Annex IV protected areas: water dependent habitats and species and high status sites




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Table 5.2. Relative sensitivity of Habitats Directive Annex I water-dependent habitats: critical loads for Nitrogen (see note in Comments column).

HD Habitat Code

Habitat Name


Critical loads

For Nitrogen

Kg N ha-1 yr-1


Comments

1110

Sandbanks which are slightly covered by sea water all the time




Note: Critical loads for nitrogen are taken from, and adapted from, Table 10.1 of Empirical nitrogen critical loads for natural and semi-natural ecosystems: 2002 update (Roland Bobbink, Mike Ashmore, Sabine Braun, Walter Flückiger and Isabel J.J. Van den Wyngaert. This is the backing document for critical nitrogen loadings under the Gothenberg Protocol, and as such relates to N deposition from air emissions, and may not be applicable for the purposes of the Water Framework Directive. It is recognised that nitrogen loadings to ecosystems are derived through a number of pathways, including air-borne (e.g. air emissions, aerial application of fertiliser and slurry spreading), water-borne (surface and ground), and past and present land use and management. The ecological effects of these loadings are mediated through variations in acid neutralising capacity, soil nutrient availability, and soil factors including wetness, which influence the nitrification potential, nitrogen immobilisation and denitrification rates. The critical loads therefore are suggested as an interim standard for nitrogen loadings from all pathways, which will require on-going review in the light of establishment of baseline information and monitoring trends.
## reliable

# quite reliable

(#) expert judgement

? possible indicative range


a) use towards high end of range at phosphorus limitation, and towards lower end if phosphorus is not limiting

b) use towards high end of range where sod cutting has been practiced, use towards lower end of range with low intensity management

c) use towards high end of range with high precipitation and towards low end of range with low precipitation

d) use lower end of range for transition fens and quaking mires, use higher end of range for valley mires



e) for high latitude or N-limited systems, use lower end of range


1130

Estuaries




1140

Mudflats and sandflats not covered by seawater at low tide




1150

Coastal lagoons

?

1160

Large shallow inlets and bays




1170

Reefs




1210

Annual vegetation of drift lines




1220

Perennial vegetation of stony banks




1230

Vegetated sea cliffs of the Atlantic and Baltic coasts




1310

Salicornia and other annuals colonizing mud and sand




1320

Spartina swards (Spartinion maritimae)




1330

Atlantic salt meadows (Glauco-Puccinellietalia maritimae)

30-40 (#)

1410

Mediterranean salt meadows (Juncetalia maritimi)




1420

Mediterranean and thermo-Atlantic halophilous scrubs (Sarcocornetea fruticosi)




2110

Embryonic shifting dunes

10-20 (#)

2120

Shifting dunes along the shoreline with Ammophila arenaria (white dunes)

10-20 (#)

2130

Fixed coastal dunes with herbaceous vegetation (grey dunes)

10-20 #

2140

Decalcified fixed dunes with Empetrum nigrum

10-20 #

2150

Atlantic decalcified fixed dunes (Calluno-Ulicetea)

10-20 (#)

2170

Dunes with Salix repens ssp. argentea (Salix arenariae)

10-25 (#)

2190

Humid dune slacks

10-25 (#)

21A0

Machairs (* in Ireland)

10-20 (#)?

3110

Oligotrophic waters containing very few minerals of sandy plains (Littorelletalia uniflorae)

5-10 ##

3130

Oligotrophic to mesotrophic standing waters with vegetation of the Littorelletea uniflorae and/or of the Isoëto-Nanojuncetea

5-10 ##

3140

Hard oligo-mesotrophic waters with benthic vegetation of Chara spp.




3150

Natural eutrophic lakes with Magnopotamion or Hydrocharition-type vegetation

15-35?

3160

Natural dystrophic lakes and ponds

5-10##

3180

Turloughs

5-35?

3260

Water courses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachion vegetation

?

3270

Rivers with muddy banks with Chenopodion rubri p.p. and Bidention p.p. vegetation

?

4010

Northern Atlantic wet heaths with Erica tetralix

10-25a,b (#)

Critical load for nitrogen applies to wet heath habitat, value for flushes likely to be in range of 5-10 Kg N ha-1 yr-1

6410

Molinia meadows on calcareous, peaty or clayey-silt-laden soils (Molinion caeruleae)

15-25 (#)




6430

Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels

?




7110

Active raised bogs

5-10 a,c ##




7120

Degraded raised bogs still capable of natural regeneration

5-10 a,c ##




7130

Blanket bog (*active only)

5-10 a,c ##




7140

Transition mires and quaking bogs

10-20 d (#)




7150

Depressions on peat substrates of the Rhynchosporion

5-10 a,c ##




7210

Calcareous fens with Cladium mariscus and species of the Caricion davallianae

15-35 e(#)




7220

Petrifying springs with tufa formation (Cratoneurion)

15-35?




