Environmental benefit of different crayfish management strategies in Finland

Kirjavainen, Jorma; Sipponen, M.

doi:10.1111/j.1365-2400.2004.00388.x

Cited by 22 publications

(25 citation statements)

References 2 publications

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“…The North American signal crayfish (Pacifastacus leniusculus (Dana)) is spreading across Europe (Holdich et al, 2009) and is threatening the native biota (Westman et al, 2002;Stenroth and Nyström, 2003). Signal crayfish have been introduced to hundreds of lakes in southern Finland where they are replacing the indigenous noble crayfish (Astacus astacus L.) (Kirjavainen and Sipponen, 2004). The natural distribution of the native crayfish was confined mainly to rivers and the shallow littoral areas (<3 m) of small lakes (Westman et al, 2002), whereas signal crayfish also inhabit deeper sublittoral and profundal areas and have become particularly well established in large lakes (Erkamo et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Invasive crayfish increase habitat connectivity: a case study in a large boreal lake

Ruokonen

Kiljunen

Hämäläinen

2012

Knowl. Managt. Aquatic Ecosyst.

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Key-words:crayfish, habitat connectivity, invasive species, stable isotopes Several studies have shown that distinct compartments of lake ecosystems are coupled via transportation of organic matter, nutrients and energy across habitat boundaries. Here we evaluate the potential of the invasive signal crayfish (Pacifastacus leniusculus (Dana)) to modify energy pathways in large boreal lakes. Using a stable isotope mixing model and calculation of the isotopic niches we estimated the contribution of different food sources to the diets of crayfish captured from different habitats, and from that inferred their potential to transport energy across the littoralprofundal gradient. The crayfish caught from the littoral area utilized mainly littoral food sources, whereas the importance of profundal sources increased consistently with depth. We also found crayfish in deeper habitats with littoral δ 13 C label, which indicates significant use of littoral sources. These results presents evidence that invasive signal crayfish create a new link in energy transfer from littoral areas to profundal areas and thereby increase connectivity between these spatially distinct habitats. Our results highlight a need for better understanding of the role of crayfish in lake energy dynamics and habitat connectivity. RÉSUMÉ L'écrevisse invasive accroît la connectivité des habitats : une étude de cas dans un grand lac boréal Mots-clés :écrevisses, connectivité des habitats, espèce envahissante, isotopes stables Plusieurs études ont montré que les différents compartiments des écosys-tèmes lacustres sont couplés via le transport de la matière organique, de nutriments et de l'énergie à travers les frontières de ces habitats. Ici, nous éva-luons le potentiel de l'écrevisse signal invasive (Pacifastacus leniusculus (Dana)) à modifier les voies de l'énergie dans les grands lacs boréaux. En utilisant un modèle de mélange des isotopes stables et le calcul des niches isotopiques, nous avons estimé la contribution des différentes sources de nourriture pour l'alimentation des écrevisses capturées dans différents habitats, et déduit leur potentiel de transport d'énergie le long du gradient littoral-zone profonde. Les écrevisses capturées dans la zone littorale utilisent des sources alimentaires essentiellement littorales, alors que l'importance des sources de zone profonde augmente de façon régulière avec la profondeur. Nous avons aussi trouvé des écrevisses dans des habitats plus profonds avec une signature δ 13 C du littoral, ce qui indique une utilisation importante des sources littorales. Ces résultats présentent des preuves que l'écrevisse signal invasive crée un nouveau lien dans le transfert d'énergie à partir des zones littorales vers la zone profonde et donc augmente la connectivité entre ces habitats spatialement distincts. Nos résultats mettent en évidence la nécessité de mieux comprendre le rôle de l'écrevisse dans la dynamique de l'énergie d'un lac et la connectivité des habitats.

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Section: Introductionmentioning

confidence: 99%

Invasive crayfish increase habitat connectivity: a case study in a large boreal lake

Ruokonen

Kiljunen

Hämäläinen

2012

Knowl. Managt. Aquatic Ecosyst.

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“…Nowadays the original distribution area of noble crayfish in Finland (Figure 1) is mainly inhabited with signal crayfish populations (Westman, 1991;Kirjavainen and Sipponen, 2004) causing disappearance of the noble crayfish within that region due to the crayfish plague (Viljamaa-Dirks et al, 2013), while the noble crayfish remains as stocked populations in the northern and eastern parts of Finland (Kirjavainen and Sipponen, 2004;Jussila et al, 2015aJussila et al, , 2015b.The introduced alien crayfish species, together with the crayfish plague disease they are carrying, are acting as a constant risk factor that weakens the survival chances of the native European crayfish species. Richman et al (2015) have recently stated that although approximately 30% of the world's crayfish species are threatened, the European crayfish species are facing the greatest number of risks and the invasive crayfish species are one of the main reasons for this situation.…”

Section: Figure 2 Maximum Likelihood (Ml) -Tree Of the Sequenced Coi-mentioning

confidence: 99%

Mitochondrial cytochrome oxidase I gene analysis indicates a restricted genetic background in Finnish noble crayfish(Astacus astacus)stocks

Makkonen

Kokko

Jussila

2015

Knowl. Manag. Aquat. Ecosyst.

