Ratcha Chaichana

• Kasetsart University

As a result of the increasing threats posed by non-native species invasions, there has been a rise in the demand for decision support tools that can more efficiently identify those non-native species likely to become invasive. As part of the risk screening (first) step in the environmental risk analysis process, three multilingual decision support...

Wastewater originating from the Phetchaburi municipality undergoes treatment in a series of five distinct stages at the King’s Royally Initiated Leam Phak Bia Environmental Research and Development Project (LERD) in Phetchaburi province, Thailand. These stages involve a sedimentation (pond 1), three oxidation ponds (ponds 2 to 4), and a final stabi...

Under the increasing threat to native ecosystems posed by non-native species invasions, there is an urgent need for decision support tools that can more effectively identify non-native species likely to become invasive. As part of the screening (first step) component in non-native species risk analysis, decision support tools have been developed fo...

This study examines zooplankton assemblage structure and density from five hypereutrophic urban shallow lakes between cool and hot periods in 2018-2019. We analyzed the variation of zooplankton and their relationship with environmental factors. Samples of zooplankton were collected from shallow lakes in different regions of Thailand. Four groups of...

Bryozoans are mostly sessile colonial invertebrates that inhabit all kinds of aquatic ecosystems. Extant bryozoan species fall into two clades with one of them, Phylactolaemata, being the only exclusively freshwater clade. Phylogenetic relationships within the class Phylactolaemata have long been controversial owing to their limited distinguishable...

Background: The solely freshwater inhabiting Phylactolaemata is a sister taxon to all other bryozoans. Among phylactolaemates, Lophopodidae represents an early branching clade that is therefore crucial for ground pattern reconstruction. While more recent morphological data of most phylactolaemate families are present, data of lophopodids are scarce...

Electronic decision-support tools are becoming an essential component of government strategies to tackle non-native species invasions. This study describes the development and application of a multilingual electronic decision-support tool for screening terrestrial animals under current and future climate conditions: the Terrestrial Animal Species I...

The wastewater treatment ponds of the King’s Royally Initiated Laem Phak Bia Environmental Research and Development (LERD) Project in west-central Thailand provide habitats for freshwater bryozoans, which are colonial invertebrate animals. Bryozoans sieve food particles out of the water using a retractable lophophore and can play an important ecolo...

The sustainability level of current rice farming practices in Thailand was assessed based on in-field data from interviewing 2000 farmers covering six rice varieties and their different production systems. Data were collected on farmers’ characteristics and farming activities according to the 41 requirements of the Sustainable Rice Platform (SRP) s...

The threat posed by invasive non-native species worldwide requires a global approach to identify which introduced species are likely to pose an elevated risk of impact to native species and ecosystems. To inform policy, stakeholders and management decisions on global threats to aquatic ecosystems, 195 assessors representing 120 risk assessment area...

1. Global trade in non-native ornamental species coupled with high connectivity amongst countries is well known to result in worldwide biological invasions, which pose challenges for the conservation and management of biodiversity. 2. There are few studies aimed at implementing management strategies that have examined differences in the potential i...

Eutrophication is one of the main water pollution problems, which occurs throughout Thailand. This research focused on the use of glutinous rice straw (RD-Six) extract and water hyacinth to reduce nutrients and to inhibit phytoplankton growth in hypereutrophic water. In this research, we used (1) control without glutinous rice straw extract and wat...

Environmental changes due to non-native species introductions and translocations are a global concern. Whilst understanding the causes of bioinvasions is important, there is need for decision-support tools that facilitate effective communication of the potential risks of invasive non-native species to stakeholders. Decision-support tools have been...

Environmental changes due to non-native species introductions and translocations are a global concern. Whilst understanding the causes of bioinvasions is important, there is need for decision-support tools that facilitate effective communication of the potential risks of invasive non-native species to stakeholders. Decision-support tools have been...

Alien fishes are regarded as one of the major causes of the decline of aquatic fauna and biodiversity. Up to now, more than 500 fish species have been introduced into China from other countries. However, nationwide documentation of the established alien fishes is still lacking, and their ecological risk is unclear. We compiled a comprehensive inven...

This research investigated the lead contents of the water, sediment and freshwater organisms around an abandoned mining area in Kanchanaburi province, western Thailand. Samples were collected in 2017 during the monsoon season from three zones (upstream or control, middle-stream or inferred source and downstream or impacted zone) of Khli Ti creek. W...

Life Cycle Assessment (LCA) of Hom Mali organic rice production in Surin province, Thailand was performed to evaluate the potential environmental impacts. The scope of study was the farm gate and the functional unit was set as one kg of organic paddy rice. The inputs and outputs were collected from the farm's data recording including the measuremen...

