Ågestasjön is a small lake

Lake

A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the ocean and therefore are distinct from lagoons, and are larger and deeper than ponds. Lakes can be contrasted with rivers or streams,...

 in Huddinge Municipality

Huddinge Municipality

Huddinge Municipality is a municipality in Stockholm County in east central Sweden. Its seat is located in Huddinge, which is a part of Stockholm urban area.The municipality is the second most populated in Stockholm County....

 south of Stockholm

Stockholm

Stockholm is the capital and the largest city of Sweden and constitutes the most populated urban area in Scandinavia. Stockholm is the most populous city in Sweden, with a population of 851,155 in the municipality , 1.37 million in the urban area , and around 2.1 million in the metropolitan area...

, Sweden

Sweden

Sweden , officially the Kingdom of Sweden , is a Nordic country on the Scandinavian Peninsula in Northern Europe. Sweden borders with Norway and Finland and is connected to Denmark by a bridge-tunnel across the Öresund....

.

Ågestasjön forms part of the Tyresån Lake System

Tyresån Lake System

Tyresån Lake System is a number of lakes in Sweden with a common basin of 251.5 km2....

 and, with a biodiversity

Biodiversity

Biodiversity is the degree of variation of life forms within a given ecosystem, biome, or an entire planet. Biodiversity is a measure of the health of ecosystems. Biodiversity is in part a function of climate. In terrestrial habitats, tropical regions are typically rich whereas polar regions...

 unique in the Stockholm region, is highly popular among birdwatchers

Birdwatching

Birdwatching or birding is the observation of birds as a recreational activity. It can be done with the naked eye, through a visual enhancement device like binoculars and telescopes, or by listening for bird sounds. Birding often involves a significant auditory component, as many bird species are...

 and ornithologists

Ornithology

Ornithology is a branch of zoology that concerns the study of birds. Several aspects of ornithology differ from related disciplines, due partly to the high visibility and the aesthetic appeal of birds...

. The lake also forms part of the Orlången Nature Reserve

Orlången Nature Reserve

Orlången Nature Reserve is a nature reserve surrounding Lake Orlången in central Huddinge Municipality, south of Stockholm, Sweden.There are four lakes within the reserve: Trehörningen , Ågestasjön, Orlången, and Mörtsjön....

 and one of the green wedges stretching into central Stockholm.

The lakes receives water from Lake Trehörningen

Trehörningen (Sjödalen)

Trehörningen is a small lake located in the municipality Huddinge in southern Stockholm, Sweden. As part of the Tyresån lake system, Trehörningen receives water from Lake Gömmaren and supplies water to Lake Ågesta.- History :...

 and in its northern end empties into Magelungen. For a brief history of the area see Trehörningen

Trehörningen (Sjödalen)

Trehörningen is a small lake located in the municipality Huddinge in southern Stockholm, Sweden. As part of the Tyresån lake system, Trehörningen receives water from Lake Gömmaren and supplies water to Lake Ågesta.- History :...

.

Catchment area

The lake and the wetlands around it was transformed into a bird protection area

Protected area

Protected areas are locations which receive protection because of their recognised natural, ecological and/or cultural values. There are several kinds of protected areas, which vary by level of protection depending on the enabling laws of each country or the regulations of the international...

 in 1976, which means the area is inaccessible to the public from April 15 to July 15 and hunting, hunting equipment, and dogs are prohibited all seasons. Most of the area within a radius of 300 metres from the lake is subject to special restrictions.

Except for birdwatchers, the lake and its surrounding also attracts open-air lovers who use the area for walking, tour skating

Tour skating

Tour skating is a sport and recreational form oflong distance ice skating on natural ice.The Nordic style of tour skating is popular in the Nordic countries,especially Sweden, but increasingly in...

, and cross-country skiing

Cross-country skiing

Cross-country skiing is a winter sport in which participants propel themselves across snow-covered terrain using skis and poles...

. Due to the restrictions on visiting the lake in summer, and to the considerable amount of aquatic plants, bathing is not possible in the lake. Additionally, motorboats and fishing are not allowed on the lake.

