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en Effects of linear infrastructures on the composition of local vertebrate scavenger guilds and bird carcass removal patterns in two Mediterranean agricultural landscapes. -
Modificado el valor del campo
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del recurso Acceso al recurso a2026-06-25
(anteriormente2026-06-23
) en Effects of linear infrastructures on the composition of local vertebrate scavenger guilds and bird carcass removal patterns in two Mediterranean agricultural landscapes.
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| 81 | "name": "0f7605b1-3047-571e-b1a8-b1ab2049a32e", | 95 | "name": "0f7605b1-3047-571e-b1a8-b1ab2049a32e", | ||
| 82 | "notes": "Vertebrate scavengers provide an essential ecosystem | 96 | "notes": "Vertebrate scavengers provide an essential ecosystem | ||
| 83 | service through the removal of carrion in natural landscapes, | 97 | service through the removal of carrion in natural landscapes, | ||
| 84 | including wildlife casualties caused by linear infrastructures LI). It | 98 | including wildlife casualties caused by linear infrastructures LI). It | ||
| 85 | is known that local scavenger guilds and their foraging behaviour are | 99 | is known that local scavenger guilds and their foraging behaviour are | ||
| 86 | greatly influenced by landscape features and carrion availability | 100 | greatly influenced by landscape features and carrion availability | ||
| 87 | (among other environmental factors). Thus, there is a growing | 101 | (among other environmental factors). Thus, there is a growing | ||
| 88 | perception that opportunistic scavengers take advantage of the | 102 | perception that opportunistic scavengers take advantage of the | ||
| 89 | presence of the LI and increase their predation rates within power | 103 | presence of the LI and increase their predation rates within power | ||
| 90 | line or road rights-of-way (compared to the surroundings), leading to | 104 | line or road rights-of-way (compared to the surroundings), leading to | ||
| 91 | increased bias in the studies aiming to quantify the impacts of these | 105 | increased bias in the studies aiming to quantify the impacts of these | ||
| 92 | infrastructures on wildlife. Few studies have, however, truly assessed | 106 | infrastructures on wildlife. Few studies have, however, truly assessed | ||
| 93 | how different types of LI shape the local scavenger community and its | 107 | how different types of LI shape the local scavenger community and its | ||
| 94 | cascading effects on carcass persistence. In this study, we used | 108 | cascading effects on carcass persistence. In this study, we used | ||
| 95 | camera traps to assess the effect of the presence of power lines and | 109 | camera traps to assess the effect of the presence of power lines and | ||
| 96 | roads on the identity of the vertebrate scavengers responsible for | 110 | roads on the identity of the vertebrate scavengers responsible for | ||
| 97 | removing bird carcasses in two Mediterranean agricultural landscapes | 111 | removing bird carcasses in two Mediterranean agricultural landscapes | ||
| 98 | (both located in central Portugal but with different management | 112 | (both located in central Portugal but with different management | ||
| 99 | regimes) and its effects on overall carcass persistence. During the | 113 | regimes) and its effects on overall carcass persistence. During the | ||
| 100 | winter seasons of 2017 and 2018, we monitored for 21 days the | 114 | winter seasons of 2017 and 2018, we monitored for 21 days the | ||
| 101 | scavenging of 250 carcasses of free-ranged quails (Coturnix coturnix) | 115 | scavenging of 250 carcasses of free-ranged quails (Coturnix coturnix) | ||
| 102 | placed along the rights-of-way of two transmission lines (\u2265150 | 116 | placed along the rights-of-way of two transmission lines (\u2265150 | ||
| 103 | kV)and a two-lane paved road (each comprising ca. 8 km in length), as | 117 | kV)and a two-lane paved road (each comprising ca. 8 km in length), as | ||
| 104 | well as on two control areas (one in each agricultural | 118 | well as on two control areas (one in each agricultural | ||
| 105 | landscape).Survival analyses were conducted to assess the effect of | 119 | landscape).Survival analyses were conducted to assess the effect of | ||
| 106 | type of agricultural landscape, treatment (Power line, Road and | 120 | type of agricultural landscape, treatment (Power line, Road and | ||
| 107 | Control) and Scavenger group (Raptors, Corvids, Carnivores and | 121 | Control) and Scavenger group (Raptors, Corvids, Carnivores and | ||
| 108 | Cats/Dogs) on time elapsed until the first scavenging event and time | 122 | Cats/Dogs) on time elapsed until the first scavenging event and time | ||
| 109 | until complete carcass removal. Our results show that avian scavengers | 123 | until complete carcass removal. Our results show that avian scavengers | ||
| 110 | tend to find the carcasses before mammals (~1.2 days and~2.6 days, | 124 | tend to find the carcasses before mammals (~1.2 days and~2.6 days, | ||
