Vulnerability of Southwest Iberian amphibians to an introduced crayfish, Procambarus clarkii

Rebelo, Rui; Cruz, Maria João

doi:10.1163/156853805774408577

Cited by 75 publications

(28 citation statements)

References 34 publications

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“…These systems host a fish community of Cyprinidae and introduced exotic species (Prenda et al, 2006), and the introduced red swamp crayfish (Procam barus clark ii) as the most important large aquatic amphibian predators (e.g. Cruz Rebelo, 2005). Depending on the year and the amount of shadow, the rivers can support dense aquatic vegetation with Ranunculus sp.…”

Section: Study Sitesmentioning

confidence: 99%

The importance of fluvial habitats for amphibian conservation in the Mediterranean climate

Vries

Marco

2017

bah

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The importance of standing water habitat for amphibians is widely known and recognized. However, in some arid or semiarid zones the availability of these temporal habitats is uncertain and fluvial habitats could play a very important role for amphibian conservation. For example, in the Mediterranean region many fluvial habitats have a temporary character, lacking predatory fish populations and hosting diverse amphibian communities. To compare the relative importance of various fluvial and still water habitats, we studied the breeding amphibian community over a wide area from 2006 to 2008 in southwestern Spain. All amphibian species found in the area were present in lotic habitats and the highest amphibian diversity was found in temporary stream habitats. Fluvial habitats were among the most important habitats used for reproduction by eight amphibian species of conservation concern, whereas for seven species a significant positive selection was found towards one or several fluvial habitat types as reproduction habitats. The conservation of fluvial habitats including rigorous impact assessments and management programs can be very important for the conservation of endangered amphibians in these semi-arid areas.

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Section: Study Sitesmentioning

confidence: 99%

The importance of fluvial habitats for amphibian conservation in the Mediterranean climate

Vries

Marco

2017

bah

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“…They are reported to feed on plant and animal detritus, macrophytes and live animals such as molluscs, insects, annelids, nematodes, platyhelminthes, tadpoles and fingerlings ( Fig. 2) (Huner and Barr, 1991;Ilhéu and Bernardo, 1993;Gutiérrez-Yurrita et al, 1998;1999;Parkyn et al, 2001;Correia, 2002;Buck et al, 2003;Cruz and Rebelo, 2005).…”

Section: Trophic Ecologymentioning

confidence: 99%

Red swamp crayfish: biology, ecology and invasion - an overview

et al. 2015

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-Alien species have been transported and traded by humans for many centuries. However, with the era of globalization, biological invasions have reached notable magnitudes. Currently, introduction of alien species is one of the major threats to biodiversity and ecosystem functioning. The North American crayfish Procambarus clarkii is one of the most widely introduced freshwater species in the world, especially due to its high economic importance. It is responsible for great modifications in invaded environments causing irreparable ecological and economic damages. Its impressive ability to successfully colonize a wide range of environments is a consequence of its behavioural and biological characteristics that can adapt to features of the invaded location, conferring to this species a notable ecological plasticity. This review summarizes the available information regarding P. clarkii's biology and invasive dynamics around the world in order to contribute to the understanding of the threats posed by its establishment, as well as to support management and impact mitigation efforts.

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“…LODGE et al, 1994;NYSTRÖM et al, 2001;GHERARDI and ACQUISTAPACE, 2007). Laboratory experiments have described their predatory efficiency when offered mollusks, amphibians, and fish (GHERARDI et al, 2001;RENAI and GHERARDI, 2004), and field studies have revealed their ability to prey upon both newt eggs (GAMRADT and KATS, 1996) and the embryos and free swimming larvae of up to 13 amphibian species (CRUZ and REBELO, 2005). Surprisingly, little is known about feeding preferences of introduced crayfish species (FEMINELLA and RESH, 1989;BERNARDO, 1993, 1995;CRONIN et al, 2002), notwithstanding that, by feeding selectively, they may exert a strong negative impact on the most consumed resources, thus contributing to biodiversity loss and promoting the homogenization of the invaded community (WARNER and GREEN, 1995;.…”

Section: Introductionmentioning

confidence: 99%

Feeding Preferences of the Invasive Crayfish, Procambarus Clarkii

Gherardi¹,

Barbaresi²

2007

Bull. Fr. Pêche Piscic.

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This laboratory study analyzes feeding preferences of a crayfish species with high invasive potentials, the red swamp crayfish Procambarus clarkii. We first conducted a series of multiple-choice tests among fresh plants (3 tests, one per each of three seasons, i.e. spring, summer, and autumn) and animals (1 test in summer). In the first tests, crayfish were simultaneously offered fresh pieces of seven plants of different growth forms and taxonomic groups, selected on the basis of their availability in the habitat. In the second test, the offered animals were dead earthworms, rainbow trout fry, and toad tadpoles. Then, a binary choice test was run in autumn between the most preferred plant (Urtica sp.) and earthworms. The percentages of organic C and N contents were measured for each food category using a gas-chromatography technique and the assimilation efficiency of both dry mass and organic content was assessed in a dedicated experiment. The results showed that P. clarkii is selective when offered fresh plants, consuming a relatively larger biomass of Urtica (in the three seasons examined), green algae (in spring), and Polygonum (in summer and autumn). Surprisingly, crayfish did not exhibit preference for any animal prey. Also, P. clarkii's feeding decisions seemed not to be associated with either the availability of plants in the habitat or their occurrence in the gut contents of wild crayfish. Neither did their ingested biomass depend on the organic content or assimilation efficiency. Procambarus clarkii preferred Urtica sp. over earthworms, notwithstanding the higher nutritional value and assimilation efficiency of the latter. The above results might suggest that feeding preferences of the species often depend on factors other than nutritional value and digestibility. Future studies will analyze all the possible factors together in order to unravel the rules that govern feeding preferences in crayfish. In the case of invasive species, such knowledge will highly contribute to planning science-based actions for their containment and mitigation.Key-words: feeding preferences, assimilation efficiency, invasive species, crayfish, Procambarus clarkii. N) a été mesuré pour chaque catégorie d'aliment en utilisant la technique par chromatographie gazeuse et l'efficacité de l'assimilation à la fois de la masse sèche et du contenu organique a été établie à l'aide d'une expérimentation spécifique. Les résultats indiquent que P. clarkii est sélective lorsqu'on lui propose des plantes fraîches, consommant une quantité relativement plus importante d'Urtica (lors des trois saisons examinées), d'algues vertes (au printemps), et de Polygonum (en été et en automne). De façon surprenante, les écrevisses n'ont manifesté de préférence pour aucune des proies animales proposées. De plus, les décisions alimentaires de P. clarkii ont semblé n'avoir aucun rapport avec la disponibilité d'aucune des plantes dans l'habitat ou leur présence dans le contenu stomacal des écrevisses sauvages. Pas plus que la biomasse ingérée n'avai...

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Vulnerability of Southwest Iberian amphibians to an introduced crayfish, Procambarus clarkii

Cited by 75 publications

References 34 publications

The importance of fluvial habitats for amphibian conservation in the Mediterranean climate

The importance of fluvial habitats for amphibian conservation in the Mediterranean climate

Red swamp crayfish: biology, ecology and invasion - an overview

Feeding Preferences of the Invasive Crayfish, Procambarus Clarkii

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