Redclaw crayfish (Cherax quadricarinatus): spatial distribution and dispersal pattern in Java, Indonesia

Abstract

Cherax quadricarinatus is a parastacid crayfish native to parts of north-eastern Australia and southern New Guinea. It is a relatively large and highly fecund species in comparison with other crayfish of this genus. Since C. quadricarinatus was previously assessed as an invasive species in Indonesia, further monitoring of this species in this region was recommended. Detailed understanding of its spatial behaviour can be the basis for further research aimed at improved management. Field sampling was performed outside its native range in Java, Indonesia from 2019–2020, resulting in data useful for modelling the species' spatial distribution. The occurrence of the species was confirmed in 66 of 70 surveyed localities with 51 new records for Indonesia. Future investigations focused on the relationship between the spatial distribution and dispersal pattern of C. quadricarinatus and its interactions with native biota and entire ecosystems were recommended.

Multiple invasions and predation: The impact of the crayfish Cherax quadricarinatus on invasive and native snails

“…Several measurements (to the nearest mm), classically used in crayfish studies (Akmal et al., 2021 ; Grandjean et al., 1997 ), were taken, from each captured crayfish to the nearest mm using a digital caliper: the total length (TL), the carapace length (CL), the main claw length (MC), the main claw width (CW) at finger base, and the abdomen width (Abd; Figure S4 ). Crayfish were individually monitored, and each individual was used less than three times in the experiments described next, and never experiencing the same conditions to avoid habituation to experimental tests (Haddaway et al., 2012 ).…”

Detection and Management of Freshwater Invasive Alien Species through Environmental DNA Analysis and Geographic Information Systems: A Review

“…GIS mapping and eDNA analysis have also been integrated by some researchers, namely, for the study of niche modeling to map species habitats [174], the comparison of local-and regional-scale estimations of fish diversity in streams [175], the detection of large, rare river crayfish [176], the discovery of Yamato salamander [50], the evaluation of diversity across a river network [177], and the determination of the spatial distribution and dispersal pattern of redclaw crayfish in Indonesia [41], among other applications. As foreign crayfish species are versatile in terms of diet and exhibit opportunistic behavior that can alter the native ecosystem [178][179][180], the use of GIS data may contribute to improved understanding, as the produced maps and parameters provide a clear view of the specific locations pertaining to targeted crayfish and specific habitats and can also be used for other IAS species.…”

“…As stated by Walton et al [40], studies on IAS might assist in conservation efforts to protect the biodiversity of tropical environments. Together with studies on invasive species distribution in local landscapes, continuous mitigation efforts and aggressive enforcement action should be undertaken to ensure the protection of native species and their biodiversity [41].…”

Review of Marine Invasive Species Distribution Pattern in Indonesia

“…The increase in invasive species can also be beneficial, but it is necessary to consider and predict the impact of introducing a species into the ecosystem [6]. Therefore, the purpose of this invasive species research is to identify invasive species that exist in Indonesia, their distribution locations, and the causes of the entry of these invasive species into Indonesian waters.…”