The lake is surrounded by agricultural lands and a variety of forests, including precious deciduous

Deciduous

Deciduous means "falling off at maturity" or "tending to fall off", and is typically used in reference to trees or shrubs that lose their leaves seasonally, and to the shedding of other plant structures such as petals after flowering or fruit when ripe...

 forest. Near the lake is a golf course

Golf course

A golf course comprises a series of holes, each consisting of a teeing ground, fairway, rough and other hazards, and a green with a flagstick and cup, all designed for the game of golf. A standard round of golf consists of playing 18 holes, thus most golf courses have this number of holes...

 and a riding school. Part of the biodiversity in the area is due to the bait animals kept around the lake.

Environmental impact

Ågestasjön receives nutrients and contaminants from both lakes upstream, the Orlången

Orlången

Orlången is a lake in central Huddinge Municipality, just south of Stockholm, Sweden.Orlången, one of the lakes in the Tyresån Lake System, forms part of the Orlången Nature Reserve.- Catchment area :...

 and Trehörningen

Trehörningen (Sjödalen)

Trehörningen is a small lake located in the municipality Huddinge in southern Stockholm, Sweden. As part of the Tyresån lake system, Trehörningen receives water from Lake Gömmaren and supplies water to Lake Ågesta.- History :...

, and Ågestasjön's proper catchment area which is rich in nutrients. In the northern end of the lake superficial sediments (0–2 cm) contain high levels of copper

Copper

Copper is a chemical element with the symbol Cu and atomic number 29. It is a ductile metal with very high thermal and electrical conductivity. Pure copper is soft and malleable; an exposed surface has a reddish-orange tarnish...

, zinc

Zinc

Zinc , or spelter , is a metallic chemical element; it has the symbol Zn and atomic number 30. It is the first element in group 12 of the periodic table. Zinc is, in some respects, chemically similar to magnesium, because its ion is of similar size and its only common oxidation state is +2...

, nickel

Nickel

Nickel is a chemical element with the chemical symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a slight golden tinge. Nickel belongs to the transition metals and is hard and ductile...

, lead

Lead

Lead is a main-group element in the carbon group with the symbol Pb and atomic number 82. Lead is a soft, malleable poor metal. It is also counted as one of the heavy metals. Metallic lead has a bluish-white color after being freshly cut, but it soon tarnishes to a dull grayish color when exposed...

, cadmium

Cadmium

Cadmium is a chemical element with the symbol Cd and atomic number 48. This soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. Similar to zinc, it prefers oxidation state +2 in most of its compounds and similar to mercury it shows a low...

, and Manganese

Manganese

Manganese is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature , and in many minerals...

; while the southern part of the lake show high levels of Chromium

Chromium

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is the first element in Group 6. It is a steely-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odorless, tasteless, and malleable...

 in deeper sediments (20–22 cm). Overall, levels of heavy metals

Heavy metals

A heavy metal is a member of a loosely-defined subset of elements that exhibit metallic properties. It mainly includes the transition metals, some metalloids, lanthanides, and actinides. Many different definitions have been proposed—some based on density, some on atomic number or atomic weight,...

 are considered moderate.

Flora and fauna

In 1998, a wide range of aquatic plants were documented in the lake: Weed

Phragmites

Phragmites, the Common reed, is a large perennial grass found in wetlands throughout temperate and tropical regions of the world. Phragmites australis is sometimes regarded as the sole species of the genus Phragmites, though some botanists divide Phragmites australis into three or four species...

, Common Club-rush, Common Bulrush

Typha latifolia

Typha latifolia is a perennial herbaceous plant in the genus Typha. It is found as a native plant species in North and South America, Europe, Eurasia, and Africa...

, Lesser Bulrush

Typha angustifolia

Typha angustifolia L., , is a perennial herbaceous plant of genus Typha. This cattail is an "obligate wetland" species that is commonly found in the northern hemisphere in brackish locations...

, Yellow Iris

Iris pseudacorus

Iris pseudacorus is a species of Iris, native to Europe, western Asia and northwest Africa. Common names include yellow iris and yellow flag...

, Alisma

Alisma

Alisma is a genus of flowering plants in the family Alismataceae, members of which are commonly known as water-plantains. The genus consists of aquatic plants with leaves either floating or submerged, found in a variety of still water habitats around the world . The flowers are hermaphrodite, and...

