|
:''"Shore crab" redirects here. This may also be used for crabs in the superfamily Grapsoidea.'' ''Carcinus maenas'' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".〔(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= )〕 It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting. ''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''. == Description == ''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.〔 The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「:''"Shore crab" redirects here. This may also be used for crabs in the superfamily Grapsoidea.'''''''Carcinus maenas''''' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= ) It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting.''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''.== Description ==''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults.」の詳細全文を読む :''"Shore crab" redirects here. This may also be used for crabs in the superfamily Grapsoidea.'' ''Carcinus maenas'' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".〔(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= )〕 It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting. ''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''. == Description == ''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.〔 The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults. 抄文引用元・出典: フリー百科事典『 ''''Carcinus maenas''''' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= ) It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting.''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''.== Description ==''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults.">ウィキペディア（Wikipedia）』 ■ウィキペディアで「:''"Shore crab" redirects here. This may also be used for crabs in the superfamily Grapsoidea.'''''''Carcinus maenas''''' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= ) It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting.''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''.== Description ==''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults.」の詳細全文を読む ■''''Carcinus maenas''''' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= ) It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting.''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''.== Description ==''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults.">ウィキペディアで「:''"Shore crab" redirects here. This may also be used for crabs in the superfamily Grapsoidea.'''''''Carcinus maenas''''' is a common littoral crab, and an important invasive species, listed among the 100 "world's worst alien invasive species".(【引用サイトリンク】 url = http://www.issg.org/database/species/search.asp?st=100ss&fr=1&sts= ) It is native to the north-east Atlantic Ocean and Baltic Sea, but has colonised similar habitats in Australia, South Africa, South America and both Atlantic and Pacific coasts of North America. It grows to a carapace width of , and feeds on a variety of molluscs, worms and small crustaceans, potentially impacting a number of fisheries. Its successful dispersion has occurred via a variety of mechanisms, such as on ships' hulls, packing materials, bivalves moved for aquaculture, and rafting.''C. maenas'' is known by different names around the world. In the British Isles, it is generally referred to as the ''shore crab'', or ''green shore crab''. In North America and South Africa, it bears the name ''green crab'' or ''European green crab''. In Australia and New Zealand, it is referred to as either the ''European green crab'' or ''European shore crab''.== Description ==''C. maenas'' has a carapace up to long and wide, but can be larger outside its native range, reaching wide in British Columbia. The carapace has five short teeth along the rim behind each eye, and three undulations between the eyes. The undulations, which protrude beyond the eyes, are the simplest means of distinguishing ''C. maenas'' from the closely related ''C. aestuarii'', which can also be an invasive species. In ''C. aestuarii'', the carapace lacks any bumps and extends forward beyond the eyes. Another characteristic for distinguishing the two species is the form of the first and second pleopods (collectively the gonopods), which are straight and parallel in ''C. aestuarii'', but curve outwards in ''C. maenas''.The colour of ''C. maenas'' varies greatly, from green to brown, grey or red. This variation has a genetic component, but is largely due to local environmental factors. In particular, individuals which delay moulting become red–coloured rather than green. Red individuals are stronger and more aggressive, but are less tolerant of environmental stresses, such as low salinity or hypoxia. Juvenile crabs on average display greater patterning than adults.」の詳細全文を読む スポンサード リンク
|