Fish trophic divergence along a lake productivity gradient revealed by historic patterns of invasion and eutrophication

2013 ◽  
Vol 58 (12) ◽  
pp. 2517-2531 ◽  
Author(s):  
Quenton M. Tuckett ◽  
Kevin S. Simon ◽  
Jasmine E. Saros ◽  
David B. Halliwell ◽  
Michael T. Kinnison
Keyword(s):  
Lake Productivity ◽  
Productivity Gradient

scholarly journals 8,000 years of climate, vegetation, fire and land-use dynamics in the thermo-mediterranean vegetation belt of northern Sardinia (Italy)

2021 ◽  
Author(s):  
Tiziana Pedrotta ◽  
Erika Gobet ◽  
Christoph Schwörer ◽  
Giorgia Beffa ◽  
Christoph Butz ◽  
...  
Keyword(s):  
Land Use ◽  
Bronze Age ◽  
Fire History ◽  
Vegetation History ◽  
Juglans Regia ◽  
Fire Disturbance ◽  
Lake Productivity ◽  
The Past ◽  
Evergreen Oak ◽  
The Bronze Age

AbstractKnowledge about the vegetation history of Sardinia, the second largest island of the Mediterranean, is scanty. Here, we present a new sedimentary record covering the past ~ 8,000 years from Lago di Baratz, north-west Sardinia. Vegetation and fire history are reconstructed by pollen, spores, macrofossils and charcoal analyses and environmental dynamics by high-resolution element geochemistry together with pigment analyses. During the period 8,100–7,500 cal bp, when seasonality was high and fire and erosion were frequent, Erica arborea and E. scoparia woodlands dominated the coastal landscape. Subsequently, between 7,500 and 5,500 cal bp, seasonality gradually declined and thermo-mediterranean woodlands with Pistacia and Quercus ilex partially replaced Erica communities under diminished incidence of fire. After 5,500 cal bp, evergreen oak forests expanded markedly, erosion declined and lake levels increased, likely in response to increasing (summer) moisture availability. Increased anthropogenic fire disturbance triggered shrubland expansions (e.g. Tamarix and Pistacia) around 5,000–4,500 cal bp. Subsequently around 4,000–3,500 cal bp evergreen oak-olive forests expanded massively when fire activity declined and lake productivity and anoxia reached Holocene maxima. Land-use activities during the past 4,000 years (since the Bronze Age) gradually disrupted coastal forests, but relict stands persisted under rather stable environmental conditions until ca. 200 cal bp, when agricultural activities intensified and Pinus and Eucalyptus were planted to stabilize the sand dunes. Pervasive prehistoric land-use activities since at least the Bronze Age Nuraghi period included the cultivation of Prunus, Olea europaea and Juglans regia after 3,500–3,300 cal bp, and Quercus suber after 2,500 cal bp. We conclude that restoring less flammable native Q. ilex and O. europaea forest communities would markedly reduce fire risk and erodibility compared to recent forest plantations with flammable non-native trees (e.g. Pinus, Eucalyptus) and xerophytic shrubland (e.g. Cistus, Erica).

Effects of land-use changes on plant functional and taxonomic diversity along a productivity gradient in wet meadows

2013 ◽  
Vol 24 (5) ◽  
pp. 898-909 ◽  
Author(s):  
Š. Janeček ◽  
F. de Bello ◽  
J. Horník ◽  
M. Bartoš ◽  
T. Černý ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
Taxonomic Diversity ◽  
Wet Meadows ◽  
Productivity Gradient ◽  
Effects Of Land Use

scholarly journals Ant Abundance along a Productivity Gradient: Addressing Two Conflicting Hypotheses

PLoS ONE ◽  
2015 ◽  
Vol 10 (7) ◽  
pp. e0131314 ◽  
Author(s):  
Udi Segev ◽  
Jaime Kigel ◽  
Yael Lubin ◽  
Katja Tielbörger
Keyword(s):  
Productivity Gradient

Spatial Variability of Organic Carbon, CaCO3 and Nutrient Burial Rates Spanning a Mangrove Productivity Gradient in the Coastal Everglades

Ecosystems ◽  
2018 ◽  
Vol 22 (4) ◽  
pp. 844-858 ◽  
Author(s):  
Joshua L. Breithaupt ◽  
Joseph M. Smoak ◽  
Christian J. Sanders ◽  
Tiffany G. Troxler
Keyword(s):  
Organic Carbon ◽  
Spatial Variability ◽  
Productivity Gradient ◽  
Burial Rates
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