The relationship of sand moisture to burrowing depth of the sand-beach isopod tylos punctatus Holmes and Gay

Holanov, Stephen H.; Hendrickson, John

doi:10.1016/0022-0981(80)90093-3

Cited by 17 publications

(4 citation statements)

References 9 publications

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“…Long distance terrestrial dispersal is also limited. During the day, these isopods remain inactive and buried in the sand near the previous high tide mark; which protects them from high temperatures, desiccation, predation, and dislodgement by waves [3], [28], [29]. At night, they emerge to the intertidal portion of the sand that is not submerged, where they forage on detritus and algae.…”

Section: Introductionmentioning

confidence: 99%

Contrasting Phylogeography of Sandy vs. Rocky Supralittoral Isopods in the Megadiverse and Geologically Dynamic Gulf of California and Adjacent Areas

2013

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Phylogeographic studies of animals with low vagility and restricted to patchy habitats of the supralittoral zone, can uncover unknown diversity and shed light on processes that shaped evolution along a continent’s edge. The Pacific coast between southern California and central Mexico, including the megadiverse Gulf of California, offers a remarkable setting to study biological diversification in the supralittoral. A complex geological history coupled with cyclical fluctuations in temperature and sea level provided ample opportunities for diversification of supralittoral organisms. Indeed, a previous phylogeographic study of Ligia, a supralittoral isopod that has limited dispersal abilities and is restricted to rocky patches, revealed high levels of morphologically cryptic diversity. Herein, we examined phylogeographic patterns of Tylos, another supralittoral isopod with limited dispersal potential, but whose habitat (i.e., sandy shores) appears to be more extensive and connected than that of Ligia. We conducted Maximum Likelihood and Bayesian phylogenetic analyses on mitochondrial and nuclear DNA sequences. These analyses revealed multiple highly divergent lineages with discrete regional distributions, despite the recognition of a single valid species for this region. A traditional species-diagnostic morphological trait distinguished several of these lineages. The phylogeographic patterns of Tylos inside the Gulf of California show a deep and complex history. In contrast, patterns along the Pacific region between southern California and the Baja Peninsula indicate a recent range expansion, probably postglacial and related to changes in sea surface temperature (SST). In general, the phylogeographic patterns of Tylos differed from those of Ligia. Differences in the extension and connectivity of the habitats occupied by Tylos and Ligia may account for the different degrees of population isolation experienced by these two isopods and their contrasting phylogeographic patterns. Identification of divergent lineages of Tylos in the study area is important for conservation, as some populations are threatened by human activities.

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Section: Introductionmentioning

confidence: 99%

Contrasting Phylogeography of Sandy vs. Rocky Supralittoral Isopods in the Megadiverse and Geologically Dynamic Gulf of California and Adjacent Areas

2013

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“…It seems extremely unlikely that any environmental changes occur at that depth which would indicate emergence-time 1 h after sunset Most burrows, for example, would be dark because they are usually plugged with wind-blown sandorbecause the mouth of the burrow has collapsed as the surface dries after sunrise. The humidity remains close to saturation (Kensley 1974;Holanov & Hendrickson 1980) and temperature changes are gradual and oflow amplitude. Continuous recordings of sand temperature at Garden Bay (Quilter unpubl.…”

Section: Discussionmentioning

confidence: 99%

Clock control of foraging in the isopodScyphax ornatusDana

Quilter

Lewis

1989

New Zealand Journal of Zoology

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The terrestrial sand beach isopodScyphax ornatus Dana exhibits circadian and circa-semilunar activity rhythms when kept in constant conditions in the laboratory. The circadian rhythm restricts activity to the subjective night and can be synchronised to artificial light cycles. The circa-semilunar rhythm is expressed as a cyclic variation in overall activity level, with isopods alternately active on 6-8 consecutive nights and then inactive on the next 6-8 nights. The circa-semilunar rhythm matches a fortnightly cycle in food aVailability on the isopods' home beach, but does not appear to be causally related to the lunar cycle, the spring/neap tidal cycle, or to moulting. This and other evidence suggests that the ecological role of the endogenous circa-semilunar rhythm is to allow Scyphax. within the protection of their burrows, to predict nightly foraging opportunities; a new role for such a long-period rhythm.

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“…Such factors might include: 1. temperature, other climatic variables, and sub-lethal diseases directly affecting patchlevel PCEA (e.g., less callianassid burrowing at lower temperature, Berkenbusch and Rowden, 1999); 2. abiotic environmental factors or predators resulting in engineer alteration of refuge size (e.g., deeper burrows at lower sand moisture, Holanov and Hendrickson, 1980; see Section 8.2 for predators); 3. food accessibility influencing structure created while foraging (e.g., hypothetically for desert porcupines, Alkon, 1999, if plant rooting depth increases with drought, digs might be deeper); and 4. food availability (directly, e.g., callianassids, Berkenbusch and Rowden, 1999; and indirectly via body size effects, as in the ray example above).…”

Section: Structure Per Patchmentioning

confidence: 99%

Ecosystem engineers and geomorphological signatures in landscapes

Jones

2012

Geomorphology

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The relationship of sand moisture to burrowing depth of the sand-beach isopod tylos punctatus Holmes and Gay

Cited by 17 publications

References 9 publications

Contrasting Phylogeography of Sandy vs. Rocky Supralittoral Isopods in the Megadiverse and Geologically Dynamic Gulf of California and Adjacent Areas

Contrasting Phylogeography of Sandy vs. Rocky Supralittoral Isopods in the Megadiverse and Geologically Dynamic Gulf of California and Adjacent Areas

Clock control of foraging in the isopodScyphax ornatusDana

Ecosystem engineers and geomorphological signatures in landscapes

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