Hoffmann's two-toed sloth (Choloepus hoffmanni) become extinct before 2100 due to climate change

NEWS - Sloths may not survive the significant temperature increases predicted to occur by 2100. The notoriously slow-moving creatures native to Central and South America may face an existential threat from climate change, researchers say.

Research examining the metabolic response of sloths to rising temperatures suggests that the animals’ energy constraints could make survival untenable by the end of the century, particularly for high-altitude populations.

Rebecca Cliffe of the Sloth Conservation Foundation in Derbyshire, United Kingdom, and colleagues investigated how Hoffmann’s two-toed sloths (Choloepus hoffmanni), which live in highland and lowland areas, respond to varying ambient temperatures.

Using indirect calorimetry, the researchers measured the sloths’ oxygen consumption and core body temperature under conditions that mimic projected climate change. The findings suggest a troubling future for sloths, particularly those living in high-altitude areas.

"Sloths are limited by their slow metabolism and inability to regulate body temperature effectively, unlike most mammals. We show that sloths, especially in high-altitude areas, may not be able to survive the significant temperature increases predicted to occur by 2100," Cliffe said.

Original research

Cliffe RN, Ewart HE, Scantlebury DM, Kennedy S, Avey-Arroyo J, Mindich D, Wilson RP. (2024). Sloth metabolism may make survival untenable under climate change scenarios. PeerJ 12:e18168, DOI:10.7717/peerj.18168

Dlium theDlium

Black jumping spider (Hyllus diardi)

Black jumping spider ( Hyllus diardi ) is an animal species in the Salticidae, black and white spiders, long hair, round head, elongated belly, relatively small, arboreal, perched on leaves in bushes and low trees in forests and agricultural lands. H. diardi has black and white color, shiny surface and white hair all over the body. The head is round, shiny black with a linear white line in the middle. Black eyes on the front of the head. The stomach has an elongated, jointed, black cylindrical shape with black plots at the top of each segment. The legs are long, segmented, shiny black or brownish in color and hairy. Black jumping spiders live arboreal, perch on leaf surfaces, low bushes, trees in forests, agricultural land, roadsides and shade. Very sensitive to human presence and will hide behind leaves to avoid sight. Kingdom: Animalia Phylum: Arthropoda Subphylum: Chelicerata Class: Arachnida Order: Araneae Suborder: Araneomorphae Infraorder: Entelegynae Superfamily: Salticoi...

Awar awar (Ficus septica)

Awar-awar or lagnob or hauli tree or barabar or sirih popar or tobo tobo ( Ficus septica ) is species of plants in Moraceae, trees grow in bushes or in neglected places and sap contained in roots, twigs, leaves and fruit is used to treat poisoning and digestive problems. F. septica is usually 1-5 m high, although in the forest it can be up to 25 m. Round, hollow and bare branches. Roots, twigs, leaves and fruit will emit a yellow sap and sticky if injured. The base of the leaves is large and spiky, arranged alternately or face to face with a stem length of 2.5-5 cm. Large leaf blade, round egg, 9-30x9-16 cm, rounded base and blunt narrow tip, flat-edged, upper side dark green with 6-12 secondary bones pale white. Fruit paired, single or clustered up to 4 items, short-stemmed, at the base has 3 protective leaves, light green or gray green and 1.5 cm in diameter. F. septica is food for 22 animal species including wasps, bats, birds, monkeys and mice as well as seed dispersing vecto...

Hairy senna (Senna hirsuta)

Hairy senna ( Senna hirsuta ) is a species of plant in the Fabaceae family. It is an upright shrub, growing up to 2.5 meters tall. The leaves are compound on petioles up to 13 cm long. They usually have 2-6 pairs of leaflets, are egg-shaped, and have white hairs, up to 10 cm long and 5 cm wide. The flowers are yellow and arranged at the tips of branches and in the upper leaf axils in clusters of 2-5. The petals are 12-16 mm long, have 6 stamens, 3-8 mm long anthers, and 4 staminodes. Flowering occurs almost monthly. The pods are cylindrical, up to 15 cm long, 4-6 mm wide, and curved. TAXON Kingdom: Plantae Phylum: Tracheophyta Subphylum: Angiospermae Class: Magnoliopsida Order: Fabales Family: Fabaceae Subfamily: Caesalpinioideae Tribe: Cassieae Subtribe: Cassiinae Genus: Senna Mill. in Gard. Dict. Abr., ed. 4.: [s.p.] (1754) Species: Senna hirsuta (L.) H.S.Irwin & Barneby in Phytologia 44: 499 (1979) Variety: Senna hirsuta var. acuminata (Benth.) H.S.Irwin & Barneby, Senna ...

Dlium