The Red osier dogwood (Cornus sericea L.) is a popular North American ornamental shrub, often planted also in Slovenia. Subspontaneous occurrence of the species in Slovenia is known for two decades, ...but only in recent years, we can recognize it as an invasive species. The Red osier dogwood is currently known from numerous localities in the wider city area of Ljubljana and also from two sites in the Gorenjska region. It occurs in wetland habitats, particularly in the vicinity of settlements, where the shrub is planted for ornamental purposes. To limit the invasion of the Red osier dogwood, timely measures should be taken. We also publish the updated determination key for the genus Cornus in Slovenia.
The floristic investigation of the Ionian island of Kalamos resulted in the addition of 275 specific and infraspecific taxa, which are reported here, to a present total of 502 taxa. For each newly ...recorded taxon local distribution and habitat types are presented. Convolvulus pentapetaloides and Malcolmia graeca subsp. hydraea are reported for the first time from the Ionian islands. Some of the new records concern rare taxa in Greece or regional endemics, which are, therefore, chorologically significant, such as Alkanna corcyrensis, Stachys ionica, Heptaptera colladonioides. A brief description of some of the vegetation types of the island is given. The results of floristic analysis and phytogeographical aspects demonstrate the pronounced Mediterranean character of the island’s flora.
Na otoku Kalamos smo s floristično raziskavo odkrili 275 novih taksonov na nivoju vrste in nižje ob do sedaj že poznanih 502 taksonih. Za vsak novo odkrit takson predstavljamo lokalno razširjenost in habitatni tip. Taksona Convolvulus pentapetaloides in Malcolmia graeca subsp. hydraea smo na ionskih otokih našli prvič. Nekatere nove najdbe so redki taksoni ali lokalni endemiti, kot so Alkanna corcyrensis, Stachys ionica, Heptaptera colladonioides in so horološko pomembni. Podali smo tudi kratek opis nekaterih vegetacijskih tipov otoka. Rezultati floristične analize in fitogeografskih vidikov kažejo izrazito mediteranski značaj preučevanega rastlinstva.
Abstract
This treatise investigates the poorly studied bird fauna of Mitidja Plain (Northern Algeria), with particular notes on the occurrence and expansion of new and alien species. Direct ...observations, supported by ornithological surveys carried out by Progressive Frequential Sampling (PFS), a version of a point count method, have allowed us to identify 125 bird species. These represent 31% of all species known from Algeria. The species recorded belong to 14 orders, 39 families and 37 genera. According to their biogeographic origins, 36 are Mediterranean, 32 Palearctic, 24 Holarctic, 17 European and 16 of European-Turkestani origin. The Mitidja Plain holds 60 resident-breeder species (48% of all registered species) and is a transit zone for many migratory species (summer and winter migrants constituting 20% and 14% of the total, respectively) and occasional visitors (RA = 12%). Among recently expanding species (introduced or local), the Collared Dove Streptopelia decaocto and Wood Pigeon Columba palumbus, sampled by the spot-mapping method, experienced a very rapid population growth. The first observations of the former were made in 1996 in Algiers. Its numbers experienced a steep increase after 2002, starting from 5.75 pairs/10 ha to reach up to 31.5 pairs/10 ha in 2006. The same applies for the Rose-ringed Parakeet Psittacula krameri, surveyed by direct-count at roosting sites. This species has been able to increase and reproduce since its first introduction into the wild in 1996. The increase in study species populations, especially the Rose-ringed Parakeet, may derive from good weather conditions that favoured the species through providing better feeding conditions, thus high reproduction outcomes.
Based on research of ruderal vegetation in the Horná Orava region in the 1980s and in 2005-2007, a list of neophytes was compiled. Thirty-three species of neophytes have been found, representing 6% ...of the overall flora. The geographical origin, family, life-history, life-form and status of invasion of these species were assessed. The biggest proportion of the species was of North American origin (49%), therophytes (49%) and members of the family Asteraceae (38%). Most of the neophytes are garden "escapees" and only few of them may be considered to be of potential hazard to the studied region, most particularly Fallopia japonica, Impatiens glandulifera and Solidago canadensis. Types of plant communities, where particular neophytes were found, and the foci of their distribution were evaluated as well. Neophytes are most abundant in communities of the class Galio-Urticetea, and especially of the alliance Senecionion fluviatilis. Comparing older and present data, trends in the progression of non-indigenous species in the Horná Orava region were predicted. It is apparent that the number of localities of invasive species is increasing and even other species that in the literature from the other regions are mentioned as invasive tend to spread through the area.
Na podlagi raziskav ruderalne vegetacije območja Horná Orava v osemdesetih letih prejšnjega stoletja in med letoma 2005 in 2007 smo sestavili seznam neofitskih vrst. Ugotovili smo triintrideset neofitov, ki pomenijo šest odstotkov celotne flore območja. Prikazali smo zemljepisni izvor, taksonomsko pripadnost, življenjsko dobo in obliko rastlin in status invazivnosti. Največji delež vrst je severnoameriškega izvora (49 odstotkov), so terofiti (49 odstotkov) in jih uvrščamo v družino Asteraceae (38 odstotkov). Večina neofitov je "ubežnikov" z vrtov in le nekaj jih je potencialno nevarnih za obravano območje, to so predvsem vrste Fallopia japonica, Impatiens glandulifera in Solidago canadensis. Ovrednotili smo tudi rastlinske združbe, v katerih se neofiti pojavljajo, in žarišča njihovega razširjanja. Neofiti so najbolj pogosti v združbah razreda Galio-Urticetea in še posebej zveze Senecionion fluviatilis. S primerjavo starejših in sedanjih podatkov smo napovedali trende v razširjanju tujerodnih rastlinskih vrst na območju Horná Orava. Število rastišč z invazivnimi vrstami se je očitno povečalo, prav tako smo opazili razširjanje vrst, omenjenih v literaturi kot invazivne z drugih območj.
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