786 research outputs found
Alien Registration- Russell, Stafford W. (Topsham, Sagadahoc County)
https://digitalmaine.com/alien_docs/9589/thumbnail.jp
MR399: Forestry-Related Nonpoint Source Pollution in Maine: A Literature Review
A great deal of research effort has been devoted to the topic of erosion and sedimentation from forest lands. This report reviews the literature dealing with the potential sources of forestry-related nonpoint source pollution and impacts on surface water, with particular emphasis on those studies conducted in Maine and in the Northeast. This review is organized along the following topics: sediment, temperature, nitrate, phosphorus, acidity, and herbicides.https://digitalcommons.library.umaine.edu/aes_miscreports/1024/thumbnail.jp
Does Seed-Caching Experience Affect Spatial Memory Performance by Pinyon Jays?
Food-storing birds use spatial memory to find previously cached food items. Throughout winter, pinyon jays (Gymnorhinus cyanocephalus) rely heavily on cached pinyon pine (Pinus edulis) seeds. Because of a recent severe drought, pinyon pine trees had not produced a significant seed crop for several years. Therefore, 1- and 2-year-old birds never had the opportunity to cache and recover seeds and birds 4 or more years of age had not recovered seeds in 3 years. This study examined whether natural but extreme variability in experience might result in differences in abstract spatial memory ability during a non-cache recovery test of spatial memory. Three groups of jays were tested for spatial memory ability in an open room analog of the radial arm maze. Two of the groups were 8 months old: young/minimally experienced birds which had 2 months of experience in the wild, while young/experienced birds had 5 months of experience in their natural habitat. The third group, adult, consisted of birds more than 3 yr old, with at least 3 yr of experience in their natural habitat. This was the only group with experience caching pine seeds. All three groups performed equally and well above chance. This suggests that spatial memory is fully developed by 8 months of age and is not affected by extensive experience in the wild
Π€ΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ²ΠΎΡΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΡΠ΅Π²ΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π΄ΠΎΡΠΊΠΎΠ»ΡΠ½ΠΈΠΊΠΎΠ² Ρ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΠΌΠΈ Π½Π°ΡΡΡΠ΅Π½ΠΈΡΠΌΠΈ Π·ΡΠ΅Π½ΠΈΡ
Π Π°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡΡΡ ΠΎΡΠ½ΠΎΠ²Π½ΡΠ΅ ΡΡΠ°ΠΏΡ ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π°Π²ΡΠΊΠΎΠ² ΡΠ²ΠΎΡΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΡΠ°ΡΡΠΊΠ°Π·ΡΠ²Π°Π½ΠΈΡ Ρ Π΄ΠΎΡΠΊΠΎΠ»ΡΠ½ΠΈΠΊΠΎΠ² Ρ ΡΡΠ½ΠΊΡΠΈΠΎΠ½Π°Π»ΡΠ½ΡΠΌΠΈ Π½Π°ΡΡΡΠ΅Π½ΠΈΡΠΌΠΈ Π·ΡΠ΅Π½ΠΈΡ, ΠΏΠ΅ΡΠ΅ΡΠΈΡΠ»ΡΡΡΡΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΡΠ΅ ΠΏΡΠΈΠ΅ΠΌΡ ΡΡΠΈΠΌΡΠ»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ²ΠΎΡΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅ΡΠ΅Π²ΠΎΠΉ Π°ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ Π΄ΠΎΡΠΊΠΎΠ»ΡΠ½ΠΈΠΊΠΎΠ² Ρ ΠΎΡΠ»Π°Π±Π»Π΅Π½Π½ΡΠΌ Π·ΡΠ΅Π½ΠΈΠ΅
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