First Record of Fossil Insects from the Middle Holocene of Tierra Del Fuego, Argentina

Ramírez, Leonardo César; Pérez, Joan Negre; Alonso, Cecilia P.

doi:10.5710/amgh.23.06.2017.3073

Cited by 4 publications

(2 citation statements)

References 44 publications

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“…The presence of other species from the Anacardiaceae, Fabaceae, and Atherospermataceae families shared with those fossil floras reinforces the idea of the persistence of this forest type in Tierra del Fuego during the Miocene (i.e. Hinojosa & Villagrán, 1997; Olivero et al., 1998; Palamarczuk & Barreda, 2000; Zamaloa, 2000).…”

Section: Discussionsupporting

confidence: 58%

Climate and Vegetation of the Miocene of Tierra del Fuego: Filaret Formation

Sandoval,

Yabe,

Nishida

et al. 2024

Paleoceanog and Paleoclimatol

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The changing climate during the Cenozoic affected the diversity of plants in Patagonia, as species richness tends to increase during warm periods and decrease during cold periods. Precipitation is a significant factor shaping diversity, as shown in the case of central Chile during the Miocene. This study presents a reconstruction of the climate and vegetation in Tierra del Fuego Island, located approximately 52°S, using fossil flora recovered from the Filaret Formation to understand the Miocene epoch, characterized by contrasting global climatic changes. Filaret flora comprises twenty‐seven morpho‐taxa, including nine Nothofagus species and other Gondwanan and Neotropical families, such as Atherospermataceae and Anacardiaceae, in agreement with a forest habitat. Leaf physiognomy climate reconstruction suggests microthermal conditions, with a mean annual temperature of 9.4–11°C and annual precipitation ranging from 985 to 1,130 mm. These conditions are warmer and wetter than the modern record of the area, with a MAT of 6°C and mean annual precipitation of 300 mm. As the Filaret fossil record suggests, the forest habitat under a microthermal climate is consistent with the global climatic reconstruction of the Early Miocene. This Miocene landscape on Tierra del Fuego was possible because the Andes could not rain‐shadow humid westerly winds by this timeframe.

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Section: Discussionsupporting

confidence: 58%

Climate and Vegetation of the Miocene of Tierra del Fuego: Filaret Formation

Sandoval,

Yabe,

Nishida

et al. 2024

Paleoceanog and Paleoclimatol

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“…Particularly, the Coleoptera emerge as the most conspicuous taxa found in the TFA, and within this order the Geadephaga (Darlington 1965; Niemelä 1990; Elgueta et al 2013). The Geadephaga, comprising beetles of the families Carabidae, Cicindelidae, and Trachypachidae, have been extensively studied due to their presence in all terrestrial ecosystems, showcase a signi cant number of relictual taxa (Reichardt 1979, Roig-Juñent 1998, 2021, fossils (Ashworth and Hoganson 1987, Ashworth and Erwin 2016, Ramírez et al 2017, and economic importance (Roig Juñent 2021, 2023. They play key roles in natural and agricultural ecosystems (Thiele 1977), as predators of pest species and other invertebrates and as granivores regulating weed seeds (Nolte et al 2017).…”

Section: Introductionmentioning

confidence: 99%

Geadephaga beetles (Insecta: Coleoptera) from the sub-Antarctic Tierra del Fuego archipelago: Diversity, distribution and taxonomic key

Roig-Juñent,

Griotti,

Miras

et al. 2024

Preprint

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The Tierra del Fuego Archipelago (TFA), situated at the southern tip of South America, confronts ecological challenges attributed to human activities, leading to direct consequences on regional biodiversity. Despite certain areas within the TFA being recognized as global conservation priorities, our comprehension of its invertebrates’ biodiversity remains incomplete. Insects, particularly Geadephaga beetles, play a crucial role in natural and agricultural ecosystems due to their sensitivity to environmental changes and integral functions as predators and granivores. In this contribution, we provide a comprehensive species list of Geadephaga beetles in the TFA, including a taxonomic key, illustrated images of adult specimens, and maps to enhance understanding of their distribution patterns. We report 52 Geadephaga species, including one Cicindelidae and 51 Carabidae, with ten newly recorded species and three new putative taxa. The distribution patterns of Geadephaga in the TFA indicate a higher diversity compared to other sub-Antarctic islands. Distinct patterns associated with the Sub-Antarctic Nothofagus forests, the Magellanic open moorlands, and the Patagonian steppe are identified, revealing the impact of climatic conditions on beetle diversity. This research significantly contributes to understanding the Geadephaga biodiversity and distribution patterns in the TFA, providing valuable tools for taxonomic identifications.

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