Loss of diversity and degradation of wetlands as a result of introducing exotic crayfish

Rodríguez, Carlos; Bécares, Eloy; Fernández‐Aláez, Margarita; Fernández‐Aláez, Camino

doi:10.1007/1-4020-3870-4_7

Cited by 53 publications

(67 citation statements)

References 36 publications

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“…Another possible impact of crayfish on river shrimp populations is the loss of habitats, since we proved that river shrimp densities are directly correlated to vegetation cover and crayfish are often responsible for the disappearance of aquatic vegetation leading to habitat loss (Rodríguez et al, 2005). Several studies in the Iberian Peninsula (Anastácio and Marques, 1997;Vila-Escalé et al, 2002;Rodríguez et al, 2005) showed that, even at low densities (up to 1 individual·m −2 ), crayfish can severely affect vegetation.…”

Section: Discussionmentioning

confidence: 50%

Interactions between invasive crayfish and native river shrimp

Banha

Anastácio

2011

Knowl. Managt. Aquatic Ecosyst.

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Key-words:interaction, Athyaephyra desmarestii, Procambarus clarkii, predation, habitat use In the south of Portugal there are only two species of strictly freshwater decapods: the native freshwater shrimp Atyaephyra desmarestii and the exotic crayfish Procambarus clarkii. The aim of this study is to understand if the exotic crayfish acts as river shrimp predator and if both species share the same type of microhabitat. We performed laboratory experiments to study predation and conducted field work in the river Sorraia to verify the microhabitat distribution of both species. Laboratory experiments demonstrated significant predation on river shrimp for crayfish with a cephalothorax length (CT) over 24 mm. The average daily consumption increases with crayfish CT to a maximum of 0.8 shrimps at 44 mm. Field work confirmed that both species share the same microhabitats although with small differences e.g. on the water quality variables such as conductivity and the percentage of oxygen saturation. These microhabitats are shallow pools with abundant aquatic vegetation with no preference for the type of substrate. In the field, both crayfish density and its cephalothorax length are negatively correlated with shrimp densities. In conclusion, P. clarkii can predate A. desmarestii and the major impacts are expected at high densities of large sized crayfish. RÉSUMÉ Interactions entre écrevisse invasive et crevette native en rivière Mots-clés :interaction, Athyaephyra desmarestii, Procambarus clarkii, prédation, habitatDans le sud du Portugal, il n'y a que deux espèces de décapodes strictement d'eau douce : la crevette indigène d'eau douce Atyaephyra desmarestii et l'écrevisse exogène Procambarus clarkii. Le but de cette étude est de comprendre si l'écrevisse exogène agit comme prédateur de la crevette et si les deux espèces partagent le même type de microhabitat. Des expériences de laboratoire ont été réalisées pour étudier la prédation et des travaux sur le terrain dans la rivière Sorraia pour vérifier la distribution des microhabitats des deux espèces. Les expé-riences de laboratoire montrent une prédation significative sur la crevette palomète par l'écrevisse dont la longueur du céphalothorax (CT) est supérieure à 24 mm. La consommation moyenne journalière augmente avec la taille CT de l'écrevisse jusqu'à un maximum de 0,8 crevette à 44 mm. Le travail de terrain confirme que les deux espèces partagent les mêmes microhabitats bien qu'avec de petites différences concernant des variables de qualité des eaux comme la conductivité et le pourcentage de saturation en oxygène. Ces microhabitats sont des calmes peu profonds avec une abondante végétation aquatique sans préférence pour le type

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Section: Discussionmentioning

confidence: 50%

Interactions between invasive crayfish and native river shrimp

Banha

Anastácio

2011

Knowl. Managt. Aquatic Ecosyst.

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“…For example, in Southern Europe, the invasive Louisiana Red Claw Crayfish Procambarus clarkii has been reported the main prey of several piscivorous species, including otters (e.g., Beja, 1996) and birds (Rodríguez et al, 2005). In Portugal, P. clarkii predation by otters was more intense in spring, summer and autumn than in winter, and was directed towards larger and heavier individuals (Correia, 2001).…”

Section: Introductionmentioning

confidence: 99%

Importance of small fishes and invasive crayfish in otter Lutra lutra diet in an English chalk stream

Britton

Berry

Sewell

et al. 2017

Knowl. Manag. Aquat. Ecosyst.

