The Vegetation of Robinson Crusoe Island (Isla Masatierra), Juan Fernandez Archipelago, Chile

2002 ◽  
Vol 56 (3) ◽  
pp. 263-284 ◽  
Author(s):  
Josef Greimler ◽  
Patricio Lopez S. ◽  
Tod F. Stuessy ◽  
Thomas Dirnbock
Keyword(s):  
Robinson Crusoe ◽  
Juan Fernández Archipelago

Anthomyiidae, Fanniidae and Muscidae (Diptera) from the Juan Fernández Archipelago (Chile): 60 years after Willi Hennig’s contributions

Zootaxa ◽  
2018 ◽  
Vol 4402 (2) ◽  
pp. 373
Author(s):  
LUCAS R. P. GOMES ◽  
MÁRCIA S. COURI ◽  
CLAUDIO J. B. DE CARVALHO
Keyword(s):  
Endemic Species ◽  
New Records ◽  
Robinson Crusoe ◽  
Volcanic Islands ◽  
Juan Fernández Archipelago ◽  
Delia Platura

Sixty years ago, Willi Hennig last catalogued the Anthomyiidae, Fanniidae and Muscidae fauna of the Juan Fernández Archipelago. This archipelago, composed of three main volcanic islands (Robinson Crusoe, Alejandro Selkirk and Santa Clara), has many endemic species. We describe Fannia hennigi sp. n. from the Robinson Crusoe Island, and record 11 species in 10 genera of Anthomyiidae, Fanniidae and Muscidae. A key to the identification of all species found in Juan Fernández Archipelago and a table with all species found in the Archipelago are presented, including four new records from Robinson Crusoe Island: Delia platura (Meigen, 1826); Fannia hennigi sp. n.; Lispoides insularis Hennig, 1957 and Schoenomyzina emdeni Hennig, 1955. 

scholarly journals Near-shore distribution of phyllosomas of the two only lobster species (Decapoda: Achelata) present in Robinson Crusoe Island and endemic to the Juan Fernández archipelago

2011 ◽  
Vol 84 (3) ◽  
pp. 379-390 ◽  
Author(s):  
ÁLVARO T PALMA ◽  
ISMAEL CÁCERES-MONTENEGRO ◽  
RICHARD S BENNETT ◽  
SPARTACO MAGNOLFI ◽  
LUIS A HENRÍQUEZ ◽  
...  
Keyword(s):  
Robinson Crusoe ◽  
Near Shore ◽  
Juan Fernández Archipelago

Predicting Future Threats to the Native Vegetation of Robinson Crusoe Island, Juan Fernandez Archipelago, Chile

2003 ◽  
Vol 17 (6) ◽  
pp. 1650-1659 ◽  
Author(s):  
THOMAS DIRNBÖCK ◽  
JOSEF GREIMLER ◽  
PATRICIO LOPEZ S. ◽  
TOD F. STUESSY
Keyword(s):  
Native Vegetation ◽  
Robinson Crusoe ◽  
Juan Fernández Archipelago

Floral nectary structure and nectar chemical composition of some species from Robinson Crusoe Island (Chile)

2000 ◽  
Vol 78 (7) ◽  
pp. 862-871 ◽  
Author(s):  
Gabriel Bernardello ◽  
Leonardo Galetto ◽  
Gregory J Anderson
Keyword(s):  
Statistical Tests ◽  
General Pattern ◽  
Wind Pollination ◽  
Robinson Crusoe ◽  
Floral Nectary ◽  
Nectary Structure ◽  
Nectar Composition ◽  
Hummingbird Pollination ◽  
Self Compatibility ◽  
Juan Fernández Archipelago

Floral nectary structure and nectar composition of 12 species, including 11 endemics, are reported from Robinson Crusoe Island (Juan Fernández Archipelago, Chile). These species are mostly hummingbird pollinated. Nectary morphology follows the general pattern within each of the families, suggesting it is an ancestral feature. The mean nectar concentration (± SD) as a percentage of weight (weight/total weight of solution) was 28.3 ± 20.7. Sucrose, fructose, and glucose were identified in most samples. In Nicotiana cordifolia, an unknown monosaccharide was also detected. When more than one sample per species was examined, there was usually variability in sugar ratios. Statistical tests indicated that population size does not influence this variability. However, there were differences when the pollinator type was compared, with a trend of a higher sucrose proportion and a lower coefficient of variation of sucrose in the species pollinated by hummingbirds. This would indicate a specialization in the nectar composition of the hummingbird-pollinated species. Cuminia eriantha, N. cordifolia, and Rhaphithamnus venustus also possess amino acids in their nectar. In the non-hummingbird-pollinated species, the presence of nectaries and nectar serves as an indication of the ancestral pollination system of the first colonizers rather than the current condition, which is wind pollination or self-compatibility for most of the species. Thus, the presence of nectar in flowers does not necessarily indicate extant biotic pollination.Key words: angiosperms, Robinson Crusoe Island, nectary structure, nectar sugar composition, sugar concentration, hummingbird pollination.