, Branched Bur-reed

Sparganium

Sparganium is a genus of flowering plants, containing about 20 species in temperate regions of both the Northern and Southern Hemispheres. It was previously placed alone in the family Sparganiaceae...

, Water Hemlock

Cicuta virosa

Cicuta virosa is a species of Cicuta, native to northern and central Europe, northern Asia and northwestern North America. It is a perennial herbaceous plant which grows up to 1–2 m tall. The stems are smooth, branching, swollen at the base, purple-striped, and hollow except for partitions at the...

, Marsh Calla

Calla

Calla is a genus of flowering plant in the family Araceae, containing the single species Calla palustris...

, Water-soldier

Stratiotes

Stratiotes is a genus of submerged aquatic plant commonly known as water soldiers. A characteristic of the genus is the habit of the plants rising to the surface at flowering time.-Description:...

, Yellow Water-lily

Nuphar lutea

Nuphar lutea is an aquatic plant of the family Nymphaeaceae, native to temperate regions of Europe, northwest Africa, and western Asia.-Growth:...

, White Water-lily

Nymphaea alba

Nymphaea alba, also known as the European White Waterlily, White Lotus, or Nenuphar, is an aquatic flowering plant of the family Nymphaeaceae....

, Broad-leaved Pondweed

Potamogeton

Potamogeton is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed...

, Blunt-leaved Pondweed

Potamogeton

Potamogeton is a genus of aquatic, mostly freshwater, plants of the family Potamogetonaceae. Most are known by the common name pondweed, although many unrelated plants may be called pondweed, such as Canadian pondweed...

, Whorled Water-milfoil, Rigid Hornwort

Ceratophyllum demersum

Ceratophyllum demersum is a species of Ceratophyllum. It is a submerged, free-floating aquatic plant, native to North America but nowadays having a cosmopolitan distribution in temperate and tropical regions...

, Common Bladderwort

Utricularia vulgaris

Utricularia vulgaris is an aquatic species of bladderwort found in Asia and Europe. The plant is a free-floating and does not put down roots. Stems can attain lengths of over one metre in a single growing season, but die back and form turions in winter...

, Pondweed, Bog-bean

Menyanthes

Menyanthes is a monotypic genus of flowering plant in the family Menyanthaceae containing the single species Menyanthes trifoliata...

, Frogbit

Hydrocharis morsus-ranae

Hydrocharis morsus-ranae, Frogbit, is a flowering plant belonging to the genus Hydrocharis in the family Hydrocharitaceae. In North America, it is referred to as Common Frogbit or European Frogbit to distinguish it from the related American Frogbit .It is a small floating plant resembling a small...

, Lesser Duckweed

Lemna minor

Lemna minor is a species of Lemna with a subcosmopolitan distribution, native throughout most of Africa, Asia, Europe and North America, occurring everywhere that freshwater ponds and slow-moving streams occur, except for arctic and subarctic climates...

, Greater Duckweed, and Ivy-leaved Duckweed

Lemna trisulca

Lemna trisulca L. is a species of aquatic plants in the genus Lemna with a subcosmopolitan distribution, occurring in quiet freshwater habitats in cool temperate regions. L. trisulca normally doesn't occur in warm temperate regions...

.

Common fishes in the lake includes Pike

Northern Pike

The northern pike , is a species of carnivorous fish of the genus Esox...

, Roach

Rutilus

Rutilus is a genus of fishes in the family Cyprinidae, commonly called roaches. Locally, the name "roach" without any further qualifiers is also used for particular species, particularly the Common Roach Rutilus (Latin for "shining, red, golden, auburn") is a genus of fishes in the family...

, Rudd

Rudd

The common rudd Scardinius erythropthalmus is a bentho-pelagic freshwater fish, widely spread in Europe and middle Asia, around the basins of the North, Baltic, Black, Caspian and Aral seas.-Artificially introduced:...

, Tench

Tench

The tench or doctor fish is a freshwater and brackish water fish of the cyprinid family found throughout Eurasia from Western Europe including the British Isles east into Asia as far as the Ob and Yenisei Rivers. It is also found in Lake Baikal...