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-The diet composition of the European otter Lutra lutra was assessed using spraint analysis in the Hampshire Avon, a lowland chalk stream in Southern England, over an 18-month period. Small cyprinid fishes were the main prey item taken in all seasons, with bullhead Cottus gobio and stone loach Barbatula barbatula also important; there were relatively few larger fishes of interest to fisheries found. There were significant seasonal differences in diet composition by season, with signal crayfish Pacifastacus leniusculus only being prominent prey items in warmer months and amphibians in winter, revealing that non-fish resources were seasonally important dietary components. Reconstructed body lengths of prey revealed the only species present in diet >350 mm was pike Esox lucius. These dietary data thus provide important information for informing conservation conflicts between otters and fishery interests.Keywords: otter spraint / Barbus barbus / angling / conservation conflict Résumé -Importance des petits poissons et des écrevisses envahissantes dans le régime alimentaire de la loutre Lutra lutra dans une rivière calcaire anglaise. La composition du régime de la loutre Lutra lutra a été évaluée à l'aide d'une analyse des épreintes dans le Hampshire Avon, un cours d'eau calcaire de plaine dans le sud de l'Angleterre, sur une période de 18 mois. Les petits poissons cyprinidés ont été les principales espèces de proies prises en toutes saisons, avec le chabot Cottus gobio et la loche franche Barbatula barbatula également fréquents ; il y avait relativement peu de plus grands poissons d'intérêt pour les pêcheries. Il y avait des différences saisonnières significatives dans la composition de régime, avec l'écrevisse signal Pacifastacus leniusculus n'étant qu'une proie fréquente pendant les mois les plus chauds et les amphibiens en hiver, révélant que les ressources autres que le poisson étaient des composants alimentaires saisonnièrement importants. Des longueurs de proies reconstituées ont révélé que la seule espèce de taille >350 mm présente dans le régime était le brochet Esox lucius. Ces données alimentaires fournissent donc des connaissances importantes pour informer les conflits de conservation entre les loutres et les intérêts de pêche.

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“…Non-indigenous freshwater crayfish species (NICS) may out-compete indigenous crayfish species (ICS) and severely disturb indigenous ecosystem functioning. For instance, the invasive crayfish Procambarus clarkii degraded shallow, macrophyte-dominated lakes in Spain within a few years (Rodríguez et al, 2005). In Europe, only four to five species of crayfish are indigenous, whereas ten NICS have become established during the last 130 years (Souty-Grosset et al, 2006;Holdich et al, 2009;Chucholl and Pfeiffer, 2010).…”

Section: Introductionmentioning

confidence: 99%

Understanding invasion success: life-history traits and feeding habits of the alien crayfishOrconectes immunis(Decapoda, Astacida, Cambaridae)

Chucholl

2012

Knowl. Managt. Aquatic Ecosyst.

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In the present study, the life history and diet of the highly successful North American invader Orconectes immunis was assessed for the first time in its introduced European range. In 2007, O. immunis population dynamics were monitored in a typical backwater habitat using unbaited funnel traps, and its life history was analysed using Von Bertalanffy's growth function. Juveniles hatched as early as March and may attain sexual maturity at the end of their first summer. The adult population moulted up to four times during the summer months, with the non-breeding form (II) lasting for a remarkably short time period. The high growth rate of O. immunis was combined with a short longevity, which was estimated at 2.5 years. The fecundity ranged from 119 to 495 pleopodal eggs. The stomach contents were dominated by detritus, followed by macroinvertebrates and macrophytes, and no ontogenetic shift in diet was observed. The ability to prey on a wide array of invertebrate taxa presumably supports the sustained high growth rate of O. immunis. The presented data provide evidence that O. immunis exhibits a strongly r-selected life history and omnivorous feeding habits. These ecological properties have often been linked to successful invaders and enhance the invasiveness of O. immunis.

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Loss of diversity and degradation of wetlands as a result of introducing exotic crayfish

Cited by 53 publications

References 36 publications

Interactions between invasive crayfish and native river shrimp

Interactions between invasive crayfish and native river shrimp

Importance of small fishes and invasive crayfish in otter Lutra lutra diet in an English chalk stream

Understanding invasion success: life-history traits and feeding habits of the alien crayfishOrconectes immunis(Decapoda, Astacida, Cambaridae)

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