Contribution À La Connaissance Des Mammifères Terrestres De L’île Indefatigable (= Santa Cruz), Galapagos

Niethammer, Jochen

doi:10.1515/mamm.1964.28.4.593

Cited by 10 publications

(17 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In summary, up until the mid-1990s, four of the seven known species of endemic rodents have been considered extinct. Almost all publications on Galapagos rodents since 1963 report that O. galapagoensis on San Cristobal, N. indefessus on both Santa Cruz and Baltra, N. darwini on Santa Cruz and N. swarthi on Santiago are extinct (Brosset, 1963;Niethammer, 1964;Orr, 1966;Patton & Hafner, 1983;Clark, 1984;Steadman & Zousmer, 1988;Steadman et ah, 1991;Key & Mufioz Heredia, 1994). Oryzomys galapagoensis has not been collected on San Cristobal since 1835.…”

Section: Conservation Status Of Rodents To 1995mentioning

confidence: 99%

“…Either through the introduction of pathogens to which native species were susceptible or through direct competition, black rats certainly have played a role in the rapid decline and presumed extinction of Nesoryzomys on Santa Cruz (Brosset, 1963;Niethammer, 1964;Clark, 1984;Key & Munoz Heredia, 1994). This presumption is based on historical observations of the first black rats on Santa Cruz, which was followed by rapid expansion of the introduced species and concomitant decline of the native rodents (Clark, 1984).…”

Section: Nesoryzomysmentioning

confidence: 99%

“…The history of the decline and likely extinction of the other species within the genus Nesoryzomys on Santa Cruz, with the increase and spread of introduced rodents, has been well documented (Brosset, 1963;Niethammer, 1964;Patton et al, 1975;Clark, 1984;Key and Munoz Heredia, 1994). To date, however, no conservation efforts have been directed at the native terrestrial rodents of the Galapagos Islands.…”

Section: Recommendations For Conservation Of the Endemic Rodentsmentioning

confidence: 99%

See 2 more Smart Citations

Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands

Dowler¹,

Carroll

Edwards

2000

ORX

View full text Add to dashboard Cite

The history of the endemic rodents of the Galapagos Islands began with the discovery of the first Galapagos rice rat species by Charles Darwin in 1835 and the last species was described as recently as 1980. Unfortunately, of the seven described species known to occur in the islands during the past 150 years, only two were known to be extant to 1995. Since then, two expeditions to the Galapagos Islands have been conducted to survey endemic rodent populations. The first confirmed the existence of a small endemic rice rat, Nesoryzomys fernandinae, on Fernandina, known previously only from owl pellet remains found in 1979. In 1997, an expedition to Santiago revealed a population of the larger rice rat N. swarthi, a species collected alive only once in 1906 and considered extinct in all recent literature on the Galapagos Islands. Survey efforts on Santa Cruz resulted only in the collection of introduced rodent species (Rattus rattus, R. norvegicus and Mus musculus). The extant species of native rodents in the Galapagos Islands now number four: N. narboroughi and N. fernandinae on Fernandina; N. swarthi on Santiago; and Oryzomys bauri on Santa Fe. Three species are found on islands where no introduced rodents or cats occur, whereas only one (N. swarthi) co-exists with R. rattus and M. musculus. Nesoryzomys darwini and N. indefessus on Santa Cruz and O. galapagoensis on San Cristobal are still considered extinct. Strategies for conservation should include monitoring islands for introduced rodents and cats, development of emergency plans in the event of introductions, and captive management.

show abstract

Section: Conservation Status Of Rodents To 1995mentioning

confidence: 99%

Section: Nesoryzomysmentioning

confidence: 99%

Section: Recommendations For Conservation Of the Endemic Rodentsmentioning

confidence: 99%

See 1 more Smart Citation

Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands

Dowler¹,

Carroll

Edwards

2000

ORX

View full text Add to dashboard Cite

show abstract

“…Today, just four endemic species remain: N. narboroughi and N. fernandinae on Fernandina, N. swarthi on Santiago and Oryzomys bauri on Santa Fe (Dowler et al 2000). Circumstantial spatiotemporal evidence suggests that the introduced black rat (Rattus rattus) played a leading role in the loss of the Galápagos Nesoryzomys and Oryzomys species (Brosset 1963;Niethammer 1964;Clark 1984). However, the rediscovery of N. swarthi in sympatry with R. rattus on Santiago Island is an exception to this rather clear pattern of alien arrival and native extinction.…”

Section: Introductionmentioning

confidence: 99%

Space invaders? A search for patterns underlying the coexistence of alien black rats and Galápagos rice rats

2006

View full text Add to dashboard Cite

The introduction and spread of the black rat Rattus rattus is believed to have caused the worst decline of any vertebrate taxon in Galápagos. However, the "extinct" Santiago rice rat Nesoryzomys swarthi has recently been rediscovered in sympatry with R. rattus providing the first exception to this general pattern of displacement. We carried out an exploratory investigation of this novel system with the aim of identifying patterns that may facilitate the apparent coexistence of the two species. We carried out an extensive survey of Santiago Island to map the current distribution of the endemic rice rat and to explore broad scale distribution-habitat associations. We then used live-trapping, radio-tracking, and spool-and-line tracking to quantify abundance-habitat correlations and to test for evidence of interspecific spatial segregation, alteration of N. swarthi activity patterns (spatial and temporal), and microhabitat partitioning. We found that N. swarthi has disappeared from part of its historical range and appears to be restricted to a 14 km stretch of the north-central coast, characterised by high density of the cactus Opuntia galapageia. In contrast, the generalist R. rattus was found at all survey sites. We found no evidence of spatial segregation, and home range size, temporal activity and density of N. swarthi did not vary with local density of R. rattus. However, pre-dawn and post-dusk N. swarthi activity levels increased with R. rattus density perhaps reflecting an increase in foraging effort necessary to compensate for the costs of interspecific exploitation or interference competition. The distribution, microhabitat selection, and abundance-habitat relations of N. swarthi suggest that the endemic cactus O. galapageia may facilitate interspecific coexistence. Further research should include a comparison of inter-seasonal resource preference and foraging activity of the two species coupled with replicated field experiments to confirm and quantify competition and to elucidate the mechanism of competitive coexistence.

show abstract

“…The mammal fauna of the Galapagos Archipelago has been reviewed recently by Brosset (1963), Brosset and Beaufort (1963), and Niethammer (1964), the last based on mammal remains recovered from owl pellets collected on Indefatigable or Santa Cruz. Island.…”

mentioning

confidence: 99%

Recent Mammal Records From the Galapagos Islands

Peterson¹

1966

Mammalia

View full text Add to dashboard Cite

Contribution À La Connaissance Des Mammifères Terrestres De L’île Indefatigable (= Santa Cruz), Galapagos

Cited by 10 publications

References 0 publications

Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands

Rediscovery of rodents (Genus Nesoryzomys) considered extinct in the Galápagos Islands

Space invaders? A search for patterns underlying the coexistence of alien black rats and Galápagos rice rats

Recent Mammal Records From the Galapagos Islands

Contact Info

Product

Resources

About