Ecology Summary - Hyphessobrycon myrmex

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Main Ref.	Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017
Remarks	Found where water is transparent and the river bottom is composed of stones, sand and a moderate amount of vegetal debris. The type locality which is a hydroelectric reservoir (PCH Divisa) built in 2010 in the Rio Formiga, occupy an area of 6·8 km2. Before the dam was built, this place would have resembled the adjacent up and downstream areas of the river, i.e. a relative narrow (10-15 m wide) and shallow (maximum depth approximately 1·8 m in some sites) river stretch, with rapid waters and rifles. Stomach contents revealed a diet based on filamentous algae (c. 10%), vascular plant tissue (c. 6%), microcrustaceans (c. 10%), Chironomidae larvae (c. 10%) and Ephemeroptera nymphs (c. 64%). It may be considered an omnivorous species based on the main food resources exploited, but may have tendency toward invertivory (Ref. 128641).

Main Ref.

Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017

Remarks

Found where water is transparent and the river bottom is composed of stones, sand and a moderate amount of vegetal debris. The type locality which is a hydroelectric reservoir (PCH Divisa) built in 2010 in the Rio Formiga, occupy an area of 6·8 km2. Before the dam was built, this place would have resembled the adjacent up and downstream areas of the river, i.e. a relative narrow (10-15 m wide) and shallow (maximum depth approximately 1·8 m in some sites) river stretch, with rapid waters and rifles. Stomach contents revealed a diet based on filamentous algae (c. 10%), vascular plant tissue (c. 6%), microcrustaceans (c. 10%), Chironomidae larvae (c. 10%) and Ephemeroptera nymphs (c. 64%). It may be considered an omnivorous species based on the main food resources exploited, but may have tendency toward invertivory (Ref. 128641).

Aquatic zones / Water bodies

	Marine - Neritic	Marine - Oceanic	Brackishwater	Freshwater
Marine zones / Brackish and freshwater bodies	supra-littoral zone littoral zone sublittoral zone	epipelagic mesopelagic epipelagic abyssopelagic hadopelagic	estuaries/lagoons/brackish seas mangroves marshes/swamps	rivers/streams lakes/ponds caves exclusively in caves

Highighted items on the list are where Hyphessobrycon myrmex may be found.

Habitat

Substrate	: sand; (, organic );: rubble;
Substrate Ref.	Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017
Special habitats
Special habitats Ref.

Associations

Ref.	Pastana, M.N.L. and F.C.P., Esguicero, A.L.H. Dagosta, 2017
Associations	parasitism;
Associated with	Cymothoidae.
Association remarks
Parasitism	inside host (Found in the tongue.)

Feeding

Feeding type	plants/detritus+animals (troph. 2.2-2.79)
Feeding type Ref.
Feeding habit
Feeding habit Ref.

Trophic Level(s)

Estimation method	Original sample		Unfished population		Remark
Estimation method	Troph	s.e.	Troph	s.e.	Remark
From diet composition
From individual food items	3.03	0.23			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.

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