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Key-words:noble crayfish, native species, population decline, genetic diversity, cytochrome oxidase IThe IUCN Red List indexes the noble crayfish (Astacus astacus) as vulnerable, with a declining population trend. The main threats to the species are the crayfish plague caused by the oomycete Aphanomyces astaci and the introduced North American crayfish that act as the carriers of this disease. In Finland, the noble crayfish is considered as a native species, which original distribution area covers the southern part of the country, but the species distribution has been dispersed to cover almost the whole country. The aim of this study was to survey the genetic diversity among the Finnish noble crayfish populations. The mitochondrial cytochrome oxidase I (COI)-gene was sequenced from 742 individuals representing 59 populations from Finland and Estonia. As a result, only a single haplotype was found. Based on these results, the genetic diversity of noble crayfish in its Northern distribution range is remarkably low. The observed lack of variation can result from several mechanisms including small size of the founder population and the intense spreading of the species by manmade stockings. The restricted diversity can also be caused by eradication of the original populations due to crayfish plague epidemics and spreading of the invasive crayfish species carrying the crayfish plague. It is also possible that all contemporary Finnish noble crayfish populations originate from stockings with no variation in respect to COI-gene. RÉSUMÉ L'analyse du gène mitochondrial du cytochrome oxydase I indique un fond génétique restreint dans les populations finlandaises de l'écrevisse à pattes rouges (Astacus astacus)

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“…Early experimental introductions, with adult signal crayfish brought from North America, yielded less than impressive results (Westman, 1973;Westman et al, 1999), which lead to intensive development of farming of signal crayfish and mass production of signal crayfish juveniles for stockings in private farms (Kirjavainen and Sipponen, 2004). Preliminary promising research results from some lakes together with success in juvenile production in larger scale (Kirjavainen and Westman, 1994) raised wide public interest on signal crayfish introductions and need for 1st crayfisheries strategy was recognised by fisheries authorities (Kirjavainen and Sipponen, 2004).…”

Section: Discussionmentioning

confidence: 99%

“…Preliminary promising research results from some lakes together with success in juvenile production in larger scale (Kirjavainen and Westman, 1994) raised wide public interest on signal crayfish introductions and need for 1st crayfisheries strategy was recognised by fisheries authorities (Kirjavainen and Sipponen, 2004).…”

Section: Discussionmentioning

confidence: 99%

Introduced alien signal crayfish (Pacifastacus leniusculus) in Finland − uncontrollable expansion despite numerous crayfisheries strategies

Ruokonen

Sjövik

Erkamo

et al. 2018

Knowl. Manag. Aquat. Ecosyst.

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-In Finland, massive signal crayfish introductions started towards the end of 1980s, with an estimated total of 2.2 million signal crayfish been stocked before year 2016. During that period, Finnish fisheries authorities have implemented three national management strategies setting guidelines for the crayfish introductions. The main aims of the strategies have been conservation of native noble crayfish stocks and a controlled spreading of the alien signal crayfish within a designated region. In this study, we report the current distribution of signal crayfish in Finland in comparison to the guidelines set in these three national strategies. The present distribution area of the signal crayfish covers most of the Southern Finland. The signal crayfish has been introduced with a stocking permits to over 480 water bodies. In addition, there have been numerous stockings without permits, which are often next to the region designated for signal crayfish. Based on the results, we conclude that crayfisheries strategies adopted in Finland have only had limited effect on the spread of signal crayfish. We presume that main causes for the uncontrolled spreading of the signal crayfish in Finland have been lack of strict official supervision and general lack of awareness about the risks associated with the alien species spreading.

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Environmental benefit of different crayfish management strategies in Finland

Cited by 22 publications

References 2 publications

Invasive crayfish increase habitat connectivity: a case study in a large boreal lake

Invasive crayfish increase habitat connectivity: a case study in a large boreal lake

Mitochondrial cytochrome oxidase I gene analysis indicates a restricted genetic background in Finnish noble crayfish(Astacus astacus)stocks

Introduced alien signal crayfish (Pacifastacus leniusculus) in Finland − uncontrollable expansion despite numerous crayfisheries strategies

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