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Pelicans  and cormorants
(Pelecanus crispus vs. Phalacrocorax carbo).
It is impressive that these two species actually co-operate in order to find their food. Since pelicans cannot dive in order to find fish, the cormorants who are excellent divers bring to the surface of the water fish which end up in the big mouth of pelicans.
http://www.nath.gr/limnes/index.files/Page965.htm

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Brown bear vs. Black bear: different habitats that provide different foods

Brown bears tend to be larger than black bears.  Brown bears prefer  an open or semi open habitat, at least for foraging. They tend to seek their food at night with peak foreaging in early morning or early in the evening hours. They are not terretorial. They are omnivorous, with most of the diet consisting of plants and fungi. They eat insects, larvae, carrion, honey , and they also like to turn over rocks in order to find invertebrates such as earthworms. Brown bears also like bird eggs, fish, which they usually take during the salmon runs. They also prey on mammals, prefering the young or ill ones to the mature adults.

Black bears live in forests in wooded habitats with understory. They are mostly nocturnal and they are very territorial. They feed on the same food as the brown bear, but they also have direct access to masts since they are terretorial species. They also prey on deer fawn.
They carry seeds of berries in long distances (in their digestive systems) and expel them allowing seeds to grow.

Both species are fed on by blood-feeding insects and parasites.

https://www.quora.com/How-are-the-ecological-niches-of-black-bears-and-brown-bears-different-Why-is-the-competition-for-resources-among-theses-species-apparently-not-big-enough-to-have-one-species-push-the-other-out-of-a-shared-habitat

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Orobanche: Its name is of ancient greek origin: Οροβάγχη= όροβος (vetch) +άγχω (strangle, choke).
Because of the lack of chlorophyll, this plant species can only survive parasiting on other plants in order to ensure the necessary nutrients.  It often parasites a single plant species, such as ivy broomrape.
https://en.wikipedia.org/wiki/Orobanche

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Pleurotus ostreatus: common mushroom species. It is found on the  trunks of healthy or cut trees, especially on fir trees or deciduous trees.

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Relationships of Organisms in Ecosystems 

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Relationships of Organisms in Ecosystems 

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   Come up with possible reasons for the decision to reintroduce grey wolves into the National Park. From the three options below, select the reason you find most likely.1.     The wolves were brought into the National Park because people, thanks to the extensive awareness campaign, were not afraid of them anymore.2.     The wolves were brought in because they were the most exciting creatures for the visitors of the Park to see.3.     The wolves were brought in because the increased elk population was overgrazing the deciduous, woody species such as aspen and cottonwood.

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   Come up with possible reasons for the decision to reintroduce grey wolves into the National Park. From the three options below, select the reason you find most likely.1.     The wolves were brought into the National Park because people, thanks to the extensive awareness campaign, were not afraid of them anymore.2.     The wolves were brought in because they were the most exciting creatures for the visitors of the Park to see.3.     The wolves were brought in because the increased elk population was overgrazing the deciduous, woody species such as aspen and cottonwood.

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The correct answer is #3.

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Phalacrocorax pygmaaeus: 15 fish species have been recorded as its food. The most significant fish species that function as its prey are  Perca fluviatilis (18,8%), Rutilus rutilus (14,8%), Cyprinus carpio (10,8%), Cobitis taenia (9,7%) and Esox lucius (5,6%).
https://el.wikipedia.org/wiki/%CE%9B%CE%B1%CE%B3%CE%B3%CF%8C%CE%BD%CE%B1

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Perca fluviatilis

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Pelecanus  crispus- Flathead Mullet (Striped Mullet), Mugil cephalus

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Pelecanus  crispus- Flathead Mullet (Striped Mullet), Mugil cephalus

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Phalacrocorax pygmaaeus - Perca fluviatilis

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Pelecanus  crispus: it's a bird who feeds on fish, but does not compete in any case with the fisher men, because its food mainly consists of fish found in abundance and are of unsignificant commercial value. It also feeds on sick or dead fish which it can  pursue very easily. Its prey also consists of eels, mullets, shrimps, worms, catfish, and other small fish.
https://blogs.sch.gr/animals/2015/06/06/%CE%B1%CF%81%CE%B3%CF%85%CF%81%CE%BF%CF%80%CE%B5%CE%BB%CE%B5%CE%BA%CE%B1%CE%BD%CE%BF%CF%83/