| 111 | respectively). Nonetheless, most of the scavenging in both | 125 | respectively). Nonetheless, most of the scavenging in both | ||
| 112 | agricultural landscapes was carried out by carnivores, with Red foxes | 126 | agricultural landscapes was carried out by carnivores, with Red foxes | ||
| 113 | (Vulpes vulpes) being responsible for more than45% of the scavenging | 127 | (Vulpes vulpes) being responsible for more than45% of the scavenging | ||
| 114 | events. The effect of LI presence on scavengers\u2019 identity and | 128 | events. The effect of LI presence on scavengers\u2019 identity and | ||
| 115 | carcass removal rates was not consistent across agricultural | 129 | carcass removal rates was not consistent across agricultural | ||
| 116 | landscapes, suggesting that broad generalizations about LI effect on | 130 | landscapes, suggesting that broad generalizations about LI effect on | ||
| 117 | scavenging patterns may not be appropriate. Contradicting common | 131 | scavenging patterns may not be appropriate. Contradicting common | ||
| 118 | assumptions, LI presence had either no effect or a positive effect on | 132 | assumptions, LI presence had either no effect or a positive effect on | ||
| 119 | carcass persistence. Carcasses placed next to roads were not removed | 133 | carcass persistence. Carcasses placed next to roads were not removed | ||
| 120 | faster than the ones placed below power lines or at control sites. | 134 | faster than the ones placed below power lines or at control sites. | ||
| 121 | This result suggests that bias in small- to medium-sized bird | 135 | This result suggests that bias in small- to medium-sized bird | ||
| 122 | mortality estimates resulting from scavengers\u2019 activity at roads | 136 | mortality estimates resulting from scavengers\u2019 activity at roads | ||
| 123 | may be negligible, particularly when compared with carcass removal | 137 | may be negligible, particularly when compared with carcass removal | ||
| 124 | resulting from traffic.", | 138 | resulting from traffic.", | ||
| 125 | "notes_translated": { | 139 | "notes_translated": { | ||
| 126 | "en": "Vertebrate scavengers provide an essential ecosystem | 140 | "en": "Vertebrate scavengers provide an essential ecosystem | ||
| 127 | service through the removal of carrion in natural landscapes, | 141 | service through the removal of carrion in natural landscapes, | ||
| 128 | including wildlife casualties caused by linear infrastructures LI). It | 142 | including wildlife casualties caused by linear infrastructures LI). It | ||
| 129 | is known that local scavenger guilds and their foraging behaviour are | 143 | is known that local scavenger guilds and their foraging behaviour are | ||
| 130 | greatly influenced by landscape features and carrion availability | 144 | greatly influenced by landscape features and carrion availability | ||
| 131 | (among other environmental factors). Thus, there is a growing | 145 | (among other environmental factors). Thus, there is a growing | ||
| 132 | perception that opportunistic scavengers take advantage of the | 146 | perception that opportunistic scavengers take advantage of the | ||
| 133 | presence of the LI and increase their predation rates within power | 147 | presence of the LI and increase their predation rates within power | ||
| 134 | line or road rights-of-way (compared to the surroundings), leading to | 148 | line or road rights-of-way (compared to the surroundings), leading to | ||
| 135 | increased bias in the studies aiming to quantify the impacts of these | 149 | increased bias in the studies aiming to quantify the impacts of these | ||
| 136 | infrastructures on wildlife. Few studies have, however, truly assessed | 150 | infrastructures on wildlife. Few studies have, however, truly assessed | ||
| 137 | how different types of LI shape the local scavenger community and its | 151 | how different types of LI shape the local scavenger community and its | ||
| 138 | cascading effects on carcass persistence. In this study, we used | 152 | cascading effects on carcass persistence. In this study, we used | ||
| 139 | camera traps to assess the effect of the presence of power lines and | 153 | camera traps to assess the effect of the presence of power lines and | ||
| 140 | roads on the identity of the vertebrate scavengers responsible for | 154 | roads on the identity of the vertebrate scavengers responsible for | ||
| 141 | removing bird carcasses in two Mediterranean agricultural landscapes | 155 | removing bird carcasses in two Mediterranean agricultural landscapes | ||
| 142 | (both located in central Portugal but with different management | 156 | (both located in central Portugal but with different management | ||
| 143 | regimes) and its effects on overall carcass persistence. During the | 157 | regimes) and its effects on overall carcass persistence. During the | ||
| 144 | winter seasons of 2017 and 2018, we monitored for 21 days the | 158 | winter seasons of 2017 and 2018, we monitored for 21 days the | ||
