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THEME 3. Threats to biodiversity in a changing climate

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THEME 3. Threats to biodiversity in a changing climate

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Possible signs of climate change in your BioArea, such as weather extremes.
Although in recent years I have noticed an increase of the average annual temperatures, milder winters, warmer summers and fewer precipitations, there have been no extreme weather phenomena.

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THEME 3. Threats to biodiversity in a changing climate

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THEME 3. Threats to biodiversity in a changing climate

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Possible invasions of alien species in your BioArea during the last decade. Consult also the list of 100 World’s Worst Invasive Alien Species.
One of alien species in my BioArea is Trachemys scripta elegans, semiaquatic turtle which is bought to be held as a pet. The problem is that when is it bought, it have like 5 centimeters in diameter and to the maturity it incrises quite large. That is the moment when people throw them away, in nature. They have aggressive behavior and are competing with our native turtle Emys orbicularis.

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THEME 3. Threats to biodiversity in a changing climate

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THEME 3. Threats to biodiversity in a changing climate

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Species of your BioArea that appear on the IUCN Red List of Threatened Species.
1. Centaurea jankae- vulnerable;
2. Lutra lutra- near threatened;
3. Emys orbicularis- near threatened;
4. Triturus dobrogicus- near threatened;
5. Cerambyx cerdo- vulnerable;

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THEME 3. Threats to biodiversity in a changing climate

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THEME 3. Threats to biodiversity in a changing climate

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Wildlife overexploitation in your BioArea for the food industry, pet market, traditional medicine or the fashion industry.
In my BioArea the fish population are overexploited, but indirectly and in a form that people may not percive. The fish population are decreasing and people can think that is the fault of the fisherman, but if you count them, there are too few left to affect fish populations. There is a period in which spring when fish lay their eggs and fishing is prohibited. The problem is tourism that begins during this period and motor boats stir the water so hard that it removes the eggs from the substrate so the fecundation does not happen anymore and the fish populations are extremly affected.

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THEME 3. Threats to biodiversity in a changing climate

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THEME 3. Threats to biodiversity in a changing climate

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Habitat loss, habitat fragmentation or habitat degradation in your BioArea. Discuss with scientists, or look online for potential consequences to the local plant and animal populations.

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Based on the simplified trophic pyramid found in slide 6 of the resource topic 2.1 'Relationship of organisms in ecosystems', make an analogous one with plants and animals from your own BioArea.

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Two organisms that share the same food (niche partitioning) and the way that they manage it in my BioArea:

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The ecological niche of two characteristic animals in my BioArea

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Two parasitic organisms in my BioArea:
1. Eustrongylides excisus on Sander lucioperca;
2. Cammallanus on Cyprinus carpio.

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Two examples of animals with a predator-prey relation in my BioArea:
1. Haliaeetus albicilla and Spermophilus;
2. Mustela erminea and Lepus europaeus.

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In Danube Delta are present two species of pelicans: Pelecanus onocrotalus ( Great White Pelican) and Pelecanus crispus ( Dalmatian pelican) which form important colonies.

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Cormorants are from the same order with pelicans: Pelecaniformes. Thus, they live in colonies. In Danube Delta we can find three species of cormorants: Phalacrocorax carbo (Great cormorant) , Phalacrocorax pygmaeus (Pygmy cormorant) and  Phalacrocorax aristotelis (European shag).

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Danube Delta is located in Tulcea County, South East of Romania at the joining of the Danube with the Black Sea. It`s a wetland that provide a perfect home for so many species of plant and animals. That means it`s a natural genetic bank with priceless importance for biodiversity.
References: http://www.ddbra.ro/en/danube-delta-biosphere-reserve/danube-delta

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3.     The wolves were brought in because the increased elk population was overgrazing the deciduous, woody species such as aspen and cottonwood.