7230

Alkaline fens

15-35 e (#)




8310

Caves not open to the public







8330

Submerged or partly submerged sea caves







91D0

Bog woodland

5-10 a,c ##




91E0

Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae)

?




Table 5.3 Water status sensitivity of Irish water dependent Habitats Directive Annex II listed species.

The sensitivity of species refers to existing pressures as well to developments that may be considered in the future. Sensitivity is listed as low, medium, high or very high. “Direct Impacts” include on-going activities and construction phase impacts. “Hydrological Impacts” and “Water Pollution” similarly refer to on-going activities, and operational phase impacts of developments which may be considered in the future. The surface water dependent, groundwater dependent and marine water dependent columns indicate the water sources which are likely to be relevant to different water dependent habitats; the status of one or all of these water sources may be relevant to existing and proposed cumulative pressures. Note that Appropriate Assessments are required for any plans of projects potentially impacting on Natura 2000 sites, in consultation with NPWS.



HD Species Code

Species name

Common name

Surface Water Dependent

Groundwater Dependent

Marine Water Dependent

Sensitivity to Direct Impacts

Sensitivity to Hydrological Impacts

Sensitivity to Water Pollution13


Comments

1013

Vertigo geyeri

whorl snail




Yes




High

High

High

Habitat adversely affected by nutrient inputs, snail highly vulnerable to pesticides

1014

Vertigo angustior

whorl snail




Yes




High

High

High

Habitat adversely affected by nutrient inputs, snail highly vulnerable to pesticides

1016

Vertigo moulinsiana

whorl snail

Yes

Yes




High

High

High

Habitat adversely affected by nutrient inputs, snail highly vulnerable to pesticides

1029

Margaritifera margaritifera

freshwater pearl mussel

Yes







Very High

High

Very High

Silt loading to watercourses arising from land-use pressures and construction activity needs to be strictly controlled. Refer to legislation

1065

Euphydryas aurinia

marsh fritillary










High










1092

Austropotamobius pallipes

white-clawed crayfish

Yes

Yes




High

Medium to High

Medium-high

Brooding females vulnerable to disturbance and channel works; seasonal constraints on channel works through winter and spring. Most populations in waters with Q value >3, vulnerable to certain pesticides and certain organic compounds, and sewage discharges. Risk of alien crayfish species introduction, and other sources of crayfish fungal plague

1095

Petromyzon marinus

sea lamprey

Yes




Yes

High

High

Medium?

River channel margin silt beds used as spawning and nursery areas for extended larval stage. Seasonal constraints apply with no dredging in March and April, and retention undisturbed of marginal silt beds. OPW and Waterways Ireland protocols apply, with any animals in dredged material returned alive to the water

1096

Lampetra planeri

brook lamprey

Yes







High

High

Medium?

1099

Lampetra fluviatilis

river lamprey

Yes







High

High

Medium?

1102

Alosa alosa

allis shad

Yes




Yes

Low to Medium?

High

Medium?

Shad species, spawning areas and requirements poorly known. Barriers to passage (i.e. weirs) considered problematic. Apparently insufficient information for application of measures

1103

Alosa fallax

twaite shad

Yes




Yes

Low to Medium?

High

Medium?

1106

Salmo salar

Atlantic salmon

Yes




Yes

High

High

High

Spawning beds and fry very vulnerable to siltation. Seasonal constraints on channel works legally required, with no dredging between 1st October and 30th April.

1349

Tursiops truncatus

bottle-nosed dolphin







Yes













1351

Phocoena phocoena

harbour porpoise







Yes













1355

Lutra lutra

otter

Yes




Yes

Medium

Medium

Medium

Removal of riparian vegetation cover adverse

1364

Halichoerus grypus

grey seal







Yes













1365

Phoca vitulina

common seal







Yes













1393

Drepanocladus vernicosus

shining sickle moss




Yes




High

High

High




1395

Petalophyllum ralfsii

petalwort




Yes




High

High

High




1421

Trichomanes speciosum

Killarney fern

Yes







High

High

Medium




1528

Saxifraga hirculus

yellow marsh saxifrage




Yes




High

High

Medium




1833

Najas flexilis

slender naiad

Yes







Low

High

High




1990

Margaritifera durrovensis

Nore pearl mussel

Yes







Very High

High

Very High

Silt loading to watercourses arising from land-use pressures and construction activity needs to be strictly controlled. Refer to legislation


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