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61 results for “Red Squirrel”
Data from: The effects of stress and glucocorticoids on vocalizations: a test in North American red squirrels
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Data from: Multilevel and sex-specific selection on competitive traits in North American red squirrels.
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Measuring personality traits in Eurasian red squirrels: a critical comparison of different methods
<p>Data and R code used for the analysis of Eurasian red squirrels (<em>Sciurus vulgaris</em>) personality traits derived from open field test (activity, shyness, exploration) and capture-mark-recapture data (trappability/trap-diversity).</p>
Data from: The enemy of my enemy is my friend: native pine marten recovery reverses the decline of the red squirrel by suppressing grey squirrel populations
Shared enemies may instigate or modify competitive interactions between species. The dis-equilibrium caused by non-native species introductions has revealed that the outcome of such indirect interactions can often be dramatic. However, studies of enemy mediated competition mostly consider the impact of a single enemy, despite species being embedded in complex networks of interactions. Here we demonstrate that native red and invasive grey squirrels in Britain, two terrestrial species linked by resource and disease-mediated apparent competition, are also now linked by a second enemy-mediated relationship involving a shared native predator recovering from historical persecution, the European pine marten. Through combining spatial capture recapture techniques to estimate pine marten density, and squirrel site occupancy data, we find that the impact of exposure to predation is highly asymmetrical, with non-native grey squirrel occupancy strongly negatively affected by exposure to pine martens. In contrast, exposure to pine marten predation has an indirect positive effect on red squirrel populations. Pine marten predation thus reverses the well-documented outcome of resource and apparent competition between red and grey squirrels.
Data from: The effect of landscape structure on dispersal distances of the Eurasian red squirrel
Landscape structure can affect dispersal and gene flow in a species. In urban areas, buildings, roads and small habitat patches make the landscape highly fragmented and can inhibit movement and affect dispersal behavior. Similarly, in rural forested areas, large open areas, such as fields, may act as barriers to movement. We studied how landscape structure affects natal dispersal distances of Eurasian red squirrels (Sciurus vulgaris) in an urban area and a rural area in Finland, by monitoring juvenile red squirrels with radio telemetry. We observed extremely long dispersal distances—up to 16 km—in the rural study area, but shorter distances—on average only half a kilometer—in the urban study area. The landscape structure affected the eventual dispersal paths; in the rural landscape, dispersers favored spruce dominated areas and avoided fields along their dispersal route, although they occasionally even crossed wide fields. In the urban landscape, squirrels preferred areas with deciduous or coniferous trees. The movement steps made by dispersers were longer in the more hostile landscape compared to forested areas. Despite these effects on movement path, the landscape structure only had a minor effect on straight-line dispersal distances moved from the natal nest. In other words, individuals moved longer distances and were likely to circumvent barriers in their path, but this did not affect how far they settled from their natal home. This result indicates that, although landscape structure has obvious effects on movement, it still may have only a small effect on other aspects of the population, for example, gene flow.
Data from: Predators, energetics and fitness drive neonatal reproductive failure in red squirrels
Neonatal reproductive failure should occur when energetic costs of parental investment outweigh fitness benefits. However, little is known about the drivers of neonatal reproductive failure in free ranging species experiencing continuous natural variation in predator abundance and in the energetic and fitness costs and benefits associated with parental investment. Long-term comprehensive studies are required to better understand how biotic, abiotic, and life history conditions interact to drive occurrences of reproductive failure in the wild. Using 24 years (1987-2011) of reproductive data from a northern boreal population of North American red squirrels in southwestern Yukon, we examined the effects of predator abundance, energetics (resource availability, ambient temperature and litter size), and fitness benefits (probability of overwinter juvenile survival and maternal age) on occurrences of neonatal reproductive failure (494/2670 reproductive attempts; 18.5%). Neonatal reproductive failure was driven by a combination of predator abundance, and the energetic and fitness costs and benefits of parental investment. The abundance of mustelids and maternal age were positively related to the occurrence of neonatal reproductive failure. High energy costs associated with a combination of low resource availability and cold ambient temperatures or large litters, corresponded to increased occurrences of neonatal reproductive failure. However, the strength of these relationships was influenced by variation in juvenile overwinter survival (i.e. fitness benefits). We provide evidence that predation pressure is an important driver of neonatal reproductive failure. In addition, we found a trade-off occurs between resource-dependent energetic and fitness costs and benefits of raising the current litter to independence