| 145 | scavenging of 250 carcasses of free-ranged quails (Coturnix coturnix) | 159 | scavenging of 250 carcasses of free-ranged quails (Coturnix coturnix) | ||
| 146 | placed along the rights-of-way of two transmission lines (\u2265150 | 160 | placed along the rights-of-way of two transmission lines (\u2265150 | ||
| 147 | kV)and a two-lane paved road (each comprising ca. 8 km in length), as | 161 | kV)and a two-lane paved road (each comprising ca. 8 km in length), as | ||
| 148 | well as on two control areas (one in each agricultural | 162 | well as on two control areas (one in each agricultural | ||
| 149 | landscape).Survival analyses were conducted to assess the effect of | 163 | landscape).Survival analyses were conducted to assess the effect of | ||
| 150 | type of agricultural landscape, treatment (Power line, Road and | 164 | type of agricultural landscape, treatment (Power line, Road and | ||
| 151 | Control) and Scavenger group (Raptors, Corvids, Carnivores and | 165 | Control) and Scavenger group (Raptors, Corvids, Carnivores and | ||
| 152 | Cats/Dogs) on time elapsed until the first scavenging event and time | 166 | Cats/Dogs) on time elapsed until the first scavenging event and time | ||
| 153 | until complete carcass removal. Our results show that avian scavengers | 167 | until complete carcass removal. Our results show that avian scavengers | ||
| 154 | tend to find the carcasses before mammals (~1.2 days and~2.6 days, | 168 | tend to find the carcasses before mammals (~1.2 days and~2.6 days, | ||
| 155 | respectively). Nonetheless, most of the scavenging in both | 169 | respectively). Nonetheless, most of the scavenging in both | ||
| 156 | agricultural landscapes was carried out by carnivores, with Red foxes | 170 | agricultural landscapes was carried out by carnivores, with Red foxes | ||
| 157 | (Vulpes vulpes) being responsible for more than45% of the scavenging | 171 | (Vulpes vulpes) being responsible for more than45% of the scavenging | ||
| 158 | events. The effect of LI presence on scavengers\u2019 identity and | 172 | events. The effect of LI presence on scavengers\u2019 identity and | ||
| 159 | carcass removal rates was not consistent across agricultural | 173 | carcass removal rates was not consistent across agricultural | ||
| 160 | landscapes, suggesting that broad generalizations about LI effect on | 174 | landscapes, suggesting that broad generalizations about LI effect on | ||
| 161 | scavenging patterns may not be appropriate. Contradicting common | 175 | scavenging patterns may not be appropriate. Contradicting common | ||
| 162 | assumptions, LI presence had either no effect or a positive effect on | 176 | assumptions, LI presence had either no effect or a positive effect on | ||
| 163 | carcass persistence. Carcasses placed next to roads were not removed | 177 | carcass persistence. Carcasses placed next to roads were not removed | ||
| 164 | faster than the ones placed below power lines or at control sites. | 178 | faster than the ones placed below power lines or at control sites. | ||
| 165 | This result suggests that bias in small- to medium-sized bird | 179 | This result suggests that bias in small- to medium-sized bird | ||
| 166 | mortality estimates resulting from scavengers\u2019 activity at roads | 180 | mortality estimates resulting from scavengers\u2019 activity at roads | ||
| 167 | may be negligible, particularly when compared with carcass removal | 181 | may be negligible, particularly when compared with carcass removal | ||
| 168 | resulting from traffic.", | 182 | resulting from traffic.", | ||
| 169 | "es": "Vertebrate scavengers provide an essential ecosystem | 183 | "es": "Vertebrate scavengers provide an essential ecosystem | ||
| 170 | service through the removal of carrion in natural landscapes, | 184 | service through the removal of carrion in natural landscapes, | ||
| 171 | including wildlife casualties caused by linear infrastructures LI). It | 185 | including wildlife casualties caused by linear infrastructures LI). It | ||
| 172 | is known that local scavenger guilds and their foraging behaviour are | 186 | is known that local scavenger guilds and their foraging behaviour are | ||
| 173 | greatly influenced by landscape features and carrion availability | 187 | greatly influenced by landscape features and carrion availability | ||
| 174 | (among other environmental factors). Thus, there is a growing | 188 | (among other environmental factors). Thus, there is a growing | ||
| 175 | perception that opportunistic scavengers take advantage of the | 189 | perception that opportunistic scavengers take advantage of the | ||
| 176 | presence of the LI and increase their predation rates within power | 190 | presence of the LI and increase their predation rates within power | ||
| 177 | line or road rights-of-way (compared to the surroundings), leading to | 191 | line or road rights-of-way (compared to the surroundings), leading to | ||
| 178 | increased bias in the studies aiming to quantify the impacts of these | 192 | increased bias in the studies aiming to quantify the impacts of these | ||
