Ecology Summary - Hannia greenwayi

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Main Ref.	Allen, G.R., S.H. Midgley and M. Allen, 2002
Remarks	Inhabits moderately to swiftly flowing streams in clear or turbid water over mixed sand and rocky bottoms (Ref. 44894). Not much known on the biology of this species, although a single collection of 100 specimens taken in 1969 indicate that they occur in fast flowing rapids; the water being green-colored with visibility reduced to 30 cm (Ref. 5259). Adult occasionally exhibit the 'blubber lip' condition seen in members of the closely related genus Hephaestus. Omnivorous, feeds on algae and small invertebrates. When freshly captured, a distinctive pattern of broad vertical bars is displayed on sides. This is an indication of stress (Ref. 44894).

Main Ref.

Allen, G.R., S.H. Midgley and M. Allen, 2002

Remarks

Inhabits moderately to swiftly flowing streams in clear or turbid water over mixed sand and rocky bottoms (Ref. 44894). Not much known on the biology of this species, although a single collection of 100 specimens taken in 1969 indicate that they occur in fast flowing rapids; the water being green-colored with visibility reduced to 30 cm (Ref. 5259). Adult occasionally exhibit the 'blubber lip' condition seen in members of the closely related genus Hephaestus. Omnivorous, feeds on algae and small invertebrates. When freshly captured, a distinctive pattern of broad vertical bars is displayed on sides. This is an indication of stress (Ref. 44894).

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 Hannia greenwayi may be found.

Habitat

Substrate	: sand;: rocky;
Substrate Ref.	Allen, G.R., S.H. Midgley and M. Allen, 2002
Special habitats
Special habitats Ref.

Associations

Ref.
Associations
Associated with
Association remarks
Parasitism

Feeding

Feeding type	plants/detritus+animals (troph. 2.2-2.79)
Feeding type Ref.	Allen, G.R., S.H. Midgley and M. Allen, 2002
Feeding habit	variable
Feeding habit Ref.	Allen, G.R., S.H. Midgley and M. Allen, 2002

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	2.72	0.24			Trophic level estimated from a number of food items using a randomized resampling routine.
Ref.

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