Data from: Stress in biological invasions: introduced invasive grey squirrels increase physiological stress in native Eurasian red squirrels
1. Invasive alien species can cause extinction of native species through processes including predation, interspecific competition for resources, or disease-mediated competition. Increases in stress hormones in vertebrates may be associated with these processes and contribute to the decline in survival or reproduction of the native species. 2. Eurasian red squirrels (Sciurus vulgaris) have gone extinct across much of the British Isles and parts of Northern Italy following the introduction of North American invasive grey squirrels (Sciurus carolinensis). We extracted glucocorticoid metabolites from faecal samples to measure whether the presence of the invasive species causes an increase in physiological stress in individuals of the native species. 3. We show that native red squirrels in seven sites where they co-occurred with invasive grey squirrels had glucocorticoid concentrations that were three times higher than those in five sites without the invasive species. Moreover, in a longitudinal study, stress hormones in native red squirrels increased after colonisation by grey squirrels. When we experimentally reduced the abundance of the invasive grey squirrels, the concentration of faecal glucocorticoid metabolites in co-occurring red squirrels decreased significantly between pre- and post-removal periods. 4. Hence, we found that the invasive species acts as a stressor which significantly increases the concentrations of glucocorticoids in the native species. 5. Given that sustained elevations in glucocorticoids could reduce body growth and reproductive rate, our results are consistent with previous studies where the co-occurrence of the invasive grey squirrel was associated with smaller size and lower reproductive output in red squirrels.
On following pages: 265. Small Sun Squirrel (Heliosciurus punctatus); 266. Ruwenzori Sun Squirrel (Heliosciurus 269. Forest Giant Squirrel (Protoxerus stangeri); 270. Slender-tailed Squirrel (Protoxerus aubinnii); 271. Western Palm (Funisciurus substriatus); 274. Red-cheeked Rope Squirrel (Funisciurus leucogenys); 275. Thomas's Rope Squirrel ruwenzoril); 267. Zanj Sun Squirrel (Heliosciurus undulatus); 268. Mutable Sun Squirrel (Heliosciurus mutabilis), Squirrel (Epixerus ebii); 272. Fire-footed Rope Squirrel (Funisciurus pyrropus); 273. Kintampo Rope Squirrel (Funisciurus anerythrus); 276. Lady Burton's Rope Squirrel (Funisciurus isabella). in Sciuridae
On following pages: 265. Small Sun Squirrel (Heliosciurus punctatus); 266. Ruwenzori Sun Squirrel (Heliosciurus 269. Forest Giant Squirrel (Protoxerus stangeri); 270. Slender-tailed Squirrel (Protoxerus aubinnii); 271. Western Palm (Funisciurus substriatus); 274. Red-cheeked Rope Squirrel (Funisciurus leucogenys); 275. Thomas's Rope Squirrel ruwenzoril); 267. Zanj Sun Squirrel (Heliosciurus undulatus); 268. Mutable Sun Squirrel (Heliosciurus mutabilis), Squirrel (Epixerus ebii); 272. Fire-footed Rope Squirrel (Funisciurus pyrropus); 273. Kintampo Rope Squirrel (Funisciurus anerythrus); 276. Lady Burton's Rope Squirrel (Funisciurus isabella).
On following pages: 280. Du Chaillu's Rope Squirrel (Funisciurus duchaillui); 281. Lunda Rope Squirrel (Funisciurus 284. Boehm''s Bush Squirrel (Paraxerus boehmi); 285. Alexander's Bush Squirrel (Paraxerus alexandri); 286. Ochre (Paraxerus flavovittis); 289. Swynnerton's Bush Squirrel (Paraxerus vexillarius); 290. Smith's Bush Squirrel (Paraxerus bayonii); 282. Green Bush Squirrel (Paraxerus poensis); 283. Cooper's Mountain Squirrel (Paraxerus cooper); Bush Squirrel (Paraxerus ochraceus); 287. Red Bush Squirrel (Paraxerus palliatus), 288. Striped Bush Squirrel cepapi); 291. Black-and-red Bush Squirrel (Paraxerus lucifer); 292. Vincent's Bush Squirrel (Paraxerus vincent). in Sciuridae
On following pages: 280. Du Chaillu's Rope Squirrel (Funisciurus duchaillui); 281. Lunda Rope Squirrel (Funisciurus 284. Boehm''s Bush Squirrel (Paraxerus boehmi); 285. Alexander's Bush Squirrel (Paraxerus alexandri); 286. Ochre (Paraxerus flavovittis); 289. Swynnerton's Bush Squirrel (Paraxerus vexillarius); 290. Smith's Bush Squirrel (Paraxerus bayonii); 282. Green Bush Squirrel (Paraxerus poensis); 283. Cooper's Mountain Squirrel (Paraxerus cooper); Bush Squirrel (Paraxerus ochraceus); 287. Red Bush Squirrel (Paraxerus palliatus), 288. Striped Bush Squirrel cepapi); 291. Black-and-red Bush Squirrel (Paraxerus lucifer); 292. Vincent's Bush Squirrel (Paraxerus vincent).
