Projected distribution of all confirmed UCDs and GCs in the Fornax cluster (see text; spectroscopy and photometry compiled from Kissler-Patig et al. 1999; Drinkwater et al. 2000; Dirsch et al. 2003; Mieske et al. 2004; Bassino et al. 2006a; Bergond et al. 2007; Firth et al. 2007, 2008; Jordán et al. 2007; Schuberth et al. 2010; Gregg et al. 2009; Puzia et al. 2011, priv. comm.). Small black dots are GCs (M_V >  −10.25 mag; about 400 sources). Filled black circles are UCDs (M_V <  −10.25 mag; about 180 sources). Filled red circles are “bright” UCDs with M_V <  −11 mag, about 45 sources. Large magenta asterisks indicate Fornax cluster giant galaxies from the FCC, defined as having M_V <  −18.5 mag. Magenta open circles indicate dwarf galaxies from the FCC with  −18.5 < M_V <  −14 mag, the postulated approximate magnitude range of UCD progenitor galaxies (Bekki et al. 2003). The inner solid circle indicates a radius of 50 kpc adopted in Fig. 2 for the comparison between the Fornax, Hydra, and Centaurus environments. As can be seen, the area coverage of the available Fornax spectroscopic surveys drops strongly beyond 50 kpc radius.