منابع مشابه
Exploring conservation discourses in the Galapagos Islands: A case study of the Galapagos giant tortoises.
Conservation discourses change rapidly both at global and local scales. To be able to capture these shifts and the relationships between humans and nature, we focused on a local and iconic conservation case: the Galapagos giant tortoises (Chelonoidis spp.). We used the Q methodology to contextualize conservation for science and decision making and to explore the multidimensionality of the conse...
متن کاملSaving the Giant Tortoises of the Galapagos from Extinction
The problem of saving the surviving subspecies of giant tortoises in the Galapagos archipelago varies greatly from one island to another and on the largest, Albemarle (or Isabela) it varies from volcano to volcano. Not only are there different subspecies, but there are also different dangers. Since the establishment of the Charles Darwin Research Station and the National Park Service, man has c...
متن کاملGiant Galapagos tortoises walk without inverted pendulum mechanical-energy exchange.
Animals must perform mechanical work during walking, but most conserve substantial mechanical energy via an inverted-pendulum-like mechanism of energy recovery in which fluctuations of kinetic energy (KE) and gravitational potential energy (GPE) are of similar magnitude and 180 degrees out of phase. The greatest energy recovery typically occurs at intermediate speeds. Tortoises are known for th...
متن کاملPlant species dispersed by Galapagos tortoises surf the wave of habitat suitability under anthropogenic climate change
Native biodiversity on the Galapagos Archipelago is severely threatened by invasive alien species. On Santa Cruz Island, the abundance of introduced plant species is low in the arid lowlands of the Galapagos National Park, but increases with elevation into unprotected humid highlands. Two common alien plant species, guava (Psidium guajava) and passion fruit (Passiflora edulis) occur at higher e...
متن کاملComparative study on the growth of juvenile Galapagos giant tortoises (Geochelone nigra) at the Charles Darwin Research
In this study, the growth rates of a group of Galapagos giant tortoises raised in their natural habitat at the Charles Darwin Research Station (CDRS; Galapagos Islands, Ecuador) and a group of captive-bred specimens (Zoo Zurich, Zurich, Switzerland) were compared for the first time. A great discrepancy in growth rates was observed after the first year. When the animals were 4 years old, the car...
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ژورنال
عنوان ژورنال: Evolution
سال: 1961
ISSN: 0014-3820
DOI: 10.1111/j.1558-5646.1961.tb03171.x