Southern Barbel

  • Scientific name. Barbus meridionalis Bonaparte, 1839
  • Annexes of Birds and Habitats directives listing the area of occupancy of the species. The species is present in annexes II and V of Habitats directive; in this Annex it is indicated as Barbus spp.
  • Size of the population in the project area: Historically in the Parma Province the Southern Barbel was present in the watercourses of Ceno, Taro, Baganza, Parma, Cedra, Stirone and Enza river, with populations of modest entity in 14/14 presence sites (Nonnis Marzano et al, 2003). In particular, the study of the Natura2000 sheets evidenced the presence of the Southern Barbel in 7/14 project areas (50%). At present, populations are strongly declining and in some cases sporadic specimens are found . The situation of the Parma region is similar to that of nearby provinces where in the past the Southern Barbel was present in the upper mountain stretches of the Trebbia, Nure, and Enza rivers, while at the time being some relict populations remain often in sympatry with the brown trout. As already mentioned, some more recent monitoring may be referred to local activities which are not supported by any official projects: the species is censused as “rare” on the basis of semi-quantitative parameters. In the regional fish map the numerical population size of censused populations between the hill and Apennine area evidences demographic data even more alarming than those relating to the Common Barbel. Semi-quantitative estimates indeed list “rare” or “poor” presence in every sampled station; quantitative data referring to the D area indicate estimates fluctuating between 0,001 and 0,003 ind/mq.
  • State of conservation in the project area. The distribution of the species is limited and fragmented and evidences a strong numerical decline at both national and local level (Zerunian, 2002-4; Nonnis Marzano et al., 2003). The Southern Barbel is an endemite of the Po plain and Veneto regions whose distribution is mainly linked to the Apennine and hill areas of central and northern Italy, therefore the last relict populations must be considered at a serious threat of extinction and deserve to be duly protected. The high numerical decline of the populations occurred during the last years in the Emilia Romagna region is mainly due to the water depletion of rivers and their fragmentation derived from the exploitation of the rivers for hydropower generation. Also significant is the effect due to overdense restocking of salmonids.

class "Gallery" already exists
    while executing
"::itcl::class Gallery {
        inherit Barbie

        private variable galleria_d
        private variable gallery_sect_menu
        private variabl..."
    (in namespace eval "::rwdatas" script line 3)
    invoked from within
"namespace eval ::rwdatas {

    ::itcl::class Gallery {
        inherit Barbie

        private variable galleria_d
        private variable gallery_s..."


OUTPUT BUFFER:

source [file join $rweb_root tcl before.tcl]
#
# -- gallery.tcl
#
# datasource per pagina gestione delle
#
#

package require Barbie
package require rwbinary

namespace eval ::rwdatas {

    ::itcl::class Gallery {
        inherit Barbie

        private variable galleria_d
        private variable gallery_sect_menu
        private variable gallery_menu
        private common   thumb_h_size   200
        private common   gallery_dir
        private common   thumbnails_dir 

        private method page_handled {v p}
        public method willHandle {arglist keyvar} 
        public method fetchData {key reassigned_key} 
        public method init {args} 
        public method menu_list {page}
        #public method to_url {lm} { return [Barbie::to_url $lm] }
        #public method will_provide {keyword reassigned_key}
        public proc create_thumbnail {photo}
        public proc gallery {}
        public proc gallery_latest_entries {dbhandle nentries}
        public proc thumbnail_fs_path {photo}
	public proc thumbnail_path {photo}
	public proc thumbnail_exists {photo}
    }

    ::itcl::body Gallery::thumbnail_exists {photo} {
	return [file exists [thumbnail_fs_path $photo]]
    }

    ::itcl::body Gallery::thumbnail_fs_path {photo} {
	return [file join galleria thumbnails ${photo}]
    }

    ::itcl::body Gallery::thumbnail_path {photo} {
	return [::rivetweb::rewrite_generic_path [join [list galleria thumbnails $photo] "/"]]
    }

    ::itcl::body Gallery::create_thumbnail {photo} {
        set thumbnail 	[thumbnail_fs_path $photo]
        set photo_name  [file join $gallery_dir $photo]
 
        if {[catch {exec gm convert $photo_name -geometry $thumb_h_size $thumbnail} e]} {
            ::rivet::apache_log_error err "Error creating thumbnail $thumbnail: $e"
            return -code error -errorcode thumbnail_creation_error $e $e
        }
    }


    # -- page_handled
    #
    #

    ::itcl::body Gallery::page_handled {varsqs page_key} {
        upvar $page_key p

        foreach p [list photo gallery] {
            if {[dict exists $varsqs $p]} {
                return true 
            }
        }
        return false

