Interactions of water levels with water quality, endemic waterbirds, and invasive species in a shallow, tropical pond

Mayer, Tim; Pilson, Stephen L.

doi:10.1007/s10750-017-3401-2

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…Salinity is an important factor influencing biotic and abiotic structure and processes in aquatic ecosystems (Segal et al, 2006;Jordan et al, 2008;Telesh and Khlebovich, 2010;Shadrin, 2018;Mayer and Pilson, 2019). The salinity changes lead to transformations of taxonomic composition in marine and continental waters.…”

Section: Introductionmentioning

confidence: 99%

Do separated taxa react differently to a long-term salinity increase? The meiobenthos changes in Bay Sivash, largest hypersaline lagoon worldwide

Shadrin¹,

Колесникова²,

Revkova³

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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In the world's largest hypersaline lagoon Bay Sivash, its ecosystem twice transformed from a previous state to a new one due to human intervention. Before the North Crimean Canal construction, it was hypersaline (average salinity of 140 g l−1). The canal was built between 1963 and 1975, which resulted in intensive development of irrigated agriculture discharging drainage water into the bay. Between 1988 and 2013, salinity gradually dropped to average of 18–23 g l−1; a new ecosystem with a different biotic composition formed. In April 2014, the supply of Dnieper water into the North Crimean Canal ceased. This resulted in a gradual salinity increase in the bay to an average of 52 g l−1 in 2015. The start of second ecosystem shift was observed in 2015. In 2018, TSS, DOM and meiobenthos were studied in a salinity gradient from 30 to 88 g l−1. There was an increase in TSS and DOM with increasing salinity. The meiobenthos structure was significantly different in the bottom community and floating mats of filamentous green algae. No correlation was recorded between the number of meiobenthic macrotaxa in the sample and salinity. From 2013 to 2018, changes were seen in the taxocene structure of Nematoda and Harpacticoida. Changes in Nematoda were more dramatic and prolonged than in Harpacticoida. The structure of the Harpacticoida and Ostracoda taxocenes are less variable and more stable than that of the Nematoda taxocene. One of the reasons may be more mobility of Harpacticoida/Ostracoda than Nematoda and/or better osmoadaptation mechanisms.

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Section: Introductionmentioning

confidence: 99%

Do separated taxa react differently to a long-term salinity increase? The meiobenthos changes in Bay Sivash, largest hypersaline lagoon worldwide

Shadrin¹,

Колесникова²,

Revkova³

et al. 2019

Knowl. Manag. Aquat. Ecosyst.

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show abstract

“…Two contributions in the proceedings address the potentially important effect of hydrology on ecosystem interactions in shallow lakes. Mayer & Pilson (2019) present information on the effects of water-level fluctuations on endemic waterbirds in Hawaii, with their results suggesting that these birds prefer to feed at low water levels because these help to concentrate fish and other prey, leading to an increase in feeding rates. Menezes et al (2019) studied differences in food webs and trophic states of semi-arid and humid lakes that lie next to each other in the Natal region of Brazil, with a focus on evaporation ratios; they concluded that catchment area-to-lake area ratio, nutrient concentrations, and abundances of plankton and fish were higher in semiarid areas, whereas inlet water-to-evaporation ratio, water transparency, and macrophyte coverage were higher than those in humid areas.…”

mentioning

confidence: 98%

Preface: Shallow lakes research: advances and perspectives

Nandini

May

2018

Hydrobiologia

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“…Researchers have shown that tilling increases macroinvertebrate abundance and creates preferred foraging habitat for the Hawaiian Stilt and other endemic waterbirds (Chang 1990; Rader 2005; Wirwa 2007). Water level manipulation also has the potential to improve prey access for Hawaiian Stilts—shallow water decreases foraging costs by making prey more visible and more concentrated (Gawlik 2002; Mayer and Pilson 2019). According to Kaminsky and Prince's work (1981), hemi-marsh conditions (a patchy, 1:1 ratio of open water to vegetation) were optimal for dabbling ducks, as they provide varied habitat as well as consistently high populations of macroinvertebrates.…”

mentioning

confidence: 99%

Foraging Behavior of the Hawaiian Stilt (Himantopus mexicanus knudseni) at Hāmākua Marsh, O'ahu, Hawai'i

Jensen,

Liang,

Works

2023

Waterbirds

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Understanding habitat use on a fine scale is essential for the development of management plans for threatened and endangered species. Several heavily managed State Wildlife Sanctuaries and National Wildlife Refuges provide critical foraging habitat for the endangered Hawaiian Stilt, or Aeʻo (Himantopus mexicanus knudseni). The foraging behavior and habitat use of Hawaiian Stilts at Hāmākua Marsh State Wildlife Sanctuary, Oʻahu, Hawaiʻi was investigated. Foraging tactics, success, and microhabitat were recorded for 227 birds over 24 2-hr periods from September to December 2021. Hawaiian Stilts made the most foraging attempts in shallow (< 8 cm deep) water, and had the most success in intermediate (8-15 cm deep) water. The most commonly recorded foraging tactic was pecking, while the most successful was plunging. Visual tactics were both more common and more successful than tactile. The overall foraging success rate for Hawaiian Stilts in this study was 0.16, markedly less than success rates observed by other researchers in related species. It is possible that prey in Hāmākua Marsh is either less abundant or less vulnerable to capture than in other similar habitats. Our results suggest that future habitat management for Hawaiian Stilts should prioritize areas of shallow water and further investigate food availability.

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Interactions of water levels with water quality, endemic waterbirds, and invasive species in a shallow, tropical pond

Cited by 7 publications

References 32 publications

Do separated taxa react differently to a long-term salinity increase? The meiobenthos changes in Bay Sivash, largest hypersaline lagoon worldwide

Do separated taxa react differently to a long-term salinity increase? The meiobenthos changes in Bay Sivash, largest hypersaline lagoon worldwide

Preface: Shallow lakes research: advances and perspectives

Foraging Behavior of the Hawaiian Stilt (Himantopus mexicanus knudseni) at Hāmākua Marsh, O'ahu, Hawai'i

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