Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP

Veena, M.P.; Achyuthan, Hema; Eastoe, C. J.; Farooqui, Anjum

doi:10.1016/j.ancene.2015.04.001

Cited by 11 publications

(3 citation statements)

References 19 publications

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“…According to most of the previous studies conducted to date, an overall weakening trend of SW monsoons together with dry/less-humid condition can be identified during the late Holocene. This is evident in many sedimentary climate archives such as the Horton Plains (Premathilake and Risberg, 2003), Vellayani Lake (Veena et al, 2014b), Nitaya Lake (Quamar and Chauhan, 2012), Lonar Lake (Prasad et al, 2014), Nal Sarovar lake (Prasad et al, 1997), Pokharan lake (Roy et al, 2009) and the Din Gad peat deposit (Phadtare, 2000). Thus, climate proxy records presented in our study agree with the overall weakening trend in SW monsoons since the late Holocene (Fig.…”

Section: Correlation With Other Regional Studiessupporting

confidence: 89%

“…The dry and weak SW monsoon from ~1300 cal yr BP to present suggested in this study matches closely with conditions of less humidity and weak monsoon indicated in the Nitaya Lake in southwestern India (Quamar and Chauhan, 2012). However, other lacustrine records such as the Lonar Lake, Vellayani Lake and Nal Sarovar suggest this dry and weak monsoon phase to extend from 2500 to 2000 cal yr BP (Prasad et al, 2014(Prasad et al, , 1997Veena et al, 2014b; Fig. 5).…”

Section: Correlation With Other Regional Studiessupporting

confidence: 86%

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A multi-proxy reconstruction of the late Holocene climate evolution in Lake Bolgoda, Sri Lanka

Gayantha

Routh

Chandrajith

2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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Palaeoclimate investigations in Sri Lanka have been rarely attempted despite being located directly in the path of the Inter Tropical Convergence Zone. In this study, a 4.1-m undisturbed sediment core was retrieved from the Bolgoda Lake situated in the western coast of Sri Lanka, and influenced by the strong southwest monsoons. Mollusc shells in the core were dated, and the age-depth model indicated a depositional history extending from 2941 cal yr BP to the present. Grain size, major and trace elements, total organic C and N content and stable C and N isotopes were analysed in freeze-dried sediments to reconstruct the palaeoclimate changes.The multi-proxy records in the core revealed four distinct zones that show distinct variations in physical and chemical conditions in the lake associated with climate change. Zone 1 (2941 to 2390 cal yr BP; 385-252 cm) indicated the climate to be warm and humid with intense precipitation. The resulting high lake level helped in organic matter preservation in bottom sediments. Zone 2 (2390 to 1782 cal yr BP; 252-140 cm) indicated an unstable dry period associated with weak precipitation. Consequently, low lake level and intense degradation of organic matter occurred in this zone. Zone 3 (1782 to 1299 cal yr BP; 140-60 cm) indicated a 2 resurgence of intense monsoon along with warm and humid conditions. Zone 4 (1299 cal yr BP to present; 60-0 cm) indicated dry conditions with less intense monsoon, low lake level and extensive degradation of organic matter. Vascular plants were the predominant organic matter source into the lake during the late Holocene. In contrast, algal input was significant between 2390 cal yr BP and 2153 cal yr BP. The palaeoclimate evidences in this study showed an overall weakening trend of SW monsoon during the late Holocene, and this was consistent with changes happening in other locations as in southern and western India.

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Section: Correlation With Other Regional Studiessupporting

confidence: 89%

Section: Correlation With Other Regional Studiessupporting

confidence: 86%

A multi-proxy reconstruction of the late Holocene climate evolution in Lake Bolgoda, Sri Lanka

Gayantha

Routh

Chandrajith

2017

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…That past human impacts on biodiversity, soil/air quality, hydrological patterns, nutrient cycling, and landcover were not negligible, and that these escalated in intensity as production and economies increased in relevance throughout time is hardly new. Although cultural and ecological inheritances were heterogeneous in time and space, this trend appears as a convergent evolutionary pattern in several regions around world (Aikens and Lee, 2013;Braje and Erlandson, 2013a;Brewington et al, 2015;Laparidou and Rosen, 2015;McClure, 2013;Rick et al, 2013;Rosen et al, 2015;Streeter et al, 2015;Veena et al, 2014;Wagreich and Draganits, 2018). In the rest of the Americas, for instance, the acceleration of anthropogenic impacts on terrestrial and coastal ecosystems after the European colonization by the 16 th century is consistently recognized in North America (Dotterweich et al, 2014;Jones, 2015;Lightfoot et al, 2013;Stinchcomb et al, 2014), Amazonia (Arroyo-Kalin, 2012;Piperno et al, 2015;Roosevelt, 2013) and the Caribbean region (Rivera-Collazo, 2015).…”

Section: Discussionmentioning

confidence: 99%

Geohistorical records of the Anthropocene in Chile

Gayó

McRostie

Campbell

et al. 2019

Elementa: Science of the Anthropocene

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The deep-time dynamics of coupled socio-ecological systems at different spatial scales is viewed as a key framework to understand trends and mechanisms that have led to the Anthropocene. By integrating archeological and paleoenvironmental records, we test the hypothesis that Chilean societies progressively escalated their capacity to shape national biophysical systems as socio-cultural complexity and pressures on natural resources increased over the last three millennia. We demonstrate that Pre-Columbian societies intentionally transformed Chile’s northern and central regions by continuously adjusting socio-cultural practices and/or incorporating technologies that guaranteed resource access and social wealth. The fact that past human activities led to cumulative impacts on diverse biophysical processes, not only contradicts the notion of pristine pre-Industrial Revolution landscapes, but suggests that the Anthropocene derives from long-term processes that have operated uninterruptedly since Pre-Columbian times. Moreover, our synthesis suggests that most of present-day symptoms that describe the Anthropocene are rooted in pre-Columbian processes that scaled up in intensity over the last 3000 years, accelerating after the Spanish colonization and, more intensely, in recent decades. The most striking trend is the observed coevolution between the intensity of metallurgy and heavy-metal anthropogenic emissions. This entails that the Anthropocene cannot be viewed as a universal imprint of human actions that has arisen as an exclusive consequence of modern industrial societies. In the Chilean case, this phenomenon is intrinsically tied to historically and geographically diverse configurations in society-environment feedback relationships. Taken collectively with other case studies, the patterns revealed here could contribute to the discussion about how the Anthropocene is defined globally, in terms of chronology, stratigraphic markers and attributes. Furthermore, this deep-time narrative can potentially become a science-based instrument to shape better-informed discourses about the socio-environmental history in Chile. More importantly, however, this research provides crucial “baselines” to delineate safe operating spaces for future socio-ecological systems.

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Anthropogenic Impacts on the Hydrochemical and Geochemical Characteristics of the Vellayani Tropical Freshwater Lake of Kerala, India

Lal,

Vishnu Maya,

Chaithanya

et al. 2024

GIScience and Geo-Environmental Modelling

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Human impact on low-land Vellayani Lake, south India: A record since 3000 yrs BP

Cited by 11 publications

References 19 publications

A multi-proxy reconstruction of the late Holocene climate evolution in Lake Bolgoda, Sri Lanka

A multi-proxy reconstruction of the late Holocene climate evolution in Lake Bolgoda, Sri Lanka

Geohistorical records of the Anthropocene in Chile

Anthropogenic Impacts on the Hydrochemical and Geochemical Characteristics of the Vellayani Tropical Freshwater Lake of Kerala, India

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