Does Intense Herbivory from Microtine Rodents Induce Production of Plant Estrogens in the Spring Food Plants of Willow Ptarmigan Lagopus l. lagopus?

Hanssen, Ingolf; Pedersen, Hans Chr.; Lundh, Torbjörn; Lundh, Torbjörn

doi:10.2307/3545448

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…Ranta et al, 1995; as well as in several species of grouse and ptarmigan (e.g. Hanssen et al, 1991;Lind-stroK m et al, 1995Lind-stroK m et al, , 1997. If the PLTP hypothesis holds, we would expect any polyphagous vertebrate grazer living in tundra areas and feeding on the periodically toxic plant species in the late autumn or winter to show peaks and crashes similar to those shown by microtines.…”

Section: In Crash Years?mentioning

confidence: 99%

Lethal Toxins in Non-preferred Foods: How Plant Chemical Defences Can Drive Microtine Cycles

Jensen

Doncaster

1999

Journal of Theoretical Biology

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Section: In Crash Years?mentioning

confidence: 99%

Lethal Toxins in Non-preferred Foods: How Plant Chemical Defences Can Drive Microtine Cycles

Jensen

Doncaster

1999

Journal of Theoretical Biology

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“…Both voles and grouse are known to be negatively influenced by high levels of chemical defence compounds in their food plants (see Seldal, Andersen & Högstedt 1994, Guglielmo, Karasov & Jakubas 1996, Hewitt & Kirkpatrick 1997). Currently, our knowledge of chemical defence in plants is, however, limited, and in several studies no relationship between the secondary plant compounds selected for analysis and vole or grouse numbers have been found (Jonasson, Bryant, Chapin & Andersson 1986, Lindroth & Batzli 1986, Laine & Henttonen 1987, Oksanen, Oksanen, Lukkari & Sirén 1987, Sinclair, Krebs, Smith & Boutin 1988, Hanssen, Pedersen & Lundh 1991). As long as we do not know whether mast seeding influence the digestibility or nutrient value of the plants, the causal relationship between bilberry masting and vole or grouse numbers remains unknown.…”

mentioning

confidence: 99%

Population dynamics of capercaillieTetrao urogallusin relation to bilberryVaccinium myrtillusproduction in southern Norway

Selås¹

2000

Wildlife Biology

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S e lls , V. 20 0 0: P o p u la tio n d y n a m ic s o f c a p e rc a illie Tetrao urogallus in re la tio n to b ilb e rry Vaccinium myrtillus p ro d u c tio n in so u th e rn N orw ay . -W ildl. B iol. 6: 1-11. F o re ste r T. G ra s a a s ' d a ta on n u m b e rs o f c a p e rc a illie Tetrao urogallus cock s a n d h en s o b se rv e d at le k s a n d c lu tc h siz es in Veg&rshei, s o u th e rn N orw ay , du rin g 1 9 5 3-1 962 (h ig h p o p u la tio n le v e l) a n d 19 69 -1 97 8 (lo w p o p u la tio n le ve l) w e re a n a ly se d w ith re g a rd to b ilb e rry Vaccinium myrtillus p ro d u c tio n , a u tu m n po p u la tio n ind ices and sn ow c on ditio ns in spring. F rom th e m a st d e pres sio n hy po th esis, it w as pred ic te d th a t th e n u m b e r o f capercaillie s co un te d at lek s a n d the m e a n c lu tc h siz e sh o u ld b e h ig h a fte r h ig h se e d cro ps (m a sts) o f b ilb erry , u su a lly p ro d u c e d a t in te rv a ls o f 3-5 y ears. In ste p w ise re g re ssio n m o d els, b o th th e b ilb e rry in d e x o f th e p re c e d in g y e a r an d th e au tu m n p o p u lation index one (hens) or tw o (cocks) years e arlier co ntribu ted to exp lain the m e a n n u m b e r o f c a p e rc a illie s c o u n te d at le ks d u rin g 197 0-1 978 . C a p e rc a il lie c lu tc h siz es w e re h ig h e s t in y e a rs w ith e a rly thaw , b u t th e e ffe c t w as sig n ific a n t only fo r th e p e rio d 196 9 -1 97 8. F o r th is p e rio d , th ere a lso w as a p o s itiv e e ffe c t o f th e b ilb e rry in d e x a n d a n e g a tiv e effe c t o f th e au tu m n p o p u la tio n ind ex o f th e p re v io u s year. It is c o n c lu d e d th a t th e s y n c h ro n o u s p o p u la tio n flu c tu a tio n o f g ro u se a n d v o le s in N o rw a y a n d S w e d e n ca n n o t be e x plained by the alternative prey hypo thesis alone, and th at fo o d quality should a lso be c o n sid e re d as a p o s sib le c o n trib u tin g fa c to r w h e n a n a ly sin g p o p u la tio n flu c tu a tio n s o f g ro u se a n d o th e r h e rb iv o ro u s spec ies.

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Does Intense Herbivory from Microtine Rodents Induce Production of Plant Estrogens in the Spring Food Plants of Willow Ptarmigan Lagopus l. lagopus?

Cited by 2 publications

References 19 publications

Lethal Toxins in Non-preferred Foods: How Plant Chemical Defences Can Drive Microtine Cycles

Lethal Toxins in Non-preferred Foods: How Plant Chemical Defences Can Drive Microtine Cycles

Population dynamics of capercaillieTetrao urogallusin relation to bilberryVaccinium myrtillusproduction in southern Norway

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