71
of the world population of this species (Greig-Smith 1994). This upshot in the UK
led to restrictions of the use of carbofenothion and replacement by chlorfenvinphos;
however, chlorfenvinphos poses a greater risk to pigeon than to geese. The increased
mortality of pigeon leads to replacement of chlorfenvinphos by fonofos during the
middle of 1980s (Greig-Smith 1994).
A study to discover out the prime factors for grassland bird declines in Europe
and North America based on the data for 23-year period (from 1980 to 2003) was
organized by the toxicologist Pierre Mineau and others (Mineau and Whiteside
2013). The study analyses the five potential sources of grassland bird decrement
besides fatal pesticide menaces. These are change in agricultural farming such as
hay or alfalfa production, farming intensity, or the percentage of actively cropped
agricultural pasture, the use of herbicides and insecticide, and change in permanent
pasture and rangeland. This study recognizes that the foremost cause of the extensive decline in grassland bird numbers in the USA is acutely toxic pesticides and
focuses on the degree to which lethal pesticides, like organophosphates and carbamates, are accountable for the decrement in grassland bird populations. This finding
challenges the most likely assumption that change in crop pasture, the chief factor
for habitat loss, was the primary cause of those population declines (Mineau and
Whiteside 2013).
Pesticides are recognized as one of the cause of the frequent declines of species
of Neotropical migrants. From a report of American Bird Conservancy (2009),
among the 341 species of Neotropical migrants (includes plovers, terns, hawks,
cranes, warblers, and sparrows), 127 bird species were known to decline. Sixty species were in severe decline mode (population decrease of 45% or more), of which
29 were different species of songbird. Due to destruction of natural swampland and
grasslands (Knopf 1994; Skagen 2006), shorebirds are enforced to inhabit alternative places like paddy fields and turf grass farms as migratory stopover during their
annual journey between breeding and non-breeding territory (Twedt et al. 1998;
Corder 2005; Blanco et al. 2006; Robbins 2007). Although application of highly
toxic organophosphate and carbamates is regulated in many countries, less toxic
organophosphate and carbamate compounds are still recommended to be used in
agriculture for controlling pest of the crops including rice and turf grass in various
countries of North and South America (Merchant 2005; Blanco et al. 2006; Way and
Cockrell 2007). Poisoning of migratory birds in South America has been documented to potential exposure to cholinesterase arresters while utilizing resources in
agricultural habitats (Goldstein et al. 1999). Feet of dead birds may be used to monitor the short- and long-term external (dermal) exposure to pesticides beside the
traditional method using chemical analysis of pesticide present in the gastrointestinal tract, liver, eggs, and muscle (Alharbi et al. 2016). In addition to mortality (Pain
et al. 2004; Wobeser et al. 2004; Renfrew et al. 2006), sublethal exposure to organophosphate and carbamates can elicit a number of behavioural changes such as loss
of migratory orientation and slower flight speed due to obstruction in physiological
process (Vyas et al. 1995; Grue et al. 1997; Brasel et al. 2005).
Migrants belonging to Nearctic-Neotropical shorebird can be categorized into
upland and wetland shorebirds depending on their habitat requirements. Upland
3 Toxic Effects of Pesticides on Avian Fauna
of the world population of this species (Greig-Smith 1994). This upshot in the UK
led to restrictions of the use of carbofenothion and replacement by chlorfenvinphos;
however, chlorfenvinphos poses a greater risk to pigeon than to geese. The increased
mortality of pigeon leads to replacement of chlorfenvinphos by fonofos during the
middle of 1980s (Greig-Smith 1994).
A study to discover out the prime factors for grassland bird declines in Europe
and North America based on the data for 23-year period (from 1980 to 2003) was
organized by the toxicologist Pierre Mineau and others (Mineau and Whiteside
2013). The study analyses the five potential sources of grassland bird decrement
besides fatal pesticide menaces. These are change in agricultural farming such as
hay or alfalfa production, farming intensity, or the percentage of actively cropped
agricultural pasture, the use of herbicides and insecticide, and change in permanent
pasture and rangeland. This study recognizes that the foremost cause of the extensive decline in grassland bird numbers in the USA is acutely toxic pesticides and
focuses on the degree to which lethal pesticides, like organophosphates and carbamates, are accountable for the decrement in grassland bird populations. This finding
challenges the most likely assumption that change in crop pasture, the chief factor
for habitat loss, was the primary cause of those population declines (Mineau and
Whiteside 2013).
Pesticides are recognized as one of the cause of the frequent declines of species
of Neotropical migrants. From a report of American Bird Conservancy (2009),
among the 341 species of Neotropical migrants (includes plovers, terns, hawks,
cranes, warblers, and sparrows), 127 bird species were known to decline. Sixty species were in severe decline mode (population decrease of 45% or more), of which
29 were different species of songbird. Due to destruction of natural swampland and
grasslands (Knopf 1994; Skagen 2006), shorebirds are enforced to inhabit alternative places like paddy fields and turf grass farms as migratory stopover during their
annual journey between breeding and non-breeding territory (Twedt et al. 1998;
Corder 2005; Blanco et al. 2006; Robbins 2007). Although application of highly
toxic organophosphate and carbamates is regulated in many countries, less toxic
organophosphate and carbamate compounds are still recommended to be used in
agriculture for controlling pest of the crops including rice and turf grass in various
countries of North and South America (Merchant 2005; Blanco et al. 2006; Way and
Cockrell 2007). Poisoning of migratory birds in South America has been documented to potential exposure to cholinesterase arresters while utilizing resources in
agricultural habitats (Goldstein et al. 1999). Feet of dead birds may be used to monitor the short- and long-term external (dermal) exposure to pesticides beside the
traditional method using chemical analysis of pesticide present in the gastrointestinal tract, liver, eggs, and muscle (Alharbi et al. 2016). In addition to mortality (Pain
et al. 2004; Wobeser et al. 2004; Renfrew et al. 2006), sublethal exposure to organophosphate and carbamates can elicit a number of behavioural changes such as loss
of migratory orientation and slower flight speed due to obstruction in physiological
process (Vyas et al. 1995; Grue et al. 1997; Brasel et al. 2005).
Migrants belonging to Nearctic-Neotropical shorebird can be categorized into
upland and wetland shorebirds depending on their habitat requirements. Upland
3 Toxic Effects of Pesticides on Avian Fauna