scholarly journals Extreme group sizes in a colonial bird favored during a rare climatic event

Ecosphere ◽  
2018 ◽  
Vol 9 (9) ◽  
pp. e02428
Author(s):  
Charles R. Brown ◽  
Mary Bomberger Brown
Keyword(s):  
Colonial Bird ◽  
Climatic Event

scholarly journals Holocene vegetation record of upland northern Calabria, Italy: Environmental change and human impact

The Holocene ◽  
2019 ◽  
Vol 29 (4) ◽  
pp. 633-647 ◽  
Author(s):  
Jan Sevink ◽  
Corrie C Bakels ◽  
Peter AJ Attema ◽  
Mauro A Di Vito ◽  
Ilenia Arienzo
Keyword(s):  
Bronze Age ◽  
Forest Decline ◽  
Human Impacts ◽  
Time Frame ◽  
Archaeological Record ◽  
Pollen Data ◽  
Plant Remains ◽  
Middle Bronze Age ◽  
Climatic Event ◽  
Mobile Pastoralism

Earlier studies on Holocene fills of upland lakes (Lago Forano and Fontana Manca) in northern Calabria, Italy, showed that these hold important palaeoecological archives, which however remained poorly dated. Their time frame is improved by new 14C dates on plant remains from new cores. Existing pollen data are reinterpreted, using this new time frame. Two early forest decline phases are distinguished. The earliest is linked to the 4.2 kyr BP climatic event, when climate became distinctly drier, other than at Lago Trifoglietti on the wetter Tyrrhenian side, where this event is less prominent. The second is attributed to human impacts and is linked to middle-Bronze Age mobile pastoralism. At Fontana Manca (c. 1000 m a.s.l.), it started around 1700 BC, in the higher uplands a few centuries later (Lago Forano, c. 1500 m a.s.l.). In the Fontana Manca fill, a thin tephra layer occurs, which appears to result from the AP2 event (Vesuvius, c. 1700 BC). A third, major degradation phase dates from the Roman period. Land use and its impacts, as inferred from the regional archaeological record for the Raganello catchment, are confronted with the impacts deduced from the palaeoarchives.

The North Atlantic atmosphere-sea surface 14C gradient during the Younger Dryas climatic event

1994 ◽  
Vol 126 (4) ◽  
pp. 275-287 ◽  
Author(s):  
Edouard Bard ◽  
Maurice Arnold ◽  
Jan Mangerud ◽  
Martine Paterne ◽  
Laurent Labeyrie ◽  
...  
Keyword(s):  
North Atlantic ◽  
Younger Dryas ◽  
Sea Surface ◽  
The North ◽  
Climatic Event ◽  
The North Atlantic

Numerical modeling to predict the spread of landslide of schist’s area under climatic event of Ain El Hammam (Algeria)

2017 ◽  
Vol 10 (16) ◽  
Author(s):  
Hizia Zerarka ◽  
Mustapha Akchiche ◽  
Florent Prunier
Keyword(s):  
Numerical Modeling ◽  
Climatic Event

scholarly journals Dynamical mechanisms associated to the occurrence of an extreme climatic event of precipitation in the city of Salvador-BA

2016 ◽  
Vol 9 (7) ◽  
Author(s):  
Ana Paula Paes dos Santos ◽  
Maria Regina da Silva Aragão ◽  
José Guilherme Martins dos Santos ◽  
Francisco José Lopes de Lima ◽  
Sérgio Rodrigo Quadro dos Santos ◽  
...  
Keyword(s):  
Extreme Climatic Event ◽  
Climatic Event ◽  
The City

scholarly journals Duration of colonial bird species egg incubation

2018 ◽  
Vol 7 (1) ◽  
pp. 58-64
Author(s):  
Yuri Gennadievich Lamekhov
Keyword(s):  
Ordinal Number ◽  
Bird Species ◽  
Early Ontogeny ◽  
Egg Laying ◽  
Early Ontogenesis ◽  
Time Interval ◽  
Egg Incubation ◽  
Colonial Bird ◽  
Incubation Duration ◽  
Colonial Settlement

The paper deals with one of the aspects of bird early ontogenesis biology - egg incubation duration, which was defined as the time interval between egg laying and hatching from it. The oomorphological parameters are determined taking into account the ordinal number of the laid eggs. Parameters of early ontogeny of birds are studied on the example of colonially nesting species: blackberry toadstool ( Podiceps nigricollis C.L. Brehm.) and lake gull ( Larus ridibundus L.). Within the colonial settlement of these species, the biological center and the periphery of the colony were isolated. When studying the parameters of early ontogeny of birds and oomorphological characteristics, the same number of eggs was taken into account. During field and laboratory studies it was found that the incubation of eggs lasts longer in eggs from the nests of the biological center of the colony. The first eggs are incubated longer. These features clearly manifested in the early ontogeny of the gull. The increase in the egg incubation duration occurs against the background of an increase in their mass and a decrease in the concentration of lysozyme in the protein shell of the egg. Egg incubation duration is one of the results of embryonalization as a way of evolution of ontogeny. The manifestation of the results of embryogenesis was revealed for the first eggs in the nests of the biological center of the colony. Embryonalization leads to an increase in egg incubation duration as well as to a decrease in the intensity of elimination in early ontogenesis, which affects the number of individuals breeding in the colony and, accordingly, the structure of the colonial settlement of birds.

