Exploitation ecosystems in heterogeneous habitat complexes

1990 ◽  
Vol 4 (3) ◽  
pp. 220-234 ◽  
Author(s):  
Tarja Oksanen
Keyword(s):  
Heterogeneous Habitat ◽  
Exploitation Ecosystems

The Logic and Realism of the Hypothesis of Exploitation Ecosystems

2000 ◽  
Vol 155 (6) ◽  
pp. 703 ◽  
Author(s):  
Oksanen ◽  
Oksanen
Keyword(s):  
Exploitation Ecosystems

Distribution of Bark Procyanidin Contents in Pinus yunnanensis Populations and Related Species

2021 ◽  
Vol 15 (1) ◽  
pp. 105-111
Author(s):  
Xiaolong Zhang ◽  
Hong Yu ◽  
Lin Chen ◽  
Chuntang Mao ◽  
Yuanbing Wang ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Regression Model ◽  
Related Species ◽  
High Variability ◽  
Quadratic Regression ◽  
Quadratic Regression Model ◽  
Pinus Yunnanensis ◽  
Northwest Yunnan ◽  
Heterogeneous Habitat ◽  
Genetic And Environmental Factors

The distribution of the bark procyanidin contents in 26 populations of Pinus yunnanensis and 8 populations of P. kesiya var. langbianensis and 5 populations of P. densata was determined. The results indicated that genetic and environmental factors commonly affected the procyanidin content in the populations of P. yunnanensis and related species. The procyanidin contents in the three related species followed the order of P. densata (54.72 mg/g) > P. kesiya (43.86 mg/g) > P. yunnanensis (37.95 mg/g). Furthermore, the procyanidin content in P. yunnanensis and related species had high variability. The procyanidin contents in the three related species showed that the procyanidin contents of P. densata distributed in northwest Yunnan and P. kesiya distributed in southern Yunnan were high, the procyanidin content of the population with introgression and hybridization or a heterogeneous habitat was also high, and that of P. yunnanensis distributed in central Yunnan was low. The quadratic regression model of procyanidin content and latitude was Y = 1329.06 -100.52* Latitude +1.95 * Latitude2.

scholarly journals Butterfly diversity in heterogeneous habitat of Bankura, West Bengal, India

2020 ◽  
Vol 12 (8) ◽  
pp. 15804-15816
Author(s):  
Kalyan Mukherjee ◽  
Ayan Mondal
Keyword(s):  
West Bengal ◽  
Diversity Indices ◽  
Species Number ◽  
Butterfly Species ◽  
Gangetic Plain ◽  
Butterfly Diversity ◽  
Heterogeneous Habitats ◽  
Heterogeneous Habitat ◽  
Chotanagpur Plateau ◽  
Bankura District

Butterfly diversity was observed in different habitats of Bankura District, West Bengal, India.  This district is located at the junction of Chotanagpur plateau and Gangetic plain; it contains a variety of transitional habitats.  We found 117 butterfly species from our covered survey area.  The highest species recorded in the present study belonged to family Lycaenidae (30.76%) and Nymphalidae (29.91%) followed by Hesperiidae (16.23%), Pieridae (13.67%), Papilionidae (8.54%), and Riodinidae (0.85%), respectively.  Based on sighting we found that 12.82% of all the butterflies recorded were abundant in nature while 21.36% were very common, 41.88% were frequent, and 23.93% were rare. Cluster analysis and other diversity indices gives us an overall idea about environmental health.  The pattern of diversity change from plain to plateau gradient gives important insight about ecological edge effect.  High species number in relation with low individual numbers were found in forest habitat.  This preliminary study showed that heterogeneous habitats could harbour many butterflies and need proper conservation efforts to sustain it. 

scholarly journals Genetic and epigenetic variations associated with adaptation to heterogeneous habitat conditions in a deciduous shrub

