Re: Schneckenzaun aus Kupfer
Verfasst: Do 3. Mär 2011, 13:02
Zum einen: meine Zehennägel sind noch geradeemil17 hat geschrieben:Wenn die Schnecke gleichzeitig über zwei verschiedene Metalle kriecht, dann fliesst durch sie ein Strom ...
"Chemische Reaktion" von Kupfer mit Schnecke gibt es so nicht, ausserdem wird diese Ausdrucksweise jedem Chemiker die Zehennägel einrollen.
Zum anderen: dieser Thread behandelte ursprünglich nicht die Frage, was passiert, wenn eine Schnecke gleichzeitig über zwei verschiedene Metalle kriecht, sondern, was passiert, wenn eine Schnecke über Kupferdraht kriecht. Und das einzige, was dabei meiner bescheidenen Meinung nach passieren könnte, wäre eine chemische Reaktion zwischen dem Kupfer und den Komponenten des auf der Schneckenoberfläche befindlichen Schleims.
So, und schließlich habe ich zu dem Spaß jetzt mal Web of Science befragt und eine Veröffentlichung aus dem Jahr 1997 gefunden, die über Untersuchungen mit Kupferdrahtgitter berichtet (wenn auch keinem einzelnen Draht): Trent Y. Hata, Arnold H. Hara and Benjamin K.-S. Hu (1997): Molluscicides and mechanical barriers against slugs, Vaginula plebeia Fischer and Veronicella cubensis (Pfeiffer) (Stylommatophora: Veronicellidae), Crop Protection, 16, 501-506.
Da ich aus urheberrechtlichen Gründen nicht auf den Volltext verlinken kann, nachfolgend zwei Zitate:
Materials and Methods:
"Barriers (30 x 30 cm) created from copper, aluminum, fiberglass or corrugated paperboard were located on a 15 x 20 x 41 cm hollow tile concrete block that simulated greenhouse bench legs (Figure 1). The tile block was situated in the center of a 0.5 x 0.6 m plastic arena. Specifications for the barrier screens were: 1.4 x 1.4 x 0.6 mm mesh copper screen (Flynn and Enslow, Inc., San Francisco, CA); 1.4 x 1.4 x 0.7 mm mesh aluminum insect screen
(Phifer Wire Products, Inc., Tuscaloosa, AL); 1.4 x 1.4 x 0.3 mm mesh fiberglass insect screen (H anover Wire Cloth, Hanover, PA); and 30 cm x 30 cm x 2.0 mm corrugated paperboard. Tests were conducted in a dark ventilated room and replicated three times with 100 slugs per repetition for both species. A 2.5 cm-thick layer of moistened peat moss covered the bottom of the arena and a 2.5 cm-wide band of NaCl embedded on petroleum
jelly (Valu-Rite, San Francisco, CA) along the perimeter of the arena prevented slugs from escaping. The slug bait (Slug and Snail AG Pelleted
Bait, Hacco, Inc., Madison, WI) was contained in a 19.7 cm diameter saucer located on the barrier. The efficacy of the barrier was evaluated by the number of slugs foraging up the hollow tile block, crossing the barrier and feeding on the attractive, moistened slug bait. The number of dead slugs in the saucer was counted daily for 7 days."
Results and Discussion:
"Copper and fiberglass screen barriers substantially reduced slugs from foraging to the slug bait (Table 6). Only 3 mean percent of V cubensis and 1.7 mean percent of V plebeiu passed the copper barrier. The fiberglass screen reduced foraging apparently because the weight of the slugs collapsed the screen. There was no significant difference between the aluminum barrier and the paperboard control. Previous bioassay tests demonstrated that Slug and Snail AG Pelleted Bait (Hacco, Inc.) killed only 62 and 60% of K plebeia and K cubemis, respectively; therefore, some slugs may have crossed the barrier and returned to the peat arena. Dead slugs were recovered from the peat arena, but the exact cause of mortality is unknown. Mortality in the peat arena may have been natural, from the salt barrier or from the molluscitide, but the mean percent mortality did not exceed 13 + 2% for K cubensis and 22 f 12% for Vpfebeia."
Viel Spaß damit!