Evidence for the Younger Dryas climatic event in Southeast Asia

1995 ◽  
Vol 14 (9) ◽  
pp. 949-958 ◽  
Author(s):  
Bernard Kevin Maloney
Keyword(s):  
Southeast Asia ◽  
Younger Dryas ◽  
Climatic Event

scholarly journals Public information affects breeding dispersal in a colonial bird: kittiwakes cue on neighbours

2008 ◽  
Vol 4 (5) ◽  
pp. 538-540 ◽  
Author(s):  
Thierry Boulinier ◽  
Karen D McCoy ◽  
Nigel G Yoccoz ◽  
Julien Gasparini ◽  
Torkild Tveraa
Keyword(s):  
Breeding Success ◽  
Evolutionary Ecology ◽  
Local Level ◽  
Public Information ◽  
Breeding Site ◽  
Rissa Tridactyla ◽  
Colonial Bird ◽  
Colonial Seabird ◽  
Local Breeding ◽  
Colonial Breeding

Habitat selection and dispersal behaviour are key processes in evolutionary ecology. Recent studies have suggested that individuals may use the reproductive performance of conspecifics as a source of public information on breeding patch quality for dispersal decisions, but experimental evidence is still limited for species breeding in aggregates, i.e. colonial species. We addressed this issue by manipulating the local breeding success of marked individuals and that of their neighbours on a series of breeding patches of a colonial seabird, the black-legged kittiwake ( Rissa tridactyla ). Based on previous observations in this species, we predicted that individuals that lost their eggs on successful patches would attend their nest and come back to it the year after at a higher rate than individuals that lost their eggs on patches where their neighbours were also in failure. As predicted, the attendance of breeders and prospectors was strongly affected by the local level of breeding success, resulting in differential site fidelity and recruitment. This suggests that individuals used information conveyed by conspecific breeding performance to make decisions relative to breeding site selection. This process can amplify the response of these populations to environmental change and may have contributed to the evolution of colonial breeding.

Response of estuarine fish assemblages to an atypical climatic event in northeastern Brazil

2020 ◽  
Vol 35 ◽  
pp. 101121
Author(s):  
Caroline Stefani da Silva Lima ◽  
Maria Luísa de Araújo Souto Badú ◽  
André Luiz Machado Pessanha
Keyword(s):  
Fish Assemblages ◽  
Northeastern Brazil ◽  
Estuarine Fish ◽  
Climatic Event

scholarly journals Onset of the Younger Dryas Recorded with 14C at Annual Resolution in French Subfossil Trees

Radiocarbon ◽  
2019 ◽  
Vol 62 (4) ◽  
pp. 901-918 ◽  
Author(s):  
Manuela Capano ◽  
Cécile Miramont ◽  
Lisa Shindo ◽  
Frédéric Guibal ◽  
Christian Marschal ◽  
...  
Keyword(s):  
North Atlantic ◽  
Younger Dryas ◽  
Statistical Comparison ◽  
The North ◽  
Climatic Event ◽  
The Mean ◽  
The Last Two Millennia ◽  
Matching Techniques ◽  
Annual Resolution

ABSTRACTSubfossil trees with their annual rings constitute the most accurate and precise archive to calibrate the radiocarbon (14C) method. The Holocene part of the IntCal curve is based on tree-ring chronologies, absolutely dated by dendrochronological matching. For the Northern Hemisphere, the absolute curve starts at 12,325 cal BP. For the early part of the Younger Dryas (YD) climatic event (≈ 12,850–11,650 cal BP), there are only a few floating dendrochronological sequences, mainly from Switzerland and France. We present new 14C results from subfossil trees (Pinus sylvestris L.) collected from the Barbiers site (southeast French Alps). The dendrochronological series covers 416 years, corresponding to the onset of the YD period. In order to date our sequence, we matched it with the 14C record based on kauri trees from New Zealand. The Barbiers data were first averaged at the same decadal resolution as the kauri record. Statistical comparison of the different averaging options and matching techniques enables dating the Barbiers sequence to 13,008–12,594 ±10 cal BP, which thus includes the boundary between the Allerød and YD events. The new Barbiers record allows to calculate the 14C inter-hemispheric gradient (14C-IHG) during the period overlapping the kauri sequence. For the optimal dating option, the mean 14C-IHG is 37 yr with a standard deviation (SD) of 21 yr based on 43 decadal estimations (−6‰ with SD of 2‰). The 14C-IHG record exhibits minimal values, down to zero, between 12,960–12,840 cal BP. Excluding these minima leads to an average 14C-IHG of 45 yr with a SD of 14 yr based on 33 decadal values, in agreement with observations for the last two millennia. The Barbiers record suggests a 14C-IHG increase between the end of the Allerød period (IHG of 37 yr with SD of 14 yr) and the early part of the YD (IHG of 48 yr with SD of 14 yr), which is compatible with previously reported drop of deep-water convection in the North-Atlantic and the associated increase in wind-driven upwelling in the Southern Ocean.

Sign in / Sign up

Export Citation Format

Share Document