Species diversity and abundance of freshwater fishes in irrigation ditches around rice fields

Katano, Osamu; Hosoya, Kazumi; Iguchi, Kei’ichiro; Yamaguchi, Motoyoshi; Aonuma, Yoshimasa; Kitano, Satoshi

doi:10.1023/a:1023678401886

Cited by 114 publications

(19 citation statements)

References 22 publications

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“…More permanent waterways were located in PNA, but fields were more exposed to agrochemicals especially during the dry season. Nearby permanent water bodies with abundant fish prey are typically important to explain abundance and diversity of fishes in rice fields, especially if the water quality on rice fields is relatively high (Katano et al 2003;Uchida & Inoue 2010). The presence of barbs in PNA may also partly explain the scarcity of rice fishes.…”

Section: Patterns Of Abundance Of Fishesmentioning

confidence: 99%

Aquatic faunal abundance and diversity in relation to synthetic and natural pesticide applications in rice fields of Central Thailand

Cochard

Maneepitak

Kumar

2014

International Journal of Biodiversity Science, Ecosystem Servic

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Despite wetland conversion to intensive rice production Central Thailand remains a center for wetland biodiversity in Southern Asia. Fauna inhabiting rice fields (many species perform important ecosystem services) are, however, increasingly threatened by pesticide uses. In Ayutthaya and Ang Thong Provinces 40 conventionally and 31 organically managed farms were visited to investigate how abundance and diversity of aquatic fauna in rice fields relate to pesticide regimes. In the dry and wet seasons fields were surveyed for plankton, aquatic macro-invertebrates, fishes, and waterfowl. Using multivariate statistics pesticide variables and biophysical field parameters (determined in a previous study) were assessed as potential predictors of abundance/diversity of faunal groups. Effects of pesticide regimes on aquatic fauna were nontrivial. Phytoplankton was lowered under exposures to herbicides and natural insecticides. Zooplankton (except amoeboids) was unaffected or increased on pesticide-exposed fields, probably suffering lower predation. Biophysical aspects partly explained abundance/diversity of aquatic insects, but abundance/diversity was generally higher on fields treated with natural rather than synthetic insecticides. Fishes and waterfowl tended to be less abundant on fields exposed to synthetic insecticides and herbicides. Detailed findings may interest agro-ecologists, medical entomologists, and conservation biologists. Further research incorporating wider landscape aspects and including pesticide-free reference sites is suggested.

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Section: Patterns Of Abundance Of Fishesmentioning

confidence: 99%

Aquatic faunal abundance and diversity in relation to synthetic and natural pesticide applications in rice fields of Central Thailand

Cochard

Maneepitak

Kumar

2014

International Journal of Biodiversity Science, Ecosystem Servic

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“…The optimal models also suggest that the introduction of non-native bass was positively associated with increasing concrete-covered shoreline. Concrete revetments are generally considered to negatively affect fish species diversity by altering physiological/hydraulic conditions and/or destruction of vegetation cover (e.g., Lane and Fujioka 1998;Katano et al 2003). However, when considering intentional introductions, we propose that concrete-covered shorelines might increase accessibility for humans to access nearby water for delivery of fishes or angling.…”

Section: Discussionmentioning

confidence: 99%

Predicting patterns of intentional introduction of non‐native largemouth bass into farm ponds in northeastern Japan

Tsunoda

Mitsuo

Enari

2014

Ecological Research

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Non‐native species are difficult to eradicate or control once established. Thus, the prevention of invasions is a high priority for conserving native ecosystems. Our objective was to determine the factors that influence illegal introductions of non‐native largemouth bass (Micropterus salmoides) and to develop a model that could be used to predict the pattern of future illegal introduction by anglers. We used generalized linear modeling (GLM) to evaluate the relationship between landscape and environmental factors and the presence of bass in farm ponds. Our results suggest that the occurrence of bass was primarily associated with pond size, distance of ponds from the urban center, and the proportion of the pond shoreline covered with a concrete revetment. We conclude that introductions occurred in ponds that were: easier to locate on a map, closer to anglers’ residential areas, and more easily accessible to the pond shore. Last, we suggest our predictive model could be used for preventive measures, such as identifying other ponds most at risk of future illegal introduction of non‐native bass.

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“…Fishways, which connect rice fields and ditches with large gaps can be effective in successful migration of loach and other fish (Suzuki et al, 2004) because the loss of this connectivity (i.e. large gaps) has a serious impact on abundance and diversity of fish (Katano et al, 2003;Katayama et al, 2011). The installation of fishways seems to be one of the effective conservation measures not only for fish but also for higher order predators including the endangered giant water bug K. deyrolli.…”

Section: Discussionmentioning

confidence: 99%

“…Agricultural modernisation, such as agrochemical application, irrigation management, and farmland consolidation, has caused biodiversity loss in rice-field ecosystems for the last half-century (Natuhara, 2013;Washitani, 2007). For fish that inhabit rice fields for at least part of their life history, differences in water level between rice fields and irrigation ditches caused by the alteration of irrigation systems negatively influence abundance and composition by preventing their access (Katano et al, 2003;Katayama, Saitoh, Amano, & Miyashita, 2011). For example, the pond loach Misgurnus anguillicaudatus uses rice fields as an alternative to floodplains for spawning and growth (Saitoh, Katano, & Koizumi, 1988;Tanaka, 1999), and a water level difference of only 50 cm at the entrance of rice fields prevents the fish from migrating to spawn (Katayama et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of irrigation system alterations on the trophic position of a threatened top predator in rice‐field ecosystems

et al. 2019

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Rice fields serve as alternative habitats for wetland species, and their recent reduction in area due to land conversion is considered one of the main human drivers of wetland biodiversity loss. Even for existing rice fields, physico‐chemical disturbances, such as farmland consolidation and agrochemical application, also have negative effects on wetland biodiversity. For fish that inhabit rice fields for at least part of their life history, differences in water level between rice fields and irrigation ditches caused by irrigation system improvements are critical to their abundance by preventing their access. The ecological impact of differences in water level may extend to the foraging habits and trophic positions of the top predators in rice fields, resulting in the alteration of wetland food webs. Here, we investigated how physical disruptions to habitat networks affect food‐web properties in rice‐field ecosystems. We conducted stable nitrogen and carbon isotope analysis on a threatened giant water bug, Kirkaldyia deyrolli, to estimate its trophic position as an indicator of food‐chain length. Based on field observations, we found that fish that were at a high trophic position were only available to K. deyrolli in rice fields where there were no physical barriers blocking access to the network of habitats, and the diets of K. deyrolli included fish prey (18%, based on visual observation). The stable isotope analysis revealed that the trophic position of K. deyrolli was significantly lower in rice fields with physical barriers (no fish/10 dips by a dip net) than in those without physical barriers (5.6 fish) due to the absence of fish in locations with barriers. In conclusion, our study demonstrates that physical alterations are important to community composition and food‐web properties in rice‐field ecosystems because they can act as barriers to fish.

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Species diversity and abundance of freshwater fishes in irrigation ditches around rice fields

Cited by 114 publications

References 22 publications

Aquatic faunal abundance and diversity in relation to synthetic and natural pesticide applications in rice fields of Central Thailand

Aquatic faunal abundance and diversity in relation to synthetic and natural pesticide applications in rice fields of Central Thailand

Predicting patterns of intentional introduction of non‐native largemouth bass into farm ponds in northeastern Japan

Effects of irrigation system alterations on the trophic position of a threatened top predator in rice‐field ecosystems

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