|
Post by Montezuma on May 13, 2022 20:57:57 GMT -5
Some sad and disturbing pictures on male polar bears eating female polar bears. A female polar bear killed by male bear.
A female bear bear killed and being consumed by male polar bear.
|
|
|
Post by Gorilla king on Jul 21, 2022 5:11:03 GMT -5
It’s a Bear-Eat-Bear World: Understanding Cannibalism in the Largest Land Carnivores
A new review seeks to understand why the animals sometimes devour members of their own species.
www.the-scientist.com/news-opinion/it-s-a-bear-eat-bear-world-understanding-cannibalism-in-the-largest-land-carnivores-70252
Above news based on this new study:
Cannibalism in bears
Abstract
Bears are the largest terrestrial carnivores, and most bear species can be characterized as opportunistic omnivores. An infrequent foraging tactic for bears is cannibalism, where a bear consumes a conspecific individual, either through scavenging or following intraspecific predation. Although several reports of cannibalism events are known, no attempt has been made so far to gather the available information to analyze for general patterns. We therefore performed a systematic literature review to understand patterns of cannibalism in bears. We documented 39 studies detailing 198 cannibalism events. We only found evidence of cannibalism in 4 of the 8 bear species, with more events reported for polar bears (Ursus maritimus; n = 107, 54.0%) than for all other species combined. Cannibalism was most frequently associated with infanticide (n = 66, 33.3%) and conspecific strife (n = 30, 15.2%), both of which were more frequent among males than females. The most common apparent reason for cannibalism among predators is to increase fitness (i.e., eating a conspecific increases nutrition, whereas killing reduces competition for resources), but is also often linked to sexually selected infanticide in bears. Cannibalism most often appears to be an opportunistic consumption of an available carcass and not directly connected with the primary cause of death. As such, cannibalism in bears may be more casual and opportunistic than a behavior that evolved as a life history strategy.
bioone.org/journals/ursus/volume-2022/issue-33e10/URSUS-D-20-00031.2/Cannibalism-in-bears/10.2192/URSUS-D-20-00031.2.short
|
|
|
Post by Gorilla king on Nov 17, 2022 10:39:30 GMT -5
|
|
|
Post by oldindigosilverback on Nov 19, 2022 6:57:09 GMT -5
Cannibalism sadly happens among polar bears more than other bears. Therefore, it shows that saying polar bears are not true carnivores is incorrect.
Asiatic black bear cannibalism is extremely rare.
|
|
|
Post by oldindigosilverback on Nov 29, 2022 0:40:01 GMT -5
|
|
|
Post by Gorilla king on Jan 14, 2023 16:38:06 GMT -5
ALASKA PENINSULA-LARGER GRIZZLY BEAR KILLS SMALLER GRIZZLY BEAR:
|
|
|
Post by oldindigosilverback on Jan 14, 2023 16:58:12 GMT -5
/\ The violent lives among bears. Poor grizzly probably faced a slow and painful death.
|
|
|
Post by Gorilla king on Feb 9, 2023 14:30:24 GMT -5
Infanticide or predation? Cannibalism by a brown bear in Hokkaido, Japan
Abstract
Cannibalism in brown bears (Ursus arctos) is infrequently reported worldwide. This study reports evidence of brown bear cannibalism in northern Hokkaido, Japan. In April 2017, we found a bear scat containing the body parts of a bear cub. We also found a series of tracks (width of the front track: 16 cm) of an adult male bear near the scat, which were likely associated with the excrement. The scat was found at the end of a long hibernation season and the beginning of mating season of brown bears in Hokkaido. The timing suggests that the cannibalism event was a consequence of infanticide by a male bear as part of mating strategy, namely, sexually selected infanticide.
