Términos relacionados

8 resultados encontrados para: TEMA: Lago Petén Itzá (Petén, Guatemala)
  • «
  • 1 de 1
  • »
1.
Artículo
*En hemeroteca, SIBE-Chetumal, SIBE-San Cristóbal
Sistemática del pez Petenia splendida (Perciformes: Cichlidae) en el lago Petén Itzá, Guatemala
Méndez, Anaitté ; García, María Elena (coaut.) ; Lozano, Lourdes (coaut.) ;
Contenido en: Revista de Biología Tropical Vol. 59, no. 3 (septiembre 2011), p. 1205-1216 ISSN: 0034-7744
Bibliotecas: Chetumal , San Cristóbal
Cerrar
SIBE Chetumal
50994-10 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
50994-20 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal, SIBE-San Cristóbal
PDF
Resumen en: Inglés |
Resumen en inglés

Systematic of the fish Petenia splendida (Perciformes: Cichlidae) of Lake Petén Itzá, Guatemala. The Lake Petén Itzá is located in the multiple use zone of the Maya Biosphere Reserve. It belongs to the subtropical moist forest (warm) life zone, and has very important flora and fauna diversities. Among the fish species, the white fish (Petenia splendida) is of high commercial value. The main goal of the present work was to clarify the taxonomic position of the two forms of the white fish in Petén (Guatemala), and to compare it with the Usumacinta (Mexico) form, based on the collected material from 1978 and 2006 (Usumacinta), and collections made during 2008 and 2009 in the Lake Petén Itzá. Samples were obtained from 10 different locations in the lake. From the total of 57 fish specimens collected, 50 fish were selected (25 yellow form and 25 silver form); besides, 21 specimens from 10 locations of the Usumacinta river in Mexico, from the Fish Collection, FCB, UANL. A total of 36 morphometric and 16 meristic characteristics, were analyzed, and also coloration, habitat and fishing method.

This study reports the P. splendida of the Lake Petén Itzá with the following characteristics: the yellow form at a depth of 0.5-1.5m with dorsal fin XIV-(XV)-XVI/11-(12)-13, the silver form at a depth of 2-3m with dorsal fin XIV-(XV)-XVI/10-(12)-13, and the Usumacinta form with a dorsal fin XIV-(XV)- XV/12-(13)-13. The discrimination analysis demonstrates a differentiation among the three analyzed populations. Some of the characteristics are the ocular diameter, the anal source-pelvic source distance and the dorsal source-anal source distance. The geographic area studied has a high diversity of fish fauna along the watershed, and it is possible to observe the anthropogenic damage, due to the overexploitation based the unapplicability of the existent regulation and the urbanization. If this situatio continues it could jeopardize the survival of this emblematic specie.


2.
Artículo
*En hemeroteca, SIBE-Chetumal
Distribution, diversity and ecology of modern freshwater ostracodes (Crustacea), and hydrochemical characteristics of Lago Petén Itzá, Guatemala
Pérez, Liseth ; Lorenschat, Julia (coaut.) ; Bugja, Rita (coaut.) ;
Contenido en: Journal of Limnology Vol. 69, no. 1 (2010), p. 146-159 ISSN: 1129-5767
Bibliotecas: Chetumal
Cerrar
SIBE Chetumal
48860-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-Chetumal
PDF
Resumen en: Inglés |
Resumen en inglés

We analyzed modern ostracode species assemblages and water column physico-chemical characteristics in Lago Péten Itzá, Guatemala. Lake waters are dominated by sulfate, bicarbonate, calcium and magnesium and display a total ion concentration of ~11 meq L-1. Eleven extant ostracode species were identified. We found higher abundances of living ostracodes, as well as relatively higher species richness (eight species) and biodiversity (H of 1.6) between the littoral zone and a water depth of 20 m. At water depths >40 m, these variables all decreased. The thermocline is located at a water depth of ~20-40 m. Cluster analysis revealed three water depth ranges in the lake of importance to ostracode distribution: 1) littoral zone (0.1-3 m), 2) water depths from the base of the littoral zone to the base of the thermocline (3-40 m), and 3) water depths below the thermocline (40-160 m). The assemblage "Darwinula-Heterocypris-Pseudocandona-Strandesia" is characteristic of waters <15 m. The "Cypridopsis-Cytheridella-Limnocythere" assemblage characterizes waters <40 m and "Physocypria" indicates waters >40 m. Ostracode taxa from Lago Petén Itzá show specific ecological preferences related to water depth and associated physico-chemical characteristics, thus illustrating the potential of ostracodes as indicators of lake level changes and hydrodynamics.