Use of acoustic and stereo camera systems for assessing demersal fish of Robinson Crusoe Island (Juan Fernández Archipelago, off central Chile)

2017 ◽  
Vol 141 (5) ◽  
pp. 3865-3865
Author(s):  
Billy Ernst ◽  
Pablo Rivara ◽  
Braulio Tapia ◽  
Stephane Gauthier ◽  
Francisco Santa Cruz ◽  
...  
Keyword(s):  
Demersal Fish ◽  
Robinson Crusoe ◽  
Central Chile ◽  
Stereo Camera ◽  
Camera Systems ◽  
Juan Fernández Archipelago

Revision and phylogenetic analysis of the spider genus Philisca Simon (Araneae: Anyphaenidae, Amaurobioidinae)

Zootaxa ◽  
2012 ◽  
Vol 3443 (1) ◽  
pp. 1 ◽  
Author(s):  
EDUARDO M. SOTO ◽  
MARTÍN J. RAMÍREZ
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
Robinson Crusoe ◽  
Juan Fernández Islands ◽  
The Family ◽  
Juan Fernández Archipelago ◽  
Juan Fernandez Islands

We review the spider genus Philisca Simon, an endemic of the southern forests in Chile and Argentina, and present aphylogenetic analysis including 15 species, of which five are newly described (P. atrata, P. robinson, P. viernes, P. pizarroiand P. robusta), together with other 98 representatives of the family Anyphaenidae. Four species names are considerednomina dubia (Clubiona gayi Nicolet, Drassus mirandus Nicolet, Clubiona altiformis Nicolet, P. obscura Simon). Cluiliuschilensis Mello-Leitão is newly synonymized with P. accentifera Simon. The phylogenetic analysis resulted in P.puconensis Ramírez branching off basally in the genus, because of its numerous leg spines and unmodified malechelicerae, all plesiomorphic for the group; the remaining species form two clear groups. The first one, formed by P. hahniSimon, P. tripunctata (Nicolet), P. amoena (Simon), P. hyadesi (Simon) and P. doilu (Ramírez), are grouped by the lossof spines on legs I and II. The second, formed by P. huapi Ramírez, P. ingens Berland, P. ornata Berland, P. accentiferaSimon, P. atrata and four new species endemic to the Robinson Crusoe Island in the Juan Fernández Archipelago, havethe male chelicerae, and in most cases also the endites, modified. In total, six species of Philisca are endemic to JuanFernández, but our dataset is not conclusive for the distinction of alternative colonization scenarios. We analyze theevolution of leg macrosetae, and show two independent instances of reduction of spination, one on the continent and another on the Juan Fernández islands.

scholarly journals High levels of connectivity over large distances in the diadematid sea urchin Centrostephanus sylviae

PLoS ONE ◽  
2021 ◽  
Vol 16 (11) ◽  
pp. e0259595
Author(s):  
David Veliz ◽  
Noemi Rojas-Hernández ◽  
Pablo Fibla ◽  
Boris Dewitte ◽  
Sebastián Cornejo-Guzmán ◽  
...  
Keyword(s):  
Genetic Structure ◽  
Sea Urchin ◽  
Marine Invertebrates ◽  
Spatial Genetic Structure ◽  
Large Population ◽  
Circulation Pattern ◽  
Nucleotide Polymorphisms ◽  
Robinson Crusoe ◽  
Isolated Populations ◽  
Juan Fernández Archipelago

Most benthic marine invertebrates with sedentary benthic adult phases have planktonic larvae that permit connectivity between geographically isolated populations. Planktonic larval duration and oceanographic processes are vital to connecting populations of species inhabiting remote and distant islands. In the present study, we analyzed the population genetic structure of the sea urchin Centrostephanus sylviae, which inhabits only the Juan Fernández Archipelago and the Desventuradas islands, separated by more than 800 km. For 92 individuals collected from Robinson Crusoe and Selkirk Islands (Juan Fernández Archipelago) and San Ambrosio Island (Desventuradas Islands), 7,067 single nucleotide polymorphisms (SNPs) were obtained. The results did not show a spatial genetic structure for C. sylviae; relative high migration rates were revealed between the islands. An analysis of the water circulation pattern in the area described a predominant northward water flow with periods of inverted flow, suggesting that larvae could move in both directions. Overall, this evidence suggests that C. sylviae comprises a single large population composed of individuals separated by more than 800 km.

Characteristics and distribution of coastal fish schools around Robinson Crusoe island (Juan Fernandez Archipelago, Chile)

2017 ◽  
Author(s):  
Braulio Tapia Alvarez ◽  
Stephane Gauthier ◽  
Billy Ernst Elizalde ◽  
Esteban Molina Guerrero ◽  
Pablo Rivara Saavedra ◽  
...  
Keyword(s):  
Robinson Crusoe ◽  
Coastal Fish ◽  
Fish Schools ◽  
Juan Fernández Archipelago

An Outline of the Geology of the Juan Fernandez Archipelago

1967 ◽  
Vol 104 (2) ◽  
pp. 110-115 ◽  
Author(s):  
P. E. Baker
Keyword(s):  
Coarse Grained ◽  
Basaltic Lava ◽  
Robinson Crusoe ◽  
Submarine Eruption ◽  
Acid Rock ◽  
The Past ◽  
Late Tertiary ◽  
South Sandwich Islands ◽  
Volcanic Islands ◽  
Juan Fernández Archipelago

AbstractThe Juan Fernandez Archipelago, located off the coast of Chile, comprises a group of three small, considerably eroded volcanic islands, probably of late Tertiary age. Traces of old craters or calderas have been recognized on Robinson Crusoe Island which is built mainly of basaltic lava flows, many of them picrite-basalts. Coarse-grained ejected blocks, in which olivine predominates, are fairly common on Robinson Crusoe and there are also a number of exposures of dolerite showing pronounced banding. The only acid rock reported from the group is a soda-trachyte from Alexander Selkirk Island. Pumice washed ashore on the islands during the past year is possibly from a submarine eruption near the South Sandwich Islands in 1962.

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