, Bleak

Bleak

The common bleak is a small pelagic fish of the Cyprinid family. It is often referred to simply as a "bleak", though this term can refer to any species of Alburnus.-Description:...

, Silver Bream

Silver Bream

The Silver Bream is a species of ray-finned fish in the Cyprinidae family.-Locations:It is found in Albania, Andorra, Armenia, Austria, Azerbaijan, Belarus, Belgium, Bulgaria, Cyprus, Czech Republic, Estonia, Faroe Islands, Finland, France, Georgia, Germany, Gibraltar, Hungary, Iceland, Iran,...

, Carp Bream

Carp bream

The common bream, freshwater bream, bream, bronze bream or carp bream, Abramis brama, is a European species of freshwater fish in the family Cyprinidae....

, Crucian Carp

Crucian carp

The crucian carp is a member of the family Cyprinidae, which includes many other fish, such as the common carp, or the smaller minnows. They inhabit lakes, ponds, and slow-moving rivers throughout Europe and Asia. The crucian is a medium-sized cyprinid, which rarely exceeds a weight of over 3.3...

, Perch

European perch

The European perch, Perca fluviatilis, is a predatory species of perch found in Europe and Asia. In some areas it is known as the redfin perch or English perch, and it is often known simply as perch. The species is a popular quarry for anglers and has been widely introduced beyond its native area,...

, and Ruffe

Ruffe

The Eurasian Ruffe or simply Ruffe is a freshwater fish found in temperate regions of Europe and northern Asia. It has been introduced into the Great Lakes of North America, reportedly with unfortunate results...

. Of these Tench and Crucian carp represents the majority of biomass in the lake, while roach and Perch dominated in numbers. Large fishes dominate in the lake, which is considered as a sign of presence of carnivores. A considerable variation in sizes of Roaches indicates the lake is an important brreding locale for this species. In contrast, Perches show a small variation in scale, which is a sign of the lake being dominated by a single generation as individuals fail to reach carnivorous adulthood.

Some 240 bird species have been reported by the lake, which is an important locale for both resting and breeding species. The lake is dominated by some 500 couples of Black-headed Gull

Black-headed Gull

The Black-headed Gull is a small gull which breeds in much of Europe and Asia, and also in coastal eastern Canada. Most of the population is migratory, wintering further south, but some birds in the milder westernmost areas of Europe are resident...

s together with Mallard

Mallard

The Mallard , or Wild Duck , is a dabbling duck which breeds throughout the temperate and subtropical Americas, Europe, Asia, and North Africa, and has been introduced to New Zealand and Australia....

s and Coots

Eurasian Coot

The Eurasian Coot, Fulica atra, also known as Coot, is a member of the rail and crake bird family, the Rallidae. The Australian subspecies is known as the Australian Coot.-Distribution:...

.
5 couples of Great Crested Grebe

Great Crested Grebe

The Great Crested Grebe is a member of the grebe family of water birds.- Description :The Great Crested Grebe is long with a wingspan. It is an excellent swimmer and diver, and pursues its fish prey underwater. The adults are unmistakable in summer with head and neck decorations...

, 5-10 couples of Teal

Common Teal

The Eurasian Teal or Common Teal is a common and widespread duck which breeds in temperate Eurasia and migrates south in winter. The Eurasian Teal is often called simply the Teal due to being the only one of these small dabbling ducks in much of its range...

 and Goldeneye

Common Goldeneye

The Common Goldeneye is a medium-sized sea duck of the genus Bucephala, the goldeneyes. Their closest relative is the similar Barrow's Goldeneye....

, 5 couples of Tufted Duck

Tufted Duck

The Tufted Duck, Aythya fuligula, is a medium-sized diving duck with a population of close to one million birds.- Description :The adult male is all black except for white flanks and a blue-grey bill. It has an obvious head tuft that gives the species its name.The adult female is brown with paler...

 and Pochard, a few couples of Moorhen

Common Moorhen

The Common Moorhen is a bird in the Rallidae family with an almost worldwide distribution. The North and South American Committees of the AOU and the IOC have voted on or before July 2011 to split the American forms into a new species Common Gallinule, however, no other committee has voted to...

 and Water Rail

Water Rail

The Water Rail is a bird of the rail family which breeds in well-vegetated wetlands across Europe, Asia and North Africa. Northern and eastern populations are migratory, but this species is a permanent resident in the warmer parts of its breeding range...

