Wyniki wyszukiwania

1

Nasze (przyszłe) raki? Procambarus clarkii, Girard - potencjalnym zagrożeniem naszych wód

100%

Struzynski W., Niemiec T.

Przegląd Rybacki

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1999

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tom 24

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nr 5[48]

2

Nowości z importu

58%

Lukhaup C., Pekny R.

Nasze Akwarium. Miesięcznik Miłośników i Hodowców Ryb

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2005

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nr 06-07[68]

3

Ochrona rodzimych raków wobec zagrożeń związanych z rozprzestrzenianiem się obcych gatunków

58%

Struzynski W., Smietana P.

Przegląd Rybacki

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1998

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tom 23

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nr 6[43]

4

Light activation of phospholipase A2 in the photoreceptor of the crayfish [Procambarus clarkii]

58%

Kashiwagi T., Meyer-Rochow V. B., Nishimura K., Eguchi E.

Acta Neurobiologiae Experimentalis

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2000

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tom 60

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nr 1

Retinal lipids of crayfish, kept at 4°C under continuous darkness for 3 weeks, consisted mainly of phosphatidylcholine (PC) and phosphatidylethanolamine (PE); sphingomyelin (SM), phosphatidylinositol (PI) and phosphatidylserine (PS) were minor contributors. PI, involved in the phototransduction cascade, never reached greater concentrations than 7% of the total. High concentrations of polyunsaturated fatty acids (PUFA) such as 20:4n-6, 20:5n-3 and 22:6n-3 (DHA, docosahexaenoic acid) were present in PC, PE and PS, but scarce in SM and PL In retinae of crayfish kept at 4°C in darkness for 3 weeks and then exposed to white light (6 h; ca. 4,500 lx), SM and PS remained seemingly unaffected. PC, however, significantly decreased within 10 min to 65% of the initial value and 50% at 180 min. To study the reduction of PC, lipids of retinae suspended in physiological solution with/without phospholipase C (PLC) and phospholipase A2 (PLA2) inhibitors such as DMDA (=DEDA), manoalide, ET-I8-OCH3, and U-73122 were measured. Only free fatty acids (FFA) of retinae with inhibitors of PLA2 like DMDA and manoalide decreased. Retinae irradiated by white light for 3 h displayed a significant reduction of PC, compared with those that had remained in continuous darkness. However, the PC of retinae with PLA2-inhibitors was not decreased by light. Our results provide evidence that not only photoreceptor cell PLC, but also PLA2 is activated by light.

5

Feeding habits of three sympatric mammals in NE Spain: the American mink, the spotted genet, and the Eurasian otter

58%

Melero Y., Palazon S., Bonesi L., Gosalbez J.

Acta Theriologica

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2008

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tom 53

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nr 3

Diet composition, niche measures, and prey consumption of three sympatric species of carnivores, one non-native and introduced, the American minkNeovison vison Schreber, 1777, and two native, the spotted genetGenetta genetta Linnaeus, 1758 and the Eurasian otterLutra lutra Linnaeus, 1758, were studied in a Spanish Mediterranean area. The study was based on the analysis of prey remains in the faeces of the predators. Faeces of mink (n = 444), genet (n = 310), and otter (n = 108) were collected all year round for four years along the Llobregat (21 km) and Gavarresa rivers (12 km). Simultaneously, and in the same area, prey species density and weight were estimated by means of trapping. The diet of mink and genet was dominated by the American crayfishProcambarus clarkii, while the otter fed almost exclusively on fish. Compared to the mink, the genet seemed to specialise more on small mammals while the mink specialised more on aquatic birds, especially in autumn-winter. Niche overlap was higher between mink and genet than between either of them and the otter.

6

Does size matter? Relating consumed prey sizes and diet composition of otters in South Iberian coastal streams

51%

Clavero M., Prenda J., Delibes M.

Acta Theriologica

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2007

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tom 52

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nr 1

We analysed seasonal changes in the sizes of prey [grey mullets (Mugilidae), flatfish (Soleidae), eelAnguilla anguilla and crayfishProcambarus clarkii] consumed by ottersLutra lutra Linnaeus, 1758 in a Mediterranean-climate coastal area and relate them to the frequencies of occurrence of each prey species in otter diet. The sizes of over 1500 otter prey were estimated from measurements of key pieces found in 814 otter spraints, which were collected in lower stream stretches in a sandy coastal area. Clear relationships between mean prey size and frequency of occurrence were observed for the four prey types. These relationships were positive for grey mullets, flatfish and crayfish (ie they occurred more in otter diet when more large individuals were predated), but was negative in the case of eels. Results suggest that these patterns could be related to seasonal changes in habitat use. Previous works in the study area showed that otter concentrate its predation efforts in freshwater stream stretches during spring and summer, when more and larger crayfish are available. Freshwater stretches have neither grey mullets nor flatfish, while eels are larger and scarcer there than near streams’ mouths, where crayfish is absent.

Ograniczanie wyników

2 Acta Theriologica

2 Przegląd Rybacki

1 Acta Neurobiologiae Experimentalis

1 Nasze Akwarium. Miesięcznik Miłośników i Hodowców Ryb

2 Struzynski W.

1 Bonesi L.

1 Clavero M.

1 Delibes M.

1 Eguchi E.

1 Gosalbez J.

1 Kashiwagi T.

1 Lukhaup C.

1 Melero Y.

1 Meyer-Rochow V. B.

1 Niemiec T.

1 Nishimura K.

1 Palazon S.

1 Pekny R.

1 Prenda J.

1 Smietana P.

1 2008

1 2007

1 2005

1 2000