On following pages: 223. Mohave Ground Squirrel (Xerospermophilus mohavensis); 224. Perote Ground Squirrel (Xerospermophilus perotensis); 225. Ring-tailed Ground Squirrel (Notocitellus annulatus); 226. Tropical Ground Squirrel (Notocitellus adocetus); 227. European Ground Squirrel (Spermophilus citellus); 228. Russet Ground Squirrel (Spermophilus major); 229. Speckled Ground Squirrel (Spermophilus suslicus); 230. Yellow Ground Squirrel (Spermophilus fulvus); 231. Little Ground Squirrel (Spermophilus pygmaeus); 232. Caucasian Mountain Ground Squirrel (Spermophilus musicus); 233. Asia Minor Ground Squirrel (Spermophilus xanthoprymnus); 234. Tauren Ground Squirrel (Spermophilus taurensis); 235. Red-cheeked Ground Squirrel (Spermophilus erythrogenys); 236. Relict Ground Squirrel (Spermophilus relictus); 237. Tian Shan Ground Squirrel (Spermophilus nilkaensis); 238. Brandt's Ground Squirrel (Spermophilus brevicauda); 239. Pallid Ground Squirrel (Spermophilus pallidicauda); 240. Alashan Ground Squirrel (Spermophilus alashanicus); 241. Daurian Ground Squirrel (Spermophilus dauricus). in Sciuridae
On following pages: 223. Mohave Ground Squirrel (Xerospermophilus mohavensis); 224. Perote Ground Squirrel (Xerospermophilus perotensis); 225. Ring-tailed Ground Squirrel (Notocitellus annulatus); 226. Tropical Ground Squirrel (Notocitellus adocetus); 227. European Ground Squirrel (Spermophilus citellus); 228. Russet Ground Squirrel (Spermophilus major); 229. Speckled Ground Squirrel (Spermophilus suslicus); 230. Yellow Ground Squirrel (Spermophilus fulvus); 231. Little Ground Squirrel (Spermophilus pygmaeus); 232. Caucasian Mountain Ground Squirrel (Spermophilus musicus); 233. Asia Minor Ground Squirrel (Spermophilus xanthoprymnus); 234. Tauren Ground Squirrel (Spermophilus taurensis); 235. Red-cheeked Ground Squirrel (Spermophilus erythrogenys); 236. Relict Ground Squirrel (Spermophilus relictus); 237. Tian Shan Ground Squirrel (Spermophilus nilkaensis); 238. Brandt's Ground Squirrel (Spermophilus brevicauda); 239. Pallid Ground Squirrel (Spermophilus pallidicauda); 240. Alashan Ground Squirrel (Spermophilus alashanicus); 241. Daurian Ground Squirrel (Spermophilus dauricus).
