Comparison of the population structure and dynamics of Aristeus antennatus (Risso, 1816) between exploited and unexploited areas in the Mediterranean Sea

2005 ◽  
Vol 76 (1) ◽  
pp. 22-38 ◽  
Author(s):  
G. D’Onghia ◽  
F. Capezzuto ◽  
Ch. Mytilineou ◽  
P. Maiorano ◽  
K. Kapiris ◽  
...  
Keyword(s):  
Population Structure ◽  
Mediterranean Sea ◽  
Structure And Dynamics ◽  
The Mediterranean ◽  
Population Structure And Dynamics ◽  
Aristeus Antennatus

scholarly journals Structure and dynamics of a Cariniana estrellensis (Lecythidaceae) population in a fragment of Atlantic Forest in Minas Gerais, Brazil

Rodriguésia ◽  
2012 ◽  
Vol 63 (2) ◽  
pp. 257-267 ◽  
Author(s):  
Yule Roberta Ferreira Nunes ◽  
Miguel Petrere Jr.
Keyword(s):  
Population Structure ◽  
Seed Production ◽  
Size Structure ◽  
Canopy Cover ◽  
High Rate ◽  
Structure And Dynamics ◽  
Seedling Bank ◽  
Phase Size ◽  
Population Structure And Dynamics ◽  
Establishment Phase

We aimed to describe population structure and dynamics of Cariniana estrellensis (Raddi) Kuntze to test the hypothesis that this species survives in the forest by forming a seedling bank. We evaluated seed germination, spatial distribution, and recruitment, growth and mortality rates of young individuals. To characterize population structure a 1.2-ha plot was defined, where reproductive adults were mapped; also 100 6 m² sub-plots were established to characterize structure and monitor dynamics of young individuals. We estimated seed production using seed collectors and determined the percentage of canopy cover by hemispherical photographs. Seed rain and saplings showed clustered distribution indicating habitat-patch formation. Sapling mortality occurred mainly during the initial establishment phase. Size structure was characterized by many saplings (X = 9,763 individuals ha-1) and few adults (X = 5 individuals ha-1), associated with a high rate of seed production (X = 60,800 seeds ha-1), low growth rates (X = 2.37 cm ano-1) and mortality (15.66%) of established saplings, showing that species invest in seedling bank formation as a reproductive strategy.

scholarly journals Ecological opportunities and specializations shaped genetic divergence in a highly mobile marine top predator

2014 ◽  
Vol 281 (1795) ◽  
pp. 20141558 ◽  
Author(s):  
Marie Louis ◽  
Michael C. Fontaine ◽  
Jérôme Spitz ◽  
Erika Schlund ◽  
Willy Dabin ◽  
...  
Keyword(s):  
Population Structure ◽  
Mediterranean Sea ◽  
Environmental Changes ◽  
Demographic History ◽  
World Ocean ◽  
Ecological Niches ◽  
Morphological Divergence ◽  
Evolutionary Diversification ◽  
The Mediterranean ◽  
Population Demographic

Environmental conditions can shape genetic and morphological divergence. Release of new habitats during historical environmental changes was a major driver of evolutionary diversification. Here, forces shaping population structure and ecotype differentiation (‘pelagic’ and ‘coastal’) of bottlenose dolphins in the North-east Atlantic were investigated using complementary evolutionary and ecological approaches. Inference of population demographic history using approximate Bayesian computation indicated that coastal populations were likely founded by the Atlantic pelagic population after the Last Glacial Maxima probably as a result of newly available coastal ecological niches. Pelagic dolphins from the Atlantic and the Mediterranean Sea likely diverged during a period of high productivity in the Mediterranean Sea. Genetic differentiation between coastal and pelagic ecotypes may be maintained by niche specializations, as indicated by stable isotope and stomach content analyses, and social behaviour. The two ecotypes were only weakly morphologically segregated in contrast to other parts of the World Ocean. This may be linked to weak contrasts between coastal and pelagic habitats and/or a relatively recent divergence. We suggest that ecological opportunity to specialize is a major driver of genetic and morphological divergence. Combining genetic, ecological and morphological approaches is essential to understanding the population structure of mobile and cryptic species.

