Results 1 to 10 of about 328,369 (286)

Evaluation of Toxicity Potential and Spatial Distribution of Ecological Risk of Heavy Metals in Surface Sediments of Anzali International Wetland Using GIS [PDF]

open access: yesعلوم محیطی, 2022
Introduction; Due to the potential toxicity and ecological risk of heavy metals in aquatic ecosystems, measuring and evaluating their concentration in different parts of aquatic environments is very necessary.
Zhaleh Amini   +3 more
doaj   +1 more source

Adults have more male-biased sex ratios than first-winter juveniles in wintering duck populations

open access: yesAvian Research, 2021
Background The long-term monitoring of demographic changes in waterbird populations remains limited, but such information can be valuable for conservationists and waterbird managers.
Kevin A. Wood   +3 more
doaj   +1 more source

Behavioural and energetic consequences of competition among three overwintering swan (Cygnus spp.) species

open access: yesAvian Research, 2021
Background Winter numbers of the northwest European population of Bewick’s Swans (Cygnus columbianus bewickii) declined recently by c. 40%. During the same period, numbers of two sympatric and ecologically-similar congeners, the Mute Swan (Cygnus olor ...
Kevin A. Wood   +3 more
doaj   +1 more source

Bold Frogs or Shy Toads? How Did the COVID-19 Closure of Zoological Organisations Affect Amphibian Activity?

open access: yesAnimals, 2021
Amphibians are an understudied group in the zoo-focussed literature. Whilst commonly housed in specialist exhibits and of real conservation value due to the global extinction crisis, amphibian welfare is not often investigated empirically in zoo settings.
Jack Boultwood   +2 more
doaj   +1 more source

Grazing Exclusion Changed the Complexity and Keystone Species of Alpine Meadows on the Qinghai-Tibetan Plateau

open access: yesFrontiers in Ecology and Evolution, 2021
Grazing exclusion is an effective approach to restore degraded grasslands. However, the effects of grazing exclusion on keystone species and the complexity of plant community were poorly investigated.
Yong Zhang   +7 more
doaj   +1 more source

Complete mitochondrial genome of Yunnan-Guizhou Plateau endemic fish, Discogobio macrophysallidos, in China

open access: yesMitochondrial DNA. Part B. Resources, 2020
The complete mitochondrial genome of Discogobio macrophysallidos was first determined and analyzed in this work. Its mitochondrial genome is 16,593 bp in length, consisting of 13 protein-coding genes, 22 transfer RNA (tRNA) genes, two ribosomal RNA (rRNA)
Yuping Qiu, Jinjin Jin, Guozhu Chen
doaj   +1 more source

Evolutionary correlation of water-related traits between different structures of Dendrobium plants

open access: yesBotanical Studies, 2020
Background Leaf water conservation and pseudobulb water storage are two of the strategies commonly employed by epiphytic plants to adapt to dry environments.
Mei Sun   +3 more
doaj   +1 more source

Economic Governance to Expand Commercial Wetlands: Within- and Cross-Scale Challenges [PDF]

open access: yes, 2011
Commercial wetlands are defined as wetlands directed by an entrepreneur with the intention of making a profit. The combination of ecosystem services that commercial wetlands can provide seems to be an attractive societal perspective.
Blaeij, A.T., de   +2 more
core   +3 more sources

Land Degradation Changes the Role of Above- and Belowground Competition in Regulating Plant Biomass Allocation in an Alpine Meadow

open access: yesFrontiers in Plant Science, 2022
The allocation pattern of plant biomass presents the strategy of the plant community to adopt environmental changes, while the driver of biomass allocation is still unclear in degraded alpine grassland ecosystems.
Yong Zhang   +15 more
doaj   +1 more source

‘No Net Loss’ - Instrument Choice in Wetlands Protection [PDF]

open access: yes, 2006
While not a high priority issue for most people, the public has long recognized the general importance of wetlands. Since President George H.W. Bush\u27s campaign in 1988, successive administration have pledged to ensure there would be no net loss of ...
Ruhl, J.B., Salzman, James
core   +2 more sources

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