On following pages: 165. Unstriped Ground Squirrel (Xerus rutilus); 166. Damara Ground Squirrel (Geosciurus princeps davidianus); 169. Forrest's Rock Squirrel (Sciurotamias forresti); 170. Siberian Chipmunk (Tamias sibiricus); 171. Least (Tamias townsendii); 174. Red-tailed Chipmunk (Tamias ruficaudus); 175. Shadow Chipmunk (Tamias senex); 176.); 167. South African Ground Squirrel (Geosciurus inauris); 168. Pere David's Rock Squirrel (Sciurotamias Chipmunk (Tamias minimus); 172. Yellow-pine Chipmunk (7Tamias amoenus); 173. Townsend's Chipmunk Uinta Chipmunk (Tamias umbrinus). in Sciuridae
On following pages: 165. Unstriped Ground Squirrel (Xerus rutilus); 166. Damara Ground Squirrel (Geosciurus princeps davidianus); 169. Forrest's Rock Squirrel (Sciurotamias forresti); 170. Siberian Chipmunk (Tamias sibiricus); 171. Least (Tamias townsendii); 174. Red-tailed Chipmunk (Tamias ruficaudus); 175. Shadow Chipmunk (Tamias senex); 176.); 167. South African Ground Squirrel (Geosciurus inauris); 168. Pere David's Rock Squirrel (Sciurotamias Chipmunk (Tamias minimus); 172. Yellow-pine Chipmunk (7Tamias amoenus); 173. Townsend's Chipmunk Uinta Chipmunk (Tamias umbrinus).
On following pages: 139. Chinese Giant Flying Squirrel (Petaurista xanthotis); 140. Red-and-white Giant Flying Squirrel Flying Squirrel (Petaurista caniceps); 143. Hodgson's Giant Flying Squirrel (Petaurista magnificus); 144. Mechuka Giant Mishmi Giant Flying Squirrel (Petaurista mishmiensis); 147. Bhutan Giant Flying Squirrel (Petaurista nobilis). (Petaurista alborufus); 141. Indian Giant Flying Squirrel (Petaurista philippensis); 142. Gray-headed Giant Flying Squirrel (Petaurista mechukaensis); 145. Mebo Giant Flying Squirrel (Petaurista siangensis); 146. in Sciuridae
On following pages: 139. Chinese Giant Flying Squirrel (Petaurista xanthotis); 140. Red-and-white Giant Flying Squirrel Flying Squirrel (Petaurista caniceps); 143. Hodgson's Giant Flying Squirrel (Petaurista magnificus); 144. Mechuka Giant Mishmi Giant Flying Squirrel (Petaurista mishmiensis); 147. Bhutan Giant Flying Squirrel (Petaurista nobilis). (Petaurista alborufus); 141. Indian Giant Flying Squirrel (Petaurista philippensis); 142. Gray-headed Giant Flying Squirrel (Petaurista mechukaensis); 145. Mebo Giant Flying Squirrel (Petaurista siangensis); 146.
On following pages: 112. Southern Flying Squirrel (Glaucomys volans); 113. Javanese Flying Squirrel (lomys horsfieldi 116. Travancore Flying Squirrel (Petinomys fuscocapillus); 117. Basilan Flying Squirrel (Petinomys crinitus); 118. Mindanao Vordermann''s Flying Squirrel (Petinomys vordermanni); 121. Hagen''s Flying Squirrel (Petinomys hageni); 122. Siberut Flying Squirrel (Hylopetes phayrei); 125. Red-cheeked Flying Squirrel (Hylopetes spadiceus); 126. Palawan Flying (Hylopetes winston); 129. Sipora Flying Squirrel (Hylopetes sipora); 130. Gray-cheeked Flying Squirrel (Hylopetes kinlochii); 133. Hose's Pygmy Flying Squirrel (Petaurillus hosel); 134. Lesser Pygmy Flying Squirrel (Petaurillus emiliae); 114. Mentawai Flying Squirrel (lomys sipora); 115. Temminck's Flying Squirrel (Petinomys setosus), Flying Squirrel (Petinomys mindanensis); 119. Whiskered Flying Squirrel (Petinomys genibarbis); 120. Flying Squirrel (Petinomys lugens); 123. Particolored Flying Squirrel (Hylopetes albonigen); 124. Indochinese Squirrel (Hylopetes nigripes); 127. Jentink's Flying Squirrel (Hylopetes platyurus); 128. Sumatran Flying Squirrel sagitta); 131. Bartels's Flying Squirrel (Hylopetes bartelsi); 132. Selangor Pygmy Flying Squirrel (Petaurillus). in Sciuridae