3.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Extant freshwater ostracodes (Crustacea: Ostracoda) from Lago Petén Itzá, Guatemala
Pérez, Liseth ; Lorenschat, Julia (coaut.) ; Brenner, Mark (coaut.) ; Scharf, Burkhard (coaut.) ; Schwalb, Antje (coaut.) ;
Contenido en: Revista de Biología Tropical Vol. 58, no. 3 (setiembre 2010), p. 871-907 ISSN: 0034-7744
Bibliotecas: Chetumal , San Cristóbal
Cerrar
SIBE Chetumal
50233-20 (Disponible)
Disponibles para prestamo: 1
Cerrar
SIBE San Cristóbal
50233-10 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal
PDF
Resumen en: Inglés |
Resumen en inglés

Ostracode taxonomy has been of great interest because of their possible use as indicator species in climate and ecosystem changes. In Central and South America, few studies have been carried out and this study includes a contribution to the group. Eleven ostracode species were collected in Lago Petén Itzá (~100km2), the second largest lowland lake in Guatemala, and from its inflow tributary, Río Ixlú in November 2005 and February 2008. Twenty-seven surface sediment samples were retrieved at water depths from the littoral zone to the lake’s maximum depth (>160m). Hard and soft parts of ostracodes were analyzed, and each ostracode species was described for taxonomy, size, ecology, biology and geographic distribution. Species recorded include: Candonocypris serratomarginata?, Cypretta brevisaepta?, Cypridopsis okeechobei, Cytheridella ilosvayi, Darwinula stevensoni, Heterocypris punctata, Limnocythere opesta, Physocypria globula, Pseudocandona sp., Stenocypris major and Strandesia intrepida. Most of the species have a neotropical distribution, two are distributed world-wide (D. stevensoni and S. major), and C. okeechobei and P. globula display nearctic and neotropical distributions. We present new records of C. brevisaepta?, C. serratomarginata?, S. major, and S. intrepida in Guatemala. Physocypria globula was misidentified previously in Lago Petén Itzá as Cypria petenensis, Pseudocandona sp. was misidentified as Candona sp., and C. okeechobei was identified in the past as C. vidua. Limnocythere opesta is the only endemic species of the Petén Lake District, Guatemala.

The most abundant and widely distributed species in the lake are P. globula, C. okeechobei, and Pseudocandona sp. Species restricted to the littoral zones and water depths <15m are C. brevisaepta?, D. stevensoni, H. punctata, and S. intrepida. Limnocythere opesta, C. ilosvayi, C. okeechobei, and Pseudocandona sp. are distributed from the littoral zone to a depth of 40m. Species collected only in the Ixlú tributary and in a littoral zone on the west side of the lake were C. serratomarginata? and S. major. During November, live adult L. opesta and C. okeechobei were abundant, but no C. brevisaepta? or C. serratomarginata? adults were found. Adult specimens of C. ilosvayi were more abundant in February. In general, ostracodes collected were smaller than those reported in the literature. An accurate taxonomy will improve the use of ostracode fossil assemblages in long sediment cores when reconstructing past climatic and environmental changes in the northern lowland Neotropics.


