Erosive features caused by a Magellanic penguin (Spheniscus magellanicus) colony on Martillo Island, Beagle Channel, Argentina

  1. D.R.A. Quiroga 1
  2. A. Coronato 1
  3. G. Scioscia 1
  4. A. Raya-Rey 1
  5. A. Schiavini 1
  6. Javier Santos González 2
  7. C.R. Lopez 1
  8. J.M. Redondo Vega 2
  1. 1 Consejo Nacional de Investigaciones Científicas y Técnicas
    info

    Consejo Nacional de Investigaciones Científicas y Técnicas

    Buenos Aires, Argentina

    ROR https://ror.org/03cqe8w59

  2. 2 Universidad de León
    info

    Universidad de León

    León, España

    ROR https://ror.org/02tzt0b78

Revista:
Cuadernos de investigación geográfica: Geographical Research Letters

ISSN: 0211-6820,  1697-9540

Any de publicació: 2020

Volum: 46

Número: 2

Pàgines: 477-496

Tipus: Article

DOI: 10.18172/CIG.4337 DIALNET GOOGLE SCHOLAR lock_openDialnet editor

Altres publicacions en: Cuadernos de investigación geográfica: Geographical Research Letters

Objectius de Desenvolupament Sostenible

Resum

An active Magellanic penguin (Spheniscus magellanicus) colony has been established on Martillo Island, Beagle Channel (54°54´26” S; 67°22´58” W) since 1976. It is located in remnants of eroded drumlins placed in both ending and joined by gravel terraces of glaciofluvial and marine origin. Forest patches occupy the eastern side of the island while most of the island is covered by bushes, tussocks and grasses. This paper presents penguins as bio-erosion agents on glacial and marine landforms. An analysis of multiple criteria surveyed in the field was performed, using Quantum GIS® 3.2.1 with remote sensing images and a digital model terrain of 12 m resolution. The morphometric data and multicriterial evaluation were collected during 2016-2017 austral summer. Soils and sediments of each landform (drumlin, glaciofluvial terrace, raised beach and beach) were sampled for particle size analysis, to determine if there is any relationship between the morphometric parameters of the cave and the sediments. Four bio-erosion classes were defined based on the erosion features observed in the field. “Moderate” was the prevailing erosion class recorded, in the E-NE part of the island. Bio-erosion features are mainly developed on the N facing slope of the east of the island, where a natural gully drains rainfall water, and over the glaciofluvial and marine terrace surfaces. Erosive features such as caves and bridges are mainly developed in silty drumlins. Pedestals are developed on bare soils and tussocks. Trails and cracks were also described as bio-erosion. No erosive features were recorded in the W part of the island. The bio-erosion map is one of the inputs for environmental degradation analysis and population dynamic research which is being done in the Magellanic penguin colony on Martillo Island, Beagle Channel.

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Funds were provided by Wildlife Conservation Society, PUE-CONICET 2016-0077; PICT 2014-1870.

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