On following pages: 112. Southern Flying Squirrel (Glaucomys volans); 113. Javanese Flying Squirrel (lomys horsfieldi 116. Travancore Flying Squirrel (Petinomys fuscocapillus); 117. Basilan Flying Squirrel (Petinomys crinitus); 118. Mindanao Vordermann''s Flying Squirrel (Petinomys vordermanni); 121. Hagen''s Flying Squirrel (Petinomys hageni); 122. Siberut Flying Squirrel (Hylopetes phayrei); 125. Red-cheeked Flying Squirrel (Hylopetes spadiceus); 126. Palawan Flying (Hylopetes winston); 129. Sipora Flying Squirrel (Hylopetes sipora); 130. Gray-cheeked Flying Squirrel (Hylopetes kinlochii); 133. Hose's Pygmy Flying Squirrel (Petaurillus hosel); 134. Lesser Pygmy Flying Squirrel (Petaurillus emiliae); 114. Mentawai Flying Squirrel (lomys sipora); 115. Temminck's Flying Squirrel (Petinomys setosus), Flying Squirrel (Petinomys mindanensis); 119. Whiskered Flying Squirrel (Petinomys genibarbis); 120. Flying Squirrel (Petinomys lugens); 123. Particolored Flying Squirrel (Hylopetes albonigen); 124. Indochinese Squirrel (Hylopetes nigripes); 127. Jentink's Flying Squirrel (Hylopetes platyurus); 128. Sumatran Flying Squirrel sagitta); 131. Bartels's Flying Squirrel (Hylopetes bartelsi); 132. Selangor Pygmy Flying Squirrel (Petaurillus).
On following pages: 98. Northern Amazon Red Squirrel (Sciurus igniventris); 99. Southern Amazon Red Squirrel (Junin Red Squirrel (Sciurus pyrrhinus); 103. Sanborn's Squirrel (Sciurus sanborni); 104. Tufted Ground Squirrel (Rheithrosciurus (Microsciurus mimulus); 107. Santander Dwarf Squirrel (Microsciurus santanderensis); 108. Amazon Dwarf Squirrel Sciurus spadiceus); 100. Guayaquil Squirrel (Sciurus stramineus); 101. Bolivian Squirrel (Sciurus ignitus); 102. macrotis); 105. Central American Dwarf Squirrel (Microsciurus alfar); 106. Western Dwarf Squirrel (Microsciurus flaviventer); 109. Bangs's Mountain Squirrel (Syntheosciurus brochus) in Sciuridae
On following pages: 98. Northern Amazon Red Squirrel (Sciurus igniventris); 99. Southern Amazon Red Squirrel (Junin Red Squirrel (Sciurus pyrrhinus); 103. Sanborn's Squirrel (Sciurus sanborni); 104. Tufted Ground Squirrel (Rheithrosciurus (Microsciurus mimulus); 107. Santander Dwarf Squirrel (Microsciurus santanderensis); 108. Amazon Dwarf Squirrel Sciurus spadiceus); 100. Guayaquil Squirrel (Sciurus stramineus); 101. Bolivian Squirrel (Sciurus ignitus); 102. macrotis); 105. Central American Dwarf Squirrel (Microsciurus alfar); 106. Western Dwarf Squirrel (Microsciurus flaviventer); 109. Bangs's Mountain Squirrel (Syntheosciurus brochus)
On following pages: 87. Red-bellied Squirrel (Sciurus aureogasten; 88. Deppe's Squirrel (Sciurus deppei); 89. Peters's variegatoides); 92. Richmond's Squirrel (Sciurus richmond); 93. Red-tailed Squirrel (Sciurus granatensis). Squirrel (Sciurus oculatus); 90. Yucatan Squirrel (Sciurus yucatanensis), 91. Variegated Squirrel (Sciurus in Sciuridae
On following pages: 87. Red-bellied Squirrel (Sciurus aureogasten; 88. Deppe's Squirrel (Sciurus deppei); 89. Peters's variegatoides); 92. Richmond's Squirrel (Sciurus richmond); 93. Red-tailed Squirrel (Sciurus granatensis). Squirrel (Sciurus oculatus); 90. Yucatan Squirrel (Sciurus yucatanensis), 91. Variegated Squirrel (Sciurus
On following pages: 75. Fremont's Squirrel (Tamiasciurus fremonti); 76. Eurasian Red Squirrel (Sciurus vulgaris); 77 carolinensis); 80. Eastern Fox Squirrel (Sciurus nigen; 81. Western Gray Squirrel (Sciurus griseus); 82. Abert's Squirrel. Japanese Squirrel (Sciurus lis); 78. Caucasian Squirrel (Sciurus anomalus); 79. Eastern Gray Squirrel (Sciurus (Sciurus aberti); 83. Arizona Gray Squirrel (Sciurus arizonensis). in Sciuridae
On following pages: 75. Fremont's Squirrel (Tamiasciurus fremonti); 76. Eurasian Red Squirrel (Sciurus vulgaris); 77 carolinensis); 80. Eastern Fox Squirrel (Sciurus nigen; 81. Western Gray Squirrel (Sciurus griseus); 82. Abert's Squirrel. Japanese Squirrel (Sciurus lis); 78. Caucasian Squirrel (Sciurus anomalus); 79. Eastern Gray Squirrel (Sciurus (Sciurus aberti); 83. Arizona Gray Squirrel (Sciurus arizonensis).