, and single couples of Shoveler

Northern Shoveler

The Northern Shoveler , Northern Shoveller in British English, sometimes known simply as the Shoveler, is a common and widespread duck. It breeds in northern areas of Europe and Asia and across most of North America, and is a rare vagrant to Australia...

, Gadwall

Gadwall

The Gadwall is a common and widespread duck of the family Anatidae.- Description :The Gadwall is 46–56 cm long with a 78–90 cm wingspan. The male is slightly larger than the female, weighing on average 990 g against her 850 g...

, Garganey

Garganey

The Garganey is a small dabbling duck. It breeds in much of Europe and western Asia, but is strictly migratory, with the entire population moving to southern Africa, India Santragachi and Australasia in winter, where large flocks can occur. This species was first described by Linnaeus in 1758...

. A presence of Whooper Swan

Whooper Swan

The Whooper Swan , Cygnus cygnus, is a large Northern Hemisphere swan. It is the Eurasian counterpart of the North American Trumpeter Swan. An old name for the Whooper Swan is Elk; it is so called in Francis Willughby and John Ray's Ornithology of 1676.-Description:The Whooper Swan is similar in...

 dates back to 2004, while regular visitors include Marsh Harrier

Marsh harrier

The marsh harriers are birds of prey of the harrier subfamily. They are medium-sized raptors and the largest and broadest-winged harriers. Most of them are associated with marshland and dense reedbeds...

 (2-3 couples), Snipe

Common Snipe

The Common Snipe is a small, stocky wader native to the Old World. The breeding habitat is marshes, bogs, tundra and wet meadows throughout northern Europe and northern Asia...

, and Eurasian Woodcock

Eurasian Woodcock

The Eurasian Woodcock, Scolopax rusticola, is a medium-small wading bird found in temperate and subarctic Eurasia. It has cryptic camouflage to suit its woodland habitat, with reddish-brown upperparts and buff-coloured underparts...

. Occasionally Eurasian Bittern and Spotted Crake

Spotted Crake

The Spotted Crake is a small waterbird, of the family Rallidae.Their breeding habitat is marshes and sedge beds across temperate Europe into western Asia. They nest in a dry location in marsh vegetation, laying 6-15 eggs...

 is seen by the lake.

There are a dozen couples of Northern Lapwing

Northern Lapwing

The Northern Lapwing , also known as the Peewit, Green Plover or just Lapwing, is a bird in the plover family. It is common through temperate Eurasia....

 and Eastern Yellow Wagtail, together with couples of Meadow Pipit

Meadow Pipit

The Meadow Pipit Anthus pratensis, is a small passerine bird which breeds in much of the northern half of Europe and also northwestern Asia, from southeastern Greenland and Iceland east to just east of the Ural Mountains in Russia, and south to central France and Romania; there is also an isolated...

, Whinchat

Whinchat

The Whinchat Saxicola rubetra is a small migratory passerine bird breeding in Europe and western Asia and wintering in Africa.Its scientific name means "small rock-dweller", in reference to its habitat...

, Red-backed Shrike

Red-backed Shrike

The Red-backed Shrike is a carnivorous passerine bird and member of the shrike family Laniidae.English common names include 'Wariangle' and 'worrier'.-Description:...

, Bearded Reedling, Goshawk, Spotted Nutcracker

Spotted Nutcracker

The Spotted Nutcracker, Eurasian Nutcracker, or just Nutcracker, is a passerine bird slightly larger than the Eurasian Jay. It has a much larger bill and a slimmer looking head without any crest. The feathering over its body is predominantly a chocolate brown with distinct white spots and streaks...

, Eurasian Wryneck

Eurasian Wryneck

The Eurasian Wryneck, Jynx torquilla, is a species of wryneck in the family of woodpeckers.This species breeds in temperate regions of Europe and Asia. It is migratory, wintering in tropical Africa and southern Asia. It is a bird of open woodland and orchards...

