The Dynamics of Crayfish and Their Role in Ecosystems

Momot, Walter T.; Gowing, Howard; Jones, Patricia D.

doi:10.2307/2424930

Cited by 255 publications

(141 citation statements)

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“…In Astacus astacus, development of glair glands depends on the female's nutritional status (ACKEFORS, 1999) and we suppose that A. torrentium follows the same pattern. As in the studied Croatian populations females developed glair glands at smaller size, we could suppose that this is either because conditions in streams favour faster attainment of optimal nutritional status, or because populations were regenerating and growing, so sexual maturity was reached earlier and at smaller size, as to compensate for population fluctuations or some forms of environmental stress (MOMOT, GOWING and JONES, 1978;MOMOT, 1993;KULESH, ALEKNOVICH and ABLOV, 1999;REYNOLDS, 2002).…”

Section: Resultsmentioning

confidence: 95%

The Relationship Between Female Size and Egg Size in the Freshwater Crayfish Austropotamobius Torrentium

Maguire

Erben

2005

Bull. Fr. Pêche Piscic.

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The aim of our research was to gather information about the reproduction cycle of Austopotamobius torrentium in Croatia. The research was conducted between October 1998 and April 2000 in streams on the Medvednica Mountain (north-west Croatia). We caught 767 females, of which 92 (11.99%) were berried. Berried females were captured from the beginning of November until mid June of the following year. Total length (from the tip of the rostrum to the end of telson) of the smallest female with pleopodal eggs was 5.40 cm, while the longest was 8.70 cm. Diameter of pleopodal eggs varied from 0.24 cm to 0.34 cm (mean ± SD = 0.28 ± 0.02) and their number per female from 1 to 104. Correlations between female size (total length and weight), number of pleopodal eggs and egg diameter were done. We found positive correlation between female length and number of eggs (r = 0.46) and between female length and egg diameter (r = 0.29), as well as between female weight and egg number (r = 0.50) and female weight and egg diameter (r = 0.30). Weak positive correlation was recorded between number of eggs and their diameter (r = 0.06).Key-words: stone crayfish, Austropotamobius torrentium, fecundity, egg size. RELATION ENTRE LA TAILLE DES FEMELLES ET LEURS OEUFS CHEZ L'ÉCREVISSE AUSTROPOTAMOBIUS TORRENTIUM RÉSUMÉ

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Section: Resultsmentioning

confidence: 95%

The Relationship Between Female Size and Egg Size in the Freshwater Crayfish Austropotamobius Torrentium

Maguire

Erben

2005

Bull. Fr. Pêche Piscic.

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“…Sub-yearlings of A. pallipes at both White Lake and Lisheens consumed some 80-85% animal matter, compared with 65% in Pacifastacus (MASON, 1975). In White Lake, plant matter occurred in only 25% of sub-yearlings, whereas WESTMAN et al (1986) reported 40% in A. astacus summerlings in Finnish rivers and MOMOT, GOWING and JONES (1978) noted 100% plant occurrence in Orconectes virilis of the same age.…”

Section: Discussionmentioning

confidence: 97%

“…Young Orconectes virilis would appear to filter-feed, as pine pollen and diatoms formed an important part of their diet in Michigan (MOMOT, GOWING and JONES, 1978), while diatoms were also seasonally important for O. propinquus (SAFFRAN and BARTON, 1993). THOMAS (1979) considered that filter-feeding was the dominant mode of food collection in second to fourth stage hatchlings of A. pallipes, but the results here indicate that young crayfish may feed by catching rather than by filtering.…”

Section: Discussionmentioning

confidence: 99%

Dietary Patterns in Stream- And Lake-Dwelling Populations of Austropotamobius Pallipes

Reynolds

O'Keeffe²

2005

Bull. Fr. Pêche Piscic.

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White-clawed crayfish (Austropotamobius pallipes) are widespread in Ireland in both running and standing water, although stream-dwelling in much of their range elsewhere. A detailed comparative study of a lake and a stream population demonstrated that diets changed with crayfish size from feeding on entomostracans to a predominance of aquatic macrophytes and terrestrial vegetation. However, carnivory remained important at all sizes: Gammarids were a significant component in larger lake crayfish and in all sizes of stream crayfish. Fish increased in importance with crayfish size. A. pallipes thus appears more carnivorous than some other European and American crayfish. The extent to which this is related to habitat is discussed. Key-words:Austropotamobius pallipes, diet, lake, stream, carnivory. COMPARAISON DES RÉGIMES ALIMENTAIRES DES POPULATIONS LACUSTRES ET DES RIVIÈRES DES ÉCREVISSES À PATTE BLANCHE AUSTROPOTAMOBIUS PALLIPES RÉSUMÉL'écrevisse à patte blanche (Austropotamobius pallipes) est largement répandue en Irlande dans les rivières comme dans les plans d'eau, bien qu'ailleurs, sur la majeure partie de leur aire de distribution, elle n'habite que les rivières. Une étude comparée et détaillée d'une population de ruisseau et d'une population lacustre a démontré que l'alimentation change selon la taille avec une prédominance des entomostracés chez les plus petits individus jusqu'à celle des macrophytes et de la végétation terrestre chez les plus gros. Néanmoins, la composante animale du régime alimentaire reste importante à toutes les tailles. Les gammaridés sont consommés en milieu lacustre par les écrevisses les plus grosses et par les écrevisses de ruisseau de toute taille. La consommation de poissons augmente avec la taille des écrevisses. Il apparaît qu'Austropotamobius pallipes est plus carnivore que plusieurs autres écrevisses d'Europe ou d'Amérique du Nord. Le degré auquel ce régime alimentaire est relié à l'habitat est discuté.

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“…Crayfish display opportunistic polytrophic feeding habits, consuming algae, macrophytes, detritus, zoobenthos, fish and other crayfish (Momot et al, 1978;Lagrue et al, 2014;Ercoli et al, 2015a). Invasive crayfish may also act as ecosystem engineers through the alteration of detrital processing rates (Creed and Reed, 2004;Bobeldyk and Lamberti, 2008;Carvalho et al, 2016) and by changing the dominant algal cover on substrates (Creed, 1994;Matsuzaki et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

Mathers

Chadd

Dunbar

et al. 2016

Science of The Total Environment

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The Dynamics of Crayfish and Their Role in Ecosystems

Cited by 255 publications

References 0 publications

The Relationship Between Female Size and Egg Size in the Freshwater Crayfish Austropotamobius Torrentium

The Relationship Between Female Size and Egg Size in the Freshwater Crayfish Austropotamobius Torrentium

Dietary Patterns in Stream- And Lake-Dwelling Populations of Austropotamobius Pallipes

The long-term effects of invasive signal crayfish (Pacifastacus leniusculus) on instream macroinvertebrate communities

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