On following pages: 27. Cambodian Striped Squirrel (Tamiops rodolphii); 28. Perny's Long-nosed Squirrel (remomys pyrrhomerus); 31. Asian Red-cheeked Squirrel (Dremomys rufigenis); 32. Red-throated Squirrel (Dremomys gularis Philippine Tree Squirrel (Sundasciurus philippinensis); 36. Samar Squirrel (Sundasciurus samarensis); 37. Culion Tree Palawan Montane Squirrel (Sundasciurus rabori); 40. Southern Palawan Tree Squirrel (Sundasciurus steerii); 41. Horse-tailed pernyi); 29. Orange-bellied Himalayan Squirrel (Dremomys lokriah); 30. Red-hipped Squirrel (Dremomys); 33. Black-eared Squirrel (Nannosciurus melanotis); 34. Busuanga Squirrel (Sundasciurus hoogstraali); 35. Squirrel (Sundasciurus moellendorffi); 38. Northern Palawan Tree Squirrel (Sundasciurus juvencus); 39. Squirrel (Sundasciurus hippurus). in Sciuridae
On following pages: 27. Cambodian Striped Squirrel (Tamiops rodolphii); 28. Perny's Long-nosed Squirrel (remomys pyrrhomerus); 31. Asian Red-cheeked Squirrel (Dremomys rufigenis); 32. Red-throated Squirrel (Dremomys gularis Philippine Tree Squirrel (Sundasciurus philippinensis); 36. Samar Squirrel (Sundasciurus samarensis); 37. Culion Tree Palawan Montane Squirrel (Sundasciurus rabori); 40. Southern Palawan Tree Squirrel (Sundasciurus steerii); 41. Horse-tailed pernyi); 29. Orange-bellied Himalayan Squirrel (Dremomys lokriah); 30. Red-hipped Squirrel (Dremomys); 33. Black-eared Squirrel (Nannosciurus melanotis); 34. Busuanga Squirrel (Sundasciurus hoogstraali); 35. Squirrel (Sundasciurus moellendorffi); 38. Northern Palawan Tree Squirrel (Sundasciurus juvencus); 39. Squirrel (Sundasciurus hippurus).
Social effects on annual fitness in red squirrels
<p>When resources are limited, mean fitness is constrained and competition can cause genes and phenotypes to enhance an individual's own fitness while reducing the fitness of their competitors. Negative social effects on fitness have the potential to constrain adaptation, but the interplay between ecological opportunity and social constraints on adaptation remains poorly studied in nature. Here, we tested for evidence of phenotypic social effects on annual fitness (survival and reproductive success) in a long-term study of wild North American red squirrels (Tamiasciurus hudsonicus) under conditions of both resource limitation and super-abundant food resources. When resources were limited, populations remained stable or declined, and there were strong negative social effects on annual survival and reproductive success. That is, mean fitness was constrained and individuals had lower fitness when other nearby individuals had higher fitness. In contrast, when food resources were super-abundant, populations grew and social constraints on reproductive success were greatly reduced or eliminated. Unlike reproductive success, social constraints on survival were not significantly reduced when food resources were super-abundant. These findings suggest resource-dependent social constraints on a component of fitness, which have important potential implications for evolution and adaptation.</p>
Social effects on annual fitness in red squirrels
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Data from: Melanocortin 1 receptor (MC1R) gene sequence variation and melanism in the gray (Sciurus carolinensis), fox (Sciurus niger) and red (Sciurus vulgaris) squirrel
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