Current limitations of the stone crayfish distribution in Romania: Implications for its conservation status

Pârvulescu, Lucian; Zaharia, Claudia

doi:10.1016/j.limno.2012.07.008

Cited by 22 publications

(13 citation statements)

References 42 publications

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“…The observed stone crayfish decline is most likely driven by multiple factors. In accordance with previous research (Bohl, ; Pöckl and Streissl, ; Pârvulescu and Zaharia, ; Todorov et al ., ) the regression analysis demonstrated high importance of pristine headwater habitats with hard substrates for intact stone crayfish populations. Consequently, intensification of human riparian land‐use adversely affects presence probability and abundance of stone crayfish.…”

Section: Discussionsupporting

confidence: 93%

The decline of endangered stone crayfish (Austropotamobius torrentium) in southern Germany is related to the spread of invasive alien species and land‐use change

Chucholl¹,

Schrimpf

2015

Aquatic Conservation

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1. Declines in populations of stone crayfish (Austropotamobius torrentium) have recently been reported throughout many parts of their range, including southern Germany. To assess the rate of decline and the probable causes, a crayfish survey was conducted in the River Argen catchment, where the species was known to be widely distributed and abundant.2. Using mixed-effects regression analysis, the presence or absence of the species was subsequently correlated with riparian land-use and habitat characteristics. To elucidate the potential role of crayfish plague in stone crayfish decline, the crayfish plague-carrier status of newly discovered alien signal crayfish (Pacifastacus leniusculus) was evaluated using real-time polymerase chain reaction (PCR).3. Twenty-five of the 98 surveyed sites were colonized by stone crayfish, including only 12 of 25 sites with a previous record. The probability of stone crayfish presence was positively correlated with overhanging bank structures and the proportion of broad-leafed woods in riparian buffers. In contrast, high proportions of intensive grassland had a distinct negative effect on the probability of stone crayfish presence, and cropland also tended to decrease the probability of stone crayfish presence. Both land-use forms have significantly increased in the study area within the last decade, signifying an intensification of riparian land-use.4. Plague-carrying signal crayfish were present at two headwater sites. Crayfish plague transmission from highly resistant signal crayfish to highly susceptible stone crayfish has most likely contributed to the decline in stone crayfish, and crayfish plague outbreaks may account for up to 67% of the observed stone crayfish disappearances.5. The present study confirms a marked decline in stone crayfish populations, which is probably driven by the persistent spread of invasive alien species and intensified riparian land-use. Therefore, conservation efforts for stone crayfish should incorporate strategies to prevent and control the spread of invasive, plague-carrying crayfish, and to mitigate pressures from land use.

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Section: Discussionsupporting

confidence: 93%

The decline of endangered stone crayfish (Austropotamobius torrentium) in southern Germany is related to the spread of invasive alien species and land‐use change

Chucholl¹,

Schrimpf

2015

Aquatic Conservation

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“…The dataset was obtained by field investigation of 243 rivers selected around the Romanian Carpathians during the summer season (July and August) between 2014 and 2015 in sites chosen according to the distribution data from Pârvulescu and Zaharia (, ). Crayfish presence/absence was assessed by using daylight hand sampling.…”

Section: Methodsmentioning

confidence: 59%

Flash‐flood potential: a proxy for crayfish habitat stability

et al. 2016

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The strength of a population resides in the resilience of its individuals and is closely related to the stability of its habitat. Stream macro-invertebrates are sensitive to environmental changes concerning habitat stability; thus, they require shelter to prevent drift during severe floods. We propose a novel approach to estimate the impact of flash floods upon the substrate, by introducing a variable named 'flash-flood potential' (FFP), which accounts for the site slope and the average slope of the upstream catchment. We investigate the impact of this variable on the distribution of two important crayfish species, Austropotamobius torrentium and Astacus astacus, in Romania. We focus on the connection between crayfish abundance and FFP, and also on the role of the individuals' body size in shelter allocation, considering shelter stability as a key factor in coping with the disturbances. The results show that both species are sensitive to influence of the FFP, A. torrentium apparently having a slight advantage. The size of populations visibly decreased with the increase of FFP, those in the upper range having few individuals, which were mainly found in very stable shelters. Individual analyses reveal that the most durable shelters were generally occupied by the largest crayfish. We hypothesize that the competition for shelter is an indirect driver for preventing the drift of crayfish populations.