Population structure and dynamics of Arctic willow (Salix arctica ) in the High Arctic

2014 ◽  
Vol 41 (10) ◽  
pp. 1967-1978 ◽  
Author(s):  
Noémie Boulanger-Lapointe ◽  
Esther Lévesque ◽  
Stéphane Boudreau ◽  
Gregory H. R. Henry ◽  
Niels Martin Schmidt
Keyword(s):  
Population Structure ◽  
High Arctic ◽  
Structure And Dynamics ◽  
Salix Arctica ◽  
Population Structure And Dynamics

Dioxin compounds in the deep-sea rose shrimp Aristeus antennatus (Risso, 1816) throughout the Mediterranean Sea

2006 ◽  
Vol 53 (12) ◽  
pp. 1895-1906 ◽  
Author(s):  
Guiomar Rotllant ◽  
Esteban Abad ◽  
Francisco Sardà ◽  
Manuela Ábalos ◽  
Joan B. Company ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Deep Sea ◽  
The Mediterranean ◽  
Aristeus Antennatus

Population structure and dynamics of insecticide resistance genes in Culex pipiens populations from Italy

Heredity ◽  
1998 ◽  
Vol 81 (3) ◽  
pp. 342-348 ◽  
Author(s):  
Francesco Silvestrini ◽  
Carlo Severini ◽  
Valeria di Pardo ◽  
Roberto Romi ◽  
Elvira de Matthaeis ◽  
...  
Keyword(s):  
Population Structure ◽  
Insecticide Resistance ◽  
Resistance Genes ◽  
Culex Pipiens ◽  
Structure And Dynamics ◽  
Population Structure And Dynamics

Sustainable yield of the red swamp crayfish (Procambarus clarkii) through understanding its population structure and dynamics in Poyang Lake

Crustaceana ◽  
2012 ◽  
Vol 85 (4-5) ◽  
pp. 415-431 ◽  
Author(s):  
Yu Huang ◽  
Shu Jun Wang ◽  
Yin Gen Dai ◽  
Chun Lin Fang ◽  
Ming He Xiao ◽  
...  
Keyword(s):  
Population Structure ◽  
Procambarus Clarkii ◽  
Poyang Lake ◽  
Population Analysis ◽  
Biological Data ◽  
Sustainable Yield ◽  
Fishery Resource ◽  
Structure And Dynamics ◽  
Red Swamp Crayfish ◽  
Population Structure And Dynamics

With increasing commercial demand for its delicacy, Procambarus clarkii has become an important fishery resource of Poyang Lake in recent years. However, habitat loss, overfishing, and the crayfish plague have diminished P. clarkii populations throughout their area of distribution. In consequence, this study systemically analyses the population structure and dynamics of P. clarkii in the wetland of Poyang Lake using the analytical methods of Bhattacharya and Von Bertalanffy. The main purpose was to collect biological data necessary for the management of this species. The present study showed that the population structure consisted of a maximum of 5.58 age classes for females and 3.25 for males, which indicated that P. clarkii is a relatively short-lived species. The Y′/R analysis showed that Epresent > E0.5, which exceeded the optimization (Eopt) criterion of 0.5 for sustainable exploitation of fisheries, so this species was overexploited in Poyang Lake. The Lc (mean length at first capture) equals 67.5 mm. The estimated mesh size for catching the red swamp crayfish is 13.5 cm. The virtual population analysis model (VPA) showed that the largest annual catch of P. clarkii is 3.43 × 104 t. The Maximum Sustainable Yield (MSY) is 1.18 × 104 t. The low natural mortality rate range of 0.68-1.11 year−1 suggested that it is ecologically worthwhile to allow the individuals of P. clarkii to grow to larger sizes in order to contribute to the biomass for biologically optimal exploitation. This could be facilitated by the adoption of measures involving a closed season, which would help to conserve the fishery.

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