The status and impact of introduced freshwater animals in Singapore

Ng, Peter K. L.; Chou, L. M.; Lam, Theodora

doi:10.1016/0006-3207(93)90379-f

Cited by 67 publications

(37 citation statements)

References 2 publications

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“…Except for a few orders, such as Gastropoda and Decapoda, for which many species have been identified, taxonomic knowledge to the species level of other macroinvertebrate taxa, including Chironomidae, Ephemeroptera, Trichoptera, Odonata, Oligochaeta and Acarina, is limited (Corlett 1992, Ng 1992, Ng et al 1993, Clements et al 2006). The absence of regional macroinvertebrate keys for species-level identification eliminated the possibility of finer taxonomic resolution in the present study.…”

Section: Discussionmentioning

confidence: 99%

Methods for sampling benthic macroinvertebrates in tropical lentic systems

Loke¹,

Clews²,

Low³

et al. 2010

Aquat. Biol.

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Reliable quantitative methods for sampling invertebrate communities are critical for effective freshwater biomonitoring. We tested a range of devices and protocols for sampling benthic macroinvertebrates in shallow tropical lakes; this is the first time this has been attempted in Southeast Asia. First, a pilot study to identify a suitable artificial substrate and colonisation period was conducted. Coconut brushes combined with split palm fronds attracted the greatest macroinvertebrate abundance and richness. A colonisation period of 4 wk was sufficient to capture the key macroinvertebrate families and orders. Second, the sampling efficiencies of 7 artificial substrate sampler designs and 2 hydraulic suction devices were compared in rocky and soft-sediment littoral habitats of a reservoir in Singapore. Among the 9 different sampling techniques tested, the samplers containing coconut brushes and split palm fronds again were the most effective at capturing the greatest total abundance and family richness of benthic macroinvertebrates. Variation in community structure among sampler types was largely explained by the abundance of Chironomidae and Polymitarcyidae (Ephemeroptera). Results were similar between sites dominated by 'rocky' and 'vegetated' littoral habitats. This project identified a sampling device suitable for biomonitoring Singapore's lentic environment, with protocols likely to apply to shallow tropical lentic systems elsewhere.

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Section: Discussionmentioning

confidence: 99%

Methods for sampling benthic macroinvertebrates in tropical lentic systems

Loke¹,

Clews²,

Low³

et al. 2010

Aquat. Biol.

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“…European pond turtles Emys orbicularis; (Lever, 2003)] disrupt food-webs by consuming aquatic vegetation, invertebrates and vertebrates (Ernst, Lovich & Barbour, 1994;Ligon, 2007;Prevot-Julliard et al, 2007) and negatively affect birdlife, for example by drowning eggs while basking in water-bird nests (ISSG, 2006). The RES is native to the Mississippi Valley area, USA, and has established wild populations in several countries, including Australia, Spain, France, Italy, Taiwan, Japan, Guam, among others outside of its native range in North America, (Ng, Chou & Lam, 1993;Chen & Lue, 1998;Bomford, 2003;Lever, 2003;ISSG, 2004;Ficetola, Thuiller & Padoa-Schioppa, 2009). …”

Section: Introductionmentioning

confidence: 99%

Minimizing false‐negatives when predicting the potential distribution of an invasive species: a bioclimatic envelope for the red‐eared slider at global and regional scales

Kikillus

Hare

Hartley

2010

Animal Conservation

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Invasive species threaten biodiversity; hence, predicting where they may establish is vital for conservation. Our aim is to provide a robust predictive model for an invasive species suitable for managers acting at both global and regional scales. Specifically, we investigate one of the world's worst invasive species [the red-eared slider turtle (RES) Trachemys scripta elegans] and one of the world's biodiversity hotspots (New Zealand) as our representative systems. We used climate data and location records to define a bioclimatic envelope for the species. Multimodel inference was used to predict areas suitable for RES establishment, weighting in favour of models with low false-negative and high true-positive rates in predictive cross-validation tests. Our performance criterion was the partial area under the curve of a receiver operating characteristic plot where sensitivity exceeded 0.95. We generated both conservative (best-case scenario) and liberal (worst-case scenario) predictions, based on different levels of information about breeding potential. All predictions were expressed on a standard scale of suitability relative to existing known distribution. Globally, the best climate matches for RES outside of their native range in North America include south-east Asia, and parts of Europe, areas where RES have already established. The best available site in New Zealand is considered climatically more suitable than 16% of global sites where RES have bred successfully. While RES can survive in several areas throughout New Zealand, the potential to establish a self-sustaining (i.e. breeding) population appears restricted to the upper areas of the north island where the mean daily temperatures in the hottest month exceed 18 1C. The methods developed here were designed to reduce false-negative predictions as that represents a precautionary approach for species that pose a biosecurity risk. They could readily be adapted, however, to reduce false-positives when predicting areas suitable for translocation of rare and endangered species.

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“…Though large and conspicuously coloured, C. quadricarinatus was not recorded by numerous earlier surveys and studies of introduced freshwater species in Singapore (e.g. Ng et al 1993;Ng 1999). Therefore, C. quadricarinatus is likely to be a recent introduction, probably becoming feral sometime between the late 1990s and early 2000s.…”

mentioning

confidence: 80%

“…Trade and culture of aquarium species is a prime source of introduced freshwater species in Singapore (Ng et al 1993). Cherax quadricarinatus is not presently cultured for human consumption in Singapore, but in the last decade it has become popular in the aquarium trade.…”

mentioning

confidence: 99%

“…Clearly, in Singapore as with elsewhere, more extensive monitoring is required to assess population size and structure and its environmental impacts. Currently, however, C. quadricarinatus appears to be limited to the open-water habitats of the reservoirs proper, which appear to contain relatively few native species (Ng et al 1993). The native freshwater decapod crustaceans, such as the freshwater prawn Macrobrachium platycheles Ou and Yeo and the endemic freshwater crabs Johora singaporensis Ng, Irmengardia johnsoni Ng and Yang and Parathelphusa reticulata, almost exclusively occupy the shaded, acid-water forest streams and swamps of the forested catchments (Ng 1999).…”

mentioning

confidence: 99%

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