were analyzed exploratively using relevant libraries. The results showed that the intersection animals found consisted of 15 types namely: Aurelia aurita, Tachypleus tridentatus, Turritella communis, Cassis tuberosa, Oliva sayana, Murex trapa, Urosalpinx cinerea, Urosalpinx perrugata, Neritina violacea, Comarmondia gracilis, Cryptospira ventricosa, Erosaria miliaris, Anadra granosa, Paphia undulata, and Solen vaginalis.

Seabirds At-Sea Surveys: The Line-Transect Method Outperforms the Point-Transect Alternative

Introduction:Knowledge of seasonal distribution and abundance of species is paramount in identifying key areas. Field data collection and analysis must provide best information concerning seabirds at-sea to optimize conservation efforts.Methods:We tested whether modeling of detection probabilities, and density estimates with their coefficients of variation obtained from the point-transect method provided more robust and precise results than the more commonly used line-transect method. We subdivided our data by species groups (alcids, and aerialist species), and into two behavior categories (flyingvs.swimming). We also computed density estimates from the strip-transect and point count methods, to relate differences between transect methods to their counterparts that do not consider a decreasing probability of detection with distance from the observer. We used data collected in the Gulf of St. Lawrence between 2009 and 2010 when observers simultaneously conducted line- and point-transect sampling.Results:Models of detection probability using the line-transect method had a good fit to the observed data, whereas detection probability histograms of point-transect analyses suggested substantial evasive movements within the 0-50 m interval. This resulted in point-transect detection probability models displaying poor goodness of fit. Line transects yielded density estimates 1.2-2.6 times higher than those obtained using the point-transect method. Differences in percent coefficients of variation between line-transect and point-transect density estimates ranged between 0.2 and 5.9.Conclusion:Using 300 m wide line-transects provided the best results, while other methods could lead to biased conclusions regarding species density in the local landscape and the relative composition of seabird communities among species and behavior groups.

Fading sight of endemic Zapornia bicolor (Walden, 1872) in Eastern Himalayan Biodiversity Hotspot

A biosurvey was conducted in Samendu Lake and its surrounding wetlands of Eastern Himalayan Hill region of Mirik in Darjeeling in West Bengal, India. In the study, endemic and locally rare bird species Zapornia bicolor (Walden, 1872) was studied with point transect method regarding its population and habitat. Very low population (only 21 individuals) and habitat degradation (encroachment, pollution, invasive plant species) was observed at the study sites. Conservation measures for this species have been suggested.

Fading sight of endemic Zapornia bicolor (Walden, 1872) in Eastern Himalayan Biodiversity Hotspot

A biosurvey was conducted in Samendu Lake and its surrounding wetlands of Eastern Himalayan Hill region of Mirik in Darjeeling in West Bengal, India. In the study, endemic and locally rare bird species Zapornia bicolor (Walden, 1872) was studied with point transect method regarding its population and habitat. Very low population (only 21 individuals) and habitat degradation (encroachment, pollution, invasive plant species) was observed at the study sites. Conservation measures for this species have been suggested.

Fading sight of endemic Zapornia bicolor (Walden, 1872) in Eastern Himalayan Hotspot

A biosurvey was conducted in Samendu Lake and its surrounding wetlands of Eastern Himalayan Hill region of Mirik in Darjeeling in West Bengal, India. In the study, endemic and locally rare species of Zapornia bicolor (Walden, 1872) was studied with point transect method regarding its population and habitat. Very low population (only 21 individuals) and habitat degradation (encroachment, pollution, invasive plant species) has been observed at the study sites. Conservation measures for this species have been suggested.