2018 ◽  
Vol 8 (5) ◽  
pp. 2594-2606 ◽  
Author(s):  
Liu Lele ◽  
Du Ning ◽  
Pei Cuiping ◽  
Guo Xiao ◽  
Guo Weihua
Keyword(s):  
Habitat Conditions ◽  
Heterogeneous Habitat ◽  
Deciduous Shrub

scholarly journals The Ascidian-Derived Metabolites with Antimicrobial Properties

Antibiotics ◽  
2020 ◽  
Vol 9 (8) ◽  
pp. 510 ◽  
Author(s):  
Marcello Casertano ◽  
Marialuisa Menna ◽  
Concetta Imperatore
Keyword(s):  
Direct Evidence ◽  
Marine Invertebrates ◽  
Antimicrobial Properties ◽  
Therapeutic Agents ◽  
Symbiotic Association ◽  
Heterogeneous Habitat ◽  
Microbial Infections ◽  
Sulfur Containing ◽  
Shed Light ◽  
Antibacterial Potential

Among the sub-phylum of Tunicate, ascidians represent the most abundant class of marine invertebrates, with 3000 species by heterogeneous habitat, that is, from shallow water to deep sea, already reported. The chemistry of these sessile filter-feeding organisms is an attractive reservoir of varied and peculiar bioactive compounds. Most secondary metabolites isolated from ascidians stand out for their potential as putative therapeutic agents in the treatment of several illnesses like microbial infections. In this review, we present and discuss the antibacterial activity shown by the main groups of ascidian-derived products, such as sulfur-containing compounds, meroterpenes, alkaloids, peptides, furanones, and their derivatives. Moreover, the direct evidence of a symbiotic association between marine ascidians and microorganisms shed light on the real producers of many extremely potent marine natural compounds. Hence, we also report the antibacterial potential, joined to antifungal and antiviral activity, of metabolites isolated from ascidian-associate microorganisms by culture-dependent methods.

Habitat association in populations on landscapes with continuous-valued heterogeneous habitat quality

2013 ◽  
Vol 317 ◽  
pp. 47-54 ◽  
Author(s):  
David E. Hiebeler ◽  
Isaac J. Michaud ◽  
Ben A. Wasserman ◽  
Timothy D. Buchak
Keyword(s):  
Habitat Quality ◽  
Habitat Association ◽  
Heterogeneous Habitat

scholarly journals MICROSTRUCTURE OF SUMMER ACTIVITY BOUTS OF DEGUS IN A THERMALLY HETEROGENEOUS HABITAT

2004 ◽  
Vol 85 (2) ◽  
pp. 260-267 ◽  
Author(s):  
G. J. Kenagy ◽  
Rodrigo A. Vásquez ◽  
Brian M. Barnes ◽  
Francisco Bozinovic
Keyword(s):  
Heterogeneous Habitat

Timing of breeding, habitat preference and reproductive success of marsh harriers (Circus aeruginosus)

Biologia ◽  
2008 ◽  
Vol 63 (2) ◽  
Author(s):  
Iva Němečková ◽  
Vojtěch Mrlík ◽  
Pavel Drozd
Keyword(s):  
Reproductive Success ◽  
Reproductive Output ◽  
Common Reed ◽  
Breeding Birds ◽  
Breeding Habitat ◽  
Breeding Period ◽  
Phragmites Communis ◽  
Circus Aeruginosus ◽  
Heterogeneous Habitat ◽  
The Common

AbstractDuring 2002–2005 we analyzed Lack’s Hypothesis about the timing of the breeding of marsh harriers (Circus aeruginosus) in the Poodří to the breeding period and preference of heterogeneous habitat. An analysis of 43 nests revealed quantitative differences. Birds which started breeding earlier, reached significantly higher reproductive success than later breeding birds regardless of nesting habitat (P = 0.003, n nests = 43). Even when the birds invested into their offspring the same way, their breeding success was not always the same. When the females nested in the common reed (Phragmites communis), they reached higher reproductive output than females nesting in cattail (Typha sp.) (P = 0.01, n cattail = 18, n common reed = 25). The habitat of the common reed is characterized by higher and denser vegetation cover than cattail vegetation (P < 0.001, n measurements = 174 for both variables).

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