| 179 | infrastructures on wildlife. Few studies have, however, truly assessed | 193 | infrastructures on wildlife. Few studies have, however, truly assessed | ||
| 180 | how different types of LI shape the local scavenger community and its | 194 | how different types of LI shape the local scavenger community and its | ||
| 181 | cascading effects on carcass persistence. In this study, we used | 195 | cascading effects on carcass persistence. In this study, we used | ||
| 182 | camera traps to assess the effect of the presence of power lines and | 196 | camera traps to assess the effect of the presence of power lines and | ||
| 183 | roads on the identity of the vertebrate scavengers responsible for | 197 | roads on the identity of the vertebrate scavengers responsible for | ||
| 184 | removing bird carcasses in two Mediterranean agricultural landscapes | 198 | removing bird carcasses in two Mediterranean agricultural landscapes | ||
| 185 | (both located in central Portugal but with different management | 199 | (both located in central Portugal but with different management | ||
| 186 | regimes) and its effects on overall carcass persistence. During the | 200 | regimes) and its effects on overall carcass persistence. During the | ||
| 187 | winter seasons of 2017 and 2018, we monitored for 21 days the | 201 | winter seasons of 2017 and 2018, we monitored for 21 days the | ||
| 188 | scavenging of 250 carcasses of free-ranged quails (Coturnix coturnix) | 202 | scavenging of 250 carcasses of free-ranged quails (Coturnix coturnix) | ||
| 189 | placed along the rights-of-way of two transmission lines (\u2265150 | 203 | placed along the rights-of-way of two transmission lines (\u2265150 | ||
| 190 | kV)and a two-lane paved road (each comprising ca. 8 km in length), as | 204 | kV)and a two-lane paved road (each comprising ca. 8 km in length), as | ||
| 191 | well as on two control areas (one in each agricultural | 205 | well as on two control areas (one in each agricultural | ||
| 192 | landscape).Survival analyses were conducted to assess the effect of | 206 | landscape).Survival analyses were conducted to assess the effect of | ||
| 193 | type of agricultural landscape, treatment (Power line, Road and | 207 | type of agricultural landscape, treatment (Power line, Road and | ||
| 194 | Control) and Scavenger group (Raptors, Corvids, Carnivores and | 208 | Control) and Scavenger group (Raptors, Corvids, Carnivores and | ||
| 195 | Cats/Dogs) on time elapsed until the first scavenging event and time | 209 | Cats/Dogs) on time elapsed until the first scavenging event and time | ||
| 196 | until complete carcass removal. Our results show that avian scavengers | 210 | until complete carcass removal. Our results show that avian scavengers | ||
| 197 | tend to find the carcasses before mammals (~1.2 days and~2.6 days, | 211 | tend to find the carcasses before mammals (~1.2 days and~2.6 days, | ||
| 198 | respectively). Nonetheless, most of the scavenging in both | 212 | respectively). Nonetheless, most of the scavenging in both | ||
| 199 | agricultural landscapes was carried out by carnivores, with Red foxes | 213 | agricultural landscapes was carried out by carnivores, with Red foxes | ||
| 200 | (Vulpes vulpes) being responsible for more than45% of the scavenging | 214 | (Vulpes vulpes) being responsible for more than45% of the scavenging | ||
| 201 | events. The effect of LI presence on scavengers\u2019 identity and | 215 | events. The effect of LI presence on scavengers\u2019 identity and | ||
| 202 | carcass removal rates was not consistent across agricultural | 216 | carcass removal rates was not consistent across agricultural | ||
| 203 | landscapes, suggesting that broad generalizations about LI effect on | 217 | landscapes, suggesting that broad generalizations about LI effect on | ||
| 204 | scavenging patterns may not be appropriate. Contradicting common | 218 | scavenging patterns may not be appropriate. Contradicting common | ||
| 205 | assumptions, LI presence had either no effect or a positive effect on | 219 | assumptions, LI presence had either no effect or a positive effect on | ||
| 206 | carcass persistence. Carcasses placed next to roads were not removed | 220 | carcass persistence. Carcasses placed next to roads were not removed | ||
| 207 | faster than the ones placed below power lines or at control sites. | 221 | faster than the ones placed below power lines or at control sites. | ||
| 208 | This result suggests that bias in small- to medium-sized bird | 222 | This result suggests that bias in small- to medium-sized bird | ||
| 209 | mortality estimates resulting from scavengers\u2019 activity at roads | 223 | mortality estimates resulting from scavengers\u2019 activity at roads | ||
| 210 | may be negligible, particularly when compared with carcass removal | 224 | may be negligible, particularly when compared with carcass removal | ||
| 211 | resulting from traffic." | 225 | resulting from traffic." | ||
| 212 | }, | 226 | }, | ||
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