A comparison of the ecological effects of two invasive poeciliids and two native fishes: a mesocosm approach

Tsang, Alphonse Hin Fat; Dudgeon, David

doi:10.1007/s10530-020-02455-7

Cited by 7 publications

(8 citation statements)

References 86 publications

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“…However, this is in contrast to our study that showed no significant impact of the sailfin catfish over the abiotic factors of the test mesocosms. Similar results have also been documented for several exotic species (Venturelli & Tonn, 2005;Tsang & Dudgeon, 2021). For example, Tsang & Dudgeon, (2021) assessed the impact of two exotic fish species, mosquitofish and guppy, over population of native fish species, rice fish Oryzias curvinotus and half banded barb Puntius semifasciolatus, invertebrate abundance, and biomass of phytoplankton and periphyton, and several abiotic factors (nitrite, nitrate and ammonia concentration) using a mesocosm approach in Hong Kong, China.…”

Section: Discussionsupporting

confidence: 59%

Ecological assessment of the Amazon sailfin catfish (Pterygoplichthysspecies) within the Indian freshwaters: a mesocosm-based approach

Mallick

Hussan

Sundaray

et al. 2023

Preprint

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Amazon sailfin catfish is relatively a recent invader to the open waters of India, and studies on ecological assessment of the species within the Indian freshwaters are lacking. In the present study, to assess the ecological impact of catfish, we established mesocosms mimicking the Indian freshwaters within natural ponds of eastern India using three species of native fish, rohu, catla and mrigal, and for two size classes, small (10-20 cm length) and large (20-30 cm length) native fishes. Mesocosms were maintained with (test) and without the catfish (control), and length and weight of native fish, zooplankton abundance, and several hydrological and soil parameters were measured at a monthly interval for a period of 120-days. The catfish had a significant (P<0.05) negative impact on growth of small-size rohu only. However, we found no significant (P>0.05) differences in abiotic parameters and zooplankton abundance between control and test ponds for the small-size class. We speculate that reduced growth of rohu could be due to competition from catfish in the context of feeding, and not due to modification of abiotic environment. Thus, we emphasize upon the need for behavioral studies to further assess the impact of the catfish.

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Section: Discussionsupporting

confidence: 59%

Ecological assessment of the Amazon sailfin catfish (Pterygoplichthysspecies) within the Indian freshwaters: a mesocosm-based approach

Mallick

Hussan

Sundaray

et al. 2023

Preprint

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“…A first possible explanation for this notable difference in favor of managing native species is that this wildlife service was traditionally dedicated to this task, while the commitment to controlling introduced species is more recent. Predator eradication with direct federal involvement began in the early 1900s and received direct public funding in 1915 [ 26 , 27 , 28 ]. For decades, lethal control of native wildlife was performed mainly to benefit livestock producers and to enhance game populations [ 29 ].…”

Section: Discussionmentioning

confidence: 99%

“…At least four different methods using different sources of information have been used: searches in the Web of Science [ 22 , 23 ], reviews of the information provided by the IUCN Red List of Endangered species [ 15 ], field experiments [ 25 ] and mesocosms, which allow for the very precise analysis of harmful ecological effects [ 26 ]. The objectives of this work were to compare the impacts of native and introduced species of terrestrial vertebrates in the United States using a new type of information and to discuss the NID hypothesis.…”

Section: Introductionmentioning

confidence: 99%

Human–Wildlife Conflicts: Does Origin Matter?

Cassini¹

2022

Animals

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Conservation biologists have divided wildlife in two antagonist categories—native and introduced populations—because they defend the hypothesis that the latter acquires or expresses harmful qualities that a population that remains in its original environment does not possess. Invasion biology has emerged as a branch of conservation biology dedicated exclusively to conflicts between introduced wildlife and human interest, including the protection of biodiversity. For invasion biology, the damage caused by native species is different and must be managed differently. However, the consensus around this native–introduced dichotomy is not universal, and a debate has intensified in recent years. The objective of this work was to compare the impacts of native and introduced species of terrestrial vertebrates of the United States using the dataset provided by Wildlife Services (WS), which depend upon the Animal and Plant Health Inspection Service of the Department of Agriculture. Annually, they receive thousands of reports and complaints of human–wildlife conflicts. I analyzed the WS databases and found, against expectations, that native species produce significantly more damage than nonnative ones, especially regarding damage to agriculture, property and health and safety. In the category of impacts on biodiversity and natural ecosystems, the differences were minor. I discuss several potential explanations of these patterns in the results. I also discuss the ecological foundations of the native–introduced dichotomy hypothesis.

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“…Nonetheless, management strategies to reduce the spread of exotics are needed. Although poeciliids have no effect on native fish communities in Hong Kong, they have been confirmed to impact local amphibians (Karraker et al., 2010) and invertebrates (Tsang & Dudgeon, 2021a, 2021b). Poeciliids have been reported to impact indigenous fishes elsewhere by means of aggression (e.g.…”

Section: Discussionmentioning

confidence: 99%

Do exotic poeciliids affect the distribution or trophic niche of native fishes? Absence of evidence from Hong Kong streams

Tsang

Dudgeon

2021

Freshwater Biology

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Exotic poeciliids have been reported to reduce abundance and richness of native fishes and, more generally, constrain the trophic niches of native counterparts. However, understanding of the consequences of poeciliids on native fishes in tropical streams is limited. We conducted a survey of lowland streams in Hong Kong during 2018–19 to document the prevalence of poeciliids and look for signs that they had affected the distribution of native fishes. Overall, 31 native and 15 exotic fishes were recorded during the survey. Exotics occurred at 37 out of 45 survey sites, with poeciliids present at 35 sites. Richness of poeciliids or other exotic fishes had no correlation with the number of native species at each site. Moreover, native fish assemblages appeared unaffected by poeciliids, which might reflect a legacy of stream pollution. By comparing nine streams where the presence and composition of poeciliids varied, we investigated whether the mosquitofish (Gambusia affinis) alone, and in combination with the guppy (Poecilia reticulata), swordtail (Xiphophorus hellerii), and variable platy (Xiphophorus variatus), affected the trophic niche of native half‐banded barb (Puntius semifasciolatus: Cyprinidae) which has a similar body size to the poeciliids, as quantified by gut content and stable‐isotope analysis. We also tested whether the trophic niche of the mosquitofish was affected by the three other poeciliids. Gut‐content analysis indicated that the half‐handed barb fed on aquatic invertebrates, while the mosquitofish ate mainly terrestrial insects. The three other poeciliids were predominately primary consumers. The mosquitofish, alone or in combination with other poeciliids, had no detectable effects on the dietary or isotopic niche of the barb, nor was the niche of the mosquitofish influenced by the presence of other poeciliids. Limited dietary overlap and differences in microhabitat use were likely to account for the absence of a detectable niche shift by the barb where poeciliids were present.

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A comparison of the ecological effects of two invasive poeciliids and two native fishes: a mesocosm approach

Cited by 7 publications

References 86 publications

Ecological assessment of the Amazon sailfin catfish (Pterygoplichthysspecies) within the Indian freshwaters: a mesocosm-based approach

Ecological assessment of the Amazon sailfin catfish (Pterygoplichthysspecies) within the Indian freshwaters: a mesocosm-based approach

Human–Wildlife Conflicts: Does Origin Matter?

Do exotic poeciliids affect the distribution or trophic niche of native fishes? Absence of evidence from Hong Kong streams

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