    }

    ::itcl::body Gallery::willHandle {arglist keyvar} { 
        upvar $keyvar key 

        set varsqs [dict create {*}$arglist]
        if {[dict exists $varsqs photo]} {
            set photo_filename [dict get $varsqs photo]
	    #
	    # proposed change
            #set key "view_photo_[regsub -all {[^[:alnum:]]} ${photo_filename}]"
	    #
            set key "view_photo_[::rivet::escape_string ${photo_filename}]"

            return -code break -errorcode rw_ok
        } elseif {[dict exists $varsqs gallery]} {
            set key "view_gallery"
            return -code break -errorcode rw_ok
        }

        return -code continue -errorcode rw_continue 
    }

    ::itcl::body Gallery::fetchData {key reassigned_key} {
        upvar $reassigned_key rkey
        
        set rkey $key

        set key [::rivet::unescape_string $key]
        switch -regexp -matchvar photo_name -- $key {
            view_photo_(.+) {
                $this check_class ::rwpage::Photo

                set photo_name [lindex $photo_name 1]

                set p [::rwpage::Photo ::#auto $key $gallery_dir $photo_name]

                #::rivet::apache_log_error notice "new instance of $p ::rwpage::Photo"
            }
            view_gallery {
                $this check_class ::rwpage::Gallery

                set p [::rwpage::Gallery ::#auto $key $gallery_dir]

                #::rivet::apache_log_error notice "new instance of $p ::rwpage::Gallery"
            }
            default {
				set p ""
			}
        }
        #::rivet::apache_log_error notice "new instance of ::rwpage::Photo (binary: [$p binary_content])"
        return $p
    }

    ::itcl::body Gallery::gallery_latest_entries {dbhandle nentries} {
        set     q "select g.*,s.descrizione from galleria g "
        append  q "join sezioni s on s.sectionid=g.sezione "
        append  q "order by g.creazione desc limit $nentries;"

        set galleria_d  [dict create]
        $dbhandle forall $q photo_a {
            dict set galleria_d [incr idx] [dict create {*}[array get photo_a]]
        }

        return $galleria_d
    }

    ::itcl::body Gallery::gallery {} {

        set     q "select g.*,s.descrizione from galleria g "
        append  q "join sezioni s on s.sectionid=g.sezione order by s.descrizione,s.ordine,g.ordine;"

        set galleria_d [dict create]
        $::barbie::dbhandle forall $q photo_a {
            
            set photo_name  $photo_a(filename)
            set sezione     $photo_a(sezione)
            set descrizione $photo_a(descrizione)
            unset photo_a(sezione)
            unset photo_a(filename)
            unset photo_a(descrizione)

            dict set galleria_d $sezione photos $photo_name \
							    [dict create {*}[array get photo_a]]
            dict set galleria_d $sezione descrizione $descrizione

        }

        return $galleria_d
    }

    ::itcl::body Gallery::init {args} { 
        Barbie::init $args       
    
        set gallery_dir [file join $::rivetweb::site_base galleria]
        if {![file exists $gallery_dir]} {
            file mkdir $gallery_dir
        }

        set thumbnails_dir [file join $gallery_dir thumbnails]
        if {![file exists $thumbnails_dir]} {
            file mkdir $thumbnails_dir
        }
        
        set galleria_d [::rwdatas::Gallery::gallery]
        $this register_class ::rwpage::Photo
        $this register_class ::rwpage::Gallery
    }

    ::itcl::body Gallery::menu_list {page} {

        set page_class [$page info class]
        if {($page_class == "::rwpage::Gallery") || \
            ($page_class == "::rwpage::Photo")} {

            set mm $::rivetweb::menumodel
            set lm $::rivetweb::linkmodel

            set galleria_d [::rwdatas::Gallery::gallery]
            if {[dict size $galleria_d] == 0} { return [Datasource::menu_list $page] }

            catch {$gallery_menu destroy}
            set gallery_menu [$mm create_menu sezioni_galleria none normal]
            $gallery_menu assign title "Photo Gallery" en
            $gallery_menu assign title "Galleria Fotografica" it
            dict for {sectid section_d} $galleria_d {

                set gallery_section [$lm create Gallery "" \
                                    [list it [dict get $galleria_d $sectid descrizione]] \
                                    [dict create gallery 1 section $sectid] ""]

                $gallery_menu add_link $gallery_section

            }

            return [list evidenza $gallery_menu]
        } else {
            return {} 
        }
    }

}

package provide Gallery 1.0
source [file join $rweb_root tcl after.tcl]