Resumen en: Inglés |
Resumen en inglés

We employed paleolimnological methods to investigate tropical forest recovery and soil stabilization that followed abandonment of agricultural systems associated with disintegration of Classic Maya polities ca. A.D. 800–1000. We used lithological, geochemical, magnetic, and palynological data from sediment cores of Lake Petén Itzá in the Maya Lowlands of northern Guatemala. Sediment core chronology was developed using radiocarbon dates on terrestrial wood and charcoal fragments. Our results indicate that in the absence of large human populations and extensive farming activities, Petén forests recovered under humid climate conditions within a span of 80–260 yr. Soil stabilization postdates pollen evidence of forest regrowth stratigraphically, and required between 120 and 280 yr. We conclude that the tropical forest ecosystem in the watershed of Lake Petén Itzá had been reestablished by the early Postclassic Period (A.D. 1000–1200).


5.
Artículo
Resumen en: Inglés |
Resumen en inglés

Palynological studies document forest disappearance during the late Holocene in the tropical Maya lowlands of northern Guatemala. The question remains as to whether this vegetation change was driven exclusively by anthropogenic deforestation, as previously suggested, or whether it was partly attributable to climate changes. We report multiple palaeoclimate and palaeoenvironment proxies (pollen, geochemical, sedimentological) from sediment cores collected in Lake Petén Itzá, northern Guatemala. Our data indicate that the earliest phase of late Holocene tropical forest reduction in this area started at not, vert, similar 4500 cal yr BP, simultaneous with the onset of a circum-Caribbean drying trend that lasted for not, vert, similar 1500 yr. This forest decline preceded the appearance of anthropogenically associated Zea mays pollen. We conclude that vegetation changes in Petén during the period from not, vert, similar 4500 to not, vert, similar 3000 cal yr BP were largely a consequence of dry climate conditions. Furthermore, palaeoclimate data from low latitudes in North Africa point to teleconnective linkages of this drying trend on both sides of the Atlantic Ocean.



7.
Artículo
*En hemeroteca, SIBE-San Cristóbal
Tenencia y uso de la tierra en la cuenca del lago Petén Itzá, Guatemala
Milián, Bayron ; Jiménez Otárola, Francisco (coaut.) ; González, Alan (coaut.) ; Prins, Cornelis (coaut.) ; Velásquez, Sergio (coaut.) ;
Contenido en: Recursos Naturales y Ambiente No. 43 (noviembre 2004), p. 110-117 ISSN: 1659-1216
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
B4129 (Disponible)
Disponibles para prestamo: 1
Nota: En hemeroteca, SIBE-San Cristóbal

8.
- Artículo con arbitraje
On the taxonomical status of Arctodiaptomus dampfi brehm (Crustacea: copepoda: diaptomidae) with comments on A. dorsalis (Marsh)
Suárez Morales, Eduardo ; Elías Gutiérrez, Manuel (coaut.) ;
Clasificación: AR/595.347281 / S9
Contenido en: Journal of Limnology Vol. 60, no. 1 (2001), p. 11-18 ISSN: 1723-8633
Bibliotecas: San Cristóbal
Cerrar
SIBE San Cristóbal
ECO010007971 (Disponible)
Disponibles para prestamo: 1
PDF
Resumen en: Inglés |
Resumen en inglés

Arctodiaptomus dampfi Brehm is a diaptomid copepod described from Lake Petén, in Guatemala. Due to the fact that the type material is lost and no additional material was available, the taxonomical status of this species remained unclear for more than 65 years. Arctodiaptomus dampfi has been advanced as a synonym of A. dorsalis and some authors followed this position; instead, others recognized this species in regional checklists. We collected zooplankton samples at Lake Petén, A. dampfi type locality, and compared this material with confirmed museum specimens and material from Louisiana, the type locality of A. dorsalis. Our observations with light microscopy and SEM allowed us to state that A. dampfi is in fact a synonym of A. dorsalis and should be excluded from regional lists. This was concluded after examination and comparison of the taxonomically relevant structures in both groups of specimens. Differences between both groups of specimens were slight. We found significative size differences between the Guatemalan population and the other neotropical and nearctic ones, the former being the smallest sized populations known throughout the known distributional range of A. dorsalis.