New Record of Red Alga Thorea Hispida (Thore) Desvaux (Rhodophyta) in the River Sava (Sremska Mitrovica, Serbia)

Snežana B. Simić1, Nevena B. Đorđević1 and Božica M. Vasiljević2

 

 

 

 

1 University of Kragujevac, Institute of Biology and Ecology, Faculty of Science, 12 Radoja Domanovića, 34000 Kragujevac, Serbia

2 University of Belgrade, Institute for Biological Research "Siniša Stanković", 142 Despota Stefana Blvd., 11000 Belgrade, Serbia

 

 

 

 

Abstract

Thorea hispida (Thore) Desvaux (as T. ramosissima Bory de Saint - Vincent) was first found in Serbia in the river Danube at the end of the 19th century. Further, T. hispida was reported for the Beli Timok (1996 and 2005) and the Sava (near the town of Šabac, 2008 ). On the territory of Serbia T. hispida is also rarely found with a low population density. This paper presents the new data on the distribution of T. hispida, discusses the ecology and morphological characters of this species and provides the comparison of morphological characters of the thalii between different sampling sites. Possible factors of endangerment of T. hispida are briefly discussed.

Keywords: Thorea, threatened algae, Sava, Croatia, Serbia

 

 

Introduction

 

Distribution data on Thorea Bory de Saint-Vincent in Europe indicate that this genus was found in many countries, but in a relatively small number of localities (Kwadrans and Eloranta, 2010). Thorea hispida (Thore) Desvaux (as T. ramosissima Bory de Saint-Vincent) is incorporated in the Red List of threatened algae in some European countries: Poland – extinct species (EX) (Sieminska, 2006), Slovakia and Bulgaria – critically endangered species (CR) (Marhold and Hindak, 1998; Temniskova et al., 2008), Germany – vulnerable (VU) (Ludwig and Schnittler, 1996), Ukraine – rare species whose populations are small, which currently does not include categorization as "endangered" or "vulnerable", although it is in danger (III) (Шеляг-Сосонко, 1996), Lithuania – rare species, but it still does not include categorization (Vitonytė, 2011).

On the territory of the Serbia T. hispida is also rarely found with low population density. The first data on occurrence of this species dates from the end of the 19th Century, when Magnus (1889) reported it for the Danube. Further, T. hispida was reported for the Beli Timok (Simić and Ranković, 1998; Simić and Pantović, 2010) and the Sava (near the town of Šabac – Simić and Pantović, 2010).

T. hispida was assessed as critically endangered (CR) in Serbia based on low frequency of occurrence, low population density and factors of localities endangerment on both localities (gravel exploitation and possible utter destruction of this species' habitat) (Simić et al., 2007; Simić and Pantović, 2010).

This paper presents the new data on the distribution of T. hispida, discusses the ecology and morphological characters of this species and provides the comparison of morphological characters of the thalii between different sampling sites. Possible factors of endangerment of T. hispida are briefly discussed, as well.