Nutrient enrichment caused by anthropogenic activities can positively affect biological invasions as novel species can utilize additional resources in the ecosystem for population persistence. Although the effect of resource availability on plant invasions has been well-documented, the impact of nutrient enrichment on fish invasions remains unexplo...

To gain more scientific understanding concerning Crayfish in tropical climate since its first introduction in 1987, this research focused on perceptions of nonnative species trading and invasive species as it relates to management. Pet-store owners and farmers were interviewed. There are two Crayfish species in Thailand—Procambarus clarkii and Cher...

Intense phytoplankton blooms often occur in the oxidation ponds of the Laem Phak Bia Environmental Research and Development Project (LERD Project) royally initiated by His Majesty the King in Petchburi Province, Thailand. It is of concern that the bloom phytoplankton species may produce toxins that can cause illness in both humans and wildlife. The...

4. VALUING ECOSYSTEM SERVICES IN INLAND FISHERIES AND FRESHWATER AQUACULTURE IN NORTH AMERICA, ASIA AND AFRICA 4.1 Objectives of the case studies and overview of systems The goal of the case studies is to assess how, and to what extent, the supply of ecosystem services and benefits associated with inland capture fisheries, freshwater aquaculture an...

The success of aquatic invasive species such as golden apple snails may be due to the fact that they are very adaptive and can live in wide range of environmental conditions. In contrast, native fauna such as Thai apple snails, which are less locally adaptive than exotic species, are gradually disappearing from their native ecosystems. This study i...

The toxicity, bioaccumulation and biomagnification of material containing silver nanoparticles were studied in a model food chain. Two forms of silver namely, Ag⁺ and nano Ag° particles (AgNPs) were examined for their toxicity effects on Chlorella sp., Moina macrocopa, Barbonymus gonionotus and Chironomus spp. The results showed that the toxicity o...

The aims of this study were to compare food consumption, growth rates, time to reach food, and food preferences of the golden apple snail (Pomacea canaliculata) and the Thai native snail (Pila scutata). The eggs of the two species collected from natural habitats were hatched in the laboratory. Snails of one month were raised together and separately...

Boraphet marsh, the biggest shallow lake of Thailand, provides an important protein source and income for people in the upper north central region and provides a significant habitat for aquatic flora and fauna. The lake is divided into two zones including the strictly non-fishing and fishing zones with the main purposes of conserving rich biologica...

Native to Latin America, the sailfin armored catfish Pterygoplichthys has been introduced to Thailand for the ornamental fish industry. This invasive species has flourished in nature and may threaten aquatic resources, especially of indigenous freshwater fish due to its foraging activities. This study investigated the biological impacts of the sail...

A species of Neotropical suckermouth armored catfish (family Loricariidae), tentatively identified as the Amazon sailfin catfish Pterygoplichthys pardalis, is a highly invasive, non-native species in Southeast Asia. In Thailand, the spread of P. pardalis is an increasing concern because of the possibility that these non-native catfish are negativel...

From 2005 to 2007, we established bird-proof enclosures in a small, shallow and semi-permanent lake, lacking fish, at Brown Moss, Shropshire, UK, to investigate the effects of aquatic birds on seasonal growth of submerged and emergent macrophytes. The highest density of birds on the lake was in winter (110 individuals ha(-1)) and the lowest in summ...

Brown Moss is a Site of Special Scientific Interest in north-west England, of significance because of the occurrence, at least in the past, of the rare plant Luronium natans (Linnaeus) on the one hand, and its public popularity on the other. It is also a part of Ramsar site that comprises several other water bodies, the Meres, collectively valued f...

Invasive non-indigenous aquatic flora and fauna have become increasingly common in Thailand, threatening the country's ecosystems and biological resources. A species of Neotropical suckermouth armored catfish (family Loricariidae), tentatively identified as the Amazon sailfin catfish Pterygoplichthys pardalis Castelnau 1855, is established in Thail...

Sources of nitrogen and phosphorus were measured for a small pool, Brown Moss, which is a Site of Special Scientific Interest in the UK. The site is designated for its macrophyte and bird interest and comprises several pools flanked by heath and woodland. Currently the largest pool has high mean concentrations of total N and P (4±2.4mgNl−1 and 389±...

Laboratory feeding observations confirm that the golden apple snail (Pomacea canaliculata Lamarck, 1822) is a voracious predator of phylactolaemate bryozoans. An invasive species in Southeast Asia since the early 1980s, the snail now occupies most freshwater ponds, lakes, and rivers throughout the region. Despite the absence of baseline data, it ap...