Active thrusting, landscape evolution, and late Pleistocene sector collapse of Baru Volcano above the Cocos-Nazca slab tear, southern Central America

2013 ◽  
Vol 125 (7-8) ◽  
pp. 1301-1318 ◽  
Author(s):  
K. D. Morell ◽  
T. W. Gardner ◽  
D. M. Fisher ◽  
B. D. Idleman ◽  
H. M. Zellner
Keyword(s):  
Central America ◽  
Late Pleistocene ◽  
Landscape Evolution ◽  
Sector Collapse ◽  
Slab Tear ◽  
Southern Central

scholarly journals First record of Clay-colored Sparrow (Spizella pallida Swainson, 1832) (Aves: Emberizidae) in Costa Rica

Check List ◽  
2013 ◽  
Vol 9 (6) ◽  
pp. 1592
Author(s):  
Steven Aguilar ◽  
Julio E. Sánchez ◽  
Daniel Martínez
Keyword(s):  
Costa Rica ◽  
Central America ◽  
First Record ◽  
Adult Bird ◽  
Southern Central ◽  
Wintering Range

We present the first record of the Clay-colored Sparrow (Spizella pallida) in Costa Rica. An adult bird was recorded ca. 900 Km south of its common wintering range. This represents the first record of the species for the country and for southern Central America.

scholarly journals Combined use of relative and absolute dating techniques for detecting signals of Alpine landscape evolution during the late Pleistocene and early Holocene

Geomorphology ◽  
2009 ◽  
Vol 112 (1-2) ◽  
pp. 48-66 ◽  
Author(s):  
Filippo Favilli ◽  
Markus Egli ◽  
Dagmar Brandova ◽  
Susan Ivy-Ochs ◽  
Peter Kubik ◽  
...  
Keyword(s):  
Late Pleistocene ◽  
Landscape Evolution ◽  
Early Holocene ◽  
Combined Use ◽  
Absolute Dating ◽  
Alpine Landscape

The invasive speciesCylindrodesmus hirsutusPocock (Diplopoda: Polydesmida: Haplodesmidae) spreads to the northern Caribbean, with a compilation of published localities

2018 ◽  
Vol 38 (4) ◽  
pp. 299-302
Author(s):  
Ernesto Recuero
Keyword(s):  
Central America ◽  
First Record ◽  
Quintana Roo ◽  
Commercial Activity ◽  
Tropical Regions ◽  
New Mexican ◽  
Cozumel Island ◽  
Southern Central ◽  
The Caribbean ◽  
Mexican Species

AbstractMillipede diversity in tropical regions, and in Mexico in particular, is still mostly unknown. A modest but recurrent source of new Mexican species is the colonization of exotic species, due to human activity. The invasive speciesCylindrodesmus hirsutusPocock, 1889 has spread from its area of origin in Indonesia or Melanesia and become a virtually pantropical species. Although long known from South and Central America, reports from the Caribbean are sparse and limited to some eastern islands and southern Central America. On 9 March 2016, two adult specimens were found on Cozumel Island, Quintana Roo, in an area of medium semideciduous tropical forest. This paper comprises the first record of this species from Mexico and the northern Caribbean. Given the intense commercial activity in the region, the presence of more populations both in Cozumel Island and in the mainland coast is highly probable.

Acacia glauca (wild dividivi).

2021 ◽  
Author(s):  
Nick Pasiecznik
Keyword(s):  
Central America ◽  
Leucaena Leucocephala ◽  
West Indian ◽  
The Philippines ◽  
Tropical America ◽  
Southern Central ◽  
Shrubby Species

Abstract A shrubby species (to 5 m tall) from tropical America, where it is common in parts of southern Central America and on many West Indian Islands, in particular on Curacao and Barbados. Since its introduction in the 1920s, it has become naturalized in the Philippines and Indonesia. Its habit is similar to shrubby forms of Leucaena leucocephala (the two species are sometimes confused, but the twigs of A. glauca are more reddish and its pods shorter and more rounded).

Inland dune field and deposits at Dviete: evidences of the late Pleistocene aeolian morphogenesis and landscape evolution during transition from glacial to post-glacial conditions in South-eastern Latvia

2020 ◽  
Author(s):  
Juris Soms ◽  
Zane Egle
Keyword(s):  
Late Pleistocene ◽  
Landscape Evolution ◽  
Last Deglaciation ◽  
Dune Field ◽  
Fine Grained ◽  
Aeolian Deposits ◽  
Aeolian Sediments ◽  
Aeolian Activity ◽  
Initial Evolution ◽  
Dammed Lake

<p>In the south-western part of Jersika Plain (SE Latvia), the late Pleistocene aeolian sediments form the inland dune field located at Dviete village. This dune field with surface >112 km<sup>2</sup> represents the evidence of aeolian activity and landscape evolution during the transition from glacial to post-glacial conditions in this region. The dunes have developed on the surface of glaciolacustrine plain, where subaqueous sedimentation in the Nīcgale ice-dammed lake took place during the retreat of glacier, the Pomeranian phase of the last glaciation.</p><p>Here, we focus on reconstructing paleoenvironmental conditions in this region, as inferred from landforms morphology, aeolian sand granulometry and geochemistry, and efficient wind directions derived from DEM. It will contribute to better understanding the processes of landscape evolution conditioned by last deglaciation in SE Latvia.</p><p>Results indicate that single parabolic dunes typically have U-shaped configuration in planar view. Aeolian landforms also link and override each other, presenting clustered groups. GIS analysis reveals that the dominating wind directions during the development of dunes would have been westerly to easterly. Previously published dates on OSL chronology for this dune field indicate the initial phase of aeolian activity at around 15.5 Ka and 14.5 Ka. Hence, when the studied landforms formed in presumably paraglacial landscape, the Scandinavian Ice Sheet (SIS) was still present, and most likely atmospheric circulation in this region was affected by anticyclone over the SIS.</p><p>The mean grain size <em>M<sub>z</sub></em> of the aeolian deposits forming inland dune field ranges between 143 μm and 256 μm. Hence aeolian landforms are composed mainly of fine-grained sands. It indicates the dominance of saltation and a balance between sand particles and comparatively low energy of local wind power during the aeolian processes. The sediments demonstrate well and moderately well sorting with σ values between 0.473 and 0.707 phi. Granulometry elucidates symmetrical distribution of particles of different fraction with small both negative and positive skewness <em>Sk</em> values ranging from -0.048 to 0.112 phi. For the values of kurtosis <em>K<sub>G</sub></em>, results showed that sand is mainly mesokurtic.</p><p>Geochemical analysis points out that elemental composition is rather typical for aeolian sediments, determined by the dominance of quartz and K-silicates. Among REE elements, only Y un Nb were identified in detectable concentrations. Similar geochemical signatures across the dune field suggest the provenance of sediments from one main source, possibly associated with glaciofluvial sediment transportation by extra-glacial waters draining from the already ice-free parts of adjoining uplands to the glacial lake.</p><p>As apparent from the limited number of paleosoils, aeolian deposition seems to nearly instantly follow the drainage of the Nīcgale ice-dammed lake. It is most likely that cold and dry climate in conjunction with low groundwater tables during the late Pleistocene – beginning of Holocene were among the main controlling factors which prevented development of vegetation cover in this region and delayed stabilisation of the dunes. In turn, it facilitates the action of wind over glaciolacustrine plain as the main driving process of aeolian morphogenesis during the initial evolution of metastable post-glacial landscape.</p>

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