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“…Although many populations of the species declined across its range, ongoing astacological research confirmed its wider presence in Bosnia and Herzegovina (Trožić-Borovac, 2011), Serbia, and Montenegro (Simić et al, 2008), as well as in Germany (Groß et al, 2008;Martin et al, 2008a). Substantial number of additional records has been also provided for previously underrepresented Romania (Pârvulescu and Zaharia, 2012;Pârvulescu et al, 2013), and the presumed original range of stone crayfish has been expanded to cover the Carpathian Arch there. All bulgarian Natura 2000 localities were recently investigated for presence of stone crayfish by Todorov et al (in press).…”

Section: > Austropotamobius Torrentium (Schrank 1803); Stone Crayfismentioning

confidence: 99%

Continental-wide distribution of crayfish species in Europe: update and maps

Kouba

Petrusek

Kozák

2014

Knowl. Managt. Aquatic Ecosyst.

272

312

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Key-words: crayfish distribution, indigenous species, invasive species, native range, mapsRecently published astacological studies substantially improved available data on distribution of crayfish in various European regions. At the same time, spread of invasive species has been recorded, additional nonindigenous species became established in various countries, and losses of populations of native species due to crayfish plague and other negative factors were observed. We overview recent advances in this knowledge, and provide updated colour maps of the distribution of all crayfish species present in Europe. These maps are originally based on the data from the Atlas of Crayfish in Europe published in 2006 as a result of the CRAYNET project, and were further updated from more recently published reports, grey literature, and especially thanks to contributions and feedback of over 70 specialists from 32 countries. Separate maps are available for all indigenous crayfish species in Europe as well as for three most widespread non-indigenous crayfish species. Additionally, two maps give locations of known findings of crayfish species introduced to Europe after 1980. These newly established alien species have so far restricted distributions; however, the frequency of recent reports suggests that findings of such species resulting from releases of aquarium pets will further increase. RÉSUMÉ Répartition à l'échelle continentale des espèces d'écrevisses en Europe : mises à jour et cartes Mots-clés :distribution des écrevisses, espèces indigènes, espèces envahissantes, Les études astacologiques récemment publiées ont sensiblement amélioré les données disponibles sur la distribution des écrevisses dans les différentes régions européennes. Dans le même temps, la propagation des espèces envahissantes a été enregistrée, des espèces non indigènes supplémentaires se sont établies dans différents pays, et des pertes de populations d'espèces indigènes en raison de la peste des écrevisses et d'autres facteurs négatifs ont été observées. Nous synthétisons les progrès récents dans la connaissance, et fournissons des cartes en couleur mises à jour de la distribution de toutes les espèces d'écre-visses présentes en Europe. Ces cartes sont à l'origine basées sur les données de l'Atlas des écrevisses en Europe publié en 2006 à la suite du projet CRAYNET, et ont ensuite été mises à jour à partir des études publiées plus récemment, de la

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Current limitations of the stone crayfish distribution in Romania: Implications for its conservation status

Cited by 22 publications

References 42 publications

The decline of endangered stone crayfish (Austropotamobius torrentium) in southern Germany is related to the spread of invasive alien species and land‐use change

The decline of endangered stone crayfish (Austropotamobius torrentium) in southern Germany is related to the spread of invasive alien species and land‐use change

Flash‐flood potential: a proxy for crayfish habitat stability

Continental-wide distribution of crayfish species in Europe: update and maps

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