www.researchgate.net/publication/366274101_Infanticide_or_predation_Cannibalism_by_a_brown_bear_in_Hokkaido_Japan
|
|
|
Post by Gorilla king on Feb 9, 2023 16:22:32 GMT -5
Infanticide in brown bear: A case-study in the Italian Alps - Genetic identification of perpetrator and implications in small populations
Abstract and Figures
Sexually Selected Infanticide (SSI) is thought of as a male reproductive strategy in social mammalian species, because females who lose cubs may quickly re-enter oestrus. SSI has rarely been documented in non-social mammals and, in brown bears, SSI has been studied mainly in an eco-ethological perspective. The authors examined the first genetically documented infanticide case which occurred in May 2015 in brown bears in Italy (Trentino, Central-Eastern Alps). The infanticide killed two cubs and their mother. Hair samples were collected from the corpses as well as saliva, through swabs on mother's wounds, with the aim of identifying the genotype of the perpetrator. The samples were genotyped by PCR amplification of 15 autosomal microsatellite loci, following the protocol routinely used for individual bear identifications within the Interregional Action Plan for Brown Bear Conservation in the Central-Eastern Alps (PACOBACE). Reliable genotypes were obtained from the mother, cubs and putative perpetrator. The genotypes were matched with those populating the PACOBACE database and genealogies were reconstructed. Both mother and perpetrator genotypes were already present in the database. Kinship analyses confirmed mother-cubs relationships and identified the father of the cubs. In this study, for the first time, the authors used the open-source LRmix STUDIO software, designed to analyse human forensic genetic profiles, to solve a case in wildlife. Through LRmix STUDIO, those alleles that do not belong to the Nature Conservation 25: 55-75 (2018) A peer-reviewed open-access journal Francesca Davoli et al. / Nature Conservation 25: 55-75 (2018) 56 victims were isolated and, finally, the perpetrator was identified. This study presents a method that allows, through the application of different models, the genetic identification of the conspecific perpetrator with the highest probability. The identification of the infanticidal male is relevant for the better management and conservation of wild populations with small effective population size (Ne) and low population growth rate, especially in the case of recently established populations in human-dominated landscapes. This procedure will have predictably wide applications, supplying important data in the monitoring of small and isolated populations.
www.researchgate.net/publication/323365512_Infanticide_in_brown_bear_A_case-study_in_the_Italian_Alps_-_Genetic_identification_of_perpetrator_and_implications_in_small_populations
|
|
|
Post by Gorilla king on May 19, 2023 18:36:36 GMT -5
Cannibalism by Asiatic Black Bear () in the Sikhote-Alin (Russian Far East)
Abstract
Cannibalism is widespread among bears and is most common among brown bears (Ursus arctus) and polar bears (U. maritimus). However, it is rarely recorded for the Asiatic black bears (U. thibetanus). Previously several cases of cannibalism by Asiatic black bears were described in Sikhote-Alin (Russian Far East) and Japan. Our report describes two cases in which GPS-collared (Vectronic Aerospace GPS Plus-2 Collar) male Asiatic black bears consumed the remains of another same species bears in the Sikhote-Alin in 2017. Satellite telemetry allowed us to monitor utilization of prey by bears. In the first case, the adult GPS-collared male killed and ate a female and a first-year cub in the Sikhote-Alin Nature Reserve. At the kill site, we observed signs of female fight with the male. During the feeding on carcass male dragged it several times. For 12 days (June 26 – July 8), the bear completely ate the bear cub and utilized the female by 80%. In the second case, another GPS-collared adult male Asiatic black bear was feeding on Asiatic black bear for four days (July 1– 5) near the Sikhote-Alin Reserve. The causes of death of the eaten bear were unknown. It was not possible to determine the sex and age of the eaten bear, because it was almost completely utilized. The observations presented in this report supplement the data of intraspecific interaction between the Asiatic black bears.
www.researchgate.net/publication/370005771_Cannibalism_by_Asiatic_Black_Bear_in_the_Sikhote-Alin_Russian_Far_East
|
|
|
Post by Gorilla king on Aug 12, 2023 15:29:01 GMT -5
An observation of possible cannibalism by polar bears (Ursus maritimus)
Abstract
We observed a case of cannibalism by a 23-year-old adult male polar bear in very poor physical condition on Southampton Island, N.W.T. It had apparently killed an adult female and was feeding on the carcass. Cannibalism among polar bears does occur under natural conditions. It is difficult to document how often this occurs and of what ecological significance it might be.
www.researchgate.net/publication/238002067_An_observation_of_possible_cannibalism_by_polar_bears_Ursus_maritimus
|
|
|
Post by oldindigosilverback on Aug 13, 2023 3:32:11 GMT -5
/\Even a male polar bear in poor condition can kill a female. I remember the picture of a male polar bear in poor condition still has strong looking limbs.
|
|
|
Post by Gorilla king on Mar 29, 2024 1:00:03 GMT -5
|
|
|
Post by oldindigosilverback on Mar 29, 2024 20:13:44 GMT -5
/\ Kodiak bears are not beyond cannibalism. They might not be the most aggressive but are the largest and strongest brown bear subspecies species.
|
|