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dc.contributor.authorTorres, Pedro J. (P. J.)
dc.contributor.authorMacias, Nicholas A.
dc.contributor.authorColón-Gaud, Checo
dc.date.accessioned2021-09-03T15:49:36Z
dc.date.available2021-09-03T15:49:36Z
dc.date.issued2021-03-08
dc.identifier.citationMacias NA, Torres PJ, ColónGaud C (2021) Records of the Australian redclaw crayfish Cherax quadricarinatus (von Martens, 1868) on the island of Puerto Rico. BioInvasions Records 10(2): 348–359, https://doi.org/10.3391/bir.2021.10.2.13en_US
dc.identifier.issn2242-1300
dc.identifier.urihttps://dspace.allegheny.edu/handle/10456/52783
dc.description.abstractThe redclaw crayfish, Cherax quadricarinatus (von Martens, 1868), a tropical freshwater crayfish endemic to Northern Australia and Southern Papua New Guinea, was introduced to the island of Puerto Rico in the late 1990’s. Redclaw has established populations within man-made reservoirs and ponds across the island, where impoundments have impeded the migration and recruitment of native decapods, potentially opening niche space for the redclaw. We present a case study focused on documenting the presence/ absence, sex ratio, size class, and standing stock biomass of redclaw populations from six reservoirs (Carraízo, Cidra, Carite, Güajataca, El Guineo, Dos Bocas), as well as from various holding ponds of an aquaculture facility (Caribe Fisheries) located near the town of Lajas in the southwestern part of the island where the crayfish are considered pests. Crayfish were detected in 5 out of the 7 sample locations (Carraízo, Cidra, Carite, Güajataca, and Caribe Fisheries). A total of N = 150 crayfish were caught during sampling, with 91% being adults (N = 136) and sex counts resulting in a 0.81 male to female ratio. Standard Carapace Length (SCL) ranged from 16 mm (Güajataca) to 82 mm (Carraízo). No significant difference in SCL was found between adult males (48.32 mm ± 1.62 SE) and females (48.17 mm ± 1.47 SE) (F(1,134) = 0.81, P = 0.37), as well as between SCL in M:F ratio among sample sites (F(4,134) = 0.84, P = 0.50). However, a significant difference in total mean SCL among sample sites was found (F(4,134)= 16.96, P < 0.0001). A post-hoc Tukey-Kramer test indicated that individuals in Carraízo, located close to the area of initial redclaw introduction into the headwaters of the Loiza River, had the largest mean SCL (61.38 mm). Mean standing stock biomass per individual ranged from 1.46 g (Güajataca) to 9.71 g (Carraízo). These biomass estimates provide the first insight into the energy supplements that redclaw provides to higher trophic levels (e.g. predatory fish) in these reservoirs. Furthermore, with populations of native decapods having been completely extirpated from most impounded watersheds, introduced redclaw could fill in the empty niche space by processing organic matter and by providing a direct consumption item to recreational fish species. This could reestablish the missing links in the cycling of nutrients and transfer of energy within reservoirs.en_US
dc.description.sponsorshipThis project was funded in part by National Science Foundation grants DGE 0841146 and DEB 1139899.en_US
dc.language.isoen_USen_US
dc.publisherRegional Euro-Asian Biological Invasions Centre (REABIC)en_US
dc.relation.ispartofBioInvasions Recordsen_US
dc.relation.isversionofhttps://www.reabic.net/journals/bir/2021/Issue2.aspxen_US
dc.rightsCC BY 2.0en_US
dc.subjectdecapoden_US
dc.subjectsecondary productionen_US
dc.subjectinvasiveen_US
dc.subjectecological impactsen_US
dc.subjectfisheriesen_US
dc.subjectCaribbeanen_US
dc.titleRecords of the Australian redclaw crayfish Cherax quadricarinatus (von Martens, 1868) on the island of Puerto Ricoen_US
dc.description.versionPublished articleen_US
dc.contributor.departmentBiologyen_US
dc.citation.volume10en_US
dc.citation.issue2en_US
dc.citation.spage348en_US
dc.citation.epage359en_US
dc.contributor.avlauthorTorres, Pedro J. (P. J.)


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