THE NATIONAL RED LIST OF NORTH MACEDONIA

Water Caltrop

Trapa natans

Macedonian

Водно оревче

Albanian

Arrë uji, Kacirom

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Not evaluated Data deficient Least concern Near threatened Vulnerable ENDANGERED Critically endangered Extinct in the wild Extinct
NE DD LC NT VU EN CR EW EX
Taxonomy
Assessment info
Population
Habitat and Ecology
Threats
Use and Trade
Conservation Actions
Bibliography

Taxonomy

Scientific name

Trapa natans

Authority

L.

Synonyms

Trapa astrachanica (Flerow) N.A.Winter; Trapa carinthiaca (Beck) V.N.Vassil.; Trapa colchica Albov; Trapa conocarpa (F.Aresch.) Flerow; Trapa cruciata (Glück) V.N.Vassil.; Trapa europaea Flerow; Trapa hungarica Opiz; Trapa maeotica Woronow; Trapa muzzanensis (Jäggi) Szafer; Trapa rossica V.N.Vassil.; Trapa septentrionalis V.N.Vassil.; Trapa spryginii V.N.Vassil.

Assessment info

IUCN Red List Category and Criteria

EN – Endangered, B1ab(i,ii,iii)+2ab(i,ii,iii)

Date assessed

November 2019

Assessors

Talevska, M.

Reviewers

Čarni, A.

Contributors

Matevski, V.

Cvetkoska, C.

Facilitators

Hofman, M.P.G.

Justification

Major threats for Trapa natans population in North Macedonia are changes of water levels in lakes, lot of mud (Prespa Lake, Dojran Lake) and melioration of wetlands. This leads to continuing declines in the area of occupancy, extent of occurrence and quality of habitat. The population is not connected with the populations in the neighboring countries.

According to the global assessment on the IUCN Red list, the species is Least Concern (LC), while in Balkan, Mediterranean and Europe it is classified as Data Deficient (DD).

Population

Current population trend

Unknown

Description

There are 5 sub-populations. During the last investigations 4 sub-populations are confirmed (Pretor – Lake Prespa, Skocivir – Crna River, and in Ohrid wetland), while for one (Monospitovo Swamp) additional research is needed.

Habitat and Ecology

System

Freshwater (=Inland waters)

Habitat and Ecology

Trapa natans is an annual floating-leaved rooted plant which grows best in shallow, nutrient-rich lakes and slow-moving rivers and streams. The plant is important as a food for aquatic animals and birds and as fish spawning habitat.

Use and trade

Use and trade

Trapa natans has long been consumed by humans across the world especially its nut-like fruit. The nuts have a high moisture content and are valued for quenching thirst as well as being used as a source of flour that forms the base for many different food products. The nuts’ composition consists of 15% protein, 7.5% fat, 52% starch, 3% sugar and 22.5% water (Hummel and Kiviat, 2004).

Threats

Threats

Major threats for Trapa natans population in North Macedonia are changes in water levels in lakes (Lake Prespa, Lake Dojran), rivers (Crna River-Skocivir) and melioration of wetlands (Monospitovo, Katlanovo, Ohrid Swamp – Studencishta).

Conservation actions

Conservation actions

The status of species Trapa natans in the Balkans needs to be clarified and more information is needed to make an assessment.

The species is included under Appendix I of the Convention on the Conservation of European Wildlife and Natural Habitats (Bern Convention).

The shoreline of the Ohrid Lake, where this species occurs, is declared as World Heritage Site by UNESCO. Areas of Prespa Lake (Ezerani) and Dojran Lake, where this species is presents, are Ramsar Sites. One of the species locality is Monospitovo – the largest wetland in North Macedonia which protection is priority.

Bibliography

Bibliography

IUCN. 2012. IUCN Red List Categories and Criteria: Version 3.1. Book. .p/.

Micevski K. 2001. Flora na Republika Makedonija. MANU. Skopje, 1(5): 1121-1430. .p 1121-1430.

Čado, I 1971 Some physiographic and hydrological characteristics of the coastal zones of Lake Ohrid and Lake Prespa . .p 1-86.

Micevski, B. 2003. Inventory of Macedonian wetlands (as natural resources) . Skopje.. .p 72.

Jakovlević S. 1934. Végétation macrophytique du lac de Prespa. .p 35-55.

Micevski, K. 1969. Vodna vegetacija na Ohridskoto i Prespanskoto Ezero. .p 61-80.

Hummel, M. and E. Kiviat. 2004. Review of World Literature on Water Chestnut with Implications for Management in North America . .p 17-28.