, Honey Buzzard

Honey Buzzard

The European Honey Buzzard , is a bird of prey in the family Accipitridae which also includes many other diurnal raptors such as kites, eagles and harriers....

, Thrush Nightingale

Thrush Nightingale

The Thrush Nightingale, Luscinia luscinia , is a small passerine bird that was formerly classed as a member of the thrush family Turdidae, but is now more generally considered to be an Old World flycatcher, Muscicapidae...

, Long-tailed Tit

Long-tailed Tit

The Long-tailed Tit or Long-tailed Bushtit is a common bird found throughout Europe and Asia. There are several extensive accounts of this species, most notably Cramp and Perrins, 1993; Gaston, 1973; and Harrap and Quinn, 1996...

, Lesser Spotted Woodpecker

Lesser Spotted Woodpecker

The Lesser Spotted Woodpecker is a member of the woodpecker family Picidae. It is assigned to the genus Dendrocopos ....

, Wood Warbler

Wood Warbler

The Wood Warbler is a common and widespread leaf warbler which breeds throughout northern and temperate Europe, and just into the extreme west of Asia in the southern Ural Mountains...

, Hawfinch

Hawfinch

The Hawfinch, Coccothraustes coccothraustes, is a passerine bird in the finch family Fringillidae. Its closest living relatives are the Evening Grosbeak from North America and the Hooded Grosbeak from Central America especially Mexico.This bird breeds across Europe and temperate Asia...

, Eurasian Hobby

Eurasian Hobby

The Eurasian Hobby , or just simply Hobby, is a small slim falcon. It belongs to a rather close-knit group of similar falcons often considered a subgenus Hypotriorchis.-Description:...

, In night time Sedge Warbler

Sedge Warbler

The Sedge Warbler is an Old World warbler in the genus Acrocephalus. It is a medium-sized warbler with a brown, streaked back and wings and a distinct pale supercilium. Sedge Warblers are migratory, crossing the Sahara to get from their European and Asian breeding grounds to spend winter in Africa...

 and Reed Warbler

Reed Warbler

The Eurasian Reed Warbler, or just Reed Warbler, Acrocephalus scirpaceus, is an Old World warbler in the genus Acrocephalus. It breeds across Europe into temperate western Asia. It is migratory, wintering in sub-Saharan Africa....

 are regularly heard, while Grasshopper Warbler

Grasshopper Warbler

The Grasshopper Warbler, Locustella naevia, is an Old World warbler in the grass warbler genus Locustella. It breeds across much of temperate Europe and Asia. It is migratory, wintering from northwest Africa to India....

, River Warbler

River Warbler

The River Warbler, Locustella fluviatilis, is an Old World warbler in the grass warbler genus Locustella. It breeds in east and central Europe into western Asia. It is migratory, wintering in east Africa....

, Marsh Warbler

Marsh Warbler

The Marsh Warbler, Acrocephalus palustris, is an Old World warbler currently classified in the family Acrocephalidae. It breeds in temperate Europe and western Asia and winters mainly in south east Africa...

, and Great Reed Warbler

Great Reed Warbler

The Great Reed Warbler, Acrocephalus arundinaceus, is an Eurasiaan songbird in the genus Acrocephalus. It used to be placed in the "Old World warbler" assemblage, but nowadays is recognized to be part of the marsh- and tree-warbler family .-Description:This is a large thrush-sized warbler,...

 are reported now and then. Osprey

Osprey

The Osprey , sometimes known as the sea hawk or fish eagle, is a diurnal, fish-eating bird of prey. It is a large raptor, reaching more than in length and across the wings...

 is regularly seen fishing in the lake. Uncountable numbers of resting species are reported by the lake, including various swan

Swan

Swans, genus Cygnus, are birds of the family Anatidae, which also includes geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae where they form the tribe Cygnini. Sometimes, they are considered a distinct subfamily, Cygninae...

s, hawks

Buteoninae

Buteoninae is a bird of prey subfamily which consists of medium to large broad-winged species.They have large powerful hooked beaks for tearing flesh from their prey, strong legs and powerful talons...

, eagle

Eagle

Eagles are members of the bird family Accipitridae, and belong to several genera which are not necessarily closely related to each other. Most of the more than 60 species occur in Eurasia and Africa. Outside this area, just two species can be found in the United States and Canada, nine more in...

s, cormorant

Cormorant

The bird family Phalacrocoracidae is represented by some 40 species of cormorants and shags. Several different classifications of the family have been proposed recently, and the number of genera is disputed.- Names :...

s, and sparrow

Sparrow

The sparrows are a family of small passerine birds, Passeridae. They are also known as true sparrows, or Old World sparrows, names also used for a genus of the family, Passer...

s.

Both the lakes upstream and downstream suffered of crayfish plague

Crayfish plague

Crayfish plague, Aphanomyces astaci, is a water mould that infects crayfish, most notably the European Astacus which dies within a few weeks of being infected...

 in the late 1970s, which makes it likely Ågestasjön was affected too. As signal crayfish

Signal crayfish

The signal crayfish, Pacifastacus leniusculus, is a North American species of crayfish. It was introduced to Europe in the 1960s to supplement the Scandinavian Astacus astacus fisheries, which were being damaged by crayfish plague, but the imports turned out to be a carrier of that disease...

 was introduced in the neighbouring lakes recently, it is assumed they are also present in Ågestasjön. Amphibian

Amphibian

Amphibians , are a class of vertebrate animals including animals such as toads, frogs, caecilians, and salamanders. They are characterized as non-amniote ectothermic tetrapods...

s are represented by Moor Frog

Moor Frog

The Moor Frog is a slim, reddish-brown, semi-aquatic amphibian native to Europe and Asia. It is a member of the family Ranidae, or "true frogs".-Taxonomy:...

, Common Frog

Common Frog

The Common Frog, Rana temporaria also known as the European Common Frog or European Common Brown Frog is found throughout much of Europe as far north as well north of the Arctic Circle in Scandinavia and as far east as the Urals, except for most of Iberia, southern Italy, and the southern Balkans...

, True toad

True toad

Bufonidae is the family of the true toads, members of the order Anura . They are the only family of anurans all members of which are known as "toads." The bufonids now comprise more than 35 genera, Bufo being the most widespread and well known.-Characteristics:True toads are widespread and occur...

, and Smooth Newt

Smooth Newt

The Smooth Newt, also known as the Common Newt, Lissotriton vulgaris is the most common newt species of the Lissotriton genus of amphibians. L...

. There are several bat

Bat

Bats are mammals of the order Chiroptera "hand" and pteron "wing") whose forelimbs form webbed wings, making them the only mammals naturally capable of true and sustained flight. By contrast, other mammals said to fly, such as flying squirrels, gliding possums, and colugos, glide rather than fly,...

s present by the lack: Northern Bat

Northern Bat

The Northern Bat is a species of bat. An adult Northern Bat has a body length of 4.9-6.6 cm, a tail of 3.2-5.1 cm, and a wing length of 4.1-5.1 cm. The species is found across Europe and Asia, from England to Hokkaidō and south to northern India.-References: 2006 IUCN Red List of Threatened...

, Daubenton's Bat

Daubenton's bat

Daubenton's Bat, Myotis daubentonii, is a Eurasian bat with quite short ears. It ranges from Britain to Japan and is considered to be increasing its numbers in many areas.The name commemorates the French naturalist Louis-Jean-Marie Daubenton....

, Common Noctule

Common Noctule

The Common Noctule is a species of bat common throughout Europe, Asia, and North Africa. The UK distribution can be found on the National Biodiversity Network website ....

, Whiskered Bat

Whiskered bat

The whiskered bats Myotis mystacinus and related species, are small European bats with long fur. Although uncommon, M. mystacinus is often found around human habitation and around water; it is similar to Brandt's bat Myotis brandtii, from which it was distinguished as a separate species only in...

. Otter

Otter

The Otters are twelve species of semi-aquatic mammals which feed on fish and shellfish, and also other invertebrates, amphibians, birds and small mammals....

s were present in the lake until the 1960s, and were spotted nearby in 2003.

External links

(An introduction